Coiled tubing downhole operation tool wireless positioning method

Abstract

The present application relates to a kind of coiled tubing downhole operation tool wireless positioning method, comprising the following steps: S1, ground induction system is pumped with coiled tubing truck pressure sensor;S2, check the battery and function of positioner, ensure that the function of positioner is normal before entering well;S4, ground real-time monitoring, observe the contrast of the depth of lowering and the pressure pulse generated, check whether there is casing collar missed identification when positioner is lowered through casing collar;S5, after the positioner tool completes positioning, increase the displacement and pump pressure of pump, until the lower valve body pin of positioner tool is cut off, the lower valve body is opened, while bypass is closed, lower positioner is lifted, when observing that there is no pulse in the tubing, the lower valve body is opened, and tool string can carry out normal cyclic operation;S6, after work is completed, positioner is removed, electromagnetic signal reading is read, battery is replaced, and tool is maintained.The present application can realize positioning to tool depth by wireless mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shale gas exploitation, and more particularly, to a wireless positioning method for a coiled tubing downhole operation tool. BACKGROUND

[0002] At present, coiled tubing trucks are widely used in fracturing, testing and well repair operations, and some of the operations require accurate positioning of the depth of the tool lowered into the well. At present, the coiled tubing truck usually uses a coiled tubing lowering length depth recorder to check the depth, and the coiled tubing is often in a buckled state when extending in the horizontal section, and the positioning depth often has an error with the actual depth of the tubing lowering. The check based on the depth of the coiled tubing lowering can meet the requirements of some conventional operations, but cannot meet the precise requirements of some operations requiring accurate positioning, such as layer reconstruction of closely spaced oil and gas layers, which may affect oil and gas evaluation and production effect.

[0003] At present, the commonly used tools requiring accurate positioning are cable type positioning tools, but there are few cable devices at present, the construction cost is high, and there are also technical problems in the circulation and sealing of the coiled tubing operation device with a cable passing through the coiled tubing. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a wireless positioning method for a coiled tubing downhole operation tool, which can realize positioning of the tool depth in a wireless manner.

[0005] The technical scheme adopted by the present application to solve the technical problem is that a wireless positioning method for a coiled tubing downhole operation tool is constructed, comprising the following steps:

[0006] S1, connecting the ground induction system with the coiled tubing truck pump pressure sensor and the depth encoder, to ensure that the ground system can be connected to the pump pressure and depth signal of the coiled tubing;

[0007] S2, checking the battery and function of the positioner to ensure that the function of the positioner is normal before entering the well, setting the working time of the positioner before entering the well, and setting the casing thickness identification threshold;

[0008] S3, connecting the positioner to the tool string, and lowering at a speed of 15 m / min, while pumping clean water at a displacement of 200-350 L / min;

[0009] S4, real-time monitoring on the ground, observing the comparison between the lowering depth and the generated pressure pulse, checking whether the positioner has casing collar leakage identification when passing through the casing collar, and if not, continuing to lower the positioning tool at a speed of 20-25 m / min; until the short casing, accurately positioning the position of the short casing;

[0010] S5, after the locator tool completes positioning, increase the displacement and pump pressure of the pump until the lower valve body pin of the locator tool is sheared off, the lower valve body is opened, the bypass is closed, the locator is lifted up and lowered down, and the lower valve body is opened when no pulse is observed in the oil pipe, and the tool string can perform normal circulation operation;

[0011] S6, after the work is completed, the locator is taken out, the storage electromagnetic signal is read, the battery is replaced, and the tool is maintained.

[0012] According to the above scheme, the ground induction system needs to be connected to the continuous oil pipe internal pump pressure, the continuous oil pipe internal pump pressure is monitored, the signal of the identified coupling is processed according to the pulse signal generated by the locator, the ground induction system records the casing information of the well in advance, and the depth of the locator is accurately calculated according to the casing information recognized by the locator.

[0013] According to the above scheme, the continuous oil pipe depth encoder is connected in advance, the depth of the continuous oil pipe is recorded, the depth data is corrected after the coupling is recognized, and accurate depth information is obtained.

