CN202970701U - Relief well and accident well communication detection system based on three-electrode system - Google Patents

Abstract

The utility model relates to a relief well and accident well communication detection system based on a three-electrode system. The relief well and accident well communication detection system comprises ground power supply equipment, ground signal acquisition equipment, a ground relief well and accident well communication detection calculating system, an earth surface electrode, an underground three-electrode system and an underground exploring tube; the ground power supply equipment is used for supplying power to the underground three-electrode system, the ground signal acquisition equipment and the ground relief well and accident well communication detection calculating system; and the ground signal acquisition equipment is used for converting a format of received data, sending the data subjected to format conversion into the ground relief well and accident well communication detection calculating system to be calculated, and displaying the data in digital, character and/or graphic manners. The relief well and accident well communication detection system can be used for ensuring that current flowing from a main electrode cannot flow along the well shaft direction of the relief well, and for directly detecting the distance and direction from the well bottom of the relief well to the accident well by adopting the underground three-electrode system as a current signal emission source, so that the accumulative error is avoided; and the relief well and accident well communication detection system is suitable for a working condition that a person cannot get close to the vicinity of the well mouth of the relief well, and can normally work in a deep well.

Description

A kind of relief well based on three electrode systems is communicated with detection system with the accident well

Technical field

The utility model belongs to subterranean resource drilling field of engineering technology, particularly, relates to a kind of relief well based on three electrode systems and is communicated with detection system with the accident well.

Background technology

In recent years, offshore drilling platform oil spill disaster frequent caused serious ecological disaster and extremely bad social influence.Relief well be at sea with the land drilling well in the processing accident method that occurs that Oil/gas Well catches fire or often adopt during gas blowout accident, its basic principle is made a bite directional well near the safety zone the accident well, the track that makes its well track and accident well converges in certain layer position on stratum, with highdensity drilling fluid or cement by relief well input accident well, to reach the purpose of the fire extinguishing of oil (gas) well or uniform blowout.On April 20th, 2010, the deep sea drilling crude oil leakage that blowout causes reaching the several months occurs in Gulf of Mexico well MC252#1, not only makes BP company suffer huge economic loss, and causes serious ecological disaster and social influence.After BP company has adopted the emergency measure of multiple processing draining accident in this accident, finally utilize the pressure test operation of relief well to obtain to process the final victory of draining accident, the relief well technology is subject to extensive concern at home and abroad again.At present, relief well is still the reliable method of thorough solution Leakage.

In the process of boring the deep-well Oil/gas Well, because accident well and relief well can not be only straight well, the well type will be more complicated, and the accurate control of well track is also more difficult.Due to the uncertainty of well track, the accurate detection of relief well and accident well offset well distance and bearing is one of key link of relief well technology success.And generally more dangerous near accident well well head, for the safety of assurance personnel and drilling equipment, the pithead position of relief well is generally even farther apart from accident well pithead position hundreds of rice.For relief well and accident well are intersected, the general more complicated of the well track of relief well, this has also aggravated to be communicated with at needs the uncertainty of position accident well and relief well relative position.At present the Wellspot instrument of external development satisfies the engineering demand that relief well and accident well accurately are communicated with substantially.owing to generally can catching fire or discharging toxic gas near accident well well head, tradition is used for offset well apart from (the Rotating Magnet Ranging System of rotating excitation field guiding distance measurement system of electromagnetic positioning, be called for short RMRS) and electromagnetic guide instrument (Magnetic Guidance Tool, be called for short MGT) etc. prospecting tools can't insert in the accident well, and all measureing equipments of Wellspot steering tool all are placed in relief well, can be in relief well between direct detection relief well and accident well distance with and with respect to the orientation of accident borehole axis line, therefore this instrument can guide relief well and accident well crossing at the well depth place of design, be widely applied in being communicated with of its relief well abroad and accident well.

The Wellspot instrument is a kind of efficient tool that relief well is communicated with the accident well of controlling, and it can be realized and successfully the docking of accident well with various well types according to actual formation situation guiding relief well.When the accident well was oil/gas deep well, well track had great uncertainty, and relief well need to be similar to parallel connection with the accident well, and the relief well well type of this moment can be designed to five-part form.But in actual applications, the well depth of some accident well is more shallow, so relief well is nearer apart from well head to the connectivity points of accident well, causes reaching by the relief well of routine the purpose of kill-job.In this case, relief well will need to be communicated with wide-angle with the accident well, even approach to intersect vertically, and the relief well well type of this moment can be designed to five-part form.

At present, the core technology of external designed Wellspot steering tool is still maintained secrecy and is monopolized, and China still lacks further investigation in this respect.Therefore, the special research and design of the utility model person " a kind of relief well based on three electrode systems is communicated with detection system with the accident well ", the utility model adopts down-hole three electrode systems as the current signal emission source, can improve the intensity of current signal emission source, the low-frequency alternating electric current of assembling on greatly increase accident casing, thereby make the inserting tube in relief well larger low frequency alternating magnetic field relatively can be detected, be easy to increase finding range.

