Underground wireless communication layered water injection system and underground water injection adjusting method

Abstract

The underground wireless communication layered water injection system comprises a water injection device and a communication device, and the water injection device and the communication device are connected through a wireless communication technology; the water injection device comprises a central pipe, an outer protective pipe is sleeved outside the central pipe, two end parts of the outer protective pipe and the central pipe are respectively connected with a lower joint and an upper joint through threads, and the communication device comprises a cable short section and a wireless communication short section. The invention further discloses an underground water injection adjusting method. Related parameters are set before descending into a well; lowering the water injection device to an underground water injection layer; starting a water nozzle module, and periodically measuring and adjusting water injection; if the underground water injection flow needs to be adjusted, the communication device is lowered; after communication connection, the target injection allocation amount and the timing adjustment period are adjusted; and after the adjustment is completed, the communication device is taken out from the underground. The invention discloses an underground wireless communication separated layer water injection system and an underground water injection adjusting method, and solves the problem that underground water injection flow adjustment cannot be quickly completed in the prior art.

Description

Technical Field

[0001] The present invention belongs to the technical field of layered water injection equipment, and relates to an underground wireless communication layered water injection system. The present invention also relates to an underground water injection adjustment method. Background Art

[0002] With the continuous development of oil and gas fields, the pressure and oil content of oil layers are continuously decreasing, the production of oil wells is continuously decreasing, and even many wells are shut down, resulting in a large amount of crude oil in some formations that cannot be exploited. In order to make up for the formation void caused by crude oil exploitation and achieve high and stable production of oil fields, it is necessary to inject water into the oil layer to ensure the oil layer pressure. Due to the influence of factors such as oil layer pressure or porosity, the production of oil layers is inconsistent, and the water injection of each oil layer is also inconsistent. Therefore, it is necessary to carry out layered water injection according to different formations, that is, to achieve refined control of water injection into the formation, so as to improve the oil recovery rate.

[0003] At present, the commonly used layered water injection methods in the oil and gas field are side measurement and adjustment technology, concentric double-tube technology, and cable intelligent separate injection technology. In the side measurement and adjustment technology, the downhole water injection tool cannot be automatically adjusted. When adjusting, it is necessary to rely on lowering the test instrument. After the adjustment is completed, the test instrument is taken out. The downhole water injection tool continues to inject water according to the current adjusted state. However, the water injection situation will change with the extension of the water injection time, and it is necessary to often lower the test instrument for adjustment, with high adjustment cost and slow adjustment time; the concentric double-tube technology has stable water injection, but it cannot lower the logging instrument and the adjustment takes a long time; the cable intelligent separate injection technology requires pre-setting cables, with complex construction technology, high cost, and slow adjustment.

[0004] In summary, it is lacking in the prior art to quickly complete the downhole water injection flow rate adjustment. Summary of the Invention

[0005] The purpose of the present invention is to provide an underground wireless communication layered water injection system, which solves the problem that the downhole water injection flow rate adjustment cannot be quickly completed in the prior art.

[0006] Another purpose of the present invention is to provide an underground water injection adjustment method.

[0007] The technical solution adopted by the present invention is that the underground wireless communication layered water injection system includes a water injection device and a communication device, and the water injection device and the communication device are connected by means of wireless communication technology; the water injection device includes a central pipe, an outer protection pipe is sleeved outside the central pipe, and a lower joint and an upper joint are respectively connected to both ends of the outer protection pipe and the central pipe by threads. A wireless communication module is threadedly connected to the lower joint, and a seal inspection module and a nozzle module are connected to the lower joint by threads; the communication device includes a cable short joint and a wireless communication short joint.

[0008] The characteristics of the present invention also lie in:

[0009] Both ends of the central pipe are sealed with rubber rings at the connections with the lower joint and the upper joint. The seal verification module, the nozzle module, and the wireless communication module are arranged in parallel between the annulus of the central pipe and the outer protection pipe. The upper joint is threadedly connected with a nozzle power supply module and a circuit power supply module, and the nozzle power supply module and the circuit power supply module are arranged in parallel between the annulus of the central pipe and the outer protection pipe. A flowmeter is connected between the lower joint and the upper joint, and both ends of the flowmeter are sealed with rubber rings. The flowmeter is outside the central pipe and inside the outer protection pipe. The seal verification module includes a seal verification module pressure sensor, and one end of the seal verification module pressure sensor away from the lower joint is connected with a seal verification module controller.