[0014] According to the above scheme, when accurate positioning of the downhole tool string is needed, the pump is started at a distance of 300-500 m from the downhole preset short casing, clean water is pumped into the continuous pipe at a displacement of 200-350 L / min, the electromagnetic induction module of the locator generates a magnetic field change every time it passes through a casing coupling, an indication signal is given to the two-position three-way electromagnetic valve through signal conversion, the electromagnetic valve plunger performs a periodic switching action in a set time, then a short-term pressurization-depressurization process is formed on the upper part of the piston valve body, the piston valve body performs a reciprocating action, a 3-5 second closed state is formed at the slide valve port, and then it is opened; due to the continuous pumping of clean water in the continuous pipe, a pressure pulse is formed during the 3-5 second closed state and then the opening of the slide valve port; the ground data acquisition system converts the pressure pulse signal into an "electrocardiogram" type curve after collecting it, and records the number of couplings passed by the downhole tool through the recording curve "peak"; the ground data processing system accurately positions the tool through comprehensive analysis of the original position data of the casing coupling, the continuous pipe lifting speed, and the data of the continuous pipe depth recorder.

[0015] According to the above scheme, the locator includes an electromagnetic induction module, a signal control module, an electromagnetic valve body module and a bottom valve body arranged in the outer cylinder, the locator electromagnetic induction module includes an electromagnetic induction coil and an electromagnetic induction transmission, the signal control module includes a signal processing unit and an electromagnetic valve control unit, the signal processing unit is used for identifying and processing the electromagnetic induction signal, and the electromagnetic valve control unit is used for converting the judgment signal into the action of the electromagnetic valve body.

[0016] According to the scheme, the electromagnetic valve module comprises an electromagnetic valve body, a piston valve body and a supporting spring, the electromagnetic valve body is a pilot valve of the piston valve body, the electromagnetic valve body is a two-position three-way valve body, the electromagnetic valve body connects the flow channels inside and outside the oil pipe, and is used for controlling the flow channels to change the state of the lower piston valve body; in the initial state, the piston valve body bears the annular space pressure on both sides, and keeps the upper position under the action of the supporting spring, at this time, the bypass flow channel is in the open state; when the electromagnetic valve body receives a signal and changes the position in a short time, the electromagnetic valve body controls the flow channels to change, the pressure on the upper part of the piston valve body becomes the pressure inside the oil pipe, at this time, the pressure difference is generated on both ends of the piston valve body, the pressure difference overcomes the action force of the supporting spring and makes the piston valve body move downward, the bypass flow channel of the positioner is closed, and the pressure pulse of the positioner is generated.

[0017] According to the scheme, the lower valve body module comprises a thimble piston, a shear pin, a thimble, a sealing valve plate, a locking sleeve and a supporting torsional spring, in the initial state, the thimble piston and the thimble tightly press the sealing valve plate on the lower step, and the lower flow channel is closed; after the positioner completes the positioning operation, the lower flow channel is opened by using hydraulic pressure, and the bypass flow channel is closed, so that the tool string normally operates; when the lower valve body needs to be opened, only the ground pump displacement and pump pressure need to be increased, at this time, due to the cavity formed by the thimble piston and the outer cylinder, the pressure areas on both ends of the piston are different, when the pressure difference increases to a certain degree, the thimble piston shears the shear pin, the thimble piston moves upward with the thimble, the thimble piston closes the bypass flow channel of the positioner, the thimble retreats after pressing the sealing valve plate, the sealing valve plate is opened under the action of the supporting torsional spring, the completely opened sealing valve plate is fixed by the locking sleeve, and the opening of the flow channel is ensured not to be closed due to the action of fluid.

[0018] The continuous oil pipe downhole operation tool wireless positioning method has the following beneficial effects:

[0019] The tool depth is positioned by using the electromagnetic induction recognition of the casing collar to generate a corresponding pulse signal, the tool does not need to be connected with a cable for power supply or signal transmission during operation, fluid can be circulated during operation, there is no protruding positioning piece on the surface of the tool, a casing collar position preset step is not needed, the wellbore integrity is increased, and the risk that the positioner is blocked is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be further described below in combination with the drawings and examples, and the drawings show:

[0021] Figure 1 is a device connection schematic diagram of the operation method of the application;

[0022] Figure 2 is a structural schematic diagram of the positioner;

[0023] Figure 3is a structural schematic diagram of the electromagnetic induction module;

[0024] Figure 4 is a schematic diagram of the electromagnetic valve body module when the flow channel is open;

[0025] Figure 5 is a schematic diagram of the electromagnetic valve body module when the flow channel is closed to generate a pulse state;

[0026] Figure 6 is a schematic diagram when the lower valve body module is open in a self-locking state;

[0027] Figure 7 is a schematic diagram when the lower valve body module is open in a self-locking state;