The utility model content

For overcoming defects, the utility model provides a kind of relief well based on three electrode systems to be communicated with detection system with the accident well, native system can accurately be measured spacing and the orientation of relief well and accident well within the specific limits, for relief well with accurate connection of accident well provide a kind of effective detection and control device.

For achieving the above object, the utility model adopts following scheme:

Relief well based on three electrode systems is communicated with detection system with the accident well, comprising: surface power supply equipment, ground signal collecting device, ground relief well are communicated with the accident well surveys computing system, Surface electrode, down-hole three electrode systems, underground probe; Surface power supply equipment is positioned near the relief well well head, is used to down-hole three electrode systems that the low-frequency alternating electric current is provided, and is also simultaneously that ground signal collecting device and ground relief well are communicated with detection calculating system power supply with the accident well; Surface electrode be connected with the wellhead casing pipe of relief well and contact good, the output of surface power supply equipment is connected with down-hole three electrode systems, input is connected with Surface electrode; Underground probe is used for surveying gravitational field, the earth's magnetic field at underground probe place and the low frequency alternating magnetic field that is produced by the low-frequency alternating electric current of assembling on the accident casing, the ground signal collecting device is connected with underground probe by logging cable, and receives the data that underground probe detected, reached by logging cable ground; The ground signal collecting device sends to the ground relief well after with the data conversion format that receives and is communicated with the accident well to survey in computing system and calculates, obtain underground probe in relief well and the relative tertiary location data of accident casing, show in the mode of numeral, word and/or figure.

Preferably, surface power supply equipment comprises 380V AC power, step-up transformer, AC/DC converter and frequency controller; At first the output of 380V AC power passes through step-up transformer, step-up transformer rises to 1000V with the voltage that the 380V AC power provides, after the AC/DC converter, convert the high direct voltage of 1000V to, make down-hole three electrode system outputs can reach the electric current that amplitude is 20A, utilize the Single-chip Controlling frequency controller to make its high pressure with 1000V convert the alternation square-wave voltage of 0.25Hz frequency to, then this alternation square-wave voltage is sent to three electrode system places, down-hole and does again output further; The input of 380V AC power is connected with Surface electrode.

Preferably, down-hole three electrode systems comprise electrode system cable interface, electrode system metal shell, two bucking electrodes, two insulating trips and main electrode; Down-hole three electrode systems are connected with seven core cable by the electrode system cable interface; Two bucking electrodes and main electrode are cylinder, and in the middle of main electrode was positioned at, length was 0.15m, and two bucking electrodes are arranged in the upper and lower both sides of main electrode symmetrically, and the length of bucking electrode is 0.7m, and two bucking electrodes are connected by short-circuit line in inside; Separate with insulating trip between bucking electrode and main electrode, the thickness of insulating trip is 0.025m; The diameter of two bucking electrodes, two insulating trips and main electrode is identical.

Preferably, the amplitude that surface power supply equipment provides is that 1000V, frequency are that the alternation square-wave voltage of 0.25Hz is sent to the output that is divided into the two-way identical polar behind three electrode system places, down-hole, wherein one the tunnel keeps voltage constant output directly to supply with main electrode, and another road is through supplying with two bucking electrodes after voltage-regulation.

Preferably, underground probe comprise inserting tube without magnetic shell, metal without magnetic support, cable interface circuit board, sensor signal processing circuit plate, three axis fluxgate sensors, 3-axis acceleration sensor and inserting tube cable interface; Cable interface circuit board, sensor signal processing circuit plate, three axis fluxgate sensors and 3-axis acceleration sensor be installed in inserting tube without the metal in the magnetic shell without in the magnetic support; Inserting tube is hermetically-sealed construction without the magnetic shell; Underground probe is connected with logging cable by the inserting tube cable interface, and utilizes insulating cord to be connected with down-hole three electrode systems, and the data that logging cable is used for underground probe is detected are sent to the ground signal collecting device; Three axis fluxgate sensors in underground probe are used for surveying the resultant magnetic field numerical value of the low frequency alternating magnetic field that the low-frequency alternating electric current assembled on the three axle earth's magnetic fields at underground probe place and accident casing produces, and are used for determining spacing and the orientation of underground probe and accident casing; 3-axis acceleration sensor is used for surveying the three axle acceleration of gravity numerical value at underground probe place, is used for determining the placing attitude of underground probe self; The three-axle magnetic field data that the 3-axis acceleration data that 3-axis acceleration sensor detects and three axis fluxgate sensors detect are sent on logging cable by the cable interface circuit board by the sensor signal processing circuit plate.

