Bridge eccentric water injection well immobile plug layer-by-layer pressure measuring instrument and testing method

Abstract

The present application relates to the technical field of oilfield production testing, and particularly relates to a bridge eccentric water injection well non-moving packer layered pressure measuring instrument and a testing method. The device comprises: a pressure measuring tool string, the pressure measuring tool string comprises a wireline fishing instrument and a releasable sealing pressure measuring tool, the bottom end of the wireline fishing instrument can be connected to the releasable sealing pressure measuring tool, the outer side of the releasable sealing pressure measuring tool is connected to a bridge eccentric water distributor, a packer is installed inside the bridge eccentric water distributor, and the wireline fishing instrument controls the releasable sealing pressure measuring tool to be set and sealed for pressure measurement, released and fished in the bridge eccentric water distributor. The layered pressure measuring instrument and the testing method provided by the present application carry the releasable sealing pressure measuring tool into the well through the wireline fishing instrument, support the water distributor at the target layer, and then push the wireline fishing instrument motor through ground control to realize setting and sealing and pressure measurement. The wireline fishing instrument pressure monitoring determines the setting condition of the releasable sealing pressure measuring tool, decides to release and test or terminate the test.

Description

Technical Field

[0001] This invention relates to the field of oilfield production testing technology, and in particular to a layered pressure testing instrument and method for a bridge-type eccentric water injection well stationary plug. Background Technology

[0002] Currently, many oilfields use bridge-type eccentric water injection wells for stratified water injection. This ensures that the formation energy meets the needs of oil displacement. Due to the heterogeneous nature of the formation, different water injection volumes are required for different formations. This necessitates stratified pressure testing at the wellhead. Through well test interpretation, parameters such as the actual formation pressure, permeability, skin coefficient, and fracture distance of each stratum can be obtained, providing real formation information for the oilfield's geological personnel.

[0003] Currently, stratified pressure testing in bridge-type eccentric injection wells mainly uses plug-type pressure gauges. This technology has three major problems: First, the on-site testing process is complex, labor-intensive, and inefficient. If the average number of strata in the injection well exceeds five, using plug-type pressure gauges for stratified pressure testing requires four retrieval operations for each test stratum: retrieving the original well plug, deploying the plug-type pressure gauge, testing again, retrieving the plug-type pressure gauge after testing, and reverting the original well plug. Second, plug-type pressure gauges cannot obtain the pressure before the nozzle during injection. Testing can only be done by suspending the gauge in the tubing for a few minutes before deploying the distributor, using the tubing pressure as the pressure before the nozzle. This pressure is not the same as the pressure before the nozzle during normal injection, leading to significant deviations in the interpretation results; it is a last resort. Third, deploying and retrieving plugs and using plug-type pressure gauges in certain high-pressure strata of the injection well can cause formation backflow and unsealing of washable packers, problems that are difficult to resolve using the plug-type pressure gauge stratified pressure testing process. Therefore, in order to address the above shortcomings, a layered pressure testing instrument and testing method for bridge-type eccentric injection well stationary blockage device is proposed. Summary of the Invention

[0004] (a) Technical problems to be solved This invention provides a layered pressure testing instrument and method for non-stationary blockage devices in bridge-type eccentric water injection wells, overcoming the problems of numerous testing steps, large pressure disturbances in water injection wells, high labor intensity, low accuracy of formation parameter information, and low testing efficiency in existing technologies for layered pressure testing of bridge-type eccentric water injection wells.

[0005] (II) Technical Solution To address the above problems, this invention provides a bridge-type eccentric injection well stationary blockage layered pressure testing instrument, comprising: The pressure testing tool string includes a cable retrieval instrument and a removable sealing pressure testing tool. The bottom end of the cable retrieval instrument can be connected to the removable sealing pressure testing tool, which can be seated in a bridge-type eccentric water distributor. A blocker is installed on one side inside the bridge-type eccentric water distributor. The cable retrieval instrument controls the removable sealing pressure testing tool to perform pressure testing, release, and retrieval within the bridge-type eccentric water distributor. The cable retrieval instrument includes a cable head, which is connected to a ground monitoring instrument. The bottom end of the cable head is connected to a centralizer, and the bottom end of the centralizer is connected to a motor assembly. The bottom end of the motor assembly is connected to a lead screw, and the bottom end of the lead screw is connected to a sealing mechanism. The bottom end of the sealing mechanism is connected to a pressure sensor assembly, and the bottom end of the pressure sensor assembly is connected to a locking ball mechanism and a detachable sealing pressure testing tool. The pressure sensor assembly monitors the pressure changes of the detachable sealing pressure testing tool. The locking ball mechanism is connected to the detachable sealing pressure testing tool. The motor assembly transmits and receives signals from the ground monitoring instrument and drives the lead screw to move. The lead screw drives the locking ball mechanism through the sealing mechanism. The removable sealing pressure testing tool includes a pressure guide tube. The top end of the pressure guide tube is connected to a pressure sensor assembly. A retrieval head, a mechanical locking mechanism, a sealing cup assembly, a support arm, a locking cam mechanism, a connector, a dual-channel storage pressure gauge, and a guide cone are connected to the outside of the pressure guide tube. The top end of the retrieval head is connected to a locking ball mechanism. The bottom end of the retrieval head is sequentially connected to the mechanical locking mechanism, the sealing cup assembly, the support arm, the locking cam mechanism, the connector, the dual-channel storage pressure gauge, and the guide cone. The support arm is locked or unlocked by the locking cam mechanism, and the dual-channel storage pressure gauge monitors pressure changes.

