CN113374458B - Intelligent stratified water injection device - Google Patents

Abstract

The invention relates to an intelligent stratified water injection device, wherein the upper end of a shell is screwed with an upper water injection joint, the lower end of the shell is screwed with a lower water injection joint, the lower part of a central hole of the upper water injection joint is connected with an upper joint offset hole which is axially communicated, the lower part of an inner cavity of the lower water injection joint is provided with a lower joint offset hole which is axially communicated, and the lower port of the upper joint offset hole is connected and communicated with the upper end of the lower joint offset hole through a sieve tube; the underwater injection joint is also provided with a lower joint axial connecting hole parallel to the lower joint offset hole, the side wall of the middle part of the underwater injection joint is provided with a stratum water injection port, and the stratum water injection port extends inwards along the radial direction and is communicated with the lower end of the lower joint axial connecting hole; an intelligent water distributor is installed on the lower portion of an inner cavity of the shell, the axis of the intelligent water distributor is parallel to the axis of the sieve tube, and a water outlet at the lower end of the intelligent water distributor is communicated with the upper end of the axial connecting hole of the lower connector. The device can realize the accurate water injection to the stratum of place to do not influence the water injection of stratum below and the well of cominging in and going out of instrument.

Description

Intelligent stratified water injection device

Technical Field

The invention relates to a separate-layer water injection well in the field of petroleum and natural gas, in particular to an intelligent separate-layer water injection device, and belongs to the technical field of separate-layer water injection.

Background

After the oil field is put into development, the oil layer pressure is continuously reduced along with the increase of the exploitation time, so that the yield of the oil well is greatly reduced, even the spraying and the production stop can be realized, at the moment, in order to make up for the underground vacancy caused by the exploitation of the crude oil, the oil layer pressure is maintained and improved, the high and stable yield of the oil field is realized, and the oil layer is injected with water.

The separated layer water injection implements water injection by the packer and the control of a water nozzle, so that the high-medium low-permeability stratum can play a role of water injection, the separated layer water injection is a main effective means for solving the interlayer contradiction, and the separate injection rate of the domestic oil field water injection well reaches more than 80 percent. Because the workload of wired measurement and adjustment is large and hysteresis exists, technicians consider how to implement intelligent dispensing.

The intelligent separate injection technology utilizes wireless communication to master underground separate injection dynamic in real time, timely adjusts the underground separate injection dynamic, avoids ground professional tests, greatly reduces operation workload and cost, and realizes fine water injection. Therefore, the intelligent separate injection technology is a future development trend of the water injection well of the oil field and is an important component for building the digital oil field. Meanwhile, the intelligent separate injection can solve the difficult problems of separate injection testing and adjustment of a large-slope directional well and a horizontal well.

The intelligent separate injection wireless communication adopts sound waves, electromagnetic waves and pressure waves, realizes wireless transmission between the ground controller and the intelligent water distributor by taking water as a medium, and can achieve the purpose of real-time measurement and adjustment. The former two have high transmission rate, and because of the need of relay, the power consumption is large, and the former two can not be used for the water injection well producing for a long time. In the aspect of wireless intelligent transmission in the water injection well underground, mainly still concentrate on in the aspect of pressure wave transmission, pressure wave transmission distance is long, and is with low costs, but pressure wave transmission speed is slow, and research and application are less at home and abroad, and domestic mainly promotes propagation velocity through encoding and decoding technique, does not have according to actual conditions and the scheme that needs carry out system's consideration yet.

The design of the intelligent water distributor is the core of intelligent separate injection wireless communication, when the intelligent water distributor works, the ground controller sends a group of specific pressure codes, and the intelligent water distributor completes the adjustment of the opening degree of the water nozzle after analyzing the pressure codes. The effective pressure pulse coding and decoding is an important link for realizing the cableless two-way communication of ground and underground instructions and data, the conventional pressure pulse coding and decoding is realized based on a standard square wave sequence, the pressure distribution of a shaft of a water injection well is a dynamic process, the standard square wave sequence cannot be formed, and the decoding error rate is higher.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide an intelligent zonal water injection device which can realize accurate water injection on the stratum and does not influence the water injection of the stratum below and the access of instruments.

In order to solve the technical problems, the intelligent layered water injection device comprises a shell, wherein the upper end of the shell is screwed with a water injection upper joint, the lower end of the shell is screwed with a water injection lower joint, the lower part of a central hole of the water injection upper joint is connected with an upper joint offset hole which is axially communicated, the lower part of an inner cavity of the water injection lower joint is provided with a lower joint offset hole which is axially communicated, and a lower port of the upper joint offset hole is connected with and communicated with the upper end of the lower joint offset hole through a sieve tube; the underwater injection joint is also provided with a lower joint axial connecting hole parallel to the lower joint offset hole, the side wall of the middle part of the underwater injection joint is provided with a stratum water injection port, and the stratum water injection port extends inwards along the radial direction and is communicated with the lower end of the lower joint axial connecting hole; an intelligent water distributor is installed on the lower portion of the inner cavity of the shell, the axis of the intelligent water distributor is parallel to the axis of the sieve tube, and a water outlet at the lower end of the intelligent water distributor is communicated with the upper end of the axial connecting hole of the lower connector.