[0010] The internal circuit connection relationship of the water injection device is that the circuit power supply module is electrically connected to the seal verification module, the flowmeter, and the wireless communication module respectively. The flowmeter is electrically connected to the seal verification module, the wireless communication module is electrically connected to the seal verification module, the seal verification module is electrically connected to the nozzle module, and the nozzle module is electrically connected to a nozzle power supply module.

[0011] Between the cable nipple and the wireless communication nipple, a weight nipple 1, a positioning nipple, a weight nipple 2, and a control circuit nipple are connected in sequence, and the connection method is threaded connection. The weight nipple 1 and the weight nipple 2 are solid bodies. The positioning nipple includes a mechanical positioning arm, and the mechanical positioning arm is threadedly connected to the weight nipple 2.

[0012] The internal circuit connection relationship of the communication device is that the control circuit nipple is electrically connected to the cable nipple, the wireless communication nipple, and the positioning nipple, and the positioning nipple is electrically connected to the mechanical positioning arm.

[0013] Another technical solution adopted by the invention is a downhole water injection adjustment method, which is specifically implemented according to the following steps: Step 1: Set relevant parameters in the water injection device before lowering it into the well. Step 2: Lower the water injection device to the downhole water injection layer through the tubing string and start setting the packer. Step 3: After the setting of the packer is completed, the nozzle module is automatically opened, and then flow rate measurement and adjustment are carried out according to the target injection volume and the timing adjustment time. After the measurement and adjustment are completed, enter the next cycle. Under the condition that the target injection volume remains unchanged, the water injection is periodically measured and adjusted. Step 4: If the downhole water injection flow rate needs to be adjusted, lower the communication device to communicate with the water injection device. Step 5: After the communication connection, adjust the target injection volume and the timing adjustment cycle. Step 6: After the adjustment is completed, take out the communication device from the well, and the water injection device continues to work underground according to the adjusted parameters.

[0014] Another feature of another technical solution of the present invention is that:

[0015] In Step 1, relevant parameters are set in the seal verification module of the water injection device through the communication device in the upper computer software monitoring interface. The relevant parameters in Step 1 include formation, target injection volume, clock time, regular adjustment period, and the time to open the nozzle regularly after setting the packer. In Step 2, the upper and lower ends of the water injection device are connected to the tubing nipple. In Step 3, the seal verification module measures and adjusts the flow rate by controlling the nozzle module. The water injection device regularly collects the flow rate and pressure values through the flowmeter and the pressure sensor of the seal verification module and stores them in the seal verification module controller.

[0016] In Step 4, when it is necessary to quickly complete the downhole flow rate adjustment, lower the communication device to communicate with the water injection device: The end of the cable nipple on the communication device is connected to the wire cable. Through the wellhead equipment, lower the communication device from the inside of the tubing to near the water injection device, send an instruction through the upper computer software monitoring interface, send the instruction through the cable to the wireless communication short section in the communication device, and control the mechanical positioning arm through the wireless communication short section for precise positioning.

[0017] In Step 5, the communication device completes data interaction with the wireless communication module on the water injection device through wireless communication. Adjust the target injection volume and regular adjustment period through the upper computer software monitoring interface, and obtain the flow rate and pressure values collected by the water injection device.

[0018] After the adjustment in Step 6 is completed, retract the mechanical positioning arm, lift the wire cable, take out the communication device from the well, and the water injection device starts the measurement and adjustment work according to the latest target injection volume and regular adjustment period, and conducts periodic measurement and adjustment of water injection.