Preferably, the ground signal collecting device comprises power circuit, cable interface circuit and cable signal decoding circuit; Power circuit is used for providing power supply to cable interface circuit and cable signal decoding circuit; The cable interface circuit is connected with logging cable, convert the high pressure data-signal that transmits on logging cable to low-voltage signal, then send the cable signal decoding circuit to, the Data Analysis that underground probe is sent by the cable signal decoding circuit out is transferred to the ground relief well by USB interface and is communicated with the detection computing system with the accident well.

Preferably, the ground relief well is communicated with the detection computing system and comprises that relief well is communicated with detection analysis software for calculation and ground display system with the accident well with the accident well, the ground relief well is communicated with the accident well surveys the down-hole image data that the computing system utilization receives, be communicated with the detection analysis software for calculation by relief well with the accident well, obtain inserting tube in relief well and the relative tertiary location data of accident casing, utilize ground display system to show in the mode of numeral, word and/or figure, feed back to the drilling engineer, instruct further creeping into of relief well.

Preferably, Surface electrode is the rectangle metal derby;

Preferably, down-hole three electrode systems and underground probe are at least at a distance of 30m.

A kind of method that relief well is communicated with the accident well is communicated with detection system based on the relief well of above-mentioned three electrode systems with the accident well, and concrete steps are as follows:

Step 1: the hole condition information of extracting relief well and accident well: the casing programme of the brill dish level of the mouth coordinate of the well track metrical information of relief well and accident well 6, relief well and accident well, relief well and accident well and EGL, accident well;

Step 2: process the relief well of extraction and the hole condition information of accident well, obtain the deviational survey data that relief well has bored part and accident well;

Step 3: utilize seven core cable that down-hole three electrode systems and underground probe are sent to by drilling rod or crawl device equipment the bottom that relief well has bored part, surface power supply equipment provides the low-frequency alternating electric current for down-hole three electrode systems;

Step 4: ground signal collecting device reception inserting tube is that detect, data reached ground by logging cable, is communicated with the accident well in the detection computing system sending to the ground relief well after Data Format Transform;

Step 5: utilize hole condition information, the underground probe of relief well after above-mentioned processing and accident well image data, work as the geomagnetic declination, be communicated with the accident well by the ground relief well and survey computing system, obtain underground probe in relief well and the relative tertiary location data of accident casing, utilize ground display system to show in the mode of numeral, word and/or figure;

Step 6: after the relief well and accident well relative tertiary location data that obtain this measuring point place, down-hole three electrode systems and underground probe are proposed, be lowered to drill bit and drilling rod, in conjunction with the deviational survey data of relief well and accident well, continue to creep into relief well to next measuring point place;

Step 7: at this measuring point place, propose drill bit and drilling rod, repeat above-mentioned step 1 to step 6, until relief well accurately is communicated with the accident well.

Relief well based on three electrode systems of the present utility model is communicated with detection system with the accident well and has the following advantages:

1, being communicated with detection system with the accident well based on the relief well of three electrode systems adopts down-hole three electrode systems as the current signal emission source, assurance can not flowed along relief well borehole axis direction from the electric current that main electrode flows out, then make more electric current flow into the stratum assembles on the accident casing, thereby make the inserting tube in relief well larger low frequency alternating magnetic field relatively can be detected, the intensity that simultaneously is communicated with the detectable signal of detection system with the accident well based on the relief well of three electrode systems also can be controlled by the mode of increase earth's surface current strength, therefore be easy to increase finding range, going for deep-well is communicated with,

2, based on the relief well of three electrode systems be communicated with the accident well detection system can the direct detection relief well shaft bottom to the distance and bearing of accident well, avoided traditional MWD to produce the defective of accumulated error with well depth;

3, the current signal emission source (down-hole three electrode systems) and the signal sensor (underground probe) that are communicated with detection system with the accident well based on the relief well of three electrode systems all are put in relief well, therefore be applicable to can't be close near accident well well head operating mode.

4, because the relief well based on three electrode systems is communicated with the sensor that does not comprise very high degree of precision in the underground probe of detection system with the accident well, its limit of working temperature can reach 200 ℃, so this detection system can work in deep-well.

Description of drawings

The relief well that Fig. 1 is based on three electrode systems is communicated with the structural representation of detection system with the accident well;

Fig. 2 is the structural representation of surface power supply equipment;

Fig. 3 is the structural representation of down-hole three electrode systems;

Fig. 4 is the structural representation of underground probe;

Fig. 5 is the internal circuit schematic diagram of underground probe;

Fig. 6 is the structural representation of ground signal collecting device;

Fig. 7 is columnar electrode electric Field Calculation model;

Fig. 8 is that the accident casing injects the response schematic diagram of the electric current on stratum to down-hole three electrode systems;

Fig. 9 is relief well and accident well relative position computation model;

in figure: 1, surface power supply equipment, 2, the ground signal collecting device, 3, the ground relief well is communicated with the accident well surveys computing system, 4, Surface electrode, 5, relief well, 6, the accident well, 7, down-hole three electrode systems, 8, underground probe, 9, the low-frequency alternating electric current, 10, alternating magnetic field, 11, seven core cable, 12, insulating cord, 13, logging cable, 14, the electrode system cable interface, 15, the electrode system metal shell, 16, bucking electrode, 17, insulating trip, 18, main electrode, 19, inserting tube is without the magnetic shell, 20, metal is without the magnetic support, 21, the cable interface circuit board, 22, the sensor signal processing circuit plate, 23, three axis fluxgate sensors, 24, 3-axis acceleration sensor, 25, the inserting tube cable interface.