[0006] Preferably, the bridge-type eccentric water distributor has a central channel, through which a removable sealing pressure testing tool is installed. One side of the bridge-type eccentric water distributor has an eccentric hole, with an inlet and an outlet at both ends. A plug is installed inside the eccentric hole, and a flow channel is provided inside the plug. The inlet, flow channel, and outlet are connected. A water distributor basket is provided at the bottom of the bridge-type eccentric water distributor.

[0007] Preferably, the top of the cable head is connected to a cable, which is a single-core cable with a diameter of less than 4mm. The cable head is connected to a ground monitoring instrument via the cable, and the cable head transmits power and signals via the cable.

[0008] Preferably, the motor assembly includes a circuit and a motor. The top end of the circuit is connected to a centralizer, the bottom end of the circuit is connected to the motor, and the bottom end of the motor is connected to a lead screw. The circuit transmits and receives signals from the ground monitoring instrument, and the circuit controls the motor to drive the lead screw.

[0009] Preferably, the pressure sensor assembly includes a formation pressure sensor and a tubing pressure sensor, with a sealing mechanism connected to the top of both the formation pressure sensor and the tubing pressure sensor, and the tubing pressure sensor connected to one side of the formation pressure sensor.

[0010] Preferably, the bottom ends of both the formation pressure sensor and the tubing pressure sensor are connected to a locking ball mechanism and a removable sealing pressure testing tool. The removable sealing pressure testing tool monitors changes in formation pressure through the formation pressure sensor, and monitors changes in tubing pressure through the tubing pressure sensor.

[0011] Preferably, the bottom end of the retrieval head is connected to a mechanical locking mechanism, the bottom end of the mechanical locking mechanism is connected to a sealing cup assembly, the bottom end of the sealing cup assembly is connected to a support arm, the bottom end of the support arm is connected to a locking cam mechanism, the bottom end of the locking cam mechanism is a connector, the bottom end of the connector is connected to a dual-channel storage pressure gauge, and the bottom end of the dual-channel storage pressure gauge is a guide cone.

[0012] Preferably, the sealing cup assembly includes an upper sealing cup, a pressure transmission port, and a lower sealing cup. The top of the upper sealing cup is connected to a mechanical locking mechanism, the bottom of the upper sealing cup is connected to the lower sealing cup, the pressure transmission port is located between the upper and lower sealing cups, the pressure transmission port is connected to the liquid inlet and the liquid outlet, and the bottom of the lower sealing cup is connected to a support arm.

[0013] Preferably, the top end of the pressure-conducting tube is connected to the formation pressure sensor and the tubing pressure sensor. After the removable sealing pressure measuring tool is set, the pressure transmission port transmits the formation pressure to the pressure-conducting tube, the pressure-conducting tube transmits the formation pressure to the formation pressure sensor, and the pressure-conducting tube transmits the formation pressure to a dual-channel storage pressure gauge. The dual-channel storage pressure gauge stores the formation pressure data and the tubing pressure data.

[0014] Preferably, the locking cam mechanism includes a locking tongue, the locking cam mechanism is supported on the water distributor basket by a support arm, the locking cam mechanism releases the support arm by flipping, the support arm includes a compression spring, the compression spring supports extension and retraction, and the compression spring releases or retracts the support arm by extension and retraction.

[0015] Preferably, the bottom end of the connector is provided with a pressure gauge connection thread, and the connector is connected to a dual-channel storage pressure gauge through the pressure gauge connection thread. The dual-channel storage pressure gauge is protected by a guide cone.

[0016] This invention also provides a testing method for a layered pressure measuring instrument for stationary plugs in bridge-type eccentric injection wells, comprising: Deploy and retrieve removable sealing pressure testing tools; During deployment, the working schedule of the dual-channel storage pressure gauge is set. The support arm is locked by the locking cam mechanism, and the retrieval head is locked by the locking ball mechanism. The pressure testing tool string is inserted into the wellhead blowout preventer. The guide cone is lowered to 2m below the bridge-type eccentric water distributor in the target formation. The lowering is stopped, and the pressure testing tool string is slowly raised. The guide cone is fully removed from the target formation. The locking cam mechanism releases the support arm, and the pressure testing tool string is lowered again. The support arm is supported in the water distributor basket. The dual-channel storage pressure gauge records the changes in formation pressure and tubing pressure in real time. The tubing pressure before setting is tested. The surface monitoring instrument controls the motor to drive the lead screw push rod to move. The lead screw push rod drives the locking ball mechanism through the sealing mechanism. The locking ball mechanism pushes the upper and lower sealing cups to open and seals the bridge-type eccentric water distributor. The tubing pressure and formation pressure after setting are tested. The tubing pressure and formation pressure are observed through the surface monitoring instrument. The motor is controlled again, and the mechanical locking mechanism locks, completing the unjamming. The tubing pressure after unjamming is observed, and the cable is retrieved to retrieve the instrument. During retrieval, after the stratified pressure testing is completed according to the time limit, the cable retrieval instrument is installed into the wellhead blowout preventer. The cable retrieval instrument is then lowered to the bridge-type eccentric water distributor in the target stratum. The locking ball mechanism captures and locks the retrieval head. The pressure guide pipe is connected to the pressure sensor assembly. The surface monitor detects the formation pressure and tubing pressure in the target stratum. The surface monitor controls the motor to pull the screw push rod. The screw push rod drives the locking ball mechanism through the sealing mechanism. The locking ball mechanism pulls the retrieval head, upper sealing cup, and lower sealing cup back to release pressure. The formation pressure and tubing pressure balance are observed through the surface monitor. The detachable sealing pressure testing tool is then unsealed. The cable is lifted, and the cable retrieval instrument and the detachable sealing pressure testing tool are pulled out.

