CN108442915A - Oil well determination of distance method and apparatus - Google Patents
Oil well determination of distance method and apparatus Download PDFInfo
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- CN108442915A CN108442915A CN201810269535.7A CN201810269535A CN108442915A CN 108442915 A CN108442915 A CN 108442915A CN 201810269535 A CN201810269535 A CN 201810269535A CN 108442915 A CN108442915 A CN 108442915A
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- 239000003129 oil well Substances 0.000 title claims abstract description 523
- 238000000034 method Methods 0.000 title claims abstract description 96
- 230000005291 magnetic effect Effects 0.000 claims abstract description 298
- 238000005553 drilling Methods 0.000 claims abstract description 193
- 230000008569 process Effects 0.000 claims abstract description 54
- 230000009466 transformation Effects 0.000 claims description 26
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 238000012512 characterization method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 16
- 238000005259 measurement Methods 0.000 description 16
- 239000003921 oil Substances 0.000 description 11
- 230000005611 electricity Effects 0.000 description 7
- 230000005415 magnetization Effects 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 230000005347 demagnetization Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000010734 process oil Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
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- 238000007796 conventional method Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
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Abstract
The present invention provides a kind of oil well determination of distance method and apparatus, and this method includes：Current source to the casing of the first oil well power so that the first oil well sleeve at alternating magnetic field after, obtain the amplitude for the alternating magnetic field that Magnetic Sensor detects, wherein, first oil well is an oil well for having completed drilling well process, Magnetic Sensor is fixed in the second oil well, second oil well is an oil well for carrying out drilling well process, and one end of current source is electrically connected with the top of the casing of the first oil well；The other end of current source is electrically connected with the earth except at least 50 meters or the other end of current source is electrically connected with the top of the casing of third oil well, and third oil well is the oil well that another has completed drilling well process, and with the first oil well at a distance of at least 50 meters；According to amplitude, the distance between the second oil well and the first oil well are determined；Effective detection range is longer, without any tool of tripping in drilling well, to not influence the normal production of drilling well.
Description
Technical field
The present invention relates to oil development drilling technology field more particularly to a kind of oil well determination of distance method and apparatus.
Background technology
For oil development drilling well, especially for the drilling well of cluster well and Encryption Well, need to carry out drilling well process, in turn
Obtain oil well.In drilling process, currently carrying out the oil well of drilling well process, it is most likely that be with other oil wells in position
It is adjacent.Due to casing programme complexity, the accident that the wellbore of adjacent oil well is mutually collided easily occurs in drilling process；In turn
The normal productive process for influencing whether oil well causes huge economic loss.In order to prevent in drilling process adjacent oil well well
The accident that eye mutually collides, can be in real time to carrying out the oil well of drilling well process, completing drilling process with other
The distance between oil well is detected.
In the prior art, a kind of active magnetic detection method may be used to go to detect the distance between adjacent oil well,
It carries out that two electromagnet that magnetic moment is equal in magnitude, direction is opposite are arranged in the oil well of drilling well process, the two electromagnet can be with magnetic
Change the casing of adjacent oil well；And a magnetic field sensor is installed at the center of two electromagnet, which can be with
The casing for detecting adjacent oil well magnetizes the magnetic field intensity information in the magnetic field generated later, and then is determined according to magnetic field intensity information
The distance between adjacent oil well.But the length of the detection instrument in the technology is longer, needs to reach 1.2 meters or more, can be to just
The guide function of drilling well has an adverse effect；Moreover, because being limited by underground power supply used and space, the magnetic that two electromagnet generate
Magnetizing field is weaker, therefore effective detection range is short, can only achieve several meters.
Invention content
The present invention provides a kind of oil well determination of distance method and apparatus, and to solve, effective detection range is shorter to ask
Topic.
On the one hand, the present invention provides a kind of oil well determination of distance method, including：
Current source to the casing of the first oil well power so that first oil well sleeve at alternating magnetic field after, obtain
Take the amplitude for the alternating magnetic field that Magnetic Sensor detects, wherein first oil well is one and has completed drilling well process
Oil well, the Magnetic Sensor is fixed in the second oil well, and second oil well is one and is carrying out drilling well process
Oil well, one end of the current source are electrically connected with the top of the casing of first oil well；The other end of the current source with it is big
Ground is electrically connected or the other end of the current source is electrically connected with the top of the casing of third oil well, and the third oil well is another
One oil well for having completed drilling well process；Wherein, tie point and the electricity of the other end of the current source with the earth
The distance between stream source is more than or equal to 50 meters；Distance is more than or equal to 50 meters between first oil well and the third oil well；
According to the amplitude, the distance between second oil well and first oil well are determined.
Further, the distance between second oil well and first oil well are
Wherein, H is the amplitude of the alternating magnetic field, and π is pi, μ0For space permeability, μ is the week of the casing of first oil well
The magnetic conductivity of exclosure layer,αBetween central axis for the casing of the central axis and first oil well of second oil well
Angle, angles of the θ between first straight line and second straight line, the first straight line are micro- circle on the casing of first oil well
Connection straight line between ring and the location point of the Magnetic Sensor, the second straight line are on the casing by first oil well
Micro- annulus and be parallel to second oil well central axis straight line, IlFor first oil well casing at depth l
Current strength, and Il=I0e-l/k, k is predetermined coefficient, I0It is inputted into the casing of first oil well for the current source
Current strength, depth l be first oil well casing on micro- annulus and first oil well casing top between
Distance.
Further, described to be powered to the casing of the first oil well in current source so that the sleeve of first oil well strikes a bargain
After varying magnetic field, the amplitude for the alternating magnetic field that Magnetic Sensor detects is obtained, including：
When the current source is not powered to the casing of first oil well, obtain the Magnetic Sensor detect it is quiet
The first magnetic field intensity information in magnetic field, and Fourier transformation is carried out to the first magnetic field intensity information, obtain the of magnetostatic field
One amplitude；
When the current source is powered to the casing of first oil well, the second magnetic that the Magnetic Sensor detects is obtained
Field intensity information, and Fourier transformation is carried out to the second magnetic field intensity information, obtain the second amplitude；
Second amplitude is subtracted into the first amplitude, obtains the amplitude of the alternating magnetic field.
Further, when the current source is not powered to the casing of first oil well, the Magnetic Sensor is obtained
The the first magnetic field intensity information detected, including：
First control signal is sent to the current source, current source is not to institute described in the first control signal characterization control
The casing power supply of the first oil well is stated, and obtains the first magnetic field intensity information；
When the current source is powered to the casing of first oil well, the second magnetic that the Magnetic Sensor detects is obtained
Field intensity information, including：
Second control signal is sent to the current source, current source described in the second control signal characterization control is to described
The casing of first oil well is powered, and obtains second amplitude.
Further, when the number of the first oil well is N number of, the number of the current source is N number of, and N is more than or equal to 2
Positive integer, the first oil well are connect correspondingly with current source, correspondingly, it is described in current source to the casing of the first oil well
Power so that first oil well sleeve at alternating magnetic field after, obtain the alternating magnetic field that detects of Magnetic Sensor
Amplitude, including：
Each current source in N number of current source input current into the casing of the first oil well corresponding with the current source
So that after the sleeve of each the first oil well is at alternating magnetic field, the alternating magnetic field signal that Magnetic Sensor detects is obtained,
In, the frequency for the electric current that different current sources is inputted into the casing of the first different oil wells is different；
Fourier transformation is carried out to the alternating magnetic field signal, obtains the corresponding amplitude of each described first oil well；
Correspondingly, according to the amplitude, the distance between second oil well and first oil well are determined, including：
According to the corresponding amplitude of the first oil well described in each, determine second oil well respectively with described in each first
The distance between oil well.
