CN114109366B - Drilling annulus liquid level monitoring method and system - Google Patents
Drilling annulus liquid level monitoring method and system Download PDFInfo
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- CN114109366B CN114109366B CN202111409948.9A CN202111409948A CN114109366B CN 114109366 B CN114109366 B CN 114109366B CN 202111409948 A CN202111409948 A CN 202111409948A CN 114109366 B CN114109366 B CN 114109366B
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- 239000007788 liquid Substances 0.000 title claims abstract description 232
- 238000005553 drilling Methods 0.000 title claims abstract description 61
- 238000012544 monitoring process Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000012530 fluid Substances 0.000 claims abstract description 56
- 238000012545 processing Methods 0.000 claims abstract description 41
- 230000007613 environmental effect Effects 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims 1
- 230000008092 positive effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000012806 monitoring device Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
- E21B47/047—Liquid level
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
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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
- E21B47/10—Locating fluid leaks, intrusions or movements
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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 invention provides a drilling annulus fluid level monitoring method and a system, wherein the drilling annulus fluid level monitoring method comprises the following steps: the liquid level measuring device is arranged on the drill rod element; numbering the liquid level measuring device according to the well entering sequence of the drill rod elements to obtain numbering information; the signal receiving and processing device is arranged outside the drilling shaft; operating when the environmental pressure of the liquid level measuring device is equal to the atmospheric pressure, transmitting the serial number information representing the element of the drill rod where the liquid level measuring device is located and monitoring the serial number information transmitted by other liquid level measuring devices; when the liquid level measuring device monitors the number information transmitted by the liquid level measuring device of the first-in well, the number information of the liquid level measuring device of the first-in well is transmitted; the signal receiving and processing device receives a plurality of groups of serial number information from a plurality of liquid level measuring devices; and when the signal receiving and processing device receives a plurality of groups of serial number information, determining the current annular liquid level position. The invention can quickly determine the liquid level position of the annulus, and has positive effects on timely finding lost circulation and guaranteeing the drilling safety.
Description
Technical Field
The invention belongs to the field of oil and gas resource exploration and development, and particularly relates to a drilling annulus liquid level monitoring method and system.
Background
Lost circulation is a complex situation frequently occurring in the drilling process, and when lost circulation occurs, effective plugging measures must be timely and rapidly applied, so that the loss of drilling fluid is reduced or prevented, and serious accidents such as well collapse, drilling tool burying, well kick, overflow or blowout are avoided. When serious leakage occurs and drilling fluid is lost and returned, the annular drilling fluid liquid level is monitored, the drilling fluid leakage speed is estimated, the nature of the leakage is further judged, the well collapse and the well control risk are estimated, and a basis is provided for optimizing a leakage blocking scheme and quickly blocking a leakage layer besides quick leakage blocking and continuous filling of the drilling fluid into the well. The invention provides a drilling annulus liquid level monitoring method and system, which can monitor the position of the annulus liquid level in real time and provide a drilling liquid leakage speed calculating method.
Currently, existing level monitoring devices typically determine the level of a liquid by calculating the time difference between the emission and reflection of the sound wave. However, the liquid level monitoring device based on sound waves is generally arranged at the end part of a branch line of a ground throttling pipe, is fixedly arranged, cannot be lower than the pressure level of the pipe, and has the advantages of complex structure, large volume and high cost; the sound source is variable cross-section sonic boom, sonic shock wave, infrasonic wave, electric control sound wave and the like, the anti-interference capability is weak, additional operation steps such as stopping drilling, closing a well sealer and the like are needed, the operation period is long, particularly, the liquid level is less in drop, the sound part reflection time is too short, and the liquid level value is difficult to obtain accurately; for a directional well and a highly inclined well, the error of the liquid level position monitoring result is larger.
Disclosure of Invention
The invention aims at: aiming at the problems in the prior art, the method and the system for monitoring the liquid level of the drilling annulus are provided, and the technical problems of complex equipment, limited installation position, complex operation procedure, long measurement period and poor anti-interference capability in the prior art are mainly solved.