[0017] Preferably, the unset tubing pressure is the flow pressure when the pressure testing tool string is lowered again; the unset tubing pressure is the value when the tubing pressure reading observed by the ground monitoring instrument is equal to the formation pressure reading; the test time range for the unset tubing pressure is 2-5 minutes. The test time for the set formation pressure is 2-5 minutes; the set formation pressure is the formation pressure reading observed by the ground monitoring instrument; the set tubing pressure is the tubing pressure reading observed by the ground monitoring instrument; the set formation pressure and tubing pressure are not equal. The unloaded tubing pressure is the value when the tubing pressure reading observed by the ground monitoring instrument is equal to the formation pressure reading.

[0018] (III) Beneficial Effects The present invention provides a bridge-type eccentric water injection well stationary plugging device and a testing method for layered pressure testing. A detachable sealing pressure testing tool is carried into the well via a cable-operated retrieval device. After being supported by the bridge-type eccentric water distributor in the target layer, the cable-operated retrieval device is driven by a motor controlled from the ground to achieve setting and pressure testing. Simultaneously, the cable-operated retrieval device can monitor the setting status of the detachable sealing pressure testing tool through pressure monitoring, deciding whether to conduct the detachment test or terminate the test. A dual-channel storage pressure gauge can monitor the tubing pressure under normal water injection conditions in the target layer, improving the quality of layered pressure testing data in water injection wells and interpreting more accurate formation parameter information. Attached Figure Description

[0019] Fig. 1 This is a schematic diagram of the structure of the layered pressure measuring instrument for the bridge-type eccentric injection well stationary plugger according to an embodiment of the present invention; Fig. 2 This is a schematic diagram of the cable retrieval instrument according to an embodiment of the present invention; Fig. 3 This is a schematic diagram of the removable sealing pressure testing tool according to an embodiment of the present invention.

[0020] Legend: 1-Cable head; 2-Center; 3-Circuit circuit; 4-Motor; 5-Screw push rod; 6-Sealing mechanism; 7-Formation pressure sensor; 8-Tube pressure sensor; 9-Locking ball mechanism; 10-Retrieval head; 11-Mechanical locking mechanism; 12-Upper sealing cup; 13-Pressure transmission port; 14-Lower sealing cup; 15-Support arm; 16-Locking cam mechanism; 17-Pressure guide tube; 18-Pressure gauge connection thread; 19-Dual-channel storage pressure gauge; 20-Guide cone; 21-Cable retrieval instrument; 22-Bridge-type eccentric water distributor; 23-Blocker; 24-Inlet; 25-Outlet; 26-Water distributor basket; 27-Releasable sealing pressure measuring tool. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it is necessary to understand that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "top", and "bottom" are based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of this invention and to simplify the description. It is not intended to indicate or imply that the component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0023] like Figs. 1-3 As shown, the present invention provides a bridge-type eccentric injection well stationary blockage layered pressure testing instrument, specifically comprising: The pressure testing tool string includes a cable retrieval instrument 21 and a removable sealing pressure testing tool 27. The bottom end of the cable retrieval instrument 21 can be connected to the removable sealing pressure testing tool 27. The removable sealing pressure testing tool 27 can be seated in a bridge-type eccentric water distributor 22. A blocker 23 is installed on one side inside the bridge-type eccentric water distributor 22. The cable retrieval instrument 21 controls the removable sealing pressure testing tool 27 to test pressure, remove the blockage, and retrieve the cable within the bridge-type eccentric water distributor 22. The cable retrieval instrument 21 includes a cable head 1, which is connected to a ground monitoring instrument. A centralizer 2 is connected to the bottom of the cable head 1. A motor assembly is connected to the bottom of the centralizer 2. A lead screw 5 is connected to the bottom of the motor assembly. A sealing mechanism 6 is connected to the bottom of the lead screw 5. A pressure sensor assembly is connected to the bottom of the sealing mechanism 6. A locking ball mechanism 9 and a detachable sealing pressure testing tool 27 are connected to the bottom of the pressure sensor assembly. The pressure sensor assembly monitors the pressure changes of the detachable sealing pressure testing tool 27. The locking ball mechanism 9 is connected to the detachable sealing pressure testing tool 27. The motor assembly transmits and receives signals from the ground monitoring instrument. The motor assembly drives the lead screw 5 to move. The lead screw 5 drives the locking ball mechanism 9 through the sealing mechanism 6. The removable sealing pressure measuring tool 27 includes a pressure guide tube 17. The top end of the pressure guide tube 17 is connected to a pressure sensor assembly. A retrieval head 10, a mechanical locking mechanism 11, a sealing cup assembly, a support arm 15, a locking cam mechanism 16, a connector, a dual-channel storage pressure gauge 19, and a guide cone 20 are connected to the outside of the pressure guide tube 17. The top end of the retrieval head 10 is connected to a locking ball mechanism 9. The bottom end of the retrieval head 10 is sequentially connected to the mechanical locking mechanism 11, the sealing cup assembly, the support arm 15, the locking cam mechanism 16, the connector, the dual-channel storage pressure gauge 19, and the guide cone 20. The support arm 15 is locked or unlocked by the locking cam mechanism 16, and the dual-channel storage pressure gauge 19 monitors pressure changes.

[0024] In this stratified pressure measuring instrument, the bridge-type eccentric water distributor 22 is provided with a central channel. The bridge-type eccentric water distributor 22 is equipped with a detachable and sealed pressure measuring tool 27 through the central channel. One side of the bridge-type eccentric water distributor 22 is provided with an eccentric hole. The two ends of the eccentric hole are provided with an inlet 24 and an outlet 25. A plug 23 is installed in the eccentric hole. The inside of the plug 23 is provided with a flow channel. The inlet 24, the flow channel and the outlet 25 are connected. The bottom of the bridge-type eccentric water distributor 22 is provided with a water distributor basket 26.