On the other hand, the present invention provides a kind of oil well determination of distance device, including：
Ground instrument, Magnetic Sensor and current source；
One end of the current source is electrically connected with the top of the casing of the first oil well, and first oil well is one complete
At the oil well of drilling well process；The ground instrument is electrically connected with the Magnetic Sensor, and the Magnetic Sensor is fixed at the second oil
In well, second oil well is an oil well for carrying out drilling well process；The other end of the current source is electrically connected with the earth,
Or the other end of the current source is electrically connected with the top of the casing of third oil well, the third oil well is that another is complete
At the oil well of drilling well process；Wherein, between the other end of the current source and the tie point and the current source of the earth
Distance is more than or equal to 50 meters；Distance is more than or equal to 50 meters between first oil well and the third oil well；
The current source, for powering to the casing of first oil well, so that the sleeve of first oil well strikes a bargain
Varying magnetic field；
The ground instrument, the amplitude for obtaining the alternating magnetic field that the Magnetic Sensor detects, and according to described
Amplitude determines the distance between second oil well and first oil well.
Further, the distance between second oil well and first oil well are
Wherein, H is the amplitude of the alternating magnetic field, and π is pi, μ0For space permeability, μ is the week of the casing of first oil well
The magnetic conductivity of exclosure layer, α are between the central axis of second oil well and the central axis of the casing of first oil well
Angle, angles of the θ between first straight line and second straight line, the first straight line are micro- circle on the casing of first oil well
Connection straight line between ring and the location point of the Magnetic Sensor, the second straight line are on the casing by first oil well
Micro- annulus and be parallel to second oil well central axis straight line, IlFor first oil well casing at depth l
Current strength, and Il=I0e-l/k, k is predetermined coefficient, I0It is inputted into the casing of first oil well for the current source
Current strength, depth l be first oil well casing on micro- annulus and first oil well casing top between
Distance；
The ground instrument, is specifically used for：
When the current source is not powered to the casing of first oil well, obtain the Magnetic Sensor detect it is quiet
The first magnetic field intensity information in magnetic field, and Fourier transformation is carried out to the first magnetic field intensity information, obtain the of magnetostatic field
One amplitude；
When the current source is powered to the casing of first oil well, the second magnetic that the Magnetic Sensor detects is obtained
Field intensity information, and Fourier transformation is carried out to the second magnetic field intensity information, obtain the second amplitude；
Second amplitude is subtracted into the first amplitude, obtains the amplitude of the alternating magnetic field.
Further, the ground instrument, is additionally operable to：
Each current source in N number of current source input current into the casing of the first oil well corresponding with the current source
So that after the sleeve of each the first oil well is at alternating magnetic field, the alternating magnetic field signal that Magnetic Sensor detects is obtained,
In, the frequency for the electric current that different current sources is inputted into the casing of the first different oil wells is different, and the number of the first oil well is N
A, N is the positive integer more than or equal to 2, and the first oil well is connect correspondingly with current source；
Fourier transformation is carried out to the alternating magnetic field signal, obtains the corresponding amplitude of each described first oil well；
According to the amplitude of the corresponding alternating magnetic field of the first oil well described in each, determine second oil well respectively with it is each
The distance between a described first oil well.
Further, the Magnetic Sensor is located in inserting tube, wherein the inserting tube be located at the drill bit of second oil well with
Between non magnetic drill collar.
Further, the ground instrument is electrically connected with the current source；
The ground instrument is additionally operable to send first control signal to the current source, to control the current source not to institute
The casing power supply for stating the first oil well, is additionally operable to send second control signal to the current source, to control the current source to institute
State the casing power supply of the first oil well.
Further, the Magnetic Sensor is spirally connected with the inserting tube；Alternatively, being fixedly connected on the inserting tube, there are one closings
Box, the Magnetic Sensor are fixed in the closing box.
Further, it is provided with sealing ring on the edge of the closing box,
Further, the closing box is square or cuboid or cylinder.
Further, it is provided with drilling equipment in second oil well.
Further, one end of the current source is electrically connected by the first conducting wire with the top of the casing of the first oil well；Institute
The other end for stating current source is electrically connected with the earth by the second conducting wire or the other end of the current source is led by described second
Line is electrically connected with the top of the casing of the third oil well.
Oil well determination of distance method and apparatus provided by the invention, by inputting alternation electricity in the casing into drilling well
Stream, and then the casing of drilling well is magnetized, then the Magnetic Sensor in positive drilling well is got produced by the casing of drilling well
The amplitude information of alternating magnetic field, ground instrument so as to according to the amplitude information calculate positive drilling well and between drilling well away from
From, which can preferably symbolize the information of drilling well, and then can accurately determine out two adjacent oil wells it
Between distance, measurement accuracy is higher；Wherein, the other end of current source and the distance between the tie point of the earth and current source are big
In equal to 50 meters, alternatively, distance is more than or equal to 50 meters between the first oil well and third oil well, and then short distance circuit is avoided the formation of
And cause electric current that can not flow downward along the casing of drilling well；Scheme provided in this embodiment, can be in the drilling well of positive drilling well
In the process, the distance between detection and adjacent oil well in real time, that is, provide an offset well apart from measurement while drilling device and scheme.
In the present embodiment, it is only necessary to connect one end of current source with the top of the casing of drilling well, without the tripping in times in drilling well
What tool, to not influence the normal production of drilling well, and it is provided in this embodiment apart from detection scheme safe operation, side
Just；And powerful electric current demagnetization casing is used, magnetizing field strength can be effectively enhanced, improves ranging distance and essence
Degree provides an effective technological means for offset well distance measurement and cluster well anticollision.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.
Fig. 1 is a kind of flow diagram of oil well determination of distance method provided in an embodiment of the present invention；
Fig. 2 is the flow diagram of another oil well determination of distance method provided in an embodiment of the present invention；
Fig. 3 is on the casing of the first oil well in another oil well determination of distance method provided in an embodiment of the present invention
The schematic diagram of alternating magnetic field；
Fig. 4 is the friendship of the casing of the first oil well in another oil well determination of distance method provided in an embodiment of the present invention
The derivation model schematic of varying magnetic field；
Fig. 5 is the flow diagram of another oil well determination of distance method provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of oil well determination of distance device provided in an embodiment of the present invention；
Fig. 7 is a kind of measuring principle schematic diagram of oil well determination of distance device provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of another oil well determination of distance device provided in an embodiment of the present invention；
Fig. 9 is the measuring principle schematic diagram of another oil well determination of distance device provided in an embodiment of the present invention.
Reference numeral：
61：Ground instrument； 62：Magnetic Sensor； 63：Current source；
64：First oil well； 65：Casing； 66：Second oil well；
71：Inserting tube； 72：Drilling rod； 73：Drill collar
74：Measurement-while-drilling system； 75：Power drilling tool； 76：Drill bit.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all implementations consistent with this disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
Noun according to the present invention is explained first：
Positive drilling well：Carrying out the oil well of drilling well process.Drilling well：The oil well of drilling well process is completed.
The specific application scenarios of the present invention are as follows.This kind of oil well of cluster well, with its economical and efficient, facilitate management etc. it is many excellent
Gesture and by ocean, land oil field institute it is widely used.With the exploitation of large oilfield, the directed-drilling technique of cluster well has obtained length
The development and raising of foot, but between oil well well spacing it is smaller and smaller, it is complicated plus the casing programme of oil well, thus in drilling well
The accident that the wellbore of adjacent oil well is mutually collided easily occurs in the process.Wellbore collision accident can bring serious consequence, gently then
The casing deformation of drilling well, casing that is heavy then drilling drilling well are caused, and then influences the normal production of oil well, causes huge warp
Ji loss.Therefore, the wellbore collision problem for solving cluster well, to ensureing that it is particularly important that the drillng operation of cluster well has safely
Meaning.So as to carry out the measurement of the distance between adjacent oil well, i.e., positive drilling well and the distance between drilling well are surveyed
Amount.