The aim of the invention is achieved by the following technical scheme:
a method of monitoring the fluid level in a well annulus comprising the steps of:
step 1, installing a liquid level measuring device on drill rod elements, wherein each drill rod element consists of a drill rod and a drill rod joint;
step 2, numbering the liquid level measuring device according to the well entering sequence of the drill rod elements, and transmitting numbering information representing the drill rod elements where the liquid level measuring device is located when the liquid level measuring device is operated;
step 3, arranging a signal receiving and processing device outside the well drilling shaft;
step 4, when the environmental pressure of the liquid level measuring device is equal to the atmospheric pressure, the liquid level measuring device operates, transmits the number information representing the drill rod element where the liquid level measuring device is positioned, and monitors the number information transmitted by other liquid level measuring devices;
step 5, when the liquid level measuring device in the running state monitors the number information transmitted by the liquid level measuring device of the first-in well, transmitting the number information of the liquid level measuring device of the first-in well;
and 6, the signal receiving and processing device receives a plurality of groups of serial number information from the liquid level measuring devices, and when the serial number information received by the signal receiving and processing device is the same, the liquid level measuring device closest to the liquid level of the annulus can be determined according to the same serial number information, so that the current position of the liquid level of the annulus is determined.
In the technical scheme, when the well drilling is not leaked, the environmental pressure of the liquid level measuring device below the liquid level of the annulus is greater than the atmospheric pressure, and at the moment, the liquid level measuring device below the liquid level of the annulus does not operate. When one or more liquid level measuring devices are exposed out of the annular liquid level, the ambient pressure of the liquid level measuring device above the annular liquid level is atmospheric pressure, at the moment, the liquid level measuring device starts to operate, and serial number information representing the drill rod element where the liquid level measuring device is located is transmitted to the outside, namely, serial number information of the liquid level measuring devices in other operating states and the signal receiving and processing device are transmitted. Wherein each liquid level measuring device corresponds to only one drill rod element, each liquid level measuring device in an operation state also receives the number information transmitted by the other liquid level measuring devices in the operation state when transmitting the number information of the drill rod element corresponding to the liquid level measuring device, and when monitoring the number information transmitted by the other liquid level measuring devices and representing the position closer to the bottom of the well, the liquid level measuring device transmits the number information representing the position closer to the bottom of the well; over time, the number information transmitted by each liquid level measuring device in an operating state tends to be consistent, so that the number information transmitted by each liquid level measuring device received by the signal receiving and processing device tends to be stable, and the signal receiving and processing device can determine the number information of the drill rod element farthest from the wellhead, namely closest to the bottom of the well in real time, so as to determine the real-time position of the annular liquid level.
Further, the method comprises the steps of,
step 7, when the operating liquid level measuring device is at an environmental pressure greater than the atmospheric pressure, the serial number information of the liquid level measuring device is set as a default value;
and 8, stopping the operation of the liquid level measuring device set to a default value.
According to the technical scheme, when no lost circulation occurs in normal drilling or well drilling annulus is full of drilling, the ambient pressure of the liquid level measuring device is greater than the atmospheric pressure, the number information of the liquid level measuring device below the liquid level is restored to be a default value, and then the operation of the liquid level measuring device set to be the default value is stopped.
Preferably, 1-2 level measuring devices are provided on the drill rod element.
Preferably, when 2 liquid level measuring devices are arranged on the rotating rod element, the 2 liquid level measuring devices are connected in parallel.
In the technical scheme, 2 liquid level measuring devices which are connected in parallel are arranged on one drill rod element, so that the 2 liquid level measuring devices are mutually standby, and the stability and the accuracy of the number information transmitted by the liquid level measuring devices are improved.