[0025] In practical applications, the top of cable head 1 is connected to a cable, which is a single-core cable with a diameter of less than 4mm. Cable head 1 is connected to the ground monitoring instrument through the cable, and cable head 1 transmits power and signals through the cable.

[0026] In this stratified pressure measuring instrument, the motor assembly includes circuit 3 and motor 4. The top of circuit 3 is connected to the centralizer 2, the bottom of circuit 3 is connected to motor 4, and the bottom of motor 4 is connected to the lead screw 5. Circuit 3 receives and transmits signals from the ground monitoring instrument, and circuit 3 controls motor 4 to drive lead screw 5.

[0027] In practical applications, the pressure sensor assembly includes a formation pressure sensor 7 and a tubing pressure sensor 8. The top of both the formation pressure sensor 7 and the tubing pressure sensor 8 are connected to a sealing mechanism 6, and one side of the formation pressure sensor 7 is connected to the tubing pressure sensor 8.

[0028] In this stratified pressure testing instrument, the bottom ends of the formation pressure sensor 7 and the tubing pressure sensor 8 are both connected to the locking ball mechanism 9 and the removable sealing pressure testing tool 27. The removable sealing pressure testing tool 27 monitors the changes in formation pressure through the formation pressure sensor 7 and monitors the changes in tubing pressure through the tubing pressure sensor 8.

[0029] In practical applications, the bottom end of the retrieval head 10 is connected to the mechanical locking mechanism 11, the bottom end of the mechanical locking mechanism 11 is connected to the sealing cup assembly, the bottom end of the sealing cup assembly is connected to the support arm 15, the bottom end of the support arm 15 is connected to the locking cam mechanism 16, the bottom end of the locking cam mechanism 16 is a connector, the bottom end of the connector is connected to the dual-channel storage pressure gauge 19, and the bottom end of the dual-channel storage pressure gauge 19 is a guide cone 20.

[0030] In this layered pressure measuring instrument, the sealing cup assembly includes an upper sealing cup, a pressure transmission port, and a lower sealing cup. The top of the upper sealing cup is connected to a mechanical locking mechanism, and the bottom of the upper sealing cup is connected to the lower sealing cup. The pressure transmission port is located between the upper and lower sealing cups and connects to the inlet and outlet. The bottom of the lower sealing cup is connected to a support arm.

[0031] In practical applications, the top end of the pressure-conducting tube 17 is connected to the formation pressure sensor 7 and the tubing pressure sensor 8. After the detachable sealing pressure measuring tool 27 is set, the pressure transmission port 13 transmits the formation pressure to the pressure-conducting tube 17, which in turn transmits the formation pressure to the formation pressure sensor 7. The tubing pressure sensor 8 directly acquires the pressure inside the tubing, and the pressure-conducting tube 17 transmits the formation pressure to the dual-channel storage pressure gauge 19. The dual-channel storage pressure gauge 19 measures and stores the formation pressure data and the tubing pressure data.

[0032] In this stratified pressure measuring instrument, the locking cam mechanism 16 is supported on the water distributor basket 26 by the support arm 15. The locking cam mechanism 16 releases the support arm 15 by flipping. The support arm 15 includes a compression spring, which supports extension and retraction. The compression spring releases or retracts the support arm 15 by extension and retraction.

[0033] In practical applications, the bottom end of the connector is provided with a pressure gauge connection thread 18. The connector is connected to the dual-channel storage pressure gauge 19 through the pressure gauge connection thread 18. The dual-channel storage pressure gauge 19 is protected by a guide cone 20.

[0034] This invention also provides a testing method for a layered pressure measuring instrument for stationary plugs in bridge-type eccentric injection wells, comprising: Deployment of removable sealing pressure testing tool 27 and retrieval of removable sealing pressure testing tool 27; During deployment, the working schedule of the dual-channel storage pressure gauge 19 is set. The support arm 15 is retrieved and locked via the locking cam mechanism 16. The retrieval head 10 is locked in conjunction with the locking ball mechanism 9. The pressure testing tool string is inserted into the wellhead blowout preventer. The guide cone 20 is lowered 2m below the bridge-type eccentric water distributor 22 in the target formation. Deployment is stopped, and the pressure testing tool string is slowly raised until the guide cone 20 is fully withdrawn from the target formation. The locking cam mechanism 16 releases the support arm 15. The pressure testing tool string is lowered again, with the support arm 15 supported in the water distributor basket 26. The tubing pressure before setting is tested using the surface monitoring instrument. The control motor 4 drives the lead screw push rod 5 to move. The lead screw push rod 5 drives the locking ball mechanism 9 through the sealing mechanism 6. The locking ball mechanism 9 pushes the upper sealing cup 12 and the lower sealing cup 14 to open and seal the bridge-type eccentric water distributor 22. The formation pressure and oil pipe pressure are tested after setting. The dual-channel storage pressure gauge 19 records the changes in formation pressure and oil pipe pressure in real time until the ground monitoring instrument observes that the formation pressure and oil pipe pressure are separated. The control motor 4 continues to lock the mechanical locking mechanism 11 to complete the release. The oil pipe pressure after release is observed. The cable retrieval instrument 21 is then retrieved. During the retrieval process, after the layered pressure testing is completed according to the time, the cable retrieval instrument 21 is installed into the wellhead blowout preventer. The cable retrieval instrument 21 is lowered to the bridge-type eccentric water distributor 22 of the target layer. The locking ball mechanism 9 captures and locks the retrieval head 10. The pressure guide pipe 17 is connected to the pressure sensor assembly. The surface monitor detects the formation pressure and tubing pressure of the target layer. The surface monitor controls the motor 4 to pull the screw push rod 5 to move. The screw push rod 5 drives the locking ball mechanism 9 through the sealing mechanism 6. The locking ball mechanism 9 pulls the retrieval head 10, the upper sealing cup 12 and the lower sealing cup 14 to retract and release pressure. The formation pressure and tubing pressure are balanced by observing the surface monitor. The detachable sealing pressure testing tool 27 is then unsealed. The cable is lifted, and the cable retrieval instrument 21 and the detachable sealing pressure testing tool 27 are pulled out.