As the improvement of the invention, the upper end of the intelligent water distributor is screwed with a sealing cylinder, and a master control circuit is arranged in the inner cavity of the sealing cylinder; the upper end of the sealing cylinder is screwed with a sensor short section, and the circumference of the sensor short section is screwed with an internal pressure sensor for monitoring the pressure in the pipe and an external pressure sensor for monitoring the formation pressure; the side wall of the middle part of the underwater injection joint is also provided with a stratum pressure sampling port, and the inner end of the stratum pressure sampling port is connected with the signal input end of the external pressure sensor through a stratum pressure signal pipe; the upper end of the sensor short section is connected with a sealed battery installation barrel in a rotating mode, and a high-temperature-resistant battery is installed in the inner cavity of the battery installation barrel.

As a further improvement of the invention, the intelligent water distributor comprises a water distributor barrel, wherein the circumference of the middle section of the water distributor barrel is symmetrically provided with barrel water inlet holes which are radially communicated with the large-aperture section of the water distributor barrel; the lower end of the water distributor barrel is screwed with a lower water distributor joint in female threads at the lower end, the lower end of the lower water distributor joint is screwed with the upper end of an axial connecting hole of the lower joint, a fixed water nozzle is arranged above an upper port of the lower water distributor joint, a fixed overflow groove which is axially communicated is arranged on the fixed water nozzle, an opening control water nozzle is arranged at the upper end of the fixed water nozzle, the opening control water nozzle is positioned at a large-aperture section of the water distributor barrel, the upper end of the opening control water nozzle is fixedly connected with the bottom of a transmission shaft, the upper end of the transmission shaft is connected with an output shaft of a servo motor through a coupler, the servo motor is fixed at the upper end of the water distributor barrel and is positioned in an inner cavity of the sealing barrel, and the lower end of the sealing barrel is screwed with the periphery of the upper part of the water distributor barrel.

As a further improvement of the invention, the outer circumference of the fixed water nozzle is symmetrically provided with fixed water nozzle caulking grooves, the circumference of the water distributor barrel is symmetrically provided with threaded counter bores, water nozzle fixing screws are screwed in the threaded counter bores, the inner ends of the water nozzle fixing screws are embedded in the fixed water nozzle caulking grooves, and the fixed overflow grooves are two fan-shaped overflow grooves which are centrosymmetric; and an O-shaped ring is embedded in the sealing ring groove of the lower water distributor connector to realize sealing with the inner wall of the water distributor barrel, and the lower port of the water distributor barrel abuts against the middle shoulder of the lower water distributor connector.

As a further improvement of the invention, the opening control water nozzle is cylindrical, radial water inlet holes are symmetrically arranged on the circumference of the middle section of the opening control water nozzle, the radial water inlet holes and the water inlet holes of the barrel body are positioned on the same cross section, and two movable disk overflowing grooves are symmetrically arranged at the bottom of the opening control water nozzle.

As a further improvement of the invention, the upper end of the opening control water nozzle is provided with a linear caulking groove, and the center of the linear caulking groove is provided with a central positioning counter bore; the lower end of the transmission shaft is provided with a straight-line tenon in T-shaped connection with the transmission shaft, the center of the bottom of the straight-line tenon is provided with a central positioning boss, the straight-line tenon is embedded in the straight-line caulking groove, and the central positioning boss is embedded in the central positioning counter bore.

As a further improvement of the invention, a transmission shaft boss is arranged at the root part of the transmission shaft, the bottom of the transmission shaft boss is connected with the center of the straight tenon, a sealing ring is embedded between the periphery of the transmission shaft boss and the inner wall of the water distributor barrel, an annular inner embedded groove is arranged on the inner peripheral wall of the sealing ring, and an inner sealing element is embedded in the annular inner embedded groove to realize sealing with the transmission shaft boss; the outer peripheral wall of the sealing ring is provided with an annular outer embedded groove, and an outer sealing piece is embedded in the annular outer embedded groove to realize sealing with the inner wall of the water distributor barrel.

As a further improvement of the invention, a bearing base is arranged on the step of the boss of the transmission shaft, a bearing base core pipe extending upwards is arranged at the center of the bearing base, and the bearing base core pipe is sleeved on the periphery of the transmission shaft; a thrust bearing is arranged on the step of the bearing base, the top of the thrust bearing is propped against the lower part of the convex ring in the water distributor cylinder body, and a gap is reserved between the top of the thrust bearing and the bearing base core tube; and a pressure spring is arranged between the bottom of the fixed water nozzle and the upper port of the lower connector of the water distributor.