Further, the method comprises the steps of,
step 9, calculating the distance L between the drill rod element closest to the liquid level measuring device of the annular liquid level and the bottom of the well, wherein n is the number of drill rod elements between the drill rod element closest to the liquid level measuring device of the annular liquid level and the well head, L dp For the length of a drill rod element, i.e. l=n·l dp ；
Step 10, determining the annulus fluid level position L according to the installation position of the fluid level measuring device closest to the fluid level of the annulus top ；
Step 10 of the present embodiment specifically refers to the liquid level position L if the liquid level measuring device is installed at the uppermost portion of the drill pipe top ＝(n-1)·L dp The method comprises the steps of carrying out a first treatment on the surface of the If the liquid level measuring device is installed at the lowest part of the drill rod, the liquid level is at the position L top ＝n·L dp The method comprises the steps of carrying out a first treatment on the surface of the If the liquid level measuring device is arranged in the middle of the drill rod, the liquid level is at the position L top ＝(n-0.5)·L dp Etc. In the technical proposal, the liquid level measuring device in the running state which is nearest to the bottom of the well is determined to emitThe number information is used for determining the well entering sequence of the drill rod elements corresponding to the number information, further determining the number n of the drill rod elements from the drill rod element corresponding to the liquid level measuring device closest to the annular liquid level in the running state to the well drilling mouth, determining the distance L between the drill rod element where the liquid level measuring device closest to the annular liquid level is located and the well drilling bottom based on the same length of each drill rod element, and determining the position of the liquid level measuring device on the drill rod element based on the determination of the liquid level, thereby determining the annular liquid level position L top 。
Further, the method comprises the steps of,
step 12, calculating the time difference of the signal receiving and processing device to be deltat when receiving the serial number information transmitted by the adjacent liquid level measuring device;
step 13, calculating the annular volume V between two adjacent level measuring devices, wherein L i-1,i R is the distance between two adjacent liquid level measuring devices 1 To drill the radius of the well bore, r 2 Is the radius of the outer surface of the drill rod, and thus, the annular volume V between two adjacent liquid level measuring devices is:
V＝π·L i-1,i ·(r 1 2 -r 2 2 )；
step 14, calculating the leak rate Δq: Δq=v/Δt.
According to the technical scheme, the liquid level monitoring system transmits electromagnetic wave signals through the monitoring bottom hole liquid level measuring device, the number information of the bottom hole liquid level measuring device at the lowest end can be obtained in real time, the annular liquid level position can be rapidly determined, the annular liquid level descending speed can be obtained according to the time difference of the number change of the bottom hole liquid level measuring device, and then the drilling fluid leakage speed can be obtained. The system is based on electromagnetic wave signal transmission, has high speed, no delay and strong anti-interference capability; the liquid level measuring device is triggered by the pressure sensor, runs fully automatically, does not need manual intervention, does not need extra operation steps, and has high monitoring efficiency; the liquid level position and the drilling fluid leakage speed are obtained by calculation through received determination signals, and the monitoring result is reliable and accurate regardless of the well type and the liquid level position; the signal receiving and processing device is arranged at the open position of the wellhead on the ground, has no special requirements, is simple to operate and has no interference to a drilling system.
Based on the drilling annulus fluid level monitoring method, a drilling annulus fluid level monitoring system is also provided.
The device comprises a liquid level measuring device arranged on a drill rod element and a signal receiving and processing device arranged on a well drilling wellhead;
the liquid level measuring device consists of a pressure sensing module, a singlechip, an electromagnetic wave receiving and transmitting module and a power supply module; the pressure sensing module is electrically connected with the singlechip, the singlechip is electrically connected with the electromagnetic wave receiving and transmitting module, and the singlechip is electrically connected with the power supply module. The single chip microcomputer receives signals from the pressure sensing module and transmits serial number information represented by the liquid level measuring device to the electromagnetic wave receiving and transmitting module; the electromagnetic wave receiving and transmitting module transmits the serial number information representing the electromagnetic wave receiving and transmitting module to other liquid level measuring devices and signal receiving and processing devices, and also receives the serial number information from other liquid level measuring devices and transmits the serial number information to the singlechip.
The singlechip stores and compares a first number field and a second number field, wherein the first number field is invariable self-number information, and the second number field is variable position number information. The variable position number information refers to number information transmitted by other liquid level measuring devices, and the singlechip compares the first number field with the second number field and transmits the number information closer to the annular liquid level to the electromagnetic wave receiving and transmitting module.