Now, the Scientific Drilling International companies in the U.S. use a kind of passive magnetic detection
Method, principle are that magnetic field sensor is arranged in positive drilling well, using the magnetic field sensor detection by earth's magnetic field it is magnetized it is adjacent
Magnetic anomaly field information caused by the casing of drilling well, and then positive drilling well determined according to the magnetic anomaly field information and between drilling well
Distance.But since the magnetic field intensity in earth's magnetic field is relatively weak, the casing for magnetizing drilling well by earth's magnetic field is generated later
Magnetic anomaly field intensity is also weaker, detects faint magnetic field signal to need high-precision Magnetic Sensor, is surveyed to increase
The cost of amount；Also, generated magnetic anomaly field intensity is weaker after being also due to the casing of earth's magnetic field magnetization drilling well, to
This method can only the closer oil well of detection range, and detection accuracy is relatively low.
In addition, the Wu Zhiyong et al. of China University Of Petroleum Beijing proposes another active magnetic detection method, this method is just
Magnetize the casing of adjacent oil well using two electromagnet that magnetic moment is equal in magnitude, direction is opposite in drilling well, and in two electricity
Magnetic blow out centre installs a magnetic field sensor, and the detection magnetized magnetic field intensity information of casing, Jin Ergen are removed using the Magnetic Sensor
Distance between two oil wells is determined according to the magnetic field intensity information.But in this method, the detection instrument that is detected
Length is longer, needs to reach 1.2 meters or more, and then can have an adverse effect to the guide function of positive drilling well.Moreover, because by well
The limitation of lower power supply and space, the magnetizing field that two electromagnet generate is weaker, therefore effective detection range can only achieve several meters.
It is used at present to meet that accuracy is high, ranging is remote, easy to operate simultaneously with boring distance measuring method to sum up
Deng requirement.In addition, when the periphery of positive drilling well is there are when more mouthfuls of drilling wells, current can not determine positive brill with brill distance measuring method
Well respectively with more mouthfuls of drilling wells the distance between.Oil well determination of distance method and apparatus provided by the invention, it is intended to solve
The technical problem as above of the prior art.
How technical scheme of the present invention and technical scheme of the present invention are solved with specific embodiment below above-mentioned
Technical problem is described in detail.These specific embodiments can be combined with each other below, for same or analogous concept
Or process may repeat no more in certain embodiments.Below in conjunction with attached drawing, the embodiment of the present invention is described.
Fig. 1 is a kind of flow diagram of oil well determination of distance method provided in an embodiment of the present invention.As shown in Figure 1,
This method includes：
Step 101, current source to the casing of the first oil well power so that the first oil well sleeve at alternating magnetic field it
Afterwards, the amplitude for the alternating magnetic field that Magnetic Sensor detects is obtained, wherein the first oil well is the oil for having completed drilling well process
Well, Magnetic Sensor are fixed in the second oil well, and the second oil well is an oil well for carrying out drilling well process, current source
One end is electrically connected with the top of the casing of the first oil well；The other end of current source with the earth be electrically connected or current source it is another
End is electrically connected with the top of the casing of third oil well, and third oil well is the oil well that another has completed drilling well process；Wherein, electric
The other end in stream source and the distance between the tie point of the earth and current source are more than or equal to 50 meters；First oil well and third oil well
Between distance be more than or equal to 50 meters.
In the present embodiment, specifically, the executive agent of the present embodiment can be ground instrument or other devices or set
It is standby.The present embodiment is introduced by ground instrument of executive agent.
First oil well is an oil well for having completed drilling well process, and the second oil well is one and is carrying out drilling well process
Oil well.During carrying out drilling well to the second oil well, need to measure the distance between the first oil well and the second oil well in real time,
It is mutually collided to avoid wellbore.
First, a Magnetic Sensor is fixed in the second oil well, Magnetic Sensor and ground instrument is electrically connected.
A powerful current source is provided, one end of current source and the top of the casing of the first oil well are electrically connected.And
The other end of current source and the earth are electrically connected, wherein the other end of current source and the tie point of the earth and current source it
Between distance need be more than or equal to 50 meters；Alternatively, the top of the other end of current source and the casing of a third oil well is carried out
Electrical connection, wherein third oil well is the oil well that another has completed drilling well process, is needed between the first oil well and third oil well
Distance is more than or equal to 50 meters.Also, the powerful current source setting is on the ground.
Specifically, the first oil well is a drilling well, and the second oil well is a positive drilling well；Near drilling well site
A powerful current source is placed on ground, which is connected on drilling well-head casing；The current source it is another
One end be connected to another drilling well or the current source except 50 meters the other end be connected to except 50 meters with greatly connect
Touch good copper electrode on, and then avoid the formation of short distance circuit and cause electric current can not along drilling well casing to flow down
It is dynamic.Wherein, above-mentioned copper electrode is the tie point of the other end and the earth of current source.
Then, alternating current is injected into the first oil well using powerful current source, which is low frequency, big work(
The frequency of the electric current of rate, the alternating current is generally less than 30 hertz (Hz), and alternating current size is I0, so as to oily by first
The casing of well is magnetized, and the casing of the first oil well forms an alternating magnetic field.
Due to being provided with a Magnetic Sensor in the second oil well, Magnetic Sensor is electrically connected with ground instrument.To magnetic
The casing that sensor can receive the first oil well is formed by the magnetic field intensity information of alternating magnetic field, which is
The amplitude of alternating magnetic field, in turn, ground instrument can get the amplitude of the alternating magnetic field detected by Magnetic Sensor.
Step 102, according to amplitude, determine the distance between the second oil well and the first oil well.
In the present embodiment, specifically, ground instrument is according to the amplitude of the alternating magnetic field got, according to carrying in the prior art
The oil well distance calculating method of confession, can calculate the distance between the second oil well and the first oil well, which is a vector
Distance.
The present embodiment magnetizes by input current in the casing into drilling well, and then by the casing of drilling well, so
The Magnetic Sensor in positive drilling well gets the amplitude information of alternating magnetic field produced by the casing of drilling well afterwards, ground instrument so as to
Positive drilling well and the distance between drilling well are calculated according to the amplitude information, which can preferably symbolize drilling well
Information, and then the distance between two adjacent oil wells can be accurately determined out, measurement accuracy is higher；Wherein, current source
The distance between tie point and current source of the other end and the earth are more than or equal to 50 meters, alternatively, the first oil well and third oil well it
Between distance be more than or equal to 50 meters, and then avoid the formation of short distance circuit and cause electric current can not along drilling well casing to flow down
It is dynamic；Scheme provided in this embodiment, can in the drilling process of positive drilling well, in real time detection adjacent oil well between away from
From providing an offset well apart from measurement while drilling device and scheme；Also, in the present embodiment, it is only necessary to by the one of current source
End is connect with the top of the casing of drilling well, without any tool of tripping in drilling well, to not influence the normal of drilling well
Production, and it is provided in this embodiment apart from detection scheme safe operation, conveniently；And use powerful electric current demagnetization set
Pipe can effectively enhance magnetizing field strength, improve ranging distance and precision, carried with cluster well anticollision for offset well distance measurement
An effective technological means is supplied.
Fig. 2 is the flow diagram of another oil well determination of distance method provided in an embodiment of the present invention.Such as Fig. 2 institutes
Show, this method includes：
Step 201, when current source is not powered to the casing of the first oil well, obtain the magnetostatic field that detects of Magnetic Sensor
The first magnetic field intensity information, and to the first magnetic field intensity information carry out Fourier transformation, obtain the first amplitude of magnetostatic field.
In optionally a kind of embodiment, step 201 specifically includes：To current source send first control signal, first
It controls characterization control current source not power to the casing of the first oil well, and obtains the first magnetic field intensity information, and to first
Magnetic field intensity information carries out Fourier transformation, obtains the first amplitude of magnetostatic field.