As a further improvement of the invention, the coupler is positioned above a convex ring in the water distributor cylinder, a water distributor control plate is arranged at the bottom of the servo motor, and an output shaft of the servo motor penetrates through the center of the water distributor control plate; motor fixing threaded holes are symmetrically formed in the circumference of the upper portion of the water distributor barrel, servo motor fixing screws are respectively screwed in the motor fixing threaded holes, and inner end heads of the servo motor fixing screws are fixed on the servo motors.

As a further improvement of the invention, a signal conditioning circuit, an MCU (microprogrammed control unit) main control chip and a motor control circuit are arranged on the water distributor control board, the signal conditioning circuit comprises an AD7794 chip, and the MCU main control chip is a PIC18F46 chip; the inner pressure sensor is provided with signal output ends AIN1+ and AIN1-, and the outer pressure sensor is provided with signal output ends AIN2+ and AIN 2-; a signal output end AIN1+ is connected with the 7 th pin of the AD7794 chip, a signal output end AIN 1-is connected with the 8 th pin of the AD7794 chip, a signal output end AIN2+ is connected with the 9 th pin of the AD7794 chip, and a signal output end AIN 2-is connected with the 10 th pin of the AD7794 chip; and a pin 24 of the AD7794 chip is connected with a pin 8 of the MCU main control chip, and a pin 23 of the AD7794 chip is connected with a pin 9 of the MCU main control chip.

Compared with the prior art, the invention has the following beneficial effects: water flow enters the sieve tube through the central hole of the water injection upper connector and the offset hole of the upper connector, enters the stratum below the sieve tube through the sieve tube on the one hand, flows out of the holes of the sieve tube to enter the inner cavity of the shell on the other hand, flows out of the intelligent water distributor, enters the stratum water injection port through the axial connecting hole of the lower connector, flows out of the stratum water injection port to inject water into the local stratum, and the water injection amount is accurately controlled by the intelligent water distributor. The inner cavity of the screen can be used as a passage for instruments to go into the well.

The upper parts of the intelligent water distributors are in a sealed state, the high-temperature-resistant batteries provide power for the whole device, and the internal pressure sensor directly monitors the pressure in the inner cavity of the shell; the stratum pressure sampling port and the stratum pressure signal pipe provide stratum pressure signals for the external pressure sensor, so that the control system can master stratum and pressure values in the pipe at the same time, and the opening of the intelligent water distributor can be controlled more accurately.

The internal pressure sensor is used for monitoring the pressure in the pipe and monitoring pressure waves at the same time, awakening an instrument and checking the seal, and the external pressure sensor is used for monitoring the formation pressure; the inner pressure sensor sends a pressure signal in the pipe to the AD7794 chip, and the outer pressure sensor sends a pressure signal of the stratum to the AD7794 chip, converts the pressure signal into a digital signal and sends the digital signal to the MCU main control chip; the MCU main control chip selects which path of pressure digital signal is read.

Drawings

The invention will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

FIG. 1 is a front view of the intelligent separated layer water injection device of the present invention.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is a cross-sectional view of fig. 1.

Fig. 4 is a front view of the intelligent water distributor of the present invention.

Fig. 5 is a cross-sectional view of fig. 4.

Fig. 6 is a perspective exploded view of fig. 4.

Fig. 7 is a schematic block diagram of a control system of the present invention.

Fig. 8 is an electrical schematic diagram of a signal conditioning circuit in the control system of the present invention.

FIG. 9 is a circuit diagram of the MCU master control chip in the control system of the present invention.

Fig. 10 is an electrical schematic diagram of the MCU main control chip in the control system of the present invention.

FIG. 11 is a schematic diagram of a motor control circuit in the control system of the present invention.

Fig. 12 is a decoding schematic diagram of the MCU main control chip in the control system of the present invention.

In the figure: 1. a servo motor; 2. a coupling; 3. a drive shaft; 3a, a straight tenon; 3b, positioning a boss at the center; 4. an opening control water nozzle; 4a, radial water inlet holes; 4b, a linear caulking groove; 4c, moving plate overflow grooves; 4d, centering the counter bore; 5. fixing the water nozzle; 5a, fixing a flow passing groove; 5b, fixing a water nozzle caulking groove; 6. a pressure spring; 7. a water distributor barrel; 7a, a water inlet of the cylinder body; 7b, a convex ring in the water distributor cylinder body; 7c, a threaded counter bore; 7d, fixing the threaded hole by the motor; 8. a thrust bearing; 9. a bearing base; 10. a seal ring; 10a, an annular embedded groove; 10b, an annular external caulking groove; 11. a water distributor control panel; 12. a lower joint of the water distributor; an O-ring.

14. A water injection upper joint; 14a. upper joint offset hole; 15. a housing; 16. injecting water into the underwater joint; 16a. lower joint offset hole; 16b, axially connecting holes of the lower joint; 16c, a formation water injection port; 16d, a formation pressure sampling port; 17. a screen pipe; 18. a high temperature resistant battery; 19. an external pressure sensor; 20. an internal pressure sensor; 21. a sealing cylinder; 22. and a master control circuit.