The specific embodiment

as shown in Figure 1, relief well based on three electrode systems is communicated with detection system with the accident well, comprising: surface power supply equipment 1, ground signal collecting device 2, ground relief well are communicated with the accident well surveys computing system 3, Surface electrode 4, down-hole three electrode systems 7, underground probe 8, surface power supply equipment 1 is positioned near relief well 5 well heads, is used to down-hole three electrode systems that the low-frequency alternating electric current is provided, and is also simultaneously that ground signal collecting device 2 and ground relief well are communicated with 3 power supplies of detection computing system with the accident well, Surface electrode 4 is the rectangle metal derby, be connected with the wellhead casing pipe of relief well 5 and contact good, the output of surface power supply equipment 1 is connected with down-hole three electrode systems, input is connected with Surface electrode 1, and surface power supply equipment 1 utilizes seven core cable 11 to pass into the low-frequency alternating electric current for down-hole three electrode systems 7, Surface electrode 4 is used for receiving by down-hole three electrode systems 7 and injects behind the stratum at the electric current that upwards flows of assembling on accident well 6 sleeve pipes and the part electric current that injected the stratum, do not assembled on accident well 6 sleeve pipes by down-hole three electrode systems 7, in order to form current loop, being lowered to the position and will guaranteeing do not have sleeve pipe to be lowered to of down-hole three electrode systems 7, thereby down-hole three electrode systems 7 are directly contacted with relief well 5 boreholes wall, so that in stratum around the electric current injecting electrode that receives system, this electric current spherical in shape dispersing in the stratum, having simultaneously the part electric current assembles on accident well 6 sleeve pipes, formation makes progress along sleeve pipe, the low-frequency alternating electric current 9 that flows downward, according to Biot-Savart law, this low-frequency alternating electric current 9 will produce low frequency alternating magnetic field 10 in stratum around accident well 6 sleeve pipes, because the magnetic field that the electric current that upwards flows produces is opposite with the magnetic direction that the electric current that flows downward produces, therefore there is negative function in the magnetic field that the electric current that upwards flows produces to the field signal that underground probe 8 detects, for fear of the upwards impact of streaming current, require down-hole three electrode systems 7 and underground probe 8 at least at a distance of 30m, be connected with insulating cord 12 between underground probe 8 and down-hole three electrode systems 7, and underground probe 8 will be lowered to the bottom of relief well 5 as far as possible, simultaneously the magnetic field intensity that produces at underground probe 8 places of the low-frequency alternating electric current of three electrode system 7 positions, down-hole own is zero, therefore the not impact of Weak magentic-field signal of underground probe 8 being surveyed, underground probe 8 is used for surveying gravitational field, the earth's magnetic field at underground probe 8 places and the low frequency alternating magnetic field 10 that is produced by the low-frequency alternating electric current 9 of assembling on accident well 6 sleeve pipes, require underground probe 8 necessary static when measuring, otherwise the rotation of underground probe 8 or vibrations will cause it can't accurately detect faint field signal, ground signal collecting device 2 is connected with underground probe 8 by logging cable 13, and receives the data that underground probe 8 detected, reached by logging cable 13 ground, ground signal collecting device 2 sends to the ground relief well after with the data conversion format that receives and is communicated with the accident well to survey in computing system 3 and calculates, obtain the relative tertiary location data of underground probe 8 and accident well 6 sleeve pipes in relief well 5, show in the mode of numeral, word and/or figure.

As shown in Figure 2, surface power supply equipment comprises 380V AC power, step-up transformer, AC/DC converter and frequency controller; At first the output of 380V AC power passes through step-up transformer, step-up transformer rises to 1000V with the voltage that the 380V AC power provides, after the AC/DC converter, convert the high direct voltage of 1000V to, make down-hole three electrode system 7 outputs can reach the electric current that amplitude is 20A, utilize the Single-chip Controlling frequency controller to make its high pressure with 1000V convert the alternation square-wave voltage of 0.25Hz frequency to, then this alternation square-wave voltage is sent to three electrode system 7 places, down-hole and does again output further; The input of 380V AC power is connected with Surface electrode.