Wherein, the first oil well is an oil well for having completed drilling well process, and Magnetic Sensor is fixed at the second oil well
In, the second oil well is an oil well for carrying out drilling well process, the top electricity of one end of current source and the casing of the first oil well
Connection；The other end of current source is electrically connected with the earth or the other end of current source and the top of the casing of third oil well are electrically connected
It connects, third oil well is the oil well that another has completed drilling well process.
In the present embodiment, specifically, the executive agent of the present embodiment can be ground instrument or other devices or set
It is standby.The present embodiment is introduced by ground instrument of executive agent.
First oil well is an oil well for having completed drilling well process, and the second oil well is one and is carrying out drilling well process
Oil well.During carrying out drilling well to the second oil well, need to measure the distance between the first oil well and the second oil well in real time,
It is mutually collided to avoid wellbore.
First, a Magnetic Sensor is fixed in the second oil well, Magnetic Sensor and ground instrument is electrically connected；
Specifically, an inserting tube is set between the drill bit and non magnetic drill collar of the second oil well, Magnetic Sensor is arranged in inserting tube, magnetic
Sensor is used to receive the Magnetic Field generated after casing magnetization；Also, the circuit in inserting tube can be by collected magnetic field number
According to being uploaded to ground instrument by measurement-while-drilling system (Measurement While Drilling, abbreviation MWD).Provide one
A powerful current source, one end of current source and the top of the casing of the first oil well are electrically connected；And by current source
The other end be electrically connected with the earth, or the top of the other end of current source and the casing of a third oil well carried out electric
Connection, wherein third oil well is the oil well that another has completed drilling well process.Also, the powerful current source setting exists
On ground.Current source is electrically connected with ground instrument.
Specifically, the first oil well is a drilling well, and the second oil well is a positive drilling well；Near drilling well site
A powerful current source is placed on ground, which is connected on drilling well-head casing；The current source it is another
One end be connected to another drilling well or the current source except 50 meters the other end be connected to except 50 meters with greatly connect
Touch good copper electrode on, and then avoid the formation of short distance circuit and cause electric current can not along drilling well casing to flow down
It is dynamic.Wherein, above-mentioned copper electrode is the tie point of the other end and the earth of current source.
Then, ground instrument to current source send first control signal, the first control signal characterization control current source not to
The casing of first oil well is powered, at this point, current source is not powered into the casing of the first oil well, i.e., current source is not to the first oil
Input AC electric current in the casing of well；To at this point, not by injection alternating current in the casing of the first oil well, the first oil well
Casing is not magnetized；At this point, the Magnetic Sensor in the second oil well receive be the earth magnetostatic field the first magnetic field intensity
Information；Then ground instrument gets the first magnetic field intensity information, and instrument pair the first magnetic field intensity information in ground carries out Fourier transformation,
It can obtain the amplitude H of magnetostatic field., the amplitude H of the magnetostatic field of the earth.For first amplitude.Wherein, the first oil well be one
Drilling well, the second oil well are a positive drilling wells.Also, when drilling well at a distance from positive drilling well farther out when, such as distance is more than
It when 20 meters, is not enough to be received by Magnetic Sensor since the magnetic field that is magnetized is too small, to which ground instrument can only calculate the earth
The amplitude H of magnetostatic field..
Step 202, when current source is powered to the casing of the first oil well, it is strong to obtain the second magnetic field for detecting of Magnetic Sensor
Information is spent, and Fourier transformation is carried out to the second magnetic field intensity information, obtains the second amplitude.
In optionally a kind of embodiment, step 202 specifically includes：To current source send second control signal, second
It controls characterization and controls current source to the power supply of the casing of the first oil well, and obtain the second magnetic field intensity information, and to the second magnetic
Field intensity information carries out Fourier transformation, obtains the second amplitude.
In the present embodiment, specifically, ground instrument sends second control signal to current source, second control signal characterizes
It controls current source to power to the casing of the first oil well, at this point, current source is powered into the casing of the first oil well, i.e. current source is to the
Input AC electric current in the casing of one oil well；To at this point, by injection alternating current in the casing of the first oil well, the first oil well
Casing is magnetized；At this point, what the Magnetic Sensor in the second oil well received is the second magnetic field intensity information；Ground instrument obtains second
Magnetic field intensity information, then the second magnetic field intensity of ground instrument pair information progress Fourier transformation, obtains a second amplitude H ', this
When, the second amplitude H ' is the amplitude H of the magnetostatic field of the earth.In addition the amplitude H of alternating magnetic field.
Second amplitude is subtracted first amplitude by step 203, obtains the amplitude of alternating magnetic field.
In the present embodiment, specifically, the second amplitude is subtracted first amplitude by ground instrument, the amplitude H of alternating magnetic field is obtained.
Step 204, according to amplitude, determine that the distance between the second oil well and the first oil well are
Wherein, H is the amplitude of alternating magnetic field, and π is pi, μ0For space permeability, μ is the surrounding formation of the casing of the first oil well
Magnetic conductivity, α are the angle between the central axis of the second oil well and the central axis of the casing of the first oil well, and θ is first straight line
Angle between second straight line, first straight line is for micro- annulus on the casing of the first oil well and between the location point of Magnetic Sensor
Connection straight line, second straight line is by micro- annulus on the casing of the first oil well and to be parallel to the central axis of the second oil well
Straight line, IlFor current strength of the casing at depth l of the first oil well, and Il=I0e-l/k, k is predetermined coefficient, I0For electric current
The current strength that source is inputted into the casing of the first oil well, depth l are micro- annulus and the first oil on the casing of the first oil well
The distance between top of casing of well.
In the present embodiment, specifically, Fig. 3 is in another oil well determination of distance method provided in an embodiment of the present invention
The first oil well casing on alternating magnetic field schematic diagram, as shown in figure 3, current source to the casing of the first oil well provide friendship
After galvanic electricity stream, during electric current flows downward along the casing of the first oil well, can constantly have and flow into leaking for surrounding formation
Electric current Id, i.e. electric current can be lost in, but since the casing of the first oil well is ferromagnetic material, the resistivity of casing is minimum, casing
6~7 orders of magnitude of resisitivity of resistivity and stratum, therefore, leak electric current IdIt is very small.
In figure 3, since the length of casing is far longer than the diameter and thickness of casing, so as to the casing etc. after being powered
Effect is an electromotion straight wire, and casing can be resolved into several micro- annulus dl '.The casing of first oil well is connect with current source
Point be decanting point, the current strength of the electric current that current source input to the casing of the first oil well is I0, it is assumed that the first oil well
Some micro- annulus P on casing is depth l at a distance from decanting point, then the electric current I at PlExponential law is carried out as follows
Decaying, Il=I0e-l/k, k is predetermined coefficient, and coefficient k can be by the diameter of phi of casing, the resistance R of cannula unit length and casing
The conductivityσ etc. of surrounding formation is determined.Specifically, depth l is the circle of a micro- annulus on the casing of the first oil well
The distance between the heart and decanting point, alternatively, when regarding micro- annulus at as one, depth l is on the casing of the first oil well
A micro- annulus and the distance between decanting point.
Casing after energization is equivalent to electromotion straight wire, takes micro- circle that a width is dl ' at the P of any point on casing
Ring calculates the magnetic field intensity that micro- annulus generates at the location point Q of magnetic field sensor by Biot-Savart law；Again to whole
All micro- annulus dl ' are integrated on a casing, obtain the letter that the magnitude of field intensity that entire casing generates at Q is met
Number relationshipWherein, π is pi, and d is pre-determined distance, μ0For space permeability, μ is
The magnetic conductivity of the surrounding formation of the casing of first oil well, α are the center of the central axis of the second oil well and the casing of the first oil well
Angle between axis, angles of the θ between first straight line and second straight line, first straight line are micro- on the casing of the first oil well
Connection straight line between annulus and the location point of Magnetic Sensor, second straight line be by the casing of the first oil well micro- annulus,
And it is parallel to the straight line of the central axis of the second oil well, IlFor current strength of the casing at depth l of the first oil well, and Il=
I0e-l/k, k is predetermined coefficient, I0For the current strength that current source is inputted into the casing of the first oil well, depth l is the first oil
The distance between the top of casing of micro- annulus and the first oil well on the casing of well.Wherein, μ can measure before ranging
It arrives；IlIt can be calculated by casing and formation parameter with before boring ranging；α can be measured in real time when carrying out ranging
It arrives.
