CN109869123B - Multi-layer separate injection system for water injection well - Google Patents
Multi-layer separate injection system for water injection well Download PDFInfo
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- CN109869123B CN109869123B CN201910202842.8A CN201910202842A CN109869123B CN 109869123 B CN109869123 B CN 109869123B CN 201910202842 A CN201910202842 A CN 201910202842A CN 109869123 B CN109869123 B CN 109869123B
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Abstract
The invention relates to a multi-layer separate injection system of a water injection well, which comprises a ground control system and an underground intelligent water distributor, wherein the ground control system comprises a water inlet main pipe, a water inlet branch pipe and a water injection pipe, a water inlet manual switch valve is arranged on the water inlet branch pipe through a flange, a front valve pressure transmitter is arranged on the upstream of the water inlet manual switch valve, an intelligent water regulating valve is arranged on the downstream of the water inlet manual switch valve through a flange, a flow sensor is arranged on the intelligent water regulating valve, the downstream of the intelligent water regulating valve is connected with the water injection manual switch valve, an outlet of the water injection manual switch valve is connected with the water injection pipe, a rear valve pressure transmitter is arranged on a pipeline between an outlet of the intelligent water regulating valve and an inlet of the water injection manual switch valve, and signal lines of the front valve pressure transmitter, the rear valve pressure transmitter and the intelligent water regulating valve are all connected with a ground controller. The water injection pipe is connected with a bypass drain pipe, and an electric pressure relief valve is arranged at the inlet of the bypass drain pipe. The control system can realize the bidirectional pressure wave communication between the surface equipment and the downhole instrument.
Description
Technical Field
The invention relates to a layered water injection well in the field of petroleum and natural gas, in particular to a multi-layer separate injection system of a water injection well, and belongs to the technical field of layered 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 oil well yield is greatly reduced, even the blowout and the production stop can be stopped, and at the moment, in order to make up the underground defect caused by crude oil exploitation, the oil layer pressure is maintained and improved, the high and stable oil field yield is realized, and the oil layer is required to be injected with water.
The separate layer water injection is implemented by the packing of the packer and the control of the water nozzle, so that the high, medium and low permeability stratum can play a role in water injection, and a technological measure for adjusting the contradiction between oil field layers and improving the water injection sweep coefficient is realized. In different oil field development stages, due to the different number and properties of the objective layers put into exploitation and the different objects and requirements of development adjustment, the aim of improving the development effect can be achieved by combining fine oil reservoir description and dynamic characteristic analysis and implementing separate-layer water injection.
The water distributor commonly used in the petroleum and natural gas field at present mainly comprises a traditional casting-fishing type water distributor, a water distributor capable of measuring and regulating simultaneously, a wheel injection water distributor and a cable-free water distributor, wherein the water injection quantity is measured and regulated by adopting a casting-fishing water nozzle or the water distributor is regulated simultaneously, and the cable-type intelligent water distributor needs to be subjected to cable-laying so as to carry out ground and underground communication. The intelligent water distributor without cable is more used, and the communication mode adopted by the ground device and the underground device is mainly as follows: the communication mode of the lowering communication nipple is gradually replaced by pressure wave communication due to the fact that the maintenance cost of the lowering communication nipple is high. The unidirectional pressure wave communication can only send wave code instructions to the underground by the ground, the underground intelligent water distributor receives the instructions to switch the water nozzle or change the injection allocation, but the unidirectional pressure wave communication can not obtain data such as real-time flow, formation pressure and the like of each layer of underground on the ground.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a multi-layer separate injection system of a water injection well, which can realize the two-way pressure wave communication between ground equipment and underground instruments.
