Flow remeasurement process suitable for wave code communication separate injection and operation method

Abstract

The invention relates to the technical field of oil field water injection matching tools, in particular to a flow remeasurement process suitable for wave code communication separate injection and an operation method, comprising a ground electromagnetic valve flowmeter, a standard metering tank, a water injection wellhead, an oil pipe, a high-precision electromagnetic flowmeter, a wave code water distributor, a packer, a ball seat, a preset working cylinder, a screen pipe and ground early warning equipment, the preset working barrel is arranged on the underground inner wall, and the wave code water distributor is connected with ground early warning equipment. According to the flow remeasurement process suitable for wave code communication separate injection and the operation method, through calibration of the electromagnetic flowmeter and the standard metering tank, the accuracy of remeasurement data is guaranteed, multiple well depth positions are calibrated for measurement, layered flow coding of a wave code water distributor is adapted, the operation of the whole flow remeasurement process is more convenient and rapid, and the flow remeasurement efficiency is improved. And the accuracy of the whole flow meter can be conveniently monitored by the ground early warning equipment, so that the automation degree of the retesting process is improved, and the working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of oilfield water injection equipment, and in particular to a flow re-measurement process and operation method suitable for wavecode communication-based water injection. Background Technology

[0002] To ensure that water injection wells at each stage of development can achieve "sufficient water injection and good water injection", thanks to the efforts of many petroleum workers, a series of special tools and supporting technologies for stratified water injection technology have been developed.

[0003] Wavecode communication sub-injection technology is a new type of water distributor that uses pressure or flow fluctuations to achieve signal transmission between surface equipment and downhole sub-injection instruments, thereby controlling the opening of the water nozzles in the downhole sub-injection instrument and receiving downhole data returns. Wavecode sub-injection technology has advantages such as high flow measurement and adjustment accuracy, and high pressure and temperature resistance of the instrument. In addition to pressure wave, the instrument adds flow wave as an auxiliary parameter for pressure wave communication, realizing dual communication of pressure wave and flow wave. This solves the problems of slow speed and high error rate when relying solely on pressure wave communication, and improves the accuracy, timeliness and availability of decoding and wavecode communication. Wavecode sub-injection technology can solve problems such as remote wireless communication from downhole to the surface and real-time transmission of downhole stratified pressure (flow) during the entire process of sub-injection well monitoring, realizing the water injection development goal of "good water injection and sufficient water injection", thereby deriving a reasonable allocation test cycle, improving the effectiveness of water injection, and achieving the purpose of guiding oilfield development and precise water injection.

[0004] However, in order to understand the authenticity of the layered flow in the wavecode sub-injection system, it is necessary to periodically remeasure the downhole flow. The remeasurement mainly includes the remeasurement of the flow of the surface electromagnetic flowmeter and the remeasurement of the flow of the downhole intelligent sub-injection instrument. The accuracy of the remeasurement directly affects the authenticity of the wavecode sub-injection system. Therefore, we propose a flow remeasurement process and operation method suitable for wavecode communication sub-injection. Summary of the Invention

[0005] The purpose of this invention is to provide a flow retesting process and operation method suitable for wavecode communication sub-injection.

[0006] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0007] A flow re-measurement process suitable for wavecode communication injection includes a ground electromagnetic valve flow meter, a standard metering tank, an injection wellhead, tubing, a high-precision electromagnetic flow meter, a wavecode water distributor, a packer, a ball seat, a pre-set working cylinder, a screen pipe, and a ground early warning device. The pre-set working cylinder is installed on the inner wall of the well. The wavecode water distributor is connected to the ground early warning device and the downhole tubing. The packer is adapted to the pre-set working cylinder. The upper end of the wavecode water distributor is connected to the injection wellhead via tubing. The ground electromagnetic valve flow meter and the standard metering tank are connected via pipelines. The lower end of the wavecode water distributor is connected to a ball seat and a screen pipe via pipelines.