Detailed Description

As shown in fig. 1 to 3, the intelligent stratified water injection device of the invention comprises a housing 15, an upper water injection joint 14 is screwed on the upper end of the housing 15, a lower water injection joint 16 is screwed on the lower end of the housing 15, an upper joint offset hole 14a which axially penetrates is connected with the lower part of a central hole of the upper water injection joint 14, a lower joint offset hole 16a which axially penetrates is arranged on the lower part of an inner cavity of the lower water injection joint 16, and the lower port of the upper joint offset hole 14a is connected and penetrated with the upper end of the lower joint offset hole 16a through a sieve tube 17; a lower joint axial connecting hole 16b parallel to the lower joint offset hole 16a is further formed in the underwater injection joint 16, a stratum water injection port 16c is formed in the side wall of the middle of the underwater injection joint 16, and the stratum water injection port 16c extends inwards in the radial direction and is communicated with the lower end of the lower joint axial connecting hole 16 b; an intelligent water distributor is arranged at the lower part of the inner cavity of the shell 15, the axis of the intelligent water distributor is parallel to the axis of the sieve tube 17, and the water outlet at the lower end of the intelligent water distributor is communicated with the upper end of the axial connecting hole 16b of the lower joint.

Water flow enters the sieve tube 17 through the central hole of the upper water injection joint 14 and the offset hole 14a of the upper joint, on one hand, the water flow enters the lower stratum through the sieve tube 17, on the other hand, the water flow flows out of the holes of the sieve tube 17, enters the inner cavity of the shell 15, then flows out of the intelligent water distributor, enters the stratum water injection port 16c through the axial connecting hole 16b of the lower joint, flows out of the stratum water injection port 16c and injects water into the local stratum, and the water injection amount is accurately controlled by the intelligent water distributor. The inner cavity of the screen 17 can be used as a passage for instruments to be run into the well.

The upper end of the intelligent water distributor is screwed with a sealing cylinder 21, and a master control circuit 22 is installed in the inner cavity of the sealing cylinder 21; the upper end of the sealing cylinder 21 is screwed with a sensor short section, and the circumference of the sensor short section is screwed with an internal pressure sensor 20 for monitoring the pressure in the pipe and an external pressure sensor 19 for monitoring the formation pressure; a formation pressure sampling port 16d is also arranged on the side wall of the middle part of the underwater injection joint 16, and the inner end of the formation pressure sampling port 16d is connected with the signal input end of an external pressure sensor 19 through a formation pressure signal pipe; the upper end of the sensor short section is screwed with a sealed battery installation barrel, and a high-temperature-resistant battery 18 is installed in the inner cavity of the battery installation barrel. The upper parts of the intelligent water distributors are in a sealed state, a high-temperature-resistant battery 18 provides a power supply for the whole device, and an internal pressure sensor 20 directly monitors the pressure in the inner cavity of the shell 15; the stratum pressure sampling port 16d and the stratum pressure signal pipe provide stratum pressure signals for the external pressure sensor 19, so that the control system can simultaneously master stratum and pressure values in the pipe, and the opening of the intelligent water distributor can be controlled more accurately.

As shown in fig. 4 to 6, the intelligent water distributor of the invention comprises a water distributor cylinder 7, wherein cylinder water inlet holes 7a which are radially communicated with the large-aperture section of the water distributor cylinder are symmetrically arranged on the circumference of the middle section of the water distributor cylinder 7; the lower end of the water distributor barrel 7 is rotatably connected with a lower water distributor joint 12 in female threads, the lower end of the lower water distributor joint 12 is rotatably connected with the upper end of a lower joint axial connecting hole 16b, a fixed water nozzle 5 is arranged above an upper port of the lower water distributor joint 12, a fixed overflow groove 5a which is axially communicated is arranged on the fixed water nozzle 5, an opening control water nozzle 4 is arranged at the upper end of the fixed water nozzle 5, the opening control water nozzle 4 is positioned at a large-aperture section of the water distributor barrel, the upper end of the opening control water nozzle is fixedly connected with the bottom of a transmission shaft 3, the upper end of the transmission shaft 3 is connected with an output shaft of a servo motor 1 through a coupling 2, and the servo motor 1 is fixed at the upper end of the water distributor barrel 7.

The annular space on the upper part of the stratum is sealed by a packer, a plunger pump injects water into the well through a water injection pipe, water flow enters the inner cavity of the water distributor barrel through the barrel water inlet hole 7a, downwards enters the fixed overflow groove 5a on the fixed water nozzle 5 through the opening control water nozzle 4, and then is discharged from the lower connector 12 of the water distributor into the stratum. After the instruction of ground controller is received to intelligence water injection mandrel, servo motor 1's output shaft passes through 2 drive transmission shaft 3 rotations of shaft coupling, and the lower extreme of transmission shaft 3 drives aperture control water injection well choke 4 and rotates, shields or exposes gradually the fixed overflow groove 5a on the fixed water injection well choke 5 gradually, realizes the regulation of water injection volume.