The signal receiving and processing device is composed of a wireless receiving end and a second singlechip. The wireless receiving end receives a plurality of serial number information from a plurality of liquid level measuring devices and transmits the serial number information to a second singlechip; and the second singlechip outputs result information to display equipment for display according to a set algorithm.
According to the technical scheme, the pressure sensing module entering the well is always in an operation state, the environmental pressure of the liquid level measuring device is monitored in real time, when the pressure sensing module monitors that the environmental pressure is at the atmospheric pressure, the single chip microcomputer and the electromagnetic wave receiving and transmitting module start to operate, wherein the electromagnetic wave receiving and transmitting module transmits initial number information representing a drill rod element where the electromagnetic wave receiving and transmitting module is located to other electromagnetic wave receiving and transmitting modules in the operation state and simultaneously receives the number information transmitted by the electromagnetic wave receiving and transmitting module in the operation state and transmits the received number information to the single chip microcomputer, the single chip microcomputer compares the initial number information with the number information from the electromagnetic wave receiving and transmitting module, and the single chip microcomputer transmits the number information transmitted by the electromagnetic wave receiving and transmitting module representing the liquid level measuring device in the operation state which is farthest from a wellhead in real time, namely closest to the annular liquid level, so that the number information transmitted by the liquid level measuring devices in the operation state tend to be consistent with time, and the number information received by the signal receiving and processing device tend to be stable. In order to ensure the stability and accuracy of the number information received by the signal receiving and processing device, the signal receiving and processing device transmits the received number information to the second singlechip for processing, the second singlechip stores the number information of the drill rod element farthest from the well head in real time, and the time for receiving the number information is stored.
The beneficial effects of the invention are as follows:
1. the system is based on electromagnetic wave signal transmission, has high speed, no delay and strong anti-interference capability;
2. the liquid level measuring device is triggered by the pressure sensor, runs fully automatically, does not need manual intervention, does not need extra operation steps, and has high monitoring efficiency;
3. the liquid level position and the drilling fluid leakage speed are obtained by calculation through received determination signals, and the monitoring result is reliable and accurate regardless of the well type and the liquid level position;
4. the signal receiving and processing device is arranged at the open position of the wellhead on the ground, has no special requirements, is simple to operate and has no interference to a drilling system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope of the formulae, and other related drawings can be obtained according to these drawings without the need of inventiveness for a person skilled in the art.
FIG. 1 is a flow chart of a first embodiment of a method of monitoring fluid level in a well annulus according to the present invention;
FIG. 2 is a flow chart of a second embodiment of a method of monitoring fluid level in a well annulus according to the present invention;
FIG. 3 is a flow chart of a third embodiment of a method of monitoring fluid level in a well annulus according to the present invention;
FIG. 4 is a flow chart of a fourth embodiment of a method of monitoring fluid level in a well annulus according to the present invention;
FIG. 5 is a schematic illustration of the installation of a well annulus fluid level monitoring apparatus of the present invention;
FIG. 6 is a schematic diagram of a fluid level measurement device of the well annulus fluid level monitoring system of the present invention;
FIG. 7 is a block diagram of a signal receiving and processing device of the well annulus fluid level monitoring system of the present invention;
FIG. 8 is a schematic diagram of the overall connection of a well annulus fluid level monitoring system of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Example 1
Referring to fig. 1 and 5, a method for monitoring the fluid level in a drilling annulus is disclosed, wherein a plurality of fluid level measuring devices and a plurality of drill rod elements are required to be prepared before monitoring, and the drill rod elements are shown in fig. 5 and consist of drill rods and drill rod joints. The length of the drill rod element is measured and the drill rod element is numbered prior to entry into the well.