Specifically, Fig. 4 is the first oil well in another oil well determination of distance method provided in an embodiment of the present invention
Casing alternating magnetic field derivation model schematic, as shown in figure 4, establishing a three-dimensional cartesian coordinate system, Magnetic Sensor position
It is location point Q in the point on the second oil well, there are one central axis, the central axis of the second oil well can also claim the second oil well tool
The central axis for making the inserting tube of the second oil well, will by location point Q and perpendicular to the straight line of the central axis of the second oil well as
The Y-axis of three-dimensional cartesian coordinate system；There is first oil well central axis, the central axis of the first oil well may also be referred to as the first oil well
Casing central axis, there are one intersection points for tool between the central axis of the casing of Y-axis and the first oil well, using the intersection point as three
Tie up the origin O of rectangular coordinate system；Using by origin O and be parallel to the second oil well central axis straight line as three-dimensional right angle
The Z axis of coordinate system；Using both perpendicular to Y-axis and Z axis and by the straight line of origin O as the X-axis of three-dimensional cartesian coordinate system.It can
With by the distance between the central axis of Z axis and the second oil well d, as the distance between the first oil well and the second oil well d.
Angle between the central axis of the casing of the central axis of second oil well and the first oil well is α.Due to casing
Length is far longer than the diameter and thickness of casing, and so as to which the casing after being powered is equivalent to electromotion straight wire, casing is decomposed
Being formed by angle at several micro- annulus dl ', at each micro- annulus dl ' and location point Q of the magnetic field sensor in inserting tube is
θ, specifically, angles of the θ between first straight line and second straight line, first straight line is micro- annulus on the casing of the first oil well
Connection straight line between P and the location point Q of Magnetic Sensor, second straight line be by micro- annulus on the casing of the first oil well and
It is parallel to the straight line of the central axis of the second oil well, wherein P can be the centre point of micro- annulus, can also be regarded as micro- annulus
One point P；The distance between location point Q of micro- annulus P and Magnetic Sensor on the casing of first oil well is r.Wherein, distance l '
For the distance between micro- annulus P and origin O.
First, known by Biot-Savart law, a width is micro- annulus of dl ' in magnetic field sensing at certain point P on casing
The magnetic induction intensity of generation is at the location point Q of deviceWherein, preferably
, μ0=4 π × 10-7Tm/A。
Then it needs, derives l ' and θ, the relationship of r and θ；ByIt can obtainThen rightBoth members simultaneously to θ carry out differential, then haveThen, then byIt obtains
Then, willWithIt is updated toIn, it is obtained after arranging
Then, according to the relationship dH=dB/ μ of magnetic field intensity dH and magnetic induction intensity dB, the P points of the casing after being energized
The magnetic field intensity that micro- annulus that one, place width is dl ' generates
Then, micro- annulus dl ' all on entire casing is integrated, obtains entire casing and is passed in the magnetic field of positive drilling well
The magnetic field intensity generated at sensor
It is thus possible to obtain formula
To by calculated amplitude H in step 203, be updated toIn, Ke Yiji
Calculation obtains the distance between the second oil well and the first oil well d；From Fig. 4, the distance between the second oil well and the first oil well d,
For the distance between the central axis of Z axis and the second oil well.
The present embodiment carries out magnetic by input AC electric current in the casing into drilling well, and then by the casing of drilling well
Change, then the Magnetic Sensor in positive drilling well gets the amplitude information of alternating magnetic field produced by the casing of drilling well, ground instrument from
And positive drilling well and the distance between drilling well can be calculated according to the amplitude information, which can preferably symbolize
The distance between the information of drilling well, and then two adjacent oil wells can be accurately determined out, measurement accuracy is higher；The present embodiment
The scheme of offer, can be in the drilling process of positive drilling well, and the distance between detection and adjacent oil well, that is, provide one in real time
A offset well is apart from measurement while drilling device and scheme；Also, in the present embodiment, it is only necessary to by the set of one end of current source and drilling well
The top of pipe connects, without any tool of tripping in drilling well, to not influence the normal production of drilling well, and this implementation
Example provide apart from detection scheme safe operation, conveniently；And powerful electric current demagnetization casing is used, can effectively be increased
Hard magnetization field intensity improves ranging distance and precision, and one is provided effectively for offset well distance measurement and cluster well anticollision
Technological means.Also, this gives the specific formula for calculation and method that calculate distance.
Fig. 5 is the flow diagram of another oil well determination of distance method provided in an embodiment of the present invention.Such as Fig. 5 institutes
Show, this method includes：
Step 301, when the number of the first oil well is N number of, the number of current source is N number of, and N is just whole more than or equal to 2
Number, the first oil well connect correspondingly with current source, each current source in N number of current source to the current source
Input current in the casing of corresponding first oil well so that each the first oil well sleeve at alternating magnetic field after, obtain magnetic
The casing for each the first oil well that sensor detects is formed by the amplitude of alternating magnetic field, wherein different current sources to
The frequency of the electric current inputted in the casing of the first different oil wells is different；Wherein, each first oil well has been completed for one
The oil well of drilling well process, Magnetic Sensor are fixed in the second oil well, and the second oil well is one and is carrying out drilling well process
The top of the casing of oil well, one end of each current source and the first oil well corresponding with the current source is electrically connected；Each electricity
The other end in stream source and the earth are electrically connected or the other end of each current source and third oil well corresponding with the current source
The top of casing is electrically connected, and third oil well is the oil well that another has completed drilling well process；Wherein, each current source is another
The distance between tie point and the current source of one end and the earth are more than or equal to 50 meters；Each first oil well respectively with third
Distance is more than or equal to 50 meters between oil well.
In the present embodiment, specifically, the executive agent of the present embodiment can be ground instrument or other devices or set
It is standby.The present embodiment is introduced by ground instrument of executive agent.
When there is N number of drilling well around the second oil well, wherein N is more than or equal to 2, the i.e. number of the first oil well
When being at least two.First, a Magnetic Sensor is fixed in the second oil well, by Magnetic Sensor and ground instrument into
Row electrical connection.And it is provided for each first oil well and distinguishes one-to-one current source with each first oil well,
The top of the casing of one end of each current source and the first oil well corresponding with the current source is electrically connected, different
The frequency for the electric current that current source is inputted into the casing of the first different oil wells is different.The other end of each current source and the earth
Electrical connection, wherein the other end of each current source and the distance between the tie point of the earth and the current source are more than or equal to 50
Rice；Alternatively, the top electrical connection of the casing of the other end of each current source and third oil well corresponding with the current source, third
Oil well is that another has completed the oil well of drilling well process, wherein each first oil well distance between third oil well respectively
More than or equal to 50 meters.
For each first oil well, the step 101 in principle and Fig. 1 that magnetic field generates, the step 201- in Fig. 2
203 is identical, repeats no more.
Step 302 carries out Fourier transformation to alternating magnetic field signal, obtains each corresponding amplitude of the first oil well.
In the present embodiment, specifically, in the present embodiment, ground instrument is needed to the alternating magnetic field signal in step 301
Fourier transformation is carried out, the amplitude H ' of each the first oil well is can be obtained by after by Fourier transformation.Then ground
Instrument needs to subtract the amplitude H ' of each the first oil well into the amplitude H of magnetostatic field corresponding with first oil well first., obtain
The final amplitude H " of each the first oil well.And then the amplitude H " of the alternating magnetic field of each oil well can be solved.