[0008] The flow retesting process mainly consists of the following steps:

[0009] Step 1: Calibrate the ground solenoid valve flow meter in the water distribution room using the standard metering tank: Connect the water inlet pipe of the standard metering tank to the outlet port of the ground solenoid valve flow meter. Compare the water volume of the standard metering tank with the measurement data of the ground solenoid valve flow meter to calibrate the measurement accuracy of the ground solenoid valve flow meter. The specified error is less than ±5%, and the stratified flow rate can be tested normally in the well. If the error exceeds ±5%, calibration should be performed on-site or at the factory. Test again after the conditions are met.

[0010] Step 2: Measure the flow rate at different well depths using oxygen activation or isotope flow meters: Conduct flow rate tests at five stopping points: 500m, 1500m, above the upper fitting, between the two fittings, and ball seat, for 20 minutes each.

[0011] Step 3: Use a calibrated electromagnetic flowmeter for suspended testing: Conduct flow tests at five stopping points at well depths of 500m, 1500m, above the upper assembly, between the two assemblies, and the ball seat, and test for 20 minutes at each location.

[0012] Step 4: Single-layer function verification and testing: Close the lower-layer wave code water distributor by marking the ground, stabilize the pressure to the previous pressure, and conduct flow tests at three stop points: between the two distributors, above the upper distributor, and 500m, for 20 minutes each.

[0013] Step 5: Layered traffic for code scanning: Layered traffic for each layer when scanning codes on the ground.

[0014] Step 6: Data Comparison: Compare the traffic data from the overhead line test with the traffic data from the code-breaking test.

[0015] Preferably, the standard metering tank has a standard size of 500L. The absolute value of the difference between the cumulative flow value of the ground solenoid valve flow meter before calibration and the cumulative flow value of the ground solenoid valve flow meter after calibration is compared with the absolute value of the difference between the standard metering tank size of 500L and the standard metering tank size. When the comparison value is less than the cumulative flow error, the stratified flow rate is tested normally in the field and downhole. When the comparison value is greater than the cumulative flow error, calibration is performed in the field or at the factory, and the test is performed again after the conditions are met.

[0016] Preferably, the oxygen activation or isotope-based flow measurement is required to be within the service life of the radioactive source; the lower limit of oxygen activation measurement must meet the measurement error of less than cubic meters of flow rate; and the length of the entire measuring tool section should not affect the wellbore injection pressure after being lowered into the wellbore, thus avoiding large deviations in stratified flow rates.

[0017] Preferably, the high-precision electromagnetic flowmeter must meet the 2% accuracy requirement and be calibrated regularly; the placement position of the high-precision electromagnetic flowmeter must be far away from the wavecode water distributor, and the distance between the placement position of the high-precision electromagnetic flowmeter and the wavecode water distributor must be greater than 10 meters, with a dwell time of more than 5 minutes at each point.

[0018] Preferably, when the wavecode water distributor reads the stratified flow rate, there should be no tools in the wellbore, otherwise it will affect the stratified flow rate and the success rate of wavecode communication; the read downhole flow rate value is measured by the stratified water distributor, and the flow meters of each water distributor are different and need to be calibrated according to a unified standard.

[0019] Preferably, if the downhole stratified data of the ground early warning device fails to be uploaded for three consecutive times, the ground controller determines that there is an abnormality downhole and issues an early warning for the corresponding stratum; if the downhole uploaded flow rate data exceeds the injection error range and fails to meet the requirements for three consecutive times, an early warning is issued for the corresponding stratum.

[0020] Preferably, the wave code water distributor includes an upper connector, piston ring, slip ring, locking ring, slide rail, slide rail pin, rubber sleeve retaining ring, milled pin, liner, central tube, spacer ring, push ring, balance ring, balance sleeve, valve core, lever, lever frame, pressure guide plug, piston, piston sleeve, well washing piston, connecting ring, anti-jamming ring, release pin, snap ring, snap ring seat, separator ring, setting pin, pressure bearing sleeve, valve seat, lower connector, protective wire, switch rod, anti-reverse rod, spring, circuit frame, circuit frame, side rubber sleeve, middle rubber sleeve, and magnet.