In this embodiment, the method for monitoring the fluid level in the drilling annulus includes steps S1 to S6, which are specifically as follows:
s1, a liquid level measuring device is arranged on a drill rod element;
s2, numbering the liquid level measuring device according to the well entering sequence of the drill rod elements, and transmitting numbering information representing the drill rod elements where the liquid level measuring device is located when the liquid level measuring device is operated;
preferably, the liquid level measuring devices are numbered sequentially from small to large according to the well logging sequence of the drill rod elements where the liquid level measuring devices are located, each liquid level measuring device corresponds to one drill rod element, and each liquid level measuring device is preset with numbering information corresponding to the corresponding number of the drill rod element before logging into the well; preferably, the fluid level measuring device is mounted at the bottom of the drill rod element, i.e. the fluid level measuring device is located at the lower part of the drill rod joint;
preferably, at least 2 liquid level measuring devices are installed on the drill rod element, the at least 2 liquid level measuring devices are connected in parallel, and at this point, at least 2 liquid level measuring devices connected in parallel are arranged on one drill rod element, so that the 2 liquid level measuring devices are mutually standby, and stability and accuracy of the number information transmitted by the liquid level monitoring device are improved.
S3, the signal receiving and processing device is arranged outside the drilling shaft; the signal receiving and processing device is used for receiving the number information transmitted by the liquid level measuring devices.
S4, consisting of S401 and S402 in order: s401, monitoring the environmental pressure P of the liquid level measuring device in real time i The method comprises the steps of carrying out a first treatment on the surface of the S402, judging whether Pi is equal to the atmospheric pressure P Atmospheric pressure Equal.
When P i Greater than P Atmospheric pressure When the liquid level measuring device is below the drilling liquid level, repeating S401; when P i Equal to P Atmospheric pressure When it is indicated that the level measuring device has been exposed from the drilling fluid level, at which point the level is measuredThe measuring device starts to operate, transmits its own initial number information and monitors the number information transmitted by the other level measuring devices, and then starts to execute S5.
And S5, when the liquid level measuring device in the running state monitors the number information transmitted by the liquid level measuring device of the first-in well, transmitting the number information of the liquid level measuring device of the first-in well. In this embodiment, the numbers are arranged from smaller to larger according to the sequence of entering the well of the drilling rod element, so the number of the drilling rod element far from the well head is smaller, and thus the initial number information preset by the liquid level measuring device arranged on the drilling rod element is smaller.
Therefore, when the initial number information is smaller than the number information transmitted by other liquid level monitoring devices, the liquid level measuring device which transmits the initial number information is indicated to be positioned on the drill rod element closest to the liquid level of the drilling annulus, and at the moment, the liquid level measuring device continues to transmit the initial number information; when the initial number information is larger than the number information transmitted by other liquid level monitoring devices, the drill rod element where the liquid level measuring device transmitting the initial number information is located is not nearest to the annular drilling liquid level, and at the moment, the liquid level measuring device transmits the number information transmitted by the other liquid level monitoring devices.
S6, the signal receiving and processing device receives a plurality of groups of serial number information from each liquid level measuring device; over time, the serial number information transmitted by each liquid level measuring device in the running state tends to be consistent, so that the serial number information transmitted by each liquid level measuring device received by the signal receiving and processing device tends to be stable, and the serial number of the drill rod farthest from the wellhead is determined in real time to determine the real-time position of the annular liquid level.
Example two
Referring to fig. 1, 2 and 5, another method flow diagram of a method of drilling annulus fluid level monitoring is shown.
The present embodiment proposes another embodiment based on the first embodiment, and the difference between the present embodiment and the first embodiment is specifically as follows:
s7, when the operating environment pressure of the liquid level measuring device is greater than the atmospheric pressure, the number information of the liquid level measuring device is set as a default value;
s8, stopping the operation of the liquid level measuring device set to a default value.
In this embodiment, when no lost circulation occurs in normal drilling or the drilling annulus is filled with drilling fluid, the ambient pressure at which the fluid level measuring device is located is greater than atmospheric pressure, the number information of the fluid level measuring device below the fluid level is restored to a default value, and then the fluid level measuring device set to the default value is stopped.
Example III
Referring again to fig. 1, 2, 3 and 5, a further method flow diagram of a method of well annulus fluid level monitoring is shown.