[0035] In this test method, the tubing pressure before setting is the flow pressure when the pressure testing tool string is lowered again. The tubing pressure before setting is the value when the tubing pressure reading observed by the ground monitoring instrument is equal to the formation pressure reading. The test time range for the tubing pressure before setting is 2-5 minutes. The test time for the formation pressure after setting is 2-5 minutes. The formation pressure after setting is the formation pressure reading observed by the ground monitoring instrument. The tubing pressure after setting is the tubing pressure reading observed by the ground monitoring instrument. The formation pressure and tubing pressure after setting are not equal. The tubing pressure after unloading is the value when the tubing pressure reading observed by the ground monitoring instrument is equal to the formation pressure reading.

[0036] This invention provides a layered pressure testing instrument and method for bridge-type eccentric water injection wells with stationary plugs. It effectively reduces the number of testing steps for layered pressure testing of bridge-type eccentric water injection wells, lowers labor intensity, and improves testing efficiency. Simultaneously, it reduces pressure disturbance in the water injection well. The dual-channel storage pressure gauge can acquire the pressure before the nozzle under normal water injection conditions in the target formation, effectively improving the quality of layered pressure testing data and interpreting more accurate formation parameter information. The working principle of this bridge-type eccentric water injection well stationary plugged layered pressure testing instrument and method is described in detail below: In this embodiment, the testing instrument string includes a cable retrieval instrument 21 and a detachable sealing pressure testing tool 27. The cable retrieval instrument 21 is used to retrieve the detachable sealing pressure testing tool 27. The detachable sealing pressure testing tool 27 can be released into the bridge-type eccentric water distributor 22 for stratified pressure testing. The cable retrieval instrument 21 includes a cable head 1, a stabilizer 2, a circuit 3, a motor 4, a lead screw 5, a sealing mechanism 6, a formation pressure sensor 7, an oil pipe pressure sensor 8, and a locking ball 9. The detachable sealing pressure testing tool 27 includes a retrieval head 10, a mechanical locking mechanism 11, an upper sealing cup 12, a pressure transmission port 13, a lower sealing cup 14, a support arm 15, a cam mechanism 16, a pressure guide tube 17, a pressure gauge connection thread 18, a dual-channel storage pressure gauge 19, and a guide cone 20.

[0037] In practical applications, cable head 1 connects to a 3.2mm single-core cable and is connected to the monitoring instrument on the ground for power and signal transmission. Centralizer 2 is used to center the instrument within the tubing during downhole testing, ensuring the detachable sealing pressure testing tool 27 is centered when set in the bridge-type eccentric water distributor 22. Circuit 3 receives power at the cable end, transmits and receives control signals and pressure test signals, and controls motor 4 to drive the lead screw 5. The lead screw 5, through sealing mechanism 6, drives locking ball mechanism 9, controlling the setting, unclamping, and retrieval process of the detachable sealing pressure testing tool 27. After the cable retrieval instrument 21 is combined with the detachable sealing pressure testing tool 27, formation pressure sensor 7 is connected to the pressure guide tube 17 of the detachable sealing pressure testing tool 27. During setting in the bridge-type eccentric water distributor 22, it can obtain formation pressure changes through pressure transmission port 13, while tubing pressure sensor 8 directly obtains pressure changes within the tubing.

[0038] In this embodiment, the upper part of the detachable sealing pressure testing tool 27 is a retrieval head 10. The retrieval head 10 is used to lock with the locking ball mechanism 9 of the cable retrieval instrument 21 and is used for retrieval after being released from the clamp. The mechanical locking mechanism 11 is used for the setting and locking action mechanism of the detachable sealing pressure testing tool 27 after being released from the clamp, preventing the upper sealing cup 12 and the lower sealing cup 14 from being unsealed and failing during testing. The pressure transmission port 13 is located between the upper sealing cup 12 and the lower sealing cup 14. After the detachable sealing pressure testing tool 27 is set in the bridge-type eccentric water distributor 22, the pressure transmission port 13 corresponds to the position of the inlet 24 of the water distributor. Therefore, after setting, the formation pressure will enter the pressure guide pipe 7 along the pressure transmission port 13, and will transmit the formation pressure to the dual-channel storage pressure gauge 19 and the formation pressure sensor 7 in the cable retrieval instrument 21. The support arm 15 is used for positioning and supporting the detachable sealing pressure testing tool 27 in the bridge-type eccentric water distributor 22. The support arm 15 retracts during descent and is locked using the locking cam mechanism 16.