For example, there are three mouthfuls of drilling well A, B, C around positive drilling well, and three powerful current sources point may be used
It is passed through f simultaneously not into the casing of tri- mouthfuls of wells of A, B, CA、fB、fCLow frequency, the alternating current of three kinds of different frequencies, to positioned at just
Magnetic field sensor in drilling well will detect that i.e. magnetic field sensor receives magnetic containing there are three types of the magnetic induction intensity signal of different frequency
The amplitude that field intensity information is characterized is that the amplitude of the magnetostatic field of the earth is superimposed with the magnetized alternation magnetic of tri- mouthfuls of casings of A, B, C
The amplitude of field, i.e. H0+H(fA)+H(fB)+H(fC), wherein H (fA) be drilling well A casing magnetization after the alternating magnetic field that generates
Amplitude, H (fB) be drilling well B casing magnetization after the amplitude of alternating magnetic field that generates, H (fC) be drilling well C casing magnetization after
The amplitude of the alternating magnetic field of generation.The signal that ground instrument transmits Magnetic Sensor carries out Fourier transformation, so as to respectively
Find out the amplitude size of the alternating magnetic field of three kinds of frequencies.
In the present embodiment, powerful power supply can also be used by the timesharing of surface power supply switching system to multiple
The casing of first oil well injects identical low-frequency ac electric current, and then simplifies ground system.
Step 303, according to each corresponding amplitude of the first oil well, determine the second oil well respectively with each the first oil well
The distance between.
In the present embodiment, specifically, for each the first oil well, calculate the second oil well and each first oil well it
Between apart from when, the method in step 101 or Fig. 2 in Fig. 1 in step 204-207 may be used and calculated.
For example, around positive drilling well there are three mouthfuls drilling well A, B, C when, for each well, respectively
Using the distance calculating method of Fig. 1 or Fig. 2, it may be determined that three mouthfuls of drilling wells respectively with positive drilling well distance dA、dBAnd dC。
The present embodiment by current source to the casing of each the first oil well power so that each the first oil well set
Pipe is formed after alternating magnetic field, and the amplitude for the alternating magnetic field that Magnetic Sensor detects is obtained；Fu is carried out to the amplitude of alternating magnetic field
In leaf transformation, obtain each corresponding amplitude of the first oil well；According to each corresponding amplitude of the first oil well, the second oil is determined
Well is respectively the distance between with each the first oil well.So as to positive drilling well respectively with multiple the distance between drilling wells into
Row measures.
Fig. 6 is a kind of structural schematic diagram of oil well determination of distance device provided in an embodiment of the present invention, and Fig. 7 is the present invention
A kind of measuring principle schematic diagram for oil well determination of distance device that embodiment provides, as shown in Figure 6 and Figure 7, the present embodiment
Device may include：
Ground instrument 61, Magnetic Sensor 62 and current source 63；
One end of current source 63 is electrically connected with the top of the casing 65 of the first oil well 64, and the first oil well 64 is one complete
At the oil well of drilling well process；Ground instrument 61 is electrically connected with Magnetic Sensor 62, and Magnetic Sensor 62 is fixed in the second oil well 66,
Second oil well 66 is an oil well for carrying out drilling well process；The other end of current source 63 is electrically connected with the earth or electric current
The other end in source 63 is electrically connected with the top of the casing of third oil well, and third oil well is the oil that another has completed drilling well process
Well；Wherein, the other end of current source 63 and the distance between the tie point of the earth and current source 63 are more than or equal to 50 meters；First
Distance is more than or equal to 50 meters between oil well 64 and third oil well.
Current source 63, for powering to the casing 65 of the first oil well 64, so that the casing 65 of the first oil well 64 forms alternation
Magnetic field；
Ground instrument 61, the amplitude for obtaining the alternating magnetic field that Magnetic Sensor 62 detects, and according to amplitude, determine second
The distance between oil well 66 and the first oil well 64.
In the present embodiment, specifically, the ground instrument 61, Magnetic Sensor 62 in Fig. 6 in dotted line frame and 63 structure of current source
At oil well determination of distance device.
First oil well 64 is an oil well for having completed drilling well process, and the second oil well 66 is one and is carrying out spudder
The oil well of sequence.During carrying out drilling well to the second oil well 66, need to measure the first oil well 64 and the second oil well 66 in real time
The distance between, it is mutually collided to avoid wellbore.
First, a Magnetic Sensor 62 is fixed in the second oil well 66, by Magnetic Sensor 62 and ground instrument 61 into
Row electrical connection.A powerful current source 63 is provided, by the top of one end of current source 63 and the casing 65 of the first oil well 64
End is electrically connected；And by the other end of current source 63 and the earth be electrically connected, or by the other end of current source 63 with
The top of the casing of one third oil well is electrically connected, wherein third oil well is the oil that another has completed drilling well process
Well.Also, the powerful current source 63 is arranged on the ground.
Specifically, the first oil well 64 is a drilling well, and the second oil well 66 is a positive drilling well；It is attached in drilling well site
A powerful current source 63 is placed on close ground, which is connected on drilling well-head casing 65；It should
The other end that the other end of current source 63 is connected to another drilling well or the current source 63 except 50 meters is connected to 50 meters
Except with greatly contact on good copper electrode, and then avoid the formation of short distance circuit and cause electric current can not be along drilling well
Casing 65 flow downward.Wherein, above-mentioned copper electrode is the tie point of the other end and the earth of current source 63.
Then, alternating current is injected into the first oil well 64 using powerful current source 63, the alternating current be low frequency,
The frequency of powerful electric current, the alternating current is generally less than 30 hertz (Hz), and alternating current size is I0, so as to by
The casing 65 of one oil well 64 is magnetized, and the casing 65 of the first oil well 64 forms an alternating magnetic field.
Due to being provided with a Magnetic Sensor 62 in the second drilling well, Magnetic Sensor 62 is electrically connected with ground instrument 61.
To which the casing 65 that Magnetic Sensor 62 can receive the first oil well 64 is formed by the magnetic field intensity information of alternating magnetic field, the magnetic
Field intensity information is the amplitude of alternating magnetic field, and in turn, ground instrument 61 can get the alternation magnetic detected by Magnetic Sensor 62
The amplitude of field.
Ground instrument 61 is according to the amplitude of the alternating magnetic field got, according to the oil well distance calculating side provided in the prior art
Method, can calculate the distance between the second oil well 66 and the first oil well 64, which is a vector distance.
The present embodiment provides the device being made of ground instrument 61, Magnetic Sensor 62 and current source 63, the one of current source 63
End is electrically connected with the top of the casing 65 of the first oil well 64, and the first oil well 64 is an oil well for having completed drilling well process；Ground
Face instrument 61 is electrically connected with Magnetic Sensor 62, and Magnetic Sensor 62 is fixed in the second oil well 66, the second oil well 66 be one just
In the oil well for carrying out drilling well process；The other end of current source 63 is electrically connected with the earth or the other end and third of current source 63
The top of the casing of oil well is electrically connected, and third oil well is the oil well that another has completed drilling well process；Current source 63, for
The casing 65 of first oil well 64 is powered, so that the casing 65 of the first oil well 64 forms alternating magnetic field；Ground instrument 61, for obtaining magnetic
The amplitude for the alternating magnetic field that sensor 62 detects, and according to amplitude, determine between the second oil well 66 and the first oil well 64 away from
From.In the present embodiment, by input current in the casing 65 into drilling well, and then the casing of drilling well 65 is magnetized,
Then the Magnetic Sensor 62 in positive drilling well gets the amplitude information of alternating magnetic field produced by the casing 65 of drilling well, ground instrument 61
So as to calculate positive drilling well and the distance between drilling well according to the amplitude information, which can preferably characterize
The distance between go out the information of drilling well, and then two adjacent oil wells can be accurately determined out, measurement accuracy is higher；This implementation
The scheme that example provides, can be in the drilling process of positive drilling well, and the distance between detection and adjacent oil well, that is, provide in real time
One offset well is apart from measurement while drilling device and scheme；Also, in the present embodiment, it is only necessary to by one end of current source 63 and drilling well
Casing 65 top connection, without any tool of tripping in drilling well, to not influence the normal production of drilling well, and
It is provided in this embodiment apart from detection scheme safe operation, conveniently；And powerful alternating current demagnetization casing 65 is used,
Magnetizing field strength can effectively be enhanced, ranging distance and precision is improved, provided for offset well distance measurement and cluster well anticollision
One effective technological means.