[0019] The beneficial effects of the present invention are: It solves the problem that the downhole water injection flow rate adjustment cannot be quickly completed in the prior art. The device is simple and reliable in operation. Adopting the wireless communication method, it completes the data instruction interaction with each layer of downhole water injection devices by lowering the communication device, can quickly complete the downhole flow rate adjustment and obtain the historical data information of downhole water injection, and improves the recovery rate of the oil reservoir. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the water injection device in the downhole wireless communication stratified water injection system of the present invention;

[0021] Figure 2 It is a schematic diagram of one side of the internal structure of the water injection device in the downhole wireless communication stratified water injection system of the present invention;

[0022] Figure 3 It is a schematic diagram of the other side of the internal structure of the water injection device in the downhole wireless communication stratified water injection system of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the seal verification module in the downhole wireless communication stratified water injection system of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the nozzle module in the downhole wireless communication stratified water injection system of the present invention;

[0025] Figure 6 It is a schematic diagram of the communication device in the downhole wireless communication stratified water injection system of the present invention;

[0026] Figure 7 It is a schematic diagram of the positioning sub in the downhole wireless communication stratified water injection system of the present invention;

[0027] Figure 8 It is a schematic diagram of the control circuit sub in the downhole wireless communication stratified water injection system of the present invention;

[0028] Figure 9 It is a schematic diagram of the wireless communication sub in the downhole wireless communication stratified water injection system of the present invention;

[0029] Figure 10 It is a schematic diagram of the circuit connection of the water injection device in the downhole wireless communication stratified water injection system of the present invention;

[0030] Figure 11 It is a schematic diagram of the circuit connection of the communication device in the downhole wireless communication stratified water injection system of the present invention.

[0031] In the figure, 1. lower joint; 2. outer protection tube; 3. upper joint; 4. central tube; 5. seal inspection module; 6. nozzle module; 7. flowmeter; 8. nozzle power supply module; 9. circuit power supply module; 10. wireless communication module; 11. cable sub; 12. first weight sub; 13. positioning sub; 14. second weight sub; 15. control circuit sub; 16. wireless communication sub; 17. mechanical positioning arm; 18. water injection device; 19. communication device; 20. seal inspection module pressure sensor; 21. seal inspection module controller; 22. fluid inlet of the nozzle module; 23. fluid outlet of the nozzle module. Specific embodiments

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] The present invention provides a downhole wireless communication stratified water injection system, which consists of two parts: a water injection device 18 and a communication device 19.

[0034] As Figure 1 shown, the main structure of the water injection device 18 is: the two ends of the water injection device 18 are respectively a lower joint 1 and an upper joint 3, the outer side of the middle part of the water injection device 18 is an outer protection tube 2, the outer protection tube 2 is closely connected to the upper joint 3 and the lower joint 1 to form a sealed cavity, and the remaining modules of the water injection device 18 are located inside the sealed cavity.

[0035] As Figure 2As shown, the seal verification module 5 is hermetically connected to the lower sub 1 in a threaded form. The seal verification module 5 includes a seal verification module pressure sensor 20 and a seal verification module controller 21. Its main functions are to measure the pressures inside and outside the tubing, process and store the data of each short joint component, and adjust the nozzle module 6.

[0036] The nozzle module 6 is hermetically connected to the lower sub 1 in a threaded form. Inside the nozzle module 6, there are a motor drive part and a control part, mainly for finely adjusting the flow rate of the liquid flowing from inside the tubing to the outside of the tubing.

[0037] One end of the flowmeter 7 is connected to the lower sub 1, and the other end is connected to the upper sub 3. Inside, there are sensors and related flow accessories, etc. Its main function is to measure the flow rate of the liquid flowing from inside the tubing to the outside of the tubing.

[0038] The nozzle power supply module 8 is connected to the upper sub 3. Inside, it is mainly a battery, mainly for providing power to the nozzle module 6 to ensure its normal operation.

[0039] The circuit power supply module 9 is connected to the upper sub 3. Inside, it is mainly a battery, and its main function is to provide power to the circuit board to ensure the normal operation of the circuit board.

[0040] As Figure 3 shown, the wireless communication module 10 is connected to the lower sub 1. Inside, it includes a wireless transmitter, a wireless receiver and related accessories. Its main function is to communicate with the wireless communication short joint 16.

[0041] One end of the central tube 4 is connected to the lower sub 1, and the other end is connected to the upper sub 3. Inside the central tube 4 is a water injection channel.

[0042] As Figure 4 shown, the seal verification module 5 includes a seal verification module pressure sensor 20 and a seal verification module controller 21. The seal verification module pressure sensor 20 is mainly for measuring the water injection pressure and formation pressure. The seal verification module controller 21 is mainly for flow rate adjustment, data acquisition and storage, module control, etc.