[0021] Preferably, the upper connector is connected to the locking ring via threads, the locking ring is connected to the slide via a slide pin, the piston ring is connected to the upper connector via threads, the magnet is locked below the piston ring, the slide ring is connected to the locking ring via a slide pin, the slide is connected to the central tube via threads, the rubber sleeve retaining ring is connected to the liner via milled pins, the connecting side rubber sleeve, spacer ring, and middle rubber sleeve are fitted onto the liner, the push ring is also fitted onto the liner, the balance sleeve is sealed with a balance ring, the valve core is tightly installed on the balance ring via a rubber ring, the lever frame is placed in the air cavity, the pressure valve core and pressure guide plug are placed inside the balance ring, the circuit frame is fitted onto the liner, the piston sleeve and piston are connected via threads, and the well-washing piston is placed... Outside the piston sleeve, the connecting ring is connected to the piston sleeve by threads, the snap ring sleeve is connected to the connecting ring by threads, the anti-snagging ring is placed outside the snap ring sleeve, the snap ring seat and snap ring are connected to the central tube by a release pin, the lower end of the pressure-bearing sleeve is connected to the lower connector by threads, the separating ring is connected to the snap ring sleeve by threads, the pressure guide plug is placed below the separating ring, the lower valve core is placed on the valve seat, the lever frame, lever, pressure valve core, and setting pin are all fitted and connected to the valve seat, the separating ring is connected to the central tube by threads, the circuit frame is placed in the air cavity between the central tube and the pressure-bearing sleeve, the spring, switch rod, and anti-reverse rod are connected by threads to form an integral part and placed in the lower connector, and the protective wire is connected to the lower connector by threads.

[0022] This invention has at least the following beneficial effects:

[0023] This invention ensures the accuracy of retest data through the calibration of electromagnetic flowmeters and standard metering tanks, and calibrates multiple well depths for measurement. It also adapts to the layered flow coding of wavecode water distributors, making the overall flow retest process more convenient and faster. Meanwhile, the ground-based early warning equipment facilitates the monitoring of the accuracy of the overall flowmeter, improving the automation level of the retest process and increasing work efficiency. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a schematic diagram of the operation method of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the wavecode water distributor structure of the present invention;

[0028] Figure 4This is a partial structural diagram of the upper connector of the present invention;

[0029] Figure 5 This is a partial structural diagram of the lower connector of the present invention.

[0030] In the diagram, 1. Surface solenoid valve flow meter; 2. Standard metering tank; 3. Water injection wellhead; 4. Oil pipe; 5. High-precision electromagnetic flow meter; 6. Waveform water distributor; 7. Packer; 8. Ball seat; 9. Pre-set working cylinder; 10. Screen pipe; 11. Surface early warning equipment; 101. Upper connector; 102. Piston ring; 103. Slip ring; 104. Locking ring; 105. Slide; 106. Slide pin; 107. Rubber sleeve retaining ring; 108. Milled pin; 109. Liner; 110. Center pipe; 111. Spacer ring; 112. Push ring; 113. Balance ring; 114. Balance sleeve; 115. Valve 116. Core; 117. Lever; 118. Lever frame; 119. Pressure guide plug; 120. Piston; 121. Piston sleeve; 122. Well washing piston; 123. Connecting ring; 124. Anti-jamming ring; 125. Unsealing pin; 126. Snap ring seat; 127. Separating ring; 128. Setting pin; 129. Pressure bearing sleeve; 130. Valve seat; 131. Lower connector; 132. Protective wire; 133. Switch rod; 134. Anti-reverse rod; 135. Spring; 136. Circuit frame 74; 137. Circuit frame 66; 138. Side rubber tube; 139. Middle rubber tube; 140. Magnet. Detailed Implementation

[0031] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0032] Example 1: As Figures 1-5 As shown, this embodiment provides a flow re-measurement process and operation method suitable for wavecode communication injection, including a ground electromagnetic valve flowmeter 1, a standard metering tank 2, an injection wellhead 3, an oil pipe 4, a high-precision electromagnetic flowmeter 5, a wavecode water distributor 6, a packer 7, a ball seat 8, a pre-set working cylinder 9, a screen pipe 10, and a ground early warning device 11. The pre-set working cylinder 9 is installed on the inner wall of the well. The wavecode water distributor 6 is connected to the ground early warning device 11. The wavecode water distributor 6 is connected to the oil pipe 4 in the well. The packer 7 is adapted to the pre-set working cylinder 9. The upper end of the wavecode water distributor 6 is connected to the injection wellhead 3 through the oil pipe 4. The ground electromagnetic valve flowmeter 1 and the standard metering tank 2 are connected through a pipeline. The lower end of the wavecode water distributor 6 is connected to the ball seat 8 and the screen pipe 10 through a pipeline.