Fig. 8 is the structural schematic diagram of another oil well determination of distance device provided in an embodiment of the present invention, and Fig. 9 is this hair
The measuring principle schematic diagram for another oil well determination of distance device that bright embodiment provides, in Fig. 6 and embodiment illustrated in fig. 7
On the basis of, as shown in Figure 8 and Figure 9, Magnetic Sensor 62 is located in inserting tube 71, wherein inserting tube 71 is located at the drill bit of the second oil well 66
Between 76 and non magnetic drill collar 73.
Magnetic Sensor 62 is spirally connected with inserting tube 71.Alternatively, being fixedly connected on inserting tube 71 there are one box is closed, Magnetic Sensor 62 is solid
It is fixed to be arranged in closing box；It closes and is provided with sealing ring on the edge of box；It is square or cuboid or cylinder to close box.
It is provided with drilling equipment in second oil well 66.
One end of current source 63 is electrically connected by the first conducting wire with the top of the casing 65 of the first oil well 64；Current source 63
The other end be electrically connected with the earth by the second conducting wire or the other end of current source 63 passes through the second conducting wire and third oil well
The top of casing is electrically connected.
In the present embodiment, specifically, Magnetic Sensor 62 is located in inserting tube 71, wherein inserting tube 71 is located at the second oil well 66
Drill bit 76 and non magnetic drill collar between.
The connection type of Magnetic Sensor 62 and inserting tube 71 can be any one of following manner：It is spirally connected, that is, uses screw
The outer surface of Magnetic Sensor 62 and the inner surface of inserting tube 71 are spirally connected；Either, there are one being fixedly connected in inserting tube 71
Box is closed, Magnetic Sensor 62 is fixed in closing box, also, it is square or cuboid to close box, needs closing
It is provided with sealing ring on the edge of box.
It is provided with drilling equipment in second oil well 66.As it can be seen in figure 9 that carrying out drilling well process to the second oil well 66
When, from ground downwardly direction, it is equipped with drilling rod 72 successively in the second oil well 66, drill collar 73, measurement-while-drilling system 74, visits
Pipe 71, Magnetic Sensor 62, power drilling tool 75, drill bit 76 etc..
Also, it by one end of current source 63, is electrically connected by the top of the first conducting wire and the casing 65 of the first oil well 64
It connects；The other end of current source 63 is electrically connected by the second conducting wire with the earth or the other end of current source 63 is by the
The top of two conducting wires and the casing of third oil well is electrically connected.
In the present embodiment, by input AC electric current in the casing 65 into drilling well, and then by the casing of drilling well 65
Magnetized, then the Magnetic Sensor 62 in positive drilling well gets the amplitude letter of alternating magnetic field produced by the casing 65 of drilling well
Breath, for ground instrument 61 so as to calculate positive drilling well and the distance between drilling well according to the amplitude information, which can
The distance between preferably to symbolize the information of drilling well, and then two adjacent oil wells can be accurately determined out, measure essence
Degree is higher；Scheme provided in this embodiment, can be in the drilling process of positive drilling well, in real time between detection and adjacent oil well
Distance provides an offset well apart from measurement while drilling device and scheme；Also, in the present embodiment, it is only necessary to by current source 63
One end connect with the top of the casing 65 of drilling well, without any tool of tripping in drilling well, to not influencing drilling well
Normal production, and it is provided in this embodiment apart from detection scheme safe operation, conveniently；And use powerful alternating current
Magnetization casing 65 is flowed away, magnetizing field strength can be effectively enhanced, improves ranging distance and precision, is offset well distance measurement and clump
Formula well anticollision provides an effective technological means.
Further, on the basis of Fig. 8 and embodiment illustrated in fig. 9, the distance between the second oil well and the first oil well areWherein, H is the amplitude of alternating magnetic field, and π is pi, and d is pre-determined distance, μ0For vacuum
Magnetic conductivity, μ are the magnetic conductivity of the surrounding formation of the casing 65 of the first oil well 64, and α is the central axis and first of the second oil well 66
Angle between the central axis of the casing 65 of oil well 64, angles of the θ between first straight line and second straight line, first straight line are
The connection straight line between micro- annulus and the location point of Magnetic Sensor 62 on the casing 65 of first oil well 64, second straight line are to pass through
Micro- annulus on the casing 65 of first oil well 64 and be parallel to the second oil well 66 central axis straight line, IlFor the first oil well
Current strength of 64 casing 65 at depth l, and Il=I0e-l/k, k is predetermined coefficient, I0It is current source 63 to the first oil well
The current strength inputted in 64 casing 65, depth l are the micro- annulus and the first oil well 64 on the casing 65 of the first oil well 64
Casing 65 the distance between top.
Ground instrument 61, is specifically used for：When current source 63 is not powered to the casing 65 of the first oil well 64, magnetic sensing is obtained
First magnetic field intensity information of the magnetostatic field that device 62 detects, and Fourier transformation is carried out to the first magnetic field intensity information, it obtains
The first amplitude of magnetostatic field；When current source 63 is powered to the casing 65 of the first oil well 64, obtain what Magnetic Sensor 62 detected
Second magnetic field intensity information, and Fourier transformation is carried out to the second magnetic field intensity information, obtain the second amplitude；Second amplitude is subtracted
First amplitude is gone, the amplitude of alternating magnetic field is obtained.
In the present embodiment, it specifically, above procedure may refer to the step 204-207 of Fig. 2, repeats no more.
Further, on the basis of Fig. 8 and embodiment illustrated in fig. 9, ground instrument 61 is additionally operable to：In N number of current source 63
Each current source 63 into the casing of first oil well corresponding with the current source 63 64 input current so that each first
After the sleeve of oil well 64 is at alternating magnetic field, the alternating magnetic field signal that Magnetic Sensor 62 detects is obtained, wherein different electricity
The frequency for the electric current that stream source 63 is inputted into the casing of the first different oil wells 64 is different, and the number of the first oil well 64 is N number of, N
For the positive integer more than or equal to 2, the first oil well 64 is connect correspondingly with current source 63；Alternating magnetic field signal is carried out
Fourier transformation obtains each 64 corresponding amplitude of the first oil well；According to each 64 corresponding amplitude of the first oil well, determine
Second oil well 66 is respectively the distance between with each the first oil well 64.
In the present embodiment, it specifically, above procedure may refer to each step of Fig. 3, repeats no more.
Further, on the basis of Fig. 8 and embodiment illustrated in fig. 9, ground instrument 61 is electrically connected with current source 63；Ground instrument
61, it is additionally operable to send first control signal to current source 63, not powered to the casing 65 of the first oil well 64 with controlling current source 63,
It is additionally operable to send second control signal to current source 63, be powered to the casing 65 of the first oil well 64 with controlling current source 63.
In the present embodiment, it specifically, above procedure may refer to the step 201-202 of Fig. 2, repeats no more.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.The present invention is directed to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and includes the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claims are pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by appended claims
System.