[0043] As Figure 5 shown, the nozzle module 6 includes a nozzle module fluid inlet 22 and a nozzle module fluid outlet 23. The nozzle module 6 adjusts the size of the motor control switch to regulate the flow rate of the liquid injected into the formation.

[0044] As Figure 6 shown, the communication device 19 is composed of connected short joints. The cable short joint 11, the first heavyweight short joint 12, the positioning short joint 13, the second heavyweight short joint 14 and the control circuit short joint 15, the wireless communication short joint 16 are sequentially connected in a threaded form.

[0045] The cable nipple 11 is located between the communication device 19 and the cable, mainly for physical and electrical connection, and is equipped with a fishing joint.

[0046] The first heavyweight nipple 12 and the second heavyweight nipple 14 are solid metals, mainly to increase the weight of the nipple and ensure the normal lowering of the instrument.

[0047] The control circuit nipple 15 mainly contains a controller board inside, which mainly controls each component inside the communication device 19 and communicates with the ground equipment.

[0048] The wireless communication nipple 16 contains a wireless communication function module inside, mainly for non-contact data and information interaction with the water injection device 18.

[0049] As Figure 7 shown, the positioning nipple 13 is mainly composed of a motor and a mechanical positioning arm 17. Its main function is to open the mechanical positioning arm 17 when the wireless communication nipple 16 is lowered near the downhole instrument, so as to ensure that the communication device 19 can be accurately positioned at the preset location.

[0050] As Figure 8 shown, the control circuit nipple 15 is the controller inside the communication device 19, which controls each module, collects and stores the historical data information of downhole water injection stored in the water injection device 18, and uploads the information to the ground through the cable.

[0051] As Figure 9 shown, the wireless communication nipple 16 is a standard wireless communication encapsulation module inside the communication device 19, located in the inner cavity between the outer protection tube 2 and the central tube 4. It is mainly for wireless information interaction with the wireless communication module 10 on the water injection device 18.

[0052] As Figure 10 shown, the circuit connection relationship inside the water injection device 18 is as follows: The circuit power supply module 9 is electrically connected to the seal checking module 5, the flowmeter 7, and the wireless communication module 10. The seal checking module 5 is electrically connected to the flowmeter 7, the wireless communication module 10, and the nozzle module 6. The nozzle module 6 is electrically connected to the nozzle power supply module 8.

[0053] As Figure 11 shown, the circuit connection relationship of each nipple inside the communication device 19 is as follows: The control circuit nipple 15 is electrically connected to the cable nipple 11, the wireless communication nipple 16, and the positioning nipple 13. The positioning nipple 13 is electrically connected to the mechanical positioning arm 17.

[0054] The water injection adjustment method of the downhole wireless communication layered water injection system is as follows:

[0055] Step 1: Before the water injection device 18 is lowered into the well, relevant parameters are set in the seal verification module 5 of the water injection device 18 through the communication device 19 in the monitoring interface of the host computer software: formation, target injection volume, clock time, timing adjustment period, time for automatically opening the nozzle after setting packer.

[0056] Step 2: After the settings are completed, the upper and lower ends of the water injection device 18 are connected to the tubing nipple, and it is lowered to the downhole water injection formation through the tubing string to start normal setting packer.

[0057] Step 3: After the setting packer is completed, the water injection device 18 automatically opens the nozzle at the set time, and then performs flow measurement and adjustment according to the target injection volume and timing adjustment period. After the measurement and adjustment are completed, it enters the next cycle; when the target injection volume remains unchanged, the water injection is measured and adjusted periodically; during the working process, the seal verification module 5 adjusts the water injection volume by controlling the nozzle module 6, and the water injection device 18 periodically collects the flow rate and pressure values through the flowmeter 7 and the pressure sensor 20 of the seal verification module and stores them in the seal verification module controller 21.

[0058] Step 4: When it is necessary to quickly complete the downhole water injection flow adjustment, lower the communication device 19 to communicate with the water injection device 18: The end of the cable nipple 11 on the communication device 19 is connected to the wire cable, and through the wellhead equipment, the communication device 19 is lowered from the inside of the tubing to near the water injection device 18, and an instruction is sent through the monitoring interface of the host computer software. The instruction is sent to the wireless communication nipple 16 in the communication device 19 through the cable, and the mechanical positioning arm 17 is controlled through the wireless communication nipple 16 for precise positioning.