The present embodiment is another embodiment presented on the basis of the first embodiment and the second embodiment, and the difference between the present embodiment and the first embodiment and the second embodiment is that:
s9, calculating the distance from the liquid level of the drilling annulus to the drilling wellhead as L, wherein n is the number of drill rod elements between the drill rod element corresponding to the liquid level measuring device closest to the liquid level of the annulus and the drilling wellhead, and L dp For the length of one drill rod element: l=n·l dp ；
S10, determining the liquid level position L according to the installation position of the liquid level measuring device closest to the liquid level of the annulus top 。 p If the liquid level measuring device is arranged at the uppermost part of the drill rod, the liquid level is at the position L top ＝(n-1)·L dp The method comprises the steps of carrying out a first treatment on the surface of the Is arranged at the lowest part of the drill rod, L top ＝n·L dp The method comprises the steps of carrying out a first treatment on the surface of the Is arranged in the middle of the drill rod, L top ＝(n-0.5)·L dp Etc.
In this embodiment, the number information transmitted by the fluid level measuring device in the running state closest to the bottom of the well is determined, so as to determine the well entering sequence of the drill pipe elements corresponding to the number information, further determine the number n of drill pipe elements between the drill pipe elements corresponding to the fluid level measuring device in the running state closest to the annular fluid level and the well mouth, and determine the distance between the drill pipe element in the fluid level measuring device closest to the annular fluid level and the bottom of the well based on the same length of each drill pipe elementL, determining the annulus fluid level L based on determining the position of the fluid level measurement mounted on the drill pipe element top 。
Example IV
Referring again to fig. 1, 2, 4 and 5, a further method flow diagram of a method of well annulus fluid level monitoring is shown.
The present embodiment is another embodiment presented on the basis of the first embodiment and the second embodiment, and the difference between the present embodiment and the first embodiment and the second embodiment is that:
s11, calculating a time difference delta t of the signal receiving and processing device receiving two adjacent numbered information;
s12, calculating the annular volume V between two adjacent liquid level measuring devices, wherein L i-1,i R is the distance between two adjacent liquid level measuring devices 1 For the radius of the well bore, r 2 Is the radius of the drill pipe, so that the annular volume V between two adjacent level measuring devices is: v=pi·l i-1,i ·(r 1 2 -r 2 2 )；
S13, calculating the leakage speed delta Q: Δq=v/Δt.
Through the embodiment, the liquid level position of the well drilling annulus in the leakage state and the leakage speed thereof can be monitored in real time.
Example five
Referring to fig. 5-8, based on the drilling annulus fluid level monitoring method according to the first to fourth embodiments, the present embodiment provides a monitoring system applying any of the above annulus fluid level monitoring methods.
The device comprises a liquid level measuring device 100 arranged on a drill rod element and a signal receiving and processing device 200 arranged on a wellhead;
the liquid level measuring device 100 is composed of a pressure sensing module 101, a singlechip 102, a power supply module 103 and an electromagnetic wave receiving and transmitting module 104; the pressure sensing module 101 is connected with the singlechip 102, the singlechip 102 is connected with the electromagnetic wave receiving and transmitting module 104, and the singlechip 102 is connected with the power supply module 103; the singlechip 102 receives the signal from the pressure sensing module 101 and transmits initial number information represented by the liquid level measuring device to the electromagnetic wave receiving and transmitting module 104; the electromagnetic wave transceiver module 104 transmits initial number information representing itself to other liquid level measuring devices 100 and the signal receiving and processing device 200, and also receives number information from other liquid level measuring devices 100 and transmits the number information to the single chip microcomputer 102.
The singlechip 102 stores and compares a first number field and a second number field, wherein the first number field is invariable self-number information, and the second number field is variable position number information. The variable position number information refers to the number information transmitted by other liquid level measuring devices 100, and the singlechip 102 compares the first number field with the second number field and transmits the number information closer to the annular liquid level to the electromagnetic wave transceiver module 104. Specifically, the numbers of the liquid level measuring devices 100 are ordered from small to large according to the well entry sequence of the drill rod elements, the number of the liquid level measuring devices 100 which are closer to the bottom of the well is smaller, at this time, if the number information of the first number field of one liquid level measuring device 100 is smaller than or equal to the position number information of the second number field, that is, the liquid level measuring device 100 is the liquid level measuring device which is closest to the annular liquid level, the number information of the second number field is changed into the number information of the first number field, and the number information is transmitted to the electromagnetic wave receiving and transmitting module 104; if the number information of the first number field of the liquid level measuring device 100 is larger than the position number information of the second number field, the liquid level measuring device 100 is still in an operating state below the bottom of the well, and at this time, the number information of the second number field is transmitted to the electromagnetic wave receiving and transmitting module 104.