The outer circumference of the fixed water nozzle 5 is symmetrically provided with fixed water nozzle caulking grooves 5b, the circumference of the water distributor barrel 7 is symmetrically provided with threaded counter bores 7c, water nozzle fixing screws are screwed in the threaded counter bores 7c, the inner end heads of the water nozzle fixing screws are embedded in the fixed water nozzle caulking grooves 5b, and the fixed overflow grooves 5a are two fan-shaped overflow grooves which are centrosymmetric; a lower water distributor joint sealing ring groove is arranged below the male thread at the upper end of the lower water distributor joint 12, an O-shaped ring 13 is embedded in the lower water distributor joint sealing ring groove to realize sealing with the inner wall of the water distributor cylinder 7, and the lower port of the water distributor cylinder 7 is abutted against the middle shoulder of the lower water distributor joint 12.

The water nozzle fixing screw realizes the radial fixation of the fixed water nozzle 5, and the rotation of the fixed water nozzle 5 is avoided; when the opening control water nozzle 4 rotates around the axis of the opening control water nozzle, the flow area of the two fan-shaped flow passing grooves on the fixed water nozzle 5 is gradually increased or gradually reduced, and the water injection amount is adjusted.

Openness control water injection well choke 4 is cylindric, and the symmetry is equipped with radial inlet opening 4a on its middle section circumference, and radial inlet opening 4a is located same cross section with barrel inlet opening 7a, and openness control water injection well choke 4's bottom symmetry is equipped with two driving disk overflow grooves 4c. The water flow enters the inner cavity of the opening control water nozzle 4 through the radial water inlet hole 4a and flows out of the movable disk overflow groove 4c at the bottom, the movable disk overflow groove 4c can also be in a fan shape, and when the movable disk overflow groove and the two fan-shaped overflow grooves on the fixed water nozzle 5 are completely opposite, the water injection amount reaches the maximum; when the opening control water nozzle 4 continues to rotate, the superposed area of the moving disc overflow groove 4c of the opening control water nozzle 4 and the two fan-shaped overflow grooves on the fixed water nozzle 5 is gradually reduced, and the water injection amount is reduced along with the superposed area; when the movable disc overflowing groove 4c on the opening control water nozzle 4 and the two fan-shaped overflowing grooves on the fixed water nozzle 5 are completely staggered, the water injection amount is 0.

For the convenience of linear cutting processing, the movable disc overflowing groove 4c of the opening control water nozzle 4 can be communicated with the top surface of the movable disc overflowing groove, and the upper space of the opening control water nozzle 4 is closed, so that the control of water injection quantity cannot be influenced.

The upper end of the opening control water nozzle 4 is provided with a linear caulking groove 4b, and the center of the linear caulking groove 4b is provided with a central positioning counter bore 4 d; the lower end of the transmission shaft 3 is provided with a straight tenon 3a which is connected with the transmission shaft in a T shape, the center of the bottom of the straight tenon 3a is provided with a central positioning boss 3b, the straight tenon 3a is embedded in the straight caulking groove 4b, and the central positioning boss 3b is embedded in a central positioning counter bore 4d. The fit of the straight tenon 3a and the straight caulking groove 4b realizes the radial positioning of the transmission shaft 3 and the opening control water nozzle 4, can transmit torque and drives the opening control water nozzle 4 to rotate; the central positioning boss 3b at the bottom of the straight tenon 3a is matched with the central positioning counter bore 4d of the straight caulking groove 4b, so that the coaxial line of the transmission shaft 3 and the opening control water nozzle 4 can be ensured.

The root of the transmission shaft 3 is provided with a transmission shaft boss, the bottom of the transmission shaft boss is connected with the center of the straight tenon 3a, a sealing ring 10 is embedded between the periphery of the transmission shaft boss and the inner wall of the water distributor barrel 7, the inner peripheral wall of the sealing ring 10 is provided with an annular inner embedded groove 10a, and an inner sealing element is embedded in the annular inner embedded groove 10a to realize sealing with the transmission shaft boss; the peripheral wall of the sealing ring 10 is provided with an annular external embedded groove 10b, and an external sealing element is embedded in the annular external embedded groove 10b to realize sealing with the inner wall of the water distributor barrel 7. The sealing ring 10 can prevent water below the transmission shaft 3 from entering the space of the thrust bearing 8, so that the thrust bearing 8 can be protected from oil loss, and more importantly, the water distributor control plate 11 and the servo motor 1 above the thrust bearing can be protected from water erosion, so that the intelligent water distributor can operate reliably for a long time underground.