[0059] Step 5: The communication device 19 completes data interaction with the wireless communication module 10 on the water injection device 18 through the wireless communication technology of the wireless communication nipple 16, adjusts the target injection volume and timing adjustment period through the monitoring interface of the host computer software, and obtains the flow rate and pressure values collected by the water injection device 18.

[0060] Step 6: After the adjustment is completed, retract the mechanical positioning arm 17, and lift the communication device 19 out of the well by pulling the wire cable. The water injection device 18 starts the measurement and adjustment work according to the latest target injection volume and timing adjustment period, and performs periodic measurement and adjustment of water injection.

[0061] By the combined use of the water injection device 18 and the communication device 19, when the water injection volume needs to be adjusted, the communication device 19 is lowered. The wireless communication sub-section 16 controls the mechanical positioning arm 17 to accurately position near the water injection device 18. Through the monitoring interface of the host computer software, the wireless communication sub-section 16 and the wireless communication module 10 complete data interaction through wireless communication technology, adjust the target injection volume and the timing adjustment period, and obtain the flow rate and pressure values collected by the water injection device 18. The water injection device 18 injects water according to the adjusted target injection volume and the timing adjustment period. In this way, the water injection adjustment time is greatly reduced, and the problem of being unable to quickly complete the downhole water injection flow rate adjustment is solved.

[0062] Embodiment 1

[0063] As Figures 1 - 11 shown, this embodiment provides a downhole wireless communication layered water injection system, including a water injection device 18 and a communication device 19, which are connected by wireless communication technology; the water injection device 18 includes a central pipe 4, an outer protection pipe 2 is sleeved outside the central pipe 4, and a lower joint 1 and an upper joint 3 are respectively connected to both ends of the outer protection pipe 2 and the central pipe 4 by threads. A wireless communication module 10 is threadedly connected to the lower joint 1, and a seal inspection module 5 and a nozzle module 6 are connected to the lower joint 1 by threads; the communication device 19 includes a cable sub-section 11 and a wireless communication sub-section 16. Rubber rings are used for sealing at the connections between both ends of the central pipe 4 and the lower joint 1 and the upper joint 3. The seal inspection module 5, the nozzle module 6, and the wireless communication module 10 are arranged in parallel in the annulus between the central pipe 4 and the outer protection pipe 2; a nozzle power supply module 8 and a circuit power supply module 9 are threadedly connected to the upper joint 3, and the nozzle power supply module 8 and the circuit power supply module 9 are arranged in parallel in the annulus between the central pipe 4 and the outer protection pipe 2; a flowmeter 7 is connected between the lower joint 1 and the upper joint 3, and rubber rings are used for sealing at both ends of the flowmeter 7. The flowmeter 7 is outside the central pipe 4 and inside the outer protection pipe 2; the seal inspection module 5 includes a seal inspection module pressure sensor 20, and one end of the seal inspection module pressure sensor 20 away from the lower joint 1 is connected to a seal inspection module controller 21. The internal circuit connection relationship of the water injection device 18 is that the circuit power supply module 9 is electrically connected to the seal inspection module 5, the flowmeter 7, and the wireless communication module 10 respectively, the flowmeter 7 is electrically connected to the seal inspection module 5, the wireless communication module 10 is electrically connected to the seal inspection module 5, the seal inspection module 5 is electrically connected to the nozzle module 6, and the nozzle module 6 is electrically connected to the nozzle power supply module 8.