[0033] This invention ensures the accuracy of retest data through the calibration of the electromagnetic flowmeter and standard metering tank 2, and calibrates multiple well depth locations for measurement. It also adapts to the layered flow coding of the wavecode water distributor 6, making the overall flow retest process more convenient and faster. Furthermore, the ground-based early warning device 11 facilitates monitoring of the overall flowmeter accuracy, improving the automation level of the retest process and increasing work efficiency.

[0034] Example 2: Figure 3 , Figure 4 and Figure 5 As shown, the wavecode water distributor 6 includes an upper connector 101, a piston ring 102, a slip ring 103, a locking ring 104, a slide rail 105, a slide rail pin 106, a rubber sleeve retaining ring 107, a milled pin 108, a liner 109, a central tube 110, a spacer ring 111, a push ring 112, a balance ring 113, a balance sleeve 114, a valve core 115, a lever 116, a lever bracket 117, a pressure guide plug 118, a piston 119, and a piston sleeve 12. 0. Well washing piston 121, connecting ring 122, anti-jamming ring 123, unsealing pin 124, snap ring 125, snap ring seat 126, separating ring 127, setting pin 128, pressure sleeve 129, valve seat 130, lower connector 131, wire protector 132, switch rod 133, anti-reverse rod 134, spring 135, circuit frame 74 136, circuit frame 66 137, side rubber sleeve 138, middle rubber sleeve 139, and magnet 140.

[0035] The upper connector 101 is connected to the locking ring 104 via threads. The locking ring 104 is connected to the slide rail 105 via the slide rail pin 106. The piston ring 102 is connected to the upper connector 101 via threads. The magnet 140 is locked below the piston ring 102. The slip ring 103 is connected to the locking ring 104 via the slide rail pin 106. The slide rail 105 is connected to the central tube 110 via threads. The rubber sleeve retaining ring 107 is connected to the liner 109 via the milled pin 108. The connecting side rubber sleeve 138 and the partition... Ring 111 and middle rubber sleeve 139 are fitted onto liner 109. Push ring 112 is also fitted onto liner 109. Balance sleeve 114 is sealed with balance ring 113. Valve core 115 is tightly installed on balance ring 113 via rubber ring. Lever bracket 117 is placed in air cavity. Pressure valve core 115 and pressure guide plug 118 are placed inside balance ring 113. Circuit bracket 74136 is fitted onto liner 109. Piston sleeve 120 and piston 119 are connected by threads. Well washing piston 121 The connecting ring 122 is threaded to the piston sleeve 120, and the retaining ring sleeve is threaded to the connecting ring 122. The anti-jamming ring 123 is placed outside the retaining ring sleeve. The retaining ring seat 126 and the retaining ring 125 are connected to the central tube 110 through the release pin 124. The lower end of the pressure bearing sleeve 129 is threaded to the lower connector 131. The separator ring 127 is threaded to the retaining ring sleeve. The pressure guide plug 118 is placed below the separator ring 127. The lower valve core 115 is placed... On the valve seat 130, the lever frame 117, lever 116, clamping valve core 115, and setting pin 128 are all fitted and connected to the valve seat 130. The separator ring 127 is connected to the central tube 110 by a thread. The circuit frame 66137 is placed in the air cavity between the central tube 110 and the pressure sleeve 129. The spring 135, switch rod 133, and anti-reverse rod 134 are connected by a thread to form an integral part and placed in the lower connector 131. The protective wire 132 is connected to the lower connector 131 by a thread.

[0036] Among them, the pressure guide plug 118 is a soluble metal. If the circuit frame 74136 fails, the pressure guide plug 118 will dissolve. At the same time, the casing water pressure enters the balance ring 113 and the balance sleeve 114 to form a balance, causing the packer to enter the unsealing state. At the same time, when the lifting string fails, the string rotates to disengage the upper connector 101, piston ring 102, slip ring 103, locking ring 104, and slide pin 106, leaving all other components such as slide 105 and central tube 110 in the well. A milling tool is lowered to grind the rubber sleeve retaining ring 17, and the side rubber sleeve 138 and the middle rubber sleeve 139 slide upward to complete the unsealing.