A bearing base 9 is arranged on the step of the boss of the transmission shaft, a bearing base core pipe extending upwards is arranged at the center of the bearing base 9, and the bearing base core pipe is sleeved on the periphery of the transmission shaft 3; a thrust bearing 8 is arranged on a step of the bearing base 9, the top of the thrust bearing 8 is propped against the lower part of a convex ring 7b in the water distributor cylinder body, and a gap is reserved between the top of the thrust bearing 8 and a bearing base core tube; a pressure spring 6 is arranged between the bottom of the fixed water nozzle 5 and the upper port of the lower connector 12 of the water distributor. The step of transmission shaft boss provides axial positioning for bearing base 9, and bearing base core pipe provides the location for thrust bearing 8's lower part inner edge, and protruding circle 7b in the water distributor barrel provides the top location for thrust bearing 8, and the tension and the elasticity of pressure spring 6 make the top surface of fixed water injection well choke 5 and the bottom of aperture control water injection well choke 4 keep in close contact with, keep suitable tension, and compensate the axial error of aperture control water injection well choke 4 drive section.

The coupler 2 is positioned above a convex ring 7b in the water distributor cylinder, the bottom of the servo motor 1 is provided with a water distributor control plate 11, and an output shaft of the servo motor 1 penetrates through the center of the water distributor control plate 11; motor fixing threaded holes 7d are symmetrically formed in the circumference of the upper portion of the water distributor barrel 7, servo motor fixing screws are connected in the motor fixing threaded holes 7d in a screwed mode respectively, and inner end heads of the servo motor fixing screws are fixed to the servo motor 1. The boss of servo motor 1 lower part presses the upper port of water injection mandrel 7 and realizes the axial positioning of both, and the servo motor set screw who connects soon on the water injection mandrel 7 provides radial positioning for servo motor 1, controls the turned angle of water injection well choke 4 by servo motor 1 accurate control aperture, realizes the accurate control of water injection volume.

As shown in fig. 8 to 11, the signal conditioning circuit includes an AD7794 chip, and the MCU main control chip is a PIC18F46 chip; the inner pressure sensor 20 is provided with signal output ends AIN1+ and AIN1-, and the outer pressure sensor 19 is provided with signal output ends AIN2+ and AIN 2-; a signal output end AIN1+ is connected with the 7 th pin of the AD7794 chip, a signal output end AIN 1-is connected with the 8 th pin of the AD7794 chip, a signal output end AIN2+ is connected with the 9 th pin of the AD7794 chip, and a signal output end AIN 2-is connected with the 10 th pin of the AD7794 chip; and a pin 24 of the AD7794 chip is connected with a pin 8 of the MCU main control chip, and a pin 23 of the AD7794 chip is connected with a pin 9 of the MCU main control chip.

The internal pressure sensor 20 is used for monitoring the pressure in the pipe and monitoring pressure waves, awakening the instrument and checking the seal, and the external pressure sensor 19 is used for monitoring the formation pressure; the differential analog signal positive terminal AIN1+ and the differential analog signal negative terminal AIN1 of the internal pressure sensor 20 send pressure signals in the pipe to the 7 th pin and the 8 th pin of the AD7794 chip, the differential analog signal positive terminal AIN2+ and the differential analog signal negative terminal AIN2 of the external pressure sensor 19 send pressure signals of the ground layer to the 9 th pin and the 10 th pin of the AD7794 chip, the AD7794 chip converts the pressure signals into digital signals, and the digital signals are sent to the 9 th pin of the MCU master control chip through the 23 th pin of the AD7794 chip; and the 8 th pin of the MCU main control chip sends a control signal to the 24 th pin of the AD7794 chip and selects which path of pressure digital signal to read.

The signal conditioning circuit further comprises a temperature sensor LM94022 chip, a 1 st pin and a 4 th pin of the LM94022 chip are connected with a VCC-ADC, a 5 th pin of the LM94022 chip is grounded, a 2 nd pin of the LM94022 chip is grounded and is connected with a 12 th pin of the AD7794 chip, and a 3 rd pin of the LM94022 chip is connected with an 11 th pin of the AD7794 chip.

The LM94022 chip of the temperature sensor sends a downhole temperature signal to the 11 th pin and the 12 th pin of the AD7794 chip, so that on one hand, the downhole temperature is monitored and prevented from exceeding the tolerant temperature of a downhole instrument, on the other hand, the temperature compensation is carried out on the pressure signal, the electric quantity of the high-temperature-resistant battery 18 is corrected, and the temperature is also sent to the 9 th pin of the MCU main control chip through the 23 th pin of the AD7794 chip; and finishing the control signal of the MCU main control chip by a 24-pin of the AD7794 chip, and selecting to read.