[0028] In the figure, 1 is a shock absorbing spring, 2 is an electromagnetic induction coil, 3 is a buffer pad, 4 is an electromagnetic induction transmission, 5 is a signal processing unit, 6 is an electromagnetic valve control unit, 7 is an electromagnetic valve body, 8 is a positioner outer cylinder, 9 is a piston valve body, 10 is a support spring, 11 is a thimble piston, 12 is a shear pin, 13 is a thimble, 14 is a locking sleeve, 15 is a sealing valve plate, and 16 is a support spring. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0030] The coiled tubing downhole operation tool wireless positioning method of the present application is installed and connected with the positioner as shown in the figure during operation, mainly including depth data acquisition in the coiled tubing truck, pressure data acquisition and tool connection. Figure 1

[0031] Preparation work before the positioner operation:

[0032] The ground system needs to connect and press the inside of the coiled tubing pump, monitor the inside of the coiled tubing pump, and process the signal of the recognized collar according to the pulse signal generated by the positioner.

[0033] The ground system needs to record the casing information of the well in advance, and then accurately calculate the depth of the positioner according to the casing information recognized by the positioner.

[0034] The coiled tubing depth encoder is connected in advance, the depth of the coiled tubing is recorded, which is convenient for subsequent correction of the depth data after the collar is recognized, and accurate depth information is obtained.

[0035] The working steps of the coiled tubing wireless collar positioner device into the well are as follows:

[0036] ​S1, the ground induction system is connected with the coiled tubing truck pump pressure sensor, depth encoder, and the ground system can be connected to the pump pressure and depth signal of the coiled tubing.

[0037] S2, check the locator battery and function, ensure that the locator is normal before entering the well, set the locator working time before entering the well, and set the casing thickness identification threshold.

[0038] S3, the locator is connected to the tool string, and is lowered at a speed of 15 m / min, while pumping 200 L / min of clean water.

[0039] S4, real-time monitoring on the ground, observing the contrast between the lowering depth and the generated pressure pulse, checking whether the locator has casing coupling leakage identification when passing through the casing coupling, if not, continue to lower the positioning tool at a speed of 20-25 m / min. Until the short casing, accurately position the short casing position.

[0040] S5, after the locator tool completes positioning, increase the pump displacement and pump pressure until the lower valve body pin of the locator tool is sheared off, the lower valve body is opened, and the bypass is closed, the locator is raised and lowered, and the lower valve body is opened when there is no pulse in the tubing. The tool string can be normally cycled.

[0041] S6, after the work is completed, the locator is taken out, the stored electromagnetic signal is read, the battery is replaced, and the tool is maintained.

[0042] When the downhole tool string needs to be accurately positioned, the pump is started at a distance of 300-500 m from the preset short casing in the well, and clean water is pumped into the coiled tubing at a displacement of 200-350 L / min. The electromagnetic induction module of the locator generates a magnetic field change every time it passes through a casing coupling. Through signal conversion, a two-way three-way electromagnetic valve receives an indication signal. The electromagnetic valve plunger performs a periodic switching action within a set time, then a short-term pressurization-depressurization process is formed on the upper part of the piston valve body, and the piston valve body performs a reciprocating action, forming a 3-5 second closed state at the spool port, and then opening. Due to the continuous pumping of clean water in the coiled tubing, a pressure pulse is formed during the 3-5 second closed state and then opened at the spool port. After the ground data acquisition system collects the pressure pulse signal, it is converted into an "electrocardiogram" type curve, and the number of coupling through the well tool is recorded by recording the curve "peak". The ground data processing system accurately positions the tool by comprehensively analyzing the casing coupling original position data, the coiled tubing lifting speed, and the data of the coiled tubing depth recorder.

[0043] The present locator is convenient to operate, only needs to observe the casing collar and pressure pulse information in real time during operation, and has high automation degree during operation. After parameters are set before the locator is lowered into the well, the electromagnetic induction module of the locator can automatically identify the casing collar in the well, control the electromagnetic valve to act, so that the pressure pulse is generated in the tubing, the ground system automatically identifies the pressure pulse, and corrects the depth of the locator according to the casing information table, so that the purpose of accurate positioning is achieved. The coiled tubing wireless collar locator device has the advantages that the electromagnetic induction module is storage type, does not need to be connected with a cable for signal transmission. The tool surface does not need to be provided with a protruding positioning piece, and the inner wall of the casing does not need to be provided with a groove, so that the wellbore integrity is increased, and the resistance risk of the locator is effectively reduced.