As shown in Figure 3, three electrode systems 7 relief well that is based on three electrode systems in down-hole is communicated with the current signal emission source of detection system with the accident well; Down-hole three electrode systems 7 comprise electrode system cable interface 14, electrode system metal shell 15, two bucking electrodes 16, two insulating trips 17 and main electrode 18; Down-hole three electrode systems 7 are connected with seven core cable 11 by electrode system cable interface 14; Two bucking electrodes 16 and main electrode 18 are cylinder, in the middle of main electrode 18 was positioned at, length was 0.15m, and two bucking electrodes 16 are arranged in the upper and lower both sides of main electrode 18 symmetrically, the length of bucking electrode 16 is 0.7m, and two bucking electrodes 16 are connected by short-circuit line in inside; Separate with insulating trip 17 between bucking electrode 16 and main electrode 18, the thickness of insulating trip is 0.025m; Two bucking electrodes 16, two insulating trips 17 are identical with the diameter of main electrode 18.as shown in Figure 2, the amplitude that surface power supply equipment provides is 1000V, frequency is that the alternation square-wave voltage of 0.25Hz is sent to the output that is divided into the two-way identical polar behind three electrode system 7 places, down-hole, wherein one the tunnel keeps voltage constant output directly to supply with main electrode 18, another road is through supplying with two bucking electrodes 16 after voltage-regulation, make three current potentials on electrode be tending towards equal, at this moment along the down-hole three electrode systems 7 longitudinally electric potential gradient be zero, thereby guarantee can not flow along the borehole axis direction from the electric current that main electrode 18 flows out, guarantee that more electric current flows into the stratum and then assembles on accident well 6 sleeve pipes.

As Fig. 4, shown in Figure 5, underground probe 8 comprise inserting tube without magnetic shell 19, metal without magnetic support 20, cable interface circuit board 21, sensor signal processing circuit plate 22, three axis fluxgate sensors 23,3-axis acceleration sensor 24 and inserting tube cable interface 25; Cable interface circuit board 21, sensor signal processing circuit plate 22, three axis fluxgate sensors 23 and 3-axis acceleration sensor 24 be installed in inserting tube without the metal in magnetic shell 19 without in magnetic support 20; Inserting tube is hermetically-sealed construction without magnetic shell 19, prevents that underground probe 8 surrounding liquids from entering inserting tube, affects circuit working; Underground probe 8 is connected with logging cable 13 by inserting tube cable interface 25, and utilizes insulating cord 12 to be connected with down-hole three electrode systems 7, and the data that logging cable is used for inserting tube is detected are sent to the ground signal collecting device; Three axis fluxgate sensors 23 and the z axle of 3-axis acceleration sensor 24 and the dead in line of underground probe 8 in underground probe 8, x axle and y axle are perpendicular to the axis of underground probe 8; The x axle of two sensors is positioned on same plane, and parallel to each other, and the y axle of two sensors also is positioned on same plane, and is also parallel to each other; Three axis fluxgate sensors 23 in underground probe 8 are used for surveying the resultant magnetic field numerical value of the low frequency alternating magnetic field 10 that the low-frequency alternating electric current 9 assembled on the three axle earth's magnetic fields at underground probe 8 places and accident well 6 sleeve pipes produces, and are used for determining spacing and the orientation of underground probe 8 and accident well 6 sleeve pipes; 3-axis acceleration sensor 24 is used for surveying the three axle acceleration of gravity numerical value at underground probe 8 places, be used for to determine the placing attitude of underground probe 8 self; The three-axle magnetic field data that the 3-axis acceleration data that 3-axis acceleration sensor 24 detects and three axis fluxgate sensors 23 detect are sent on logging cable 13 by cable interface circuit board 21 by sensor signal processing circuit plate 22.The certainty of measurement of three axis fluxgate sensors 23 reaches 0.01nT, and the certainty of measurement of 3-axis acceleration sensor 24 reaches 0.01g.

As shown in Figure 6, ground signal collecting device 2 comprises power circuit, cable interface circuit and cable signal decoding circuit; Power circuit is used for providing power supply to cable interface circuit and cable signal decoding circuit; The cable interface circuit is connected with logging cable 13, convert the high pressure data-signal of transmission on logging cable 13 to low-voltage signal, then send the cable signal decoding circuit to, the Data Analysis that underground probe 8 is sent by the cable signal decoding circuit out is transferred to the ground relief well by USB interface and is communicated with detection computing system 3 with the accident well.The ground relief well is communicated with detection computing system 3 and comprises that relief well is communicated with detection analysis software for calculation and ground display system with the accident well with the accident well, the ground relief well is communicated with the accident well surveys the down-hole image data that computing system 3 utilizations receive, be communicated with the detection analysis software for calculation by relief well with the accident well, obtain inserting tube in relief well 5 and the relative tertiary location data of accident well 6 sleeve pipes, utilize ground display system to show in the mode of numeral, word and/or figure, feed back to the drilling engineer, instruct further creeping into of relief well.