The 36 th pin of the MCU master control chip is connected with the 3 rd pin of the MCP6542 chip, the 38 th pin of the MCU master control chip is connected with the 5 th pin of the MCP6542 chip, the 1 st pin of the MCP6542 chip is connected with the 19 th pin of the MC33887 chip, and the 7 th pin of the MCP6542 chip is connected with the 3 rd pin of the MC33887 chip; the 21 st pin of the MCU main control chip is connected with the VCC-ADC through a resistor R18 and is connected with the 2 nd pin of the MC33887 chip, the 6 th pin and the 7 th pin of the MCU main control chip are both connected with the forward rotation signal input end of the servo motor, and the 14 th pin and the 15 th pin of the MCU main control chip are both connected with the reverse rotation signal input end of the servo motor; the A phase interface of the servo motor encoder is connected with the VCC-ADC through a resistor R19 and is connected with the 11 th pin of the MCU main control chip; the interface B of the servo motor encoder is grounded through a resistor R20 and is connected with the 23 rd pin of the MCU main control chip; the No. 2 pin of the MC33887 chip is connected with the VCC-ADC through a resistor R18 and is connected with the No. 21 pin of the MCU main control chip.

The 36 th pin and the 38 th pin of the MCU main control chip send forward and reverse rotation signals of the servo motor to the 3 rd pin and the 5 th pin of the MCP6542 chip, the MCP6542 chip is a microchip double comparator, push-pull output is achieved, current supply capacity can be improved, and heavy direct current loads can be driven. The current amplified positive and negative rotation signals of the servo motor are sent to a pin 3 and a pin 19 of an MC33887 chip;

the MC33887 chip is a monolithic H-bridge power integrated circuit, is used as a servo motor driving chip, has a load current feedback function, is used for closed-loop direct-current servo motor control, can control inductive load, can achieve 5.0A of continuous DC load current, can effectively control peak current between 5.2A and 7.8A, and controls the positive and negative rotation of a servo motor through an OUT1 port and an OUT2 port of the MC33887 chip.

The servo motor encoder adopts a Hall encoder, has AB phase output, can not only measure the speed, but also can distinguish the steering, and feeds back the running state of the servo motor to the MCU main control chip.

The No. 2 pin of the MC33887 chip outputs the fault state of an H bridge for an FS port, is connected with 5.0V through a pull-up resistor R18, and feeds the fault state of the servo motor back to the MCU main control chip.

As shown in fig. 12, after receiving the pressure wave signal of the internal pressure sensor, the MCU master control chip filters the pressure wave signal to remove the fluctuation caused by noise and vibration, and compares the signal with the floating threshold baseline, and reads the threshold value above the floating threshold baseline as 1 and the threshold value below the floating threshold baseline as 0, thereby decoding the pressure wave.

The traditional decoding datum line of pressure waves is changed into a decoding datum line of a floating threshold curve, the floating threshold datum line is a median line between a wave crest and a wave trough, midpoints of pressure abrupt change sections are sequentially connected to form a floating threshold curve, the upper position of the floating threshold curve is the high position, the lower position of the floating threshold curve is the low position, the high position and the low position are more clear, the decoding error rate is reduced, and the communication success rate is improved.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.

Claims (8)

1. The utility model provides an intelligent stratified water injection device, includes the shell, the upper end of shell has connect the water injection top connection soon, the lower extreme of shell has connect the water injection bottom connection soon, its characterized in that: the lower part of the central hole of the water injection upper joint is connected with an axially through upper joint offset hole, the lower part of the inner cavity of the water injection lower joint is provided with an axially through lower joint offset hole, and the lower port of the upper joint offset hole is connected and communicated with the upper end of the lower joint offset hole through a sieve tube; the underwater injection joint is also provided with a lower joint axial connecting hole parallel to the lower joint offset hole, the side wall of the middle part of the underwater injection joint is provided with a stratum water injection port, and the stratum water injection port extends inwards along the radial direction and is communicated with the lower end of the lower joint axial connecting hole; an intelligent water distributor is arranged at the lower part of the inner cavity of the shell, the axis of the intelligent water distributor is parallel to the axis of the sieve tube, and a water outlet at the lower end of the intelligent water distributor is communicated with the upper end of the axial connecting hole of the lower joint;

the upper end of the intelligent water distributor is screwed with a sealing cylinder, and a master control circuit is installed in the inner cavity of the sealing cylinder; the upper end of the sealing cylinder is screwed with a sensor short section, and the circumference of the sensor short section is screwed with an internal pressure sensor for monitoring the pressure in the pipe and an external pressure sensor for monitoring the formation pressure; the middle side wall of the underwater injection joint is also provided with a formation pressure sampling port, and the inner end of the formation pressure sampling port is connected with the signal input end of the external pressure sensor through a formation pressure signal pipe; the upper end of the sensor short section is screwed with a sealed battery installation barrel, and a high-temperature-resistant battery is installed in the inner cavity of the battery installation barrel;

the intelligent water distributor comprises a water distributor barrel, wherein barrel water inlet holes which are radially communicated with the large-aperture section of the water distributor barrel are symmetrically formed in the circumference of the middle section of the water distributor barrel; the lower end of the water distributor barrel is screwed with a lower water distributor joint in female threads at the lower end, the lower end of the lower water distributor joint is screwed with the upper end of an axial connecting hole of the lower joint, a fixed water nozzle is arranged above an upper port of the lower water distributor joint, a fixed overflow groove which is axially communicated is arranged on the fixed water nozzle, an opening control water nozzle is arranged at the upper end of the fixed water nozzle, the opening control water nozzle is positioned at a large-aperture section of the water distributor barrel, the upper end of the opening control water nozzle is fixedly connected with the bottom of a transmission shaft, the upper end of the transmission shaft is connected with an output shaft of a servo motor through a coupler, the servo motor is fixed at the upper end of the water distributor barrel and is positioned in an inner cavity of the sealing barrel, and the lower end of the sealing barrel is screwed with the periphery of the upper part of the water distributor barrel.