[0039] The locking cam mechanism 16 is used to lock and open the support arm 15. It is a commonly used mechanical structure in eccentric drop and retrievers used for well testing. When the cable drop and retriever 21 and the detachable sealing pressure testing tool 27 are connected to the bridge-type eccentric water distributor 22, the locking cam mechanism 16 will hook onto the water distributor basket 26 during lifting, thus flipping and releasing the support arm 15. The support arm 15 will spring open under the action of the compression spring. The pressure gauge connection thread 18 is a reserved interface in the detachable sealing pressure testing tool 27. The pressure gauge connection thread 18 is located on the connector head. During testing, a conventional 20mm dual-channel storage pressure gauge 19 can be connected. The dual-channel storage pressure gauge 19 is used to store the tubing pressure and formation pressure data of the target section downhole. The guide cone 20 is used to protect the dual-channel storage pressure gauge 19. Its end is made into a conical shape to facilitate the normal raising and lowering of the instrument string.

[0040] It should be noted that when the cable retrieval instrument 21 and the detachable sealing pressure testing tool 27 are used on site, the following process must be followed in order to achieve the testing method of this embodiment.

[0041] In practical applications, the testing method needs to be carried out in a bridge-type eccentric injection well. The testing method mainly consists of deploying the removable seal pressure testing tool 27 and retrieving the removable seal pressure testing tool 27. Deploying the removable seal pressure testing tool 27 should be carried out from bottom to top according to the target layer, and retrieving the removable seal pressure testing tool 27 should be carried out from top to bottom according to the target layer.

[0042] In this embodiment, the removable sealing pressure testing tool 27 is located in the central channel of the bridge-type eccentric water distributor 22, and the support arm 15 is supported in the water distributor basket 26. The upper sealing cup 12 and the lower sealing cup 14 are compressed, so that the pressure transmission port 13 in the removable sealing pressure testing tool 27 is connected to the liquid inlet 25 in the bridge-type eccentric water distributor 22. Since the plug 23 has a flow channel, the formation pressure at the liquid outlet 24 can be transmitted to the pressure transmission port 13. Therefore, the dual-channel storage pressure gauge 19 installed at the lower end of the removable sealing pressure testing tool 27 can obtain the true formation pressure after the removable sealing pressure testing tool 27 is sealed and de-clamped.

[0043] In practical applications, the working schedule of the dual-channel storage pressure gauge 19 is set via computer. After the dual-channel storage pressure gauge 19 is powered on, the guide cone 20 is installed at the pressure gauge connection thread 18 of the connector below the removable sealing pressure testing tool 27. The support arm 15 of the removable sealing pressure testing tool 27 is retracted, and the locking cam mechanism 16 is flipped to lock the support arm 15. The cable casting and retrieval instrument 21 is connected to the removable sealing pressure testing tool 27, so that the upper part of the removable sealing pressure testing tool 27 is the retrieval head 10, and the retrieval head 10 is locked with the locking ball mechanism 9 of the cable casting and retrieval instrument 21. The pressure testing tool string is inserted into the wellhead blowout preventer. The guide cone 20 is lowered 2m below the bridge-type eccentric water distributor 22 of the target layer, and the lowering is stopped. The measuring tool is slowly lifted up. Press the pressure testing tool string to ensure that the guide cone 20 is fully lifted out of the target layer. The locking cam mechanism 16 will engage with the water distributor basket 26, thus rotating and releasing the support arm 15 to open. Lower the pressure testing tool string again, with the support arm 15 supported in the water distributor basket 26. Test the flow pressure for 3 minutes. Since there is no set seal, the ground-displayed formation pressure data and tubing pressure data should be consistent, both being tubing pressure. The ground monitoring instrument controls the motor 4 of the cable retrieval instrument 21 to move, driving the lead screw push rod 5 to move. The lead screw push rod 5 drives the locking ball mechanism 9 through the sealing mechanism 6, pushing the upper sealing cup 12 and lower sealing cup 14 of the detachable sealing pressure testing tool 27 to open, sealing on the two sealing surfaces of the bridge-type eccentric water distributor 22. Test the pressure change for 3 minutes. After the target formation water injection has stopped, the formation pressure data and tubing pressure data displayed on the surface begin to show differences. The dual-channel storage pressure gauge 19 records the changes in formation pressure and tubing pressure downhole. At the same time, the pressure of the formation pressure sensor 7 and the tubing pressure sensor 8 in the cable drop and retrieve instrument 21 can be observed to rapidly separate on the surface. If the formation pressure and tubing pressure displayed on the surface monitor separate, it indicates that the detachable sealing pressure testing tool 27 has completed sealing and the detachable sealing pressure testing tool has been successfully deployed.

[0044] In this embodiment, the ground monitoring instrument controls the motor 4, which pulls the screw push rod 5 to move. The screw push rod 5 drives the locking ball mechanism 9 through the sealing mechanism 6, pulling the retrieval head 10, upper sealing cup 12 and lower sealing cup 14 on the detachable sealing pressure testing tool 27 back to release pressure. The formation pressure and oil pipe pressure displayed by the ground monitoring instrument gradually reach equilibrium, indicating that the detachable sealing pressure testing tool 27 has been unsealed. The cable can be slowly lifted, and the cable retrieval instrument 21 and the detachable sealing pressure testing tool 27 can be pulled out from the bridge-type eccentric water distributor 22. The retrieval of the detachable sealing pressure testing tool 27 is successful.

[0045] In practical applications, to achieve the stratified pressure measurement in this embodiment, it is necessary to use the two sealing surfaces and inlet reserved in the central channel of the bridge-type eccentric water distributor for sealing and pressure measurement. In this embodiment, during the unplugging test, the packer can be unplugged step-by-step from bottom to top within the bridge-type eccentric injection well for stratified pressure measurement. In this embodiment, during the non-unplugging test, the packer can be quickly verified from bottom to top within the bridge-type eccentric injection well. In this embodiment, the original well plugger does not need to be retrieved during stratified pressure measurement; the test can be completed simply by dropping and retrieving the test tool string. Compared to the currently used plugging pressure gauge testing process, this reduces the testing steps by half, lowers labor intensity by half, and doubles testing efficiency. The dual-channel storage pressure gauge can monitor the tubing pressure under normal water injection conditions in the target stratum, improving the quality of stratified pressure measurement data from the injection well and interpreting more accurate formation parameter information. Simultaneously, since the original well plugger does not need to be retrieved, the injection status of the test well remains undisturbed, avoiding backflow in high-pressure strata and packer opening during well washing.