[0037] Example 3: Figure 1 , Figure 2 As shown, a flow retesting process suitable for wavecode communication sub-speech mainly consists of the following steps:

[0038] Step 1: Calibrate the ground solenoid valve flow meter 1 in the water distribution room using standard metering tank 2: Connect the water inlet pipe of standard metering tank 2 to the outlet port of ground solenoid valve flow meter 1. Compare the measurement data of the water volume 2 in the standard metering tank with that of ground solenoid valve flow meter 1 to calibrate the measurement accuracy of ground solenoid valve flow meter 1. The specified error is less than ±5%, and the stratified flow rate can be tested normally in the well. If the error exceeds ±5%, calibration should be performed on-site or at the factory. Test again after the conditions are met.

[0039] Step 2: Measure the flow rate at different well depths using oxygen activation or isotope flow meters: conduct flow rate tests at well depths of 500m, 1500m, above the upper part, between the two parts, and at 85 stopping points on the ball seat, and test for 20 minutes at each location.

[0040] Step 3: Use a calibrated electromagnetic flowmeter for suspended testing: conduct flow tests at well depths of 500m, 1500m, above the upper assembly, between the two assemblies, and at 85 stopping points on the ball seat, and test for 20 minutes at each location.

[0041] Step 4: Single-layer function verification and testing: Close the lower-layer wave code water distributor 6 by marking the ground, stabilize the pressure to the previous pressure, and conduct flow tests at three stop points: between the two distributors, above the upper distributor, and 500m, for 20 minutes each.

[0042] Step 5: Layered traffic for code scanning: Layered traffic for each layer when scanning codes on the ground.

[0043] Step 6: Data Comparison: Compare the traffic data from the overhead line test with the traffic data from the code-breaking test.

[0044] Example 4: Figure 1 As shown, the standard metering tank 2 has a standard size of 500L. The absolute value of the difference between the cumulative flow value of the ground solenoid valve flow meter 1 before calibration and the cumulative flow value of the ground solenoid valve flow meter 1 after calibration is compared with the absolute value of the difference between the standard metering tank 2 (500L). When the comparison value is less than the cumulative flow error, the stratified flow rate is tested normally in the field and downhole. When the comparison value is greater than the cumulative flow error, calibration is performed on-site or at the factory, and the test is conducted again after the conditions are met.

[0045] For oxygen activation or isotope-based flow measurement, the radiation source must be within its service life; the lower limit for oxygen activation measurement must meet the measurement error of less than 5 cubic meters per minute for small flow rates; the entire length of the measuring tool section must not affect the wellbore injection pressure after being lowered into the wellbore, thus avoiding large deviations in stratified flow rates.

[0046] The high-precision electromagnetic flow meter 5 must meet the 2% accuracy requirement and be calibrated regularly. The high-precision electromagnetic flow meter 5 must be placed far away from the wavecode water distributor 6, and the distance between the placement of the high-precision electromagnetic flow meter 5 and the wavecode water distributor 6 must be greater than 10 meters. The dwell time at each point must be greater than 5 minutes.

[0047] When the wavecode water distributor 6 reads the stratified flow rate, there must be no tools in the wellbore, otherwise it will affect the success rate of stratified flow rate and wavecode communication. The read downhole flow rate value is measured by the stratified water distributor, and the flow meters of each water distributor are different and need to be calibrated according to a unified standard.

[0048] When the downhole stratified data of the ground early warning device 11 fails to be uploaded for three consecutive times (due to water distributor failure: water nozzle blockage, insufficient battery power, actuator failure, packer failure, ball seat leakage), the ground controller judges that there is an abnormality downhole and issues an early warning for the corresponding stratum. If the downhole uploaded flow rate data exceeds the injection error range and fails to meet the requirements for three consecutive times (due to large inter-stratum pressure difference preventing injection, under-injection of a certain stratum, etc.), an early warning for the corresponding stratum is issued (manual intervention or measures).