[0064] Embodiment 2

[0065] As Figures 1 - 11As shown in the figure, this embodiment provides a downhole wireless communication layered water injection system, which includes a water injection device 18 and a communication device 19. The water injection device 18 and the communication device 19 are connected by means of wireless communication technology; the water injection device 18 includes a central pipe 4, an outer protection pipe 2 is sleeved outside the central pipe 4, and a lower joint 1 and an upper joint 3 are respectively connected to both ends of the outer protection pipe 2 and the central pipe 4 by threads. A wireless communication module 10 is threadedly connected to the lower joint 1, and a seal checking module 5 and a nozzle module 6 are connected to the lower joint 1 by threads; the communication device 19 includes a cable nipple 11 and a wireless communication nipple 16. Rubber rings are used for sealing at the connections between both ends of the central pipe 4 and the lower joint 1 and the upper joint 3. The seal checking module 5, the nozzle module 6, and the wireless communication module 10 are arranged in parallel in the annulus between the central pipe 4 and the outer protection pipe 2; a nozzle power supply module 8 and a circuit power supply module 9 are threadedly connected to the upper joint 3, and the nozzle power supply module 8 and the circuit power supply module 9 are arranged in parallel in the annulus between the central pipe 4 and the outer protection pipe 2; a flowmeter 7 is connected between the lower joint 1 and the upper joint 3. Rubber rings are used for sealing at both connection ends of the flowmeter 7. The flowmeter 7 is outside the central pipe 4 and inside the outer protection pipe 2; the seal checking module 5 includes a seal checking module pressure sensor 20, and a seal checking module controller 21 is connected to one end of the seal checking module pressure sensor 20 away from the lower joint 1.

[0066] The internal circuit connection relationship of the water injection device 18 is that the circuit power supply module 9 is electrically connected to the seal checking module 5, the flowmeter 7, and the wireless communication module 10 respectively. The flowmeter 7 is electrically connected to the seal checking module 5, the wireless communication module 10 is electrically connected to the seal checking module 5, the seal checking module 5 is electrically connected to the nozzle module 6, and the nozzle module 6 is electrically connected to the nozzle power supply module 8. Between the cable nipple 11 and the wireless communication nipple 16, a first weight nipple 12, a positioning nipple 13, a second weight nipple 14, and a control circuit nipple 15 are connected in sequence, and the connection method is threaded connection; the first weight nipple 12 and the second weight nipple 14 are entities. The positioning nipple 13 includes a mechanical positioning arm 17, and the mechanical positioning arm 17 is threadedly connected to the second weight nipple 14. The internal circuit connection relationship of the communication device 19 is that the control circuit nipple 15 is electrically connected to the cable nipple 11, the wireless communication nipple 16, and the positioning nipple 13, and the positioning nipple 13 is electrically connected to the mechanical positioning arm 17.

[0067] Embodiment 3

[0068] This embodiment provides a downhole water injection adjustment method, which is specifically implemented according to the following steps: Step 1: Set relevant parameters in the water injection device 18 before lowering it into the well; Step 2: Lower the water injection device 18 to the downhole water injection layer through the tubing string and start setting the packer; Step 3: After the packer setting is completed, automatically open the nozzle module 6, and then perform flow measurement and adjustment according to the target injection volume and the timing adjustment time. After the measurement and adjustment are completed, enter the next cycle. Under the condition that the target injection volume remains unchanged, periodically measure and adjust the water injection; Step 4: If the downhole water injection flow needs to be adjusted, lower the communication device 19 to communicate with the water injection device 18; Step 5: After the communication connection, adjust the target injection volume and the timing adjustment cycle; Step 6: After the adjustment is completed, take out the communication device 19 from the well, and the water injection device 18 continues to work in the well according to the adjusted parameters.

[0069] In Step 1, set relevant parameters in the seal verification module 5 of the water injection device 18 through the communication device 19 in the upper computer software monitoring interface. The relevant parameters in Step 1 include the layer position, the target injection volume, the clock time, the periodic adjustment cycle, and the time to automatically open the nozzle after setting the packer; In Step 2, the upper and lower ends of the water injection device 18 are connected to the tubing nipple; In Step 3, the seal verification module 5 performs flow measurement and adjustment by controlling the nozzle module 6. The water injection device 18 periodically collects the flow rate and pressure values through the flowmeter 7 and the pressure sensor 20 of the seal verification module and stores them in the seal verification module controller 21.