[0044] As shown in Figures 2-7 , the present operation is adopted by the locator including an electromagnetic induction module, a signal control module, an electromagnetic valve body module, a ground system module and a bottom valve body module.

[0045] The electromagnetic induction module includes an electromagnetic induction coil 2, a damping spring 1, a buffer pad 3 and an electromagnetic induction transmission 4. The entire electromagnetic induction module adopts eccentric design, retains a through hole of a central flow passage of the locator, and the damping spring 1 and the buffer pad 3 are designed on both sides of the electromagnetic induction coil 2, so as to ensure the reliability of the electromagnetic induction module in the locator.

[0046] The control module includes a signal processing unit 5 and an electromagnetic valve control unit 6, and the main function is to identify and process the electromagnetic induction signal, and convert the judgment signal into the action of the electromagnetic valve body 7.

[0047] The electromagnetic valve module includes an electromagnetic valve body 7, a piston valve body 9 and a support spring 10. The electromagnetic valve body 7 is a pilot valve of the piston valve body 9, which is a two-position three-way valve body, is used for connecting the flow passage inside the tubing and the flow passage outside the tubing, and mainly functions to control the flow passage to change the state of the lower piston valve body 9. In the initial state, the piston valve body 9 bears the annular pressure on both sides, and maintains the upper state under the action of the support spring 10. At this time, the bypass flow passage is in the open state. When the electromagnetic valve body 7 receives the signal and changes the position in a short time, the electromagnetic valve body 7 controls the flow passage to change, the pressure on the upper part of the piston valve body 9 becomes the pressure inside the tubing, at this time, the pressure difference is generated on both ends of the piston valve body 9, the pressure difference overcomes the force of the support spring 10, so that the piston valve body 9 moves downward, the bypass flow passage of the locator is closed, and the pressure pulse of the locator is generated.

[0048] The lower valve body module includes a top pin piston 11, a shear pin 12, a top pin 13, a sealing valve plate 15, a locking sleeve 14 and a supporting torsion spring 16. In the initial state, the top pin piston 11 and the top pin 13 tightly press the sealing valve plate 15 against the lower step, and the lower flow passage is closed. After the positioner completes the positioning operation, the lower flow passage can be opened by using hydraulic pressure, and the bypass flow passage is closed at the same time, so that the tool string normally operates. When the lower valve body needs to be opened, only the ground pump displacement and pump pressure need to be increased. At this time, due to the cavity formed by the top pin piston 11 and the outer cylinder, the pressure areas of both ends of the piston are different. When the pressure difference increases to a certain degree, the top pin piston 11 will shear the shear pin 12, and the top pin piston 11 will move upward with the top pin 13. The top pin piston 11 closes the upper bypass flow passage of the positioner. At the same time, the top pin 13 that presses the sealing valve plate 15 retreats, and the sealing valve plate 15 is opened under the action of the supporting torsion spring 16. The completely opened sealing valve plate 15 is fixed by the locking sleeve, so that the flow passage will not be closed due to fluid action when it is opened.

[0049] The ground system module includes a pressure sensing module and a depth recording module. The pressure sensing module is used to detect and record the coiled tubing pump pressure pulse condition, and detect and process the pump pressure signal. When the pressure pulse signal is detected, the downhole depth of the coiled tubing is corrected according to the casing collar information table, and the accurate depth of the positioner is obtained.

[0050] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments. The above specific embodiments are only illustrative, but not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims. These are all within the protection of the present application.