Claims (10)
1. a kind of oil well determination of distance method, which is characterized in that including：
Current source to the casing of the first oil well power so that first oil well sleeve at alternating magnetic field after, obtain magnetic
The amplitude for the alternating magnetic field that sensor detects, wherein first oil well is the oil for having completed drilling well process
Well, the Magnetic Sensor are fixed in the second oil well, and second oil well is an oil well for carrying out drilling well process,
One end of the current source is electrically connected with the top of the casing of first oil well；The other end of the current source is electrically connected with the earth
Connect or the other end of the current source be electrically connected with the top of the casing of third oil well, the third oil well be another
Through the oil well for completing drilling well process；Wherein, the tie point of the other end of the current source and the earth and the current source it
Between distance be more than or equal to 50 meters；Distance is more than or equal to 50 meters between first oil well and the third oil well；
According to the amplitude, the distance between second oil well and first oil well are determined.
2. according to the method described in claim 1, it is characterized in that, the distance between second oil well and first oil well
ForWherein, H is the amplitude of the alternating magnetic field, and π is pi, μ0For vacuum magnetic conductance
Rate, μ are the magnetic conductivity of the surrounding formation of the casing of first oil well, and α is the central axis and described the of second oil well
Angle between the central axis of the casing of one oil well, angles of the θ between first straight line and second straight line, the first straight line
It is straight for micro- annulus on the casing of first oil well and the connection straight line between the location point of the Magnetic Sensor, described second
Line is micro- annulus on the casing by first oil well and is parallel to the straight line of the central axis of second oil well, Il
For current strength of the casing at depth l of first oil well, and Il=I0e-l/k, k is predetermined coefficient, I0For the electric current
The current strength that source is inputted into the casing of first oil well, depth l are micro- annulus on the casing of first oil well
With the distance between the top of casing of first oil well.
3. according to the method described in claim 1, it is characterized in that, it is described current source to the casing of the first oil well power so that
After the sleeve of first oil well is at alternating magnetic field, the amplitude for the alternating magnetic field that Magnetic Sensor detects, packet are obtained
It includes：
When the current source is not powered to the casing of first oil well, the magnetostatic field that the Magnetic Sensor detects is obtained
The first magnetic field intensity information, and to the first magnetic field intensity information carry out Fourier transformation, obtain the first width of magnetostatic field
Value；
When the current source is powered to the casing of first oil well, it is strong to obtain the second magnetic field that the Magnetic Sensor detects
Information is spent, and Fourier transformation is carried out to the second magnetic field intensity information, obtains the second amplitude；
Second amplitude is subtracted into the first amplitude, obtains the amplitude of the alternating magnetic field.
4. according to the method described in claim 3, it is characterized in that, in the current source not to the casing of first oil well
When power supply, the first magnetic field intensity information that the Magnetic Sensor detects is obtained, including：
First control signal is sent to the current source, current source described in the first control signal characterization control is not to described the
The casing of one oil well is powered, and obtains the first magnetic field intensity information；
When the current source is powered to the casing of first oil well, it is strong to obtain the second magnetic field that the Magnetic Sensor detects
Information is spent, including：
Second control signal is sent to the current source, current source described in the second control signal characterization control is to described first
The casing of oil well is powered, and obtains second amplitude.
5. according to claim 1-4 any one of them methods, which is characterized in that described when the number of the first oil well is N number of
The number of current source is N number of, and N is the positive integer more than or equal to 2, and the first oil well is connect correspondingly with current source, phase
Answer, it is described current source to the casing of the first oil well power so that first oil well sleeve at alternating magnetic field after,
The amplitude for the alternating magnetic field that Magnetic Sensor detects is obtained, including：
Each current source in N number of current source into the casing of the first oil well corresponding with the current source input current so that
After the sleeve of each the first oil well is at alternating magnetic field, the alternating magnetic field signal that Magnetic Sensor detects is obtained, wherein no
The frequency for the electric current that same current source is inputted into the casing of the first different oil wells is different；
Fourier transformation is carried out to the alternating magnetic field signal, obtains the corresponding amplitude of each described first oil well；
Correspondingly, according to the amplitude, the distance between second oil well and first oil well are determined, including：
According to the corresponding amplitude of the first oil well described in each, determine second oil well respectively with the first oil well described in each
The distance between.
6. a kind of oil well determination of distance device, which is characterized in that including：
Ground instrument, Magnetic Sensor and current source；
One end of the current source is electrically connected with the top of the casing of the first oil well, and first oil well, which is one, have been completed to bore
The oil well of well process；The ground instrument is electrically connected with the Magnetic Sensor, and the Magnetic Sensor is fixed in the second oil well,
Second oil well is an oil well for carrying out drilling well process；The other end of the current source is electrically connected with the earth, or
The other end of the current source is electrically connected with the top of the casing of third oil well, and the third oil well is that another has completed to bore
The oil well of well process；Wherein, the distance between the other end of the current source and the tie point of the earth and the current source
More than or equal to 50 meters；Distance is more than or equal to 50 meters between first oil well and the third oil well；
The current source, for powering to the casing of first oil well, so that the sleeve of first oil well is at alternation magnetic
；
The ground instrument, the amplitude for obtaining the alternating magnetic field that the Magnetic Sensor detects, and according to the amplitude,
Determine the distance between second oil well and first oil well.
7. device according to claim 6, which is characterized in that the distance between second oil well and first oil well
ForWherein, H is the amplitude of the alternating magnetic field, and π is pi, μ0For vacuum magnetic conductance
Rate, μ are the magnetic conductivity of the surrounding formation of the casing of first oil well, and α is the central axis and described the of second oil well
Angle between the central axis of the casing of one oil well, angles of the θ between first straight line and second straight line, the first straight line
It is straight for micro- annulus on the casing of first oil well and the connection straight line between the location point of the Magnetic Sensor, described second
Line is micro- annulus on the casing by first oil well and is parallel to the straight line of the central axis of second oil well, Il
For current strength of the casing at depth l of first oil well, and Il=I0e-l/k, k is predetermined coefficient, I0For the electric current
The current strength that source is inputted into the casing of first oil well, depth l are micro- annulus on the casing of first oil well
With the distance between the top of casing of first oil well；
The ground instrument, is specifically used for：
When the current source is not powered to the casing of first oil well, the magnetostatic field that the Magnetic Sensor detects is obtained
The first magnetic field intensity information, and to the first magnetic field intensity information carry out Fourier transformation, obtain the first width of magnetostatic field
Value；
When the current source is powered to the casing of first oil well, it is strong to obtain the second magnetic field that the Magnetic Sensor detects
Information is spent, and Fourier transformation is carried out to the second magnetic field intensity information, obtains the second amplitude；
Second amplitude is subtracted into the first amplitude, obtains the amplitude of the alternating magnetic field.
8. device according to claim 6, which is characterized in that the ground instrument is additionally operable to：
Each current source in N number of current source into the casing of the first oil well corresponding with the current source input current so that
After the sleeve of each the first oil well is at alternating magnetic field, the alternating magnetic field signal that Magnetic Sensor detects is obtained, wherein no
The frequency for the electric current that same current source is inputted into the casing of the first different oil wells is different, and the number of the first oil well is N number of, N
For the positive integer more than or equal to 2, the first oil well is connect correspondingly with current source；
Fourier transformation is carried out to the alternating magnetic field signal, obtains the corresponding amplitude of each described first oil well；
According to the corresponding amplitude of the first oil well described in each, determine second oil well respectively with the first oil well described in each
The distance between.
9. device according to claim 6, which is characterized in that the Magnetic Sensor is located in inserting tube, wherein the inserting tube
Between the drill bit and non magnetic drill collar of second oil well.
10. according to claim 6-9 any one of them devices, which is characterized in that the ground instrument is electrically connected with the current source
It connects；
The ground instrument is additionally operable to send first control signal to the current source, to control the current source not to described the
The casing of one oil well is powered, and is additionally operable to send second control signal to the current source, to control the current source to described the
The casing of one oil well is powered.
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