The signal receiving and processing device 200 is composed of a wireless receiving end 201 and a second singlechip 202. The wireless receiving end 201 receives a plurality of serial numbers from a plurality of the liquid level measuring devices 100 and transmits the serial numbers to the second singlechip 202; the second singlechip 202 outputs the result information to the display terminal for display according to a set algorithm.
In this embodiment, the pressure sensing module 101 of the logging in the well is always in an operation state, the environmental pressure of the liquid level measuring device 100 is monitored in real time, when the pressure sensing module 101 monitors that the environmental pressure is at atmospheric pressure, the single chip microcomputer 102 and the electromagnetic wave transceiver module 104 start to operate, wherein the electromagnetic wave transceiver module 104 transmits initial number information representing the drill pipe element where the electromagnetic wave transceiver module 104 is located to other electromagnetic wave transceiver modules 104 in the operation state and the signal receiving and processing device 200, meanwhile, the electromagnetic wave transceiver module 104 receives the number information transmitted by the electromagnetic wave transceiver module 104 in the other operation states and transmits the received number information to the single chip microcomputer 102, the single chip microcomputer 102 compares the initial number information with the number information transmitted by the electromagnetic wave transceiver module 104, and the number information transmitted by the electromagnetic wave transceiver module 104 representing the liquid level measuring device 100 in the operation state furthest away from the wellhead in real time is transmitted to the electromagnetic wave transceiver module 104, so that the number information transmitted by the liquid level measuring devices 100 in the operation states in each operation state tends to be consistent with the lapse of time, and the number information received by the signal receiving and processing device 200 tends to be stable. In order to ensure the stability and accuracy of the serial number information received by the signal receiving and processing device 200, the signal receiving and processing device 200 transmits the received serial number information to the second singlechip 202 for processing, the serial number information of the drill rod element farthest from the well head of the well is stored by the second singlechip 202 in real time, and the time for receiving the serial number information is stored.
Thereby guaranteeing the long-time operation of the well annulus liquid level monitoring system of the embodiment.
The hardware devices of the pressure sensing module 101 in this embodiment are pressure sensors that can be found or purchased in the market, and the single chip microcomputer 102 and the second single chip microcomputer 202 in this embodiment may be specifically STM32, STC89C52, CC2530, etc., and the hardware devices of the power supply module in this embodiment are lithium batteries, button batteries, dry batteries, etc. that are commonly found in the market.
It is noted that the concept of the present invention is not only applied to solve the problem of lost circulation of drilling well, but also applied to the technical field of dynamic liquid level monitoring of petroleum wells and natural gas production wells, and the device and equipment mentioned in the embodiments can be installed on a pipe column such as an oil pipe and the like to monitor by adopting the same method.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A method for monitoring the liquid level of a drilling annulus is characterized by comprising the following steps:
step 1, a liquid level measuring device is arranged on drill rod elements, and each drill rod element consists of a drill rod and a drill rod joint;
step 2, numbering the liquid level measuring device according to the well entering sequence of the drill rod element;
step 3, the signal receiving and processing device is arranged outside the well drilling shaft;
step 4, when the environmental pressure of the liquid level measuring device is equal to the atmospheric pressure, the liquid level measuring device operates, the serial number information representing the drill rod element where the liquid level measuring device is positioned is transmitted, and the serial number information transmitted by other liquid level measuring devices is monitored;
step 5, when the liquid level measuring device in the running state monitors the number information transmitted by the liquid level measuring device of the first-in well, transmitting the number information of the liquid level measuring device of the first-in well;
step 6, the signal receiving and processing device receives a group of number information from each liquid level measuring device, when two numbers in the group of number information received by the signal receiving and processing device are the same, the liquid level measuring device transmitting the group of number information is determined to be the liquid level measuring device closest to the annular liquid level according to the same number information, so that the current annular liquid level position is determined;