Be communicated with the detection system operating principle based on the relief well of three electrode systems and accident well as follows: as shown in Figure 7, down-hole three electrode systems 7 are approximately the line electrode of naked ring, current density j evenly distributes; Down-hole three electrode system 7 total lengths are 2L ₀, main electrode 18 total lengths are 2L, down-hole three electrode system 7 radiuses are r ₀, and satisfy r ₀＜＜L ₀It is σ that down-hole three electrode systems 7 are positioned at electrical conductivity _eEven stratum in.The mid point of getting down-hole three electrode systems 7 is the origin of coordinates, simultaneously the dead in line of Z axis and down-hole three electrode systems 7.Field intensity apart from initial point l place when z=0 is

$E(l,0)=\frac{I_0}{4\mathrm{\&pi;}{\mathrm{\&sigma;}}_{e}L}\frac{L_0}{\mathrm{<figure-callout\; id="2"\; label="l\; l"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">l</figure-callout>}\sqrt{l^{}}\sqrt{{}^2+{L_0}^2}}$

As shown in Figure 8, for the long metal sleeve of semo-infinite that is surrounded by even stratum at three electrode system 7R places, distance down-hole, the electric current of assembling on it is

$I_{\mathrm{\&rho;}}=\frac{{\mathrm{\&sigma;}}_c{r}_c{h}_c{I}_0}{2{\mathrm{\&sigma;}}_{e}L}\frac{L_0}{\mathrm{<figure-callout\; id="2"\; label="R\; R"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">R</figure-callout>}\sqrt{R^{}}\sqrt{{}^2+L_0^2}}$

Under the prerequisite that satisfies following three assumed conditions: 1) stratum homogeneous isotropism; 2) sleeve pipe endless; 3) radius of sleeve pipe in the relief well 5 down-hole three electrode systems 7 and the distance between accident well 6 casing axis, accident well 6 sleeve pipes are r by radius _eThe stratum cylinder substitute, the resistance of this cylinder unit length is identical with accident well 6 sleeve pipes, this stratum cylinder radius is expressed as

$r_e=\sqrt{\frac{2{\mathrm{\&sigma;}}_c}{{\mathrm{\&sigma;}}_e}{r}_c{h}_c}$

To layer cylinder radius r approx _eBring into to such an extent that the electric current assembled on accident well 6 sleeve pipes is

$I_{\mathrm{\&rho;}}=\frac{r_e^2{I}_0}{4R\sqrt{R^2+L_0^2}}\frac{L_0}{L}$

Three electrode systems 7 are the origin of coordinates to the mirror position of accident well 6 sleeve pipes take the down-hole, set up cylindrical coordinate take the axis of accident well 6 sleeve pipes as the z axle.Low-frequency alternating electric current 9 along casing axis z place is

$I\left(z\right)=\frac{L}{L_0}\frac{z/R}{[1+{(z/R)}^2{]}^{3/2}}{I}_{\mathrm{\&rho;}}=\frac{z/R}{[1+{(z/R)}^2{]}^{3/2}}\&CenterDot;\frac{{\mathrm{<figure-callout\; id="2"\; label="r\; e"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">r</figure-callout>}}_e^{}}{4\mathrm{<figure-callout\; id="2"\; label="R\; R"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">R</figure-callout>}\sqrt{R^{}}\sqrt{{}^2+L_0^2}}{I}_0$

Suppose that Electrodes In Shallow Wells is 7 position A points and underground probe 8 position B points in same vertical plane, the distance between A, B is d.Well depth, hole angle that known A, B are ordered are respectively D _A, D _B, α _A, α _B, the inclination section radius of curvature is R _z, the average hole angle of surveying section is

With season

$\left\{\begin{array}{c}{R}_z=\frac{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">d</figure-callout>}}{2\sin {\mathrm{\&alpha;}}_d}\\ R=r+d\sin {\mathrm{\&alpha;}}_c\\ z=d\cos {\mathrm{\&alpha;}}_c\end{array}\right.$

The electric current I that flows downward (z) of therefore assembling on accident well 6 sleeve pipes and underground probe 8 to the pass between accident well 6 cover tube pitch r are

$I\left(z\right)=\frac{d\cos {\mathrm{\&alpha;}}_c(r+d\sin {\mathrm{\&alpha;}}_c)}{{({\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">r</figure-callout>}}^2+2\mathrm{rd}\sin {\mathrm{\&alpha;}}_c+d^2)}^{3/2}[{(r+d\sin {\mathrm{\&alpha;}}_c)}^2+L_0^2{]}^{1/2}}\&CenterDot;\frac{r_e^2{T}_0}{4}$

According to Biot-Savart law, the magnetic field intensity of the low frequency alternating magnetic field 10 at underground probe 8 places is

$H=\frac{d\cos {\mathrm{\&alpha;}}_c(r+d\sin {\mathrm{\&alpha;}}_c)}{{({\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">r</figure-callout>}}^2+2\mathrm{rd}\sin {\mathrm{\&alpha;}}_c+d^2)}^{3/2}[{(r+d\sin {\mathrm{\&alpha;}}_c)}^2+L_0^2{]}^{1/2}}\&CenterDot;\frac{{\mathrm{\&mu;}}_0{r}_e^2{T}_0}{8\mathrm{\&pi;r}}$

Thereby, after recording the magnetic field intensity of underground probe 8 places by the alternating magnetic field 10 of low-frequency alternating electric current 9 generations on accident well 6 sleeve pipes, utilize magnetic field intensity H and apart from the inversely prroportional relationship between r, can obtain theoretically the distance between accident well 6 sleeve pipes and relief well 5 underground probes 8.