[0049] This invention ensures the accuracy of the electromagnetic flowmeter and improves the accuracy of retest data. Multi-point layered coding allows for flow monitoring, enables synchronous comparison of multiple data points, facilitates the elimination of interference during testing, and improves work efficiency.

[0050] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0051] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.

[0052] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A flow re-measurement process suitable for wavecode communication-based injection, comprising a ground electromagnetic valve flowmeter (1), a standard metering tank (2), an injection wellhead (3), an oil pipe (4), a high-precision electromagnetic flowmeter (5), a wavecode water distributor (6), a packer (7), a ball seat (8), a pre-set working cylinder (9), a screen pipe (10), and a ground early warning device (11), characterized in that, The pre-set working cylinder (9) is installed on the inner wall of the well. The wavecode water distributor (6) is connected to the ground early warning device (11). The wavecode water distributor (6) is connected to the oil pipe (4) in the well. The packer (7) is adapted to the pre-set working cylinder (9). The upper end of the wavecode water distributor (6) is connected to the water injection wellhead (3) through the oil pipe (4). The ground electromagnetic valve flow meter (1) and the standard metering tank (2) are connected through the pipeline. The lower end of the wavecode water distributor (6) is connected to the ball seat (8) and the screen pipe (10) through the pipeline. The flow retesting process mainly consists of the following steps: Step 1: Calibrate the ground electromagnetic valve flow meter (1) in the water distribution room by standard metering tank (2): Lead the water inlet of the standard metering tank (2) out with a water pipe to the outlet port of the ground electromagnetic valve flow meter (1), compare the water volume (2) of the standard metering tank with the metering data of the ground electromagnetic valve flow meter (1), and calibrate the metering accuracy of the ground electromagnetic valve flow meter (1). The specified error is less than ±5%. Normal well test of layered flow on site. If the error exceeds ±5%, calibration should be performed on-site or at the factory, and testing should only be conducted after the conditions are met. Step 2: Measure the flow rate at different well depths by using oxygen activation or isotope flow meters: Measure the flow rate at five stopping points at well depths of 500m, 1500m, above the upper part, between the two parts, and ball seat (8), and test for 20 minutes at each point. Step 3: Use a calibrated electromagnetic flowmeter to perform flow tests at five stopping points: well depths of 500m, 1500m, above the upper fitting, between the two fittings, and ball seat (8), for 20 minutes each. Step 4: Single-layer function verification and testing: Close the lower layer wave code water distributor (6) by marking the ground, stabilize the pressure to the previous pressure, and conduct flow tests at three stop points: between the two distributors, above the upper distributor, and 500m, for 20 minutes each; Step 5: Layered traffic for code scanning: Layered traffic should be used for each layer of code scanning on the ground. Step 6: Data Comparison: Compare the traffic data from the overhead line test with the traffic data from the code-breaking test.

2. The flow retesting process for wavecode communication sub-beads according to claim 1, characterized in that: The standard metering tank (2) adopts a size standard of 500L. The absolute value of the difference between the cumulative flow value of the ground solenoid valve flow meter (1) before calibration and the cumulative flow value of the ground solenoid valve flow meter (1) after calibration is compared with the absolute value of the difference between the standard metering tank (2) of 500L. When the comparison value is less than the cumulative flow error, the stratified flow rate is tested normally in the field. When the comparison value is greater than the cumulative flow error, calibration should be performed on-site or at the factory, and testing should only be conducted after the conditions are met.

3. The flow retesting process for wavecode communication sub-beads according to claim 1, characterized in that: The oxygen activation or isotope-based flow measurement must be performed within the lifespan of the radioactive source; the lower limit of oxygen activation measurement must meet the measurement error of less than 5 cubic meters per minute for small flow rates; the entire length of the measuring tool section must not affect the wellbore injection pressure after being lowered into the wellbore, thus avoiding large deviations in stratified flow rates.

4. The flow retesting process for wavecode communication sub-beads according to claim 1, characterized in that: The high-precision electromagnetic flowmeter (5) must meet the 2% accuracy requirement and be calibrated regularly. The high-precision electromagnetic flowmeter (5) must be placed far away from the wavecode water distributor (6), and the distance between the placement of the high-precision electromagnetic flowmeter (5) and the wavecode water distributor (6) must be greater than 10 meters. The dwell time at each point must be greater than 5 minutes.