[0070] Embodiment 4

[0071] This embodiment provides a downhole water injection adjustment method, which is specifically implemented according to the following steps: Step 1: Set relevant parameters in the water injection device 18 before lowering it into the well; Step 2: Lower the water injection device 18 to the downhole water injection layer through the tubing string and start setting the packer; Step 3: After the packer setting is completed, automatically open the nozzle module 6, and then perform flow measurement and adjustment according to the target injection volume and the timing adjustment time. After the measurement and adjustment are completed, enter the next cycle. Under the condition that the target injection volume remains unchanged, periodically measure and adjust the water injection; Step 4: If the downhole water injection flow needs to be adjusted, lower the communication device 19 to communicate with the water injection device 18; Step 5: After the communication connection, adjust the target injection volume and the timing adjustment cycle; Step 6: After the adjustment is completed, take out the communication device 19 from the well, and the water injection device 18 continues to work in the well according to the adjusted parameters.

[0072] In Step 1, relevant parameters are set in the seal verification module 5 of the water injection device 18 through the communication device 19 in the monitoring interface of the host computer software. The relevant parameters in Step 1 include formation, target injection volume, clock time, regular adjustment period, and time to open the nozzle after setting the packer. In Step 2, the upper and lower ends of the water injection device 18 are connected to the tubing nipple. In Step 3, the seal verification module 5 measures and adjusts the flow rate by controlling the nozzle module 6. The water injection device 18 periodically collects the flow rate and pressure values through the flowmeter 7 and the pressure sensor 20 of the seal verification module and stores them in the seal verification module controller 21. In Step 4, when it is necessary to quickly complete the downhole flow rate adjustment, lower the communication device 19 to communicate with the water injection device 18: The end of the cable nipple 11 on the communication device 19 is connected to the wire cable. Through the wellhead equipment, lower the communication device 19 from the inside of the tubing to the vicinity of the water injection device 18. Send an instruction through the monitoring interface of the host computer software, send the instruction through the cable to the wireless communication stub 16 in the communication device 19, and control the mechanical positioning arm 17 through the wireless communication stub 16 for precise positioning. In Step 5, the communication device 19 completes data interaction with the wireless communication module 10 on the water injection device 18 through wireless communication. Adjust the target injection volume and regular adjustment period through the monitoring interface of the host computer software, and obtain the flow rate and pressure values collected by the water injection device 18. In Step 6, after the adjustment is completed, retract the mechanical positioning arm 17, and lift the wire cable to remove the communication device 19 from the well. The water injection device 18 starts the measurement and adjustment work according to the latest target injection volume and regular adjustment period, and performs periodic measurement and adjustment of water injection.

Claims

1. The underground wireless communication layered water injection system is characterized by: The invention comprises a water injection device (18) and a communication device (19), wherein the water injection device (18) and the communication device (19) are connected by means of wireless communication technology; the water injection device (18) comprises a central tube (4), an outer protective tube (2) is connected to the outer shell of the central tube (4), the outer protective tube (2) and the central tube (4) are respectively connected by threads to a lower joint (1) and an upper joint (3) at both ends, the lower joint (1) is threadedly connected to a wireless communication module (10), and the lower joint (1) is threadedly connected to a sealing inspection module (5) and a faucet module (6); the communication device (19) comprises a cable short section (11) and a wireless communication short section (16).

2. The underground wireless communication stratified water injection system according to claim 1, characterized in that: The connection points between the two ends of the central tube (4) and the lower joint (1) and the upper joint (3) are sealed with rubber rings. The sealing inspection module (5), the water nozzle module (6) and the wireless communication module (10) are arranged in parallel between the annulus of the central tube (4) and the outer protective tube (2). The upper joint (3) is threadedly connected with a water nozzle power supply module (8) and a circuit power supply module (9). The water nozzle power supply module (8) and the circuit power supply module (9) are arranged in parallel between the annulus of the central tube (4) and the outer protective tube (2). A flow meter (7) is connected between the lower joint (1) and the upper joint (3). The connection points at both ends of the flow meter (7) are sealed with rubber rings. The flow meter (7) is outside the central tube (4) and inside the outer protective tube (2). The sealing inspection module (5) comprises a sealing inspection module pressure sensor (20). The sealing inspection module pressure sensor (20) is connected to a sealing inspection module controller (21) at one end away from the lower joint (1).