As shown in Figure 9, be relief well 5 and accident well 6 relative position computation models.Be n along accident well 6 axis drilling directions ₁, be n along underground probe 8 axis drilling directions ₂, H is the magnetic field intensity of the low frequency alternating magnetic field 10 that electric current I produces at underground probe 8 places in accident well 6 sleeve pipes, H three axis fluxgate sensor 23x axles and y axle magnetic-field component in the plane be projected as H _p, this component is respectively H along three axis fluxgate sensor 23x axles and the axial component of y ₁And H ₂, and satisfy

H _dFor H along the axial magnetic-field component of z; H and vector r are positioned at same plane, and n ₂Perpendicular to this plane.Can get thus

H＝H _p+H _d

H _d＝-(H _p·n ₁)/(n ₁·n ₂)

r/(r·r)＝(2π)(H×n ₁)/μ ₀I

Therefore work as H _pAfter being recorded by three axis fluxgate sensors 23, the substitution following formula just can be determined H and r uniquely, thereby also just determines the spacing of relief well 5 and accident well 6.

Simultaneously, the gravitational vectors at 3-axis acceleration sensor 24 measured underground probe 8 places is perpendicular to the component G of z axle _pBe respectively G at 3-axis acceleration sensor 24x axle and the axial component of y ₁And G ₂, and satisfy

Angle α is component G _pWith x axle component G ₁Between angle, angle β is component G _pWith H _pBetween angle.As shown in Figure 9, cos (alpha+beta)=H ₁/ H _p, sin (alpha+beta)=H ₂/ H _p, cos α=G ₁/ G _p, sin α=G ₂/ G _p, the cosine of deriving thus angle β can be expressed as

$\cos \mathrm{\&beta;}=\frac{G_1{H}_1+G_2{H}_2}{G_1^2+{\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">G</figure-callout>}}_2^2}\&CenterDot;\frac{\sqrt{G_1^2+{\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">G</figure-callout>}}_2^2}}{\sqrt{H_1^2+{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="HSA00000808166400041.png"\; state="\{\{state\}\}">H</figure-callout>}}_2^2}}$

Therefore, the H that three axis fluxgate sensors 23 and 3-axis acceleration sensor 24 is recorded ₁, H ₂, G ₁And G ₂The substitution following formula just can be tried to achieve angle β, thereby has also just determined the relative bearing of relief well 5 to accident well 6.

A kind of method that relief well is communicated with the accident well is communicated with detection system based on the relief well of above-mentioned three electrode systems with the accident well, and concrete steps are as follows:

Step 1: the hole condition information of extracting relief well 5 and accident well 6; The well track metrical information of relief well 5 and accident well 6; The mouth coordinate of relief well 5 and accident well 6; Brill dish level (KB) and the EGL (GL) of relief well 5 and accident well 6; The casing programme of accident well 6;

Step 2: process the hole condition information of relief well 5 with the accident well 6 of extraction, obtain the deviational survey data that relief well has bored part and accident well;

Step 3: utilize seven core cable 11 that down-hole three electrode systems 7 and underground probe 8 are sent to by drilling rod or crawl device equipment the bottom that relief well has bored part, surface power supply equipment 1 provides the low-frequency alternating electric current for down-hole three electrode systems 7;

Step 4: ground signal collecting device 2 receives the data that inserting tube 8 is that detect, reached ground by logging cable 13, is communicated with the accident well in detection computing system 3 sending to the ground relief well after Data Format Transform;

Step 5: utilize hole condition information, the underground probe 8 of relief well 5 and accident well 6 after above-mentioned processing image data, work as the geomagnetic declination, be communicated with the accident well by the ground relief well and survey computing system 3, obtain the relative tertiary location data of underground probe 8 and accident well 6 sleeve pipes in relief well 5, utilize ground display system to show in the mode of numeral, word and/or figure;

Step 6: after the relief well and accident well relative tertiary location data that obtain this measuring point place, down-hole three electrode systems 7 and underground probe 8 are proposed, be lowered to drill bit and drilling rod, in conjunction with relief well and accident well the deviational survey data, continue to creep into relief well to next measuring point place;

Step 7: at this measuring point place, propose drill bit and drilling rod, repeat above-mentioned step 1 to step 6, until relief well accurately is communicated with the accident well.