2. The intelligent layered water injection apparatus according to claim 1, wherein: the outer circumference of the fixed water nozzle is symmetrically provided with fixed water nozzle caulking grooves, the circumference of the water distributor barrel is symmetrically provided with threaded counter bores, water nozzle fixing screws are screwed in the threaded counter bores, the inner ends of the water nozzle fixing screws are embedded in the fixed water nozzle caulking grooves, and the fixed overflow grooves are two fan-shaped overflow grooves which are centrosymmetric; and an O-shaped ring is embedded in the sealing ring groove of the lower water distributor connector to realize sealing with the inner wall of the water distributor barrel, and the lower port of the water distributor barrel abuts against the middle shoulder of the lower water distributor connector.

3. The intelligent layered water injection apparatus according to claim 1, wherein: the aperture control water injection well choke is cylindric, and the symmetry is equipped with radial inlet opening on its middle section circumference, radial inlet opening with the barrel inlet opening is located same cross section, the bottom symmetry of aperture control water injection well choke is equipped with two driving disk overflow grooves.

4. The intelligent layered water injection apparatus according to claim 3, wherein: the upper end of the opening control water nozzle is provided with a linear caulking groove, and the center of the linear caulking groove is provided with a central positioning counter bore; the lower end of the transmission shaft is provided with a straight-line tenon in T-shaped connection with the transmission shaft, the center of the bottom of the straight-line tenon is provided with a central positioning boss, the straight-line tenon is embedded in the straight-line caulking groove, and the central positioning boss is embedded in the central positioning counter bore.

5. The intelligent layered water injection apparatus according to claim 4, wherein: the root of the transmission shaft is provided with a transmission shaft boss, the bottom of the transmission shaft boss is connected with the center of the straight tenon, a sealing ring is embedded between the periphery of the transmission shaft boss and the inner wall of the water distributor barrel, the inner peripheral wall of the sealing ring is provided with an annular embedded groove, and an inner sealing element is embedded in the annular embedded groove to realize sealing with the transmission shaft boss; the outer peripheral wall of the sealing ring is provided with an annular outer embedded groove, and an outer sealing piece is embedded in the annular outer embedded groove to realize sealing with the inner wall of the water distributor barrel.

6. The intelligent layered water injection apparatus according to claim 5, wherein: a bearing base is mounted on the step of the boss of the transmission shaft, a bearing base core pipe extending upwards is arranged at the center of the bearing base, and the bearing base core pipe is sleeved on the periphery of the transmission shaft; a thrust bearing is arranged on the step of the bearing base, the top of the thrust bearing is propped against the lower part of the convex ring in the water distributor cylinder body, and a gap is reserved between the top of the thrust bearing and the bearing base core tube; and a pressure spring is arranged between the bottom of the fixed water nozzle and the upper port of the lower connector of the water distributor.

7. The intelligent layered water injection apparatus according to claim 6, wherein: the coupler is positioned above the convex ring in the water distributor cylinder, the bottom of the servo motor is provided with a water distributor control plate, and an output shaft of the servo motor penetrates through the center of the water distributor control plate; motor fixing threaded holes are symmetrically formed in the circumference of the upper portion of the water distributor barrel, servo motor fixing screws are respectively screwed in the motor fixing threaded holes, and inner end heads of the servo motor fixing screws are fixed on the servo motors.

8. The intelligent layered water injection apparatus according to claim 7, wherein: the water distributor control board is provided with a signal conditioning circuit, an MCU (microprogrammed control unit) main control chip and a motor control circuit, wherein the signal conditioning circuit comprises an AD7794 chip, and the MCU main control chip is a PIC18F46 chip; the inner pressure sensor is provided with signal output ends AIN1+ and AIN1-, and the outer pressure sensor is provided with signal output ends AIN2+ and AIN 2-; a signal output end AIN1+ is connected with the 7 th pin of the AD7794 chip, a signal output end AIN 1-is connected with the 8 th pin of the AD7794 chip, a signal output end AIN2+ is connected with the 9 th pin of the AD7794 chip, and a signal output end AIN 2-is connected with the 10 th pin of the AD7794 chip; and a pin 24 of the AD7794 chip is connected with a pin 8 of the MCU main control chip, and a pin 23 of the AD7794 chip is connected with a pin 9 of the MCU main control chip.

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