3. The underground wireless communication stratified water injection system according to claim 2 is characterized in that: The circuit connection relationship inside the water injection device (18) is that the circuit power supply module (9) is electrically connected to the sealing inspection module (5), the flow meter (7), and the wireless communication module (10), respectively; the flow meter (7) is electrically connected to the sealing inspection module (5); the wireless communication module (10) is electrically connected to the sealing inspection module (5); the sealing inspection module (5) is electrically connected to the faucet module (6); and the faucet module (6) is electrically connected to the faucet power supply module (8).

4. The underground wireless communication stratified water injection system according to claim 1, characterized in that: A weighted short section 1 (12), a positioning short section (13), a weighted short section 2 (14) and a control circuit short section (15) are sequentially connected between the cable short section (11) and the wireless communication short section (16), and the connection method is threaded connection; the weighted short section 1 (12) and the weighted short section 2 (14) are entities, and the positioning short section (13) includes a mechanical positioning arm (17), and the mechanical positioning arm (17) is connected to the weighted short section 2 (14) by threading.

5. The underground wireless communication stratified water injection system according to claim 4 is characterized in that: The internal circuit connection relationship of the communication device (19) is that the control circuit short section (15) is electrically connected to the cable short section (11), the wireless communication short section (16) and the positioning short section (13), and the positioning short section (13) is electrically connected to the mechanical positioning arm (17).

6. A method for regulating downhole water injection, characterized in that: According to claim 5, the underground wireless communication stratified water injection system is implemented in the following steps: Step 1: before going down the well, set the relevant parameters in the water injection device (18); Step 2: lower the water injection device (18) to the water injection layer in the well through the oil pipe string and start setting the seal; Step 3: after the setting is completed, automatically open the water nozzle module (6), and then measure and adjust the flow according to the target injection volume and the timing adjustment time. After the measurement and adjustment is completed, enter the next cycle. When the target injection volume remains unchanged, periodically measure and adjust the water injection; Step 4: if the well water injection flow rate needs to be adjusted, lower the communication device (19) to communicate with the water injection device 18; Step 5: after the communication is connected, adjust the target injection volume and the timing adjustment cycle; Step 6: after the adjustment is completed, take out the communication device (19) from the well, and the water injection device (18) continues to work in the well according to the adjusted parameters.

7. The underground wireless communication stratified water injection system according to claim 6, characterized in that: In the step 1, relevant parameters are set in the sealing inspection module (5) in the water injection device (18) through the communication device (19) in the upper computer software monitoring interface. The relevant parameters in the step 1 include the layer position, the target injection amount, the clock time, the regular adjustment cycle, and the timing of opening the water nozzle after sealing. In the step 2, the upper and lower ends of the water injection device (18) are connected to the oil pipe short section. In the step 3, the sealing inspection module (5) performs flow measurement and adjustment by controlling the water nozzle module (6), and the water injection device (18) collects the flow and pressure values ​​regularly through the flow meter (7) and the sealing inspection module pressure sensor (20) and stores them in the sealing inspection module controller (21).

8. The underground wireless communication stratified water injection system according to claim 7, characterized in that: In step 4, if it is necessary to quickly complete the downhole flow regulation, the communication device (19) is lowered to communicate with the water injection device (18): the end of the cable short section (11) on the communication device (19) is connected to the wire cable, and the communication device (19) is lowered from the inside of the oil pipe to the vicinity of the water injection device (18) through the wellhead equipment, and a command is issued through the upper computer software monitoring interface, and the command is sent to the wireless communication short section (16) in the communication device (19) through the cable, and the mechanical positioning arm (17) is controlled by the wireless communication short section (16) to perform precise positioning.

9. The underground wireless communication stratified water injection system according to claim 8, characterized in that: In the step five, the communication device (19) exchanges data with the wireless communication module (10) on the water injection device (18) through wireless communication via the wireless communication short section (16), adjusts the target injection volume and the timing adjustment cycle through the upper computer software monitoring interface, and obtains the flow and pressure values ​​collected by the water injection device (18).

10. The underground wireless communication stratified water injection system according to claim 9, characterized in that: After the adjustment in step six is ​​completed, the mechanical positioning arm (17) is retracted, and the communication device (19) is taken out from the well by pulling the steel cable. The water injection device (18) starts the measurement and adjustment work according to the latest target injection volume and the timing adjustment cycle, and performs periodic measurement and adjustment of water injection.

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