Claims (8)

1. the relief well based on three electrode systems is communicated with detection system with the accident well, comprising: surface power supply equipment, ground signal collecting device, ground relief well are communicated with the accident well surveys computing system, Surface electrode, down-hole three electrode systems, underground probe; It is characterized in that: surface power supply equipment is positioned near the relief well well head; Surface electrode be connected with the wellhead casing pipe of relief well and contact good, the output of surface power supply equipment is connected with down-hole three electrode systems, input is connected with Surface electrode, the ground signal collecting device is connected with underground probe by logging cable, and receives the data that underground probe detected, reached by logging cable ground.

2. the relief well based on three electrode systems according to claim 1 is communicated with detection system with the accident well, and it is characterized in that: surface power supply equipment comprises 380V AC power, step-up transformer, AC/DC converter and frequency controller; At first the output of 380V AC power passes through step-up transformer, step-up transformer rises to 1000V with the voltage that the 380V AC power provides, after the AC/DC converter, convert the high direct voltage of 1000V to, make down-hole three electrode system outputs can reach the electric current that amplitude is 20A, utilize the Single-chip Controlling frequency controller to make its high pressure with 1000V convert the alternation square-wave voltage of 0.25Hz frequency to, then this alternation square-wave voltage is sent to three electrode system places, down-hole and does again output further; The input of 380V AC power is connected with Surface electrode.

3. the relief well based on three electrode systems according to claim 1 is communicated with detection system with the accident well, it is characterized in that: down-hole three electrode systems comprise electrode system cable interface, electrode system metal shell, two bucking electrodes, two insulating trips and main electrode; Down-hole three electrode systems are connected with seven core cable by the electrode system cable interface; Two bucking electrodes and main electrode are cylinder, and in the middle of main electrode was positioned at, length was 0.15m, and two bucking electrodes are arranged in the upper and lower both sides of main electrode symmetrically, and the length of bucking electrode is 0.7m, and two bucking electrodes are connected by short-circuit line in inside; Separate with insulating trip between bucking electrode and main electrode, the thickness of insulating trip is 0.025m; The diameter of two bucking electrodes, two insulating trips and main electrode is identical.

4. the relief well based on three electrode systems according to claim 1 is communicated with detection system with the accident well, it is characterized in that: the amplitude that surface power supply equipment provides is that 1000V, frequency are that the alternation square-wave voltage of 0.25Hz is sent to the output that is divided into the two-way identical polar behind three electrode system places, down-hole, wherein one the tunnel keeps voltage constant output directly to supply with main electrode, and another road is through supplying with two bucking electrodes after voltage-regulation.

5. the relief well based on three electrode systems according to claim 1 is communicated with detection system with the accident well, it is characterized in that: underground probe comprise inserting tube without magnetic shell, metal without magnetic support, cable interface circuit board, sensor signal processing circuit plate, three axis fluxgate sensors, 3-axis acceleration sensor and inserting tube cable interface; Cable interface circuit board, sensor signal processing circuit plate, three axis fluxgate sensors and 3-axis acceleration sensor be installed in inserting tube without the metal in the magnetic shell without in the magnetic support; Inserting tube is hermetically-sealed construction without the magnetic shell; Underground probe is connected with logging cable by the inserting tube cable interface, and utilizes insulating cord to be connected with down-hole three electrode systems, and the data that logging cable is used for underground probe is detected are sent to the ground signal collecting device; Three axis fluxgate sensors in underground probe are used for surveying the resultant magnetic field numerical value of the low frequency alternating magnetic field that the low-frequency alternating electric current assembled on the three axle earth's magnetic fields at underground probe place and accident casing produces, and are used for determining spacing and the orientation of underground probe and accident casing; 3-axis acceleration sensor is used for surveying the three axle acceleration of gravity numerical value at underground probe place, is used for determining the placing attitude of underground probe self; The three-axle magnetic field data that the 3-axis acceleration data that 3-axis acceleration sensor detects and three axis fluxgate sensors detect are sent on logging cable by the cable interface circuit board by the sensor signal processing circuit plate.

6. the relief well based on three electrode systems according to claim 1 is communicated with detection system with the accident well, and it is characterized in that: the ground signal collecting device comprises power circuit, cable interface circuit and cable signal decoding circuit; Power circuit is used for providing power supply to cable interface circuit and cable signal decoding circuit; The cable interface circuit is connected with logging cable, convert the high pressure data-signal that transmits on logging cable to low-voltage signal, then send the cable signal decoding circuit to, the Data Analysis that underground probe is sent by the cable signal decoding circuit out is transferred to the ground relief well by USB interface and is communicated with the detection computing system with the accident well.

7. the relief well based on three electrode systems according to claim 1 is communicated with detection system with the accident well, and it is characterized in that: Surface electrode is the rectangle metal derby.

8. the relief well based on three electrode systems according to claim 1 is communicated with detection system with the accident well, it is characterized in that: down-hole three electrode systems and underground probe are at least at a distance of 30m.

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