5. The flow retesting process for wavecode communication sub-beads according to claim 1, characterized in that: When the wavecode water distributor (6) reads the stratified flow rate, there must be no tools in the wellbore, otherwise it will affect the stratified flow rate and the success rate of wavecode communication. The read downhole flow rate value is measured by the stratified water distributor, and the flow meters of each water distributor are different and need to be calibrated according to a unified standard.

6. The flow retesting process for wavecode communication sub-beads according to claim 1, characterized in that: When the downhole layered data of the ground early warning device (11) fails to be uploaded for three consecutive times, the ground controller judges that there is an abnormality downhole and the corresponding layer will issue an early warning for downhole fault; if the downhole uploaded flow rate data exceeds the injection error range and fails to meet the requirements for three consecutive times, the corresponding layer will issue an early warning.

7. The flow retesting process for wavecode communication sub-beads according to claim 1, characterized in that: The wavecode water distributor (6) includes an upper connector (101), a piston ring (102), a slip ring (103), a locking ring (104), a slide rail (105), a slide rail pin (106), a rubber sleeve retaining ring (107), a milled pin (108), a liner (109), a central tube (110), a spacer ring (111), a push ring (112), a balance ring (113), a balance sleeve (114), a valve core (115), a lever (116), a lever frame (117), a pressure guide plug (118), a piston (119), and a piston sleeve (120). ), well washing piston (121), connecting ring (122), anti-jamming ring (123), unsealing pin (124), snap ring (125), snap ring seat (126), separating ring (127), setting pin (128), pressure sleeve (129), valve seat (130), lower connector (131), wire protector (132), switch rod (133), anti-reverse rod (134), spring (135), circuit frame 74 (136), circuit frame 66 (137), side rubber tube (138), middle rubber tube (139), and magnet (140).

8. A flow retesting process suitable for wavecode communication sub-beads according to claim 7, characterized in that: The upper connector (101) is connected to the locking ring (104) via threads. The locking ring (104) is connected to the slide rail (105) via a slide rail pin (106). The piston ring (102) is connected to the upper connector (101) via threads. The magnet (140) is locked below the piston ring (102). The sliding ring (103) is connected to the locking ring (104) via a slide rail pin (106). The slide rail (105) is connected to the central tube (110) via threads. The rubber sleeve retaining ring (107) is connected to the liner (109) via a milled pin (108). The connecting side rubber sleeve (13) 8) The spacer ring (111) and the middle rubber sleeve (139) are fitted onto the liner (109), the push ring (112) is also fitted onto the liner (109), the balance sleeve (114) is sealed with the balance ring (113), the valve core (115) is tightly installed on the balance ring (113) by a rubber ring, the lever frame (117) is placed in the air cavity, the pressure valve core (115) and the pressure guide plug (118) are placed inside the balance ring (113), the circuit frame 74 (136) is fitted onto the liner (109), the piston sleeve (120) and the piston (119) are connected by threads, and the well washing... The piston (121) is placed outside the piston sleeve (120). The connecting ring (122) is connected to the piston sleeve (120) by threads. The snap ring sleeve is connected to the connecting ring (122) by threads. The anti-snagging ring (123) is placed outside the snap ring sleeve. The snap ring seat (126) and snap ring (125) are connected to the central tube (110) by a release pin (124). The lower end of the pressure-bearing sleeve (129) is connected to the lower connector (131) by threads. The separator ring (127) is connected to the snap ring sleeve by threads. The pressure guide plug (118) is placed below the separator ring (127). The lower valve core (129) is placed outside the piston sleeve (120). 15) Placed on the valve seat (130), the lever frame (117), lever (116), pressing valve core (115), and seat pin (128) are all fitted and connected to the valve seat (130). The separator ring (127) is connected to the central tube (110) by a thread. The circuit frame 66 (137) is placed in the air cavity between the central tube (110) and the pressure sleeve (129). The spring (135), switch rod (133), and anti-reverse rod (134) are connected by a thread to form an integral part and placed in the lower connector (131). The protective wire (132) is connected to the lower connector (131) by a thread.

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