Claims

1. A method for wireless positioning of a coiled tubing downhole service tool, the method comprising: It comprises the following steps: S1, connecting the ground induction system with the coiled tubing truck pump pressure sensor and depth encoder, to ensure that the ground system can be connected to the pump pressure and depth signal of the coiled tubing; S2, checking the locator battery and function, to ensure that the locator is normal before entering the well, setting the working time of the locator before entering the well, and setting the casing thickness identification threshold; S3, connecting the locator into the tool string, and lowering at a speed of 15 m / min, while pumping clean water with a displacement of 200-350 L / min; S4, real-time monitoring on the ground, observing the contrast between the lowering depth and the generated pressure pulse, checking whether the locator has casing coupling leakage identification when passing through the casing coupling, if not, continue to lower the positioning tool at a speed of 20-25 m / min; until the short casing, accurately positioning the short casing position; S5, after the positioning tool completes positioning, increasing the displacement and pump pressure of the pump, until the lower valve body pin of the positioning tool is sheared off, the lower valve body is opened, and the bypass is closed, the locator is pulled up and lowered, and the lower valve body is opened when there is no pulse in the tubing, and the tool string can be normally cycled; S6, after the work is completed, the locator is taken out, the stored electromagnetic signal is read, the battery is replaced, and the tool is maintained; The locator comprises an electromagnetic induction module, a signal control module, an electromagnetic valve body module and a lower valve body arranged in the inner cylinder, the locator electromagnetic induction module comprises an electromagnetic induction coil and an electromagnetic induction transmission, the signal control module comprises a signal processing unit and an electromagnetic valve control unit, the signal processing unit is used for identifying and processing the electromagnetic induction signal, and the electromagnetic valve control unit is used for converting the judgment signal into the action of the electromagnetic valve body; The electromagnetic valve body module comprises an electromagnetic valve body, a piston valve body and a supporting spring, the electromagnetic valve body is a pilot valve of the piston valve body, the electromagnetic valve body structure is a two-position three-way valve body, the electromagnetic valve body connects the flow channels inside and outside the tubing, and is used for controlling the flow channel to change the state of the lower piston valve body; in the initial state, the piston valve body bears the annular space pressure on both sides, and remains in the upper position state under the action of the supporting spring, at this time, the bypass flow channel is in the open state; when the electromagnetic valve body receives the signal and changes the position in a short time, the electromagnetic valve body controls the flow channel to change, the pressure on the upper part of the piston valve body changes into the internal pressure of the tubing, at this time, the pressure difference is generated at both ends of the piston valve body, the pressure difference overcomes the action force of the supporting spring and makes the piston valve body move downward, the bypass flow channel of the locator is closed, and the pressure pulse of the locator is generated.

2. The coiled tubing downhole tool wireless positioning method of claim 1, wherein, The ground induction system needs to connect the internal pump pressure of the coiled tubing, monitor the internal pump pressure of the coiled tubing, process the signal of the identified coupling according to the pulse signal generated by the locator, record the casing information of the well in advance, and accurately calculate the lowering depth of the locator according to the casing information identified by the locator.

3. The coiled tubing downhole tool wireless positioning method of claim 1, wherein, The lowering depth encoder is connected in advance, the lowering depth of the coiled tubing is recorded, the depth data is corrected after the coupling is identified, and accurate depth information is obtained.

4. The coiled tubing downhole tool wireless positioning method of claim 1, wherein, When the downhole tool string needs to be accurately positioned, the pump is started at a distance of 300-500 m from the downhole pre-set short casing, and clean water is pumped into the coiled tubing at a displacement of 200-350 L / min. The electromagnetic induction module of the locator generates a magnetic field change every time it passes a casing collar, which is converted into an indication signal to a two-way three-way electromagnetic valve. The electromagnetic valve plunger performs a periodic switching action within a set time, then a short-term pressurization-depressurization process is formed on the upper part of the piston valve body, and the piston valve body performs a reciprocating action, forming a 3-5 second closed state at the spool port, and then opening; due to the continuous pumping of clean water in the coiled tubing, a pressure pulse is formed during the 3-5 second closed state and then opening of the spool port; the ground data acquisition system converts the pressure pulse signal into an "electrocardiogram" type curve, and records the number of collars passed by the downhole tool through the "peak" of the recorded curve; the ground data processing system accurately positions the tool through comprehensive analysis of the original position data of the casing collar, the coiled tubing running speed, and the data of the coiled tubing depth recorder.

5. The coiled tubing downhole tool wireless positioning method of claim 1, wherein, The lower valve body includes a thimble piston, a shear pin, a thimble, a sealing valve plate, a locking sleeve and a supporting torsional spring. In the initial state, the thimble piston and the thimble tightly press the sealing valve plate on the lower step, closing the lower flow passage. When the locator completes the positioning operation, the lower flow passage is opened using hydraulic pressure, and the bypass flow passage is closed at the same time, so that the tool string operates normally. When the lower valve body needs to be opened, only the ground pump displacement and pump pressure need to be increased. At this time, due to the cavity formed by the thimble piston and the outer cylinder, the pressure areas at both ends of the piston are different. When the pressure difference increases to a certain degree, the thimble piston will shear the shear pin, and the thimble piston moves upward with the thimble. The thimble piston closes the bypass flow passage at the upper part of the locator, and the thimble behind the sealing valve plate retreats. The sealing valve plate is opened under the action of the supporting torsional spring, and the completely opened sealing valve plate is fixed by the locking sleeve, so that the flow passage will not be closed due to fluid action.

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