step 7, when the operating environment pressure of the liquid level measuring device is greater than the atmospheric pressure, the number information of the liquid level measuring device is set as a default value;
step 8, stopping the operation of the liquid level measuring device set as a default value;
step 9, according to the nearest annular liquid levelIs used for determining the liquid level L by the installation position of the liquid level measuring device top ；
Determining the well entering sequence of drill rod elements corresponding to the number information by determining the number information transmitted by the liquid level measuring device in the running state closest to the well bottom, further determining the number n of drill rod elements between the drill rod elements corresponding to the liquid level measuring device in the running state closest to the annular liquid level and the well mouth, determining the distance L between the drill rod element where the liquid level measuring device closest to the annular liquid level is located and the well bottom of the well based on the same length of each drill rod element, and determining the position of the liquid level measuring device on the drill rod element based on the determination of the liquid level, thereby determining the annular liquid level position L top ；
If the liquid level measuring device is arranged at the uppermost part of the drill rod, the liquid level is at the position L top =（n-1）·L dp The method comprises the steps of carrying out a first treatment on the surface of the If the liquid level measuring device is installed at the lowest part of the drill rod, the liquid level is at the position L top =n·L dp The method comprises the steps of carrying out a first treatment on the surface of the If the liquid level measuring device is arranged in the middle of the drill rod, the liquid level is at the position L top =(n-0.5)·L dp Wherein L is dp Is the length of one drill rod element.
2. A method of monitoring the fluid level in a well annulus as defined in claim 1, wherein: and 1-2 liquid level measuring devices are arranged on the drill rod element.
3. A method of monitoring the fluid level in a well annulus as defined in claim 2, wherein: when 2 liquid level measuring devices are arranged on the drill rod element, the 2 liquid level measuring devices are connected in parallel.
4. The method of drilling annulus fluid level monitoring of claim 1, wherein: also included is a method of manufacturing a semiconductor device,
step 10, calculating the time difference delta t between the consistent number information received by the signal receiving and processing device and the next consistent number information, wherein if the number information is always unchanged, the liquid level is considered to be unchanged;
step 11, calculating a ring between adjacent liquid level measuring devicesEmpty volume V, where L i-1,i R is the distance between adjacent liquid level measuring devices 1 To drill the radius of the well bore, r 2 Is the radius of the outer surface of the drill pipe, and thus, the annular volume V between adjacent level measuring devices is:
V=π·L i-1,i ·(r 1 2 -r 2 2 )；
step 13, calculating the leak rate Δq:
ΔQ=V/Δt。
5. a drilling annulus fluid level monitoring system for implementing a method according to any one of claims 1-4, comprising fluid level measuring means provided on a drill rod element and signal receiving and processing means provided outside the drilling wellbore;
the liquid level measuring device consists of a pressure sensing module, a singlechip, an electromagnetic wave receiving and transmitting module and a power supply module;
the signal receiving and processing device is composed of a wireless receiving end and a second singlechip.
6. A drilling annulus fluid level monitoring system as defined in claim 5, wherein: in the liquid level measuring device described above,
the singlechip receives the signal from the pressure sensing module and transmits the serial number information represented by the liquid level measuring device to the electromagnetic wave receiving and transmitting module;
the electromagnetic wave receiving and transmitting module transmits a first number field representing own number information to other liquid level measuring devices and the signal receiving and processing device, and also receives the number information from the other liquid level measuring devices as a second number field and transmits the second number field to the singlechip;
the power supply module is connected with the singlechip and supplies power to the singlechip.
7. A drilling annulus fluid level monitoring system as defined in claim 6, wherein: the singlechip stores and compares a first number field and a second number field, wherein the first number field is invariable self-number information, and the second number field is variable position number information.
8. A drilling annulus fluid level monitoring system as defined in any of claims 5-7, wherein: in the signal receiving and processing device,
the wireless receiving end receives a plurality of serial number information from a plurality of liquid level measuring devices and transmits the serial number information to a second singlechip;
and the second singlechip outputs result information to display equipment for display according to a set algorithm.
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