[0046] The present invention provides a bridge-type eccentric water injection well stationary plugging device and a testing method for layered pressure testing. A detachable sealing pressure testing tool is carried into the well via a cable-operated retrieval device. After being supported by the bridge-type eccentric water distributor in the target layer, the cable-operated retrieval device is driven by a motor controlled from the ground to achieve setting and pressure testing. Simultaneously, the cable-operated retrieval device can monitor the setting status of the detachable sealing pressure testing tool through pressure monitoring, deciding whether to conduct the detachment test or terminate the test. A dual-channel storage pressure gauge can monitor the tubing pressure under normal water injection conditions in the target layer, improving the quality of layered pressure testing data in water injection wells and interpreting more accurate formation parameter information.

[0047] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A layered pressure measuring instrument for a bridge-type eccentric injection well with a stationary blockage device, characterized in that, include: The pressure testing tool string includes a cable retrieval instrument (21) and a removable sealing pressure testing tool (27). The bottom end of the cable retrieval instrument (21) can be connected to the removable sealing pressure testing tool (27). The removable sealing pressure testing tool (27) can be seated in a bridge-type eccentric water distributor (22). A blocker (23) is installed on one side inside the bridge-type eccentric water distributor (22). The cable retrieval instrument (21) controls the removable sealing pressure testing tool (27) to test pressure, remove the clip, and retrieve the cable inside the bridge-type eccentric water distributor (22). The cable retrieval instrument (21) includes a cable head (1), which is connected to a ground monitoring instrument. The bottom end of the cable head (1) is connected to a centralizer (2), which is connected to a motor assembly. The bottom end of the motor assembly is connected to a lead screw (5), which is connected to a sealing mechanism (6). The bottom end of the sealing mechanism (6) is connected to a pressure sensor assembly, which is connected to a locking ball mechanism (9) and a detachable sealing pressure testing tool (27). The pressure sensor assembly monitors the pressure change of the detachable sealing pressure testing tool (27). The locking ball mechanism (9) is connected to the detachable sealing pressure testing tool (27). The motor assembly transmits and receives signals from the ground monitoring instrument. The motor assembly drives the lead screw (5) to move. The lead screw (5) drives the locking ball mechanism (9) through the sealing mechanism (6). The removable sealing pressure measuring tool (27) includes a pressure guide tube (17). The top end of the pressure guide tube (17) is connected to a pressure sensor assembly. The outside of the pressure guide tube (17) is connected to a retrieval head (10), a mechanical locking mechanism (11), a sealing cup assembly, a support arm (15), a locking cam mechanism (16), a connector, a dual-channel storage pressure gauge (19), and a guide cone (20). The top end of the retrieval head (10) is connected to a locking ball mechanism (9). The bottom end of the retrieval head (10) is connected in sequence to the mechanical locking mechanism (11), the sealing cup assembly, the support arm (15), the locking cam mechanism (16), the connector, the dual-channel storage pressure gauge (19), and the guide cone (20). The support arm (15) is locked or opened by the locking cam mechanism (16). The dual-channel storage pressure gauge (19) monitors pressure changes.

2. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 1, characterized in that, The bridge-type eccentric water distributor (22) is provided with a central channel. The bridge-type eccentric water distributor (22) is equipped with a removable sealing pressure measuring tool (27) through the central channel. The bridge-type eccentric water distributor (22) has an eccentric hole on one side inside. The two ends of the eccentric hole are provided with an inlet (24) and an outlet (25). A plug (23) is installed inside the eccentric hole. The plug (23) has a flow channel inside. The inlet (24), the flow channel and the outlet (25) are connected. The bottom of the bridge-type eccentric water distributor (22) is provided with a water distributor basket (26).

3. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 1, characterized in that, The top of the cable head (1) is connected to a cable, which is a single-core cable with a diameter of less than 4 mm. The cable head (1) is connected to the ground monitoring instrument through the cable, and the cable head (1) transmits power and signals through the cable.

4. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 1, characterized in that, The motor assembly includes a circuit (3) and a motor (4). The top of the circuit (3) is connected to a centralizer (2), the bottom of the circuit (3) is connected to the motor (4), and the bottom of the motor (4) is connected to a lead screw (5). The circuit (3) receives and transmits signals transmitted by the ground monitoring instrument, and the circuit (3) controls the motor (4) to drive the lead screw (5).

5. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 1, characterized in that, The pressure sensor assembly includes a formation pressure sensor (7) and a tubing pressure sensor (8). The top of both the formation pressure sensor (7) and the tubing pressure sensor (8) are connected to a sealing mechanism (6). One side of the formation pressure sensor (7) is connected to the tubing pressure sensor (8).

6. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 5, characterized in that, The bottom ends of the formation pressure sensor (7) and the tubing pressure sensor (8) are both connected to a locking ball mechanism (9) and a removable sealing pressure measuring tool (27). The removable sealing pressure measuring tool (27) monitors the changes in formation pressure through the formation pressure sensor (7) and monitors the changes in tubing pressure through the tubing pressure sensor (8).

7. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 1, characterized in that, The bottom end of the retrieval head (10) is connected to a mechanical locking mechanism (11), the bottom end of the mechanical locking mechanism (11) is connected to a sealing cup assembly, the bottom end of the sealing cup assembly is connected to a support arm (15), the bottom end of the support arm (15) is connected to a locking cam mechanism (16), the bottom end of the locking cam mechanism (16) is a connector, the bottom end of the connector is connected to a dual-channel storage pressure gauge (19), and the dual-channel storage pressure gauge (19) is a mounting guide cone (20).

8. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 2, characterized in that, The sealing cup assembly includes an upper sealing cup (12), a pressure transmission port (13), and a lower sealing cup (14). The top of the upper sealing cup (12) is connected to a mechanical locking mechanism (11), and the bottom of the upper sealing cup (12) is connected to the lower sealing cup (14). The pressure transmission port (13) is located between the upper sealing cup (12) and the lower sealing cup (14). The pressure transmission port (13) is connected to the liquid inlet (24) and the liquid outlet (25). The bottom of the lower sealing cup (14) is connected to a support arm (15).

9. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 6 or 8, characterized in that, The top end of the pressure guide tube (17) is connected to the formation pressure sensor (7) and the tubing pressure sensor (8). After the detachable sealing pressure measuring tool (27) is set, the pressure transmission port (13) transmits the formation pressure and tubing pressure to the pressure guide tube (17). The pressure guide tube (17) transmits the formation pressure to the formation pressure sensor (7). The tubing pressure sensor (8) directly obtains the tubing pressure. The pressure guide tube (17) transmits the formation pressure and tubing pressure to the dual-channel storage pressure gauge (19). The dual-channel storage pressure gauge (19) measures and stores the formation pressure data and the tubing pressure data.

10. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 2, characterized in that, The locking cam mechanism (16) is supported on the water distributor basket (26) by a support arm (15). The locking cam mechanism (16) releases the support arm (15) by flipping. The support arm (15) includes a compression spring that supports extension and retraction. The compression spring releases or retracts the support arm (15) by extension and retraction.

11. The bridge-type eccentric injection well stationary blockage layered pressure measuring instrument according to claim 1, characterized in that, The bottom end of the connector is provided with a pressure gauge connection thread (18), and the connector is connected to a dual-channel storage pressure gauge (19) through the pressure gauge connection thread (18). The dual-channel storage pressure gauge (19) is protected by a guide cone (20).

12. A testing method for a layered pressure measuring instrument for a bridge-type eccentric injection well stationary blockage device based on any one of claims 1-11, characterized in that, include: Deploy the removable sealing pressure testing tool (27) and retrieve the removable sealing pressure testing tool (27); During deployment, the working schedule of the dual-channel storage pressure gauge (19) is set, the support arm (15) is locked by the locking cam mechanism (16), the retrieval head is locked by the locking ball mechanism (9), the pressure testing tool string is loaded into the wellhead blowout preventer, the guide cone (20) is lowered to 2m below the bridge-type eccentric water distributor (22) of the target layer, the lowering is stopped, the pressure testing tool string is slowly lifted, the guide cone (20) is completely lifted out of the target layer, the locking cam mechanism (16) releases the support arm (15), the pressure testing tool string is lowered again, the support arm (15) is supported in the water distributor basket (26), and the dual-channel storage pressure gauge (19) records the formation in real time. The pressure and tubing pressure change, the tubing pressure before setting is tested, the ground monitoring instrument controls the motor (4) to drive the screw push rod (5) to move, the screw push rod (5) drives the locking ball mechanism (9) through the sealing mechanism (6), the locking ball mechanism (9) pushes the upper sealing cup (12) and the lower sealing cup (14) to open, and seals the bridge eccentric water distributor (22), the tubing pressure and formation pressure after setting are tested, the tubing pressure and formation pressure are observed through the ground monitoring instrument, the motor (4) is controlled again, the mechanical locking mechanism (11) locks, the unjamming is completed, the tubing pressure after unjamming is observed, and the cable retrieval instrument (21) is pulled out. During the retrieval, after the layered pressure measurement is completed according to the time, the cable retrieval instrument (21) is installed into the blowout preventer at the wellhead. The cable retrieval instrument (21) is lowered to the bridge-type eccentric water distributor (22) of the target layer. The locking ball mechanism (9) captures and locks the retrieval head (10). The pressure guide pipe (17) is connected to the pressure sensor assembly. The ground monitor monitors the formation pressure and tubing pressure of the target layer. The ground monitor controls the motor (4) to pull the screw push rod (5) to move. The screw push rod (5) drives the locking ball mechanism (9) through the sealing mechanism (6). The locking ball mechanism (9) pulls the retrieval head (10), the upper sealing cup (12) and the lower sealing cup (14) to retract and depressurize. The formation pressure and tubing pressure balance are observed through the ground monitor. The detachable sealing pressure measuring tool (27) is unsealed. The cable is lifted and the cable retrieval instrument and the detachable sealing pressure measuring tool are pulled out.

13. The test method according to claim 12, characterized in that, The unset tubing pressure is the flow pressure when the pressure testing tool string is lowered again. The unset tubing pressure is the value when the tubing pressure reading observed by the ground monitoring instrument is equal to the formation pressure reading. The test time range for the unset tubing pressure is 2-5 minutes. The test time for the set formation pressure is 2-5 minutes. The set formation pressure is the formation pressure reading observed by the ground monitoring instrument. The set tubing pressure is the tubing pressure reading observed by the ground monitoring instrument. The set formation pressure and tubing pressure are not equal. The unloaded tubing pressure is the value when the tubing pressure reading observed by the ground monitoring instrument is equal to the formation pressure reading.

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