In order to solve the technical problems, the multi-layer injection system of the water injection well comprises a ground control system and an underground intelligent water distributor controlled by the ground control system, wherein the ground control system comprises an incoming water main pipe and a water injection pipe, the incoming water main pipe is connected with an incoming water branch pipe, an incoming water manual switch valve is arranged on the incoming water branch pipe through a flange, a pressure transmitter in front of the incoming water manual switch valve is arranged on the upstream of the incoming water manual switch valve, an intelligent water regulating valve is arranged on the downstream of the incoming water manual switch valve through a flange, a flow sensor is arranged on the intelligent water regulating valve, the downstream of the intelligent water regulating valve is connected with a water injection manual switch valve through a flange, an outlet of the water injection manual switch valve is connected with the water injection pipe, a pressure transmitter behind the valve is arranged on a pipeline between an outlet of the intelligent water regulating valve and an inlet of the water injection manual switch valve, and signal wires of the pressure transmitter behind the valve and the intelligent water regulating valve are connected with a ground controller.
Compared with the prior art, the invention has the following beneficial effects: after the incoming water manual switch valve and the water injection manual switch valve are opened, water flows enter the intelligent water regulating valve along the incoming water main pipe and the incoming water branch pipe, and then enter the water injection pipe after being regulated by the intelligent water regulating valve, the pressure transmitter in front of the valve can detect the pressure at the upstream of the intelligent water regulating valve and transmit the pressure to the ground controller, the pressure transmitter in back of the valve can detect the pressure at the downstream of the intelligent water regulating valve and transmit the pressure to the ground controller, and the ground controller sends a control signal to regulate the switch of the intelligent water regulating valve, so that the water injection flow is controlled. When the intelligent water regulating valve is switched from full-closed to full-open, the ground pressure and the flow are increased simultaneously, so that the pressure and the flow are high in coding; when the intelligent water distribution valve is switched from full open to full closed, the ground pressure and the flow are reduced simultaneously, the pressure and flow code is low, so that a pressure wave is formed, and the downlink pressure wave is sent to the underground intelligent water distribution device, so that the water injection quantity is regulated and controlled. The underground intelligent water distributor forms pressure waves by switching the water nozzle or changing the opening degree of the water nozzle, the ascending pressure waves are collected by the pressure transmitter after the valve and are sent to the ground controller, and the ground controller analyzes the ascending pressure waves, so that the bidirectional pressure wave communication between the ground equipment and underground instruments is realized.
As an improvement of the intelligent water regulating valve, a power supply unit, a ground control chip, a data acquisition unit, a signal processing unit and a data remote transmission interface are arranged in the ground controller, a signal receiving end of the data acquisition unit is respectively connected with signal wires of the pressure transmitter before the valve, the pressure transmitter after the valve and the intelligent water regulating valve, a pressure flow signal output end of the data acquisition unit is connected with a pressure flow signal receiving end of the signal processing unit, the signal processing unit is in bidirectional communication connection with the ground control chip, the ground control chip is in bidirectional communication connection with the data remote transmission interface, the data remote transmission interface is in wireless connection with an upper computer, and a control signal output end of the signal processing unit is connected with a signal wire of the intelligent water regulating valve. The data acquisition unit receives a pre-valve pressure signal sent by the pre-valve pressure transmitter, a post-valve pressure signal sent by the post-valve pressure transmitter and a flow signal sent by the intelligent water regulating valve, and provides the signals for the ground control chip, and the ground control chip sends a control signal to the intelligent water regulating valve through the signal processing unit after operation and processing. The ground control chip also transmits real-time data such as flow, pressure and the like to the upper computer through the data remote transmission interface and the wireless equipment, and displays wellhead data in real time, so that the purpose of remote monitoring and adjustment is achieved. When the code is coded, a data remote transmission interface in the ground controller receives an instruction of an upper computer, and when the instruction is to read underground data, a control signal is sent to adjust the switch of the intelligent regulating valve, and the high and low changes of pressure and flow are formed through the switch of the intelligent regulating valve, so that the code sending function of pressure wave communication is realized. After receiving the ground signal, the underground intelligent water distributor returns the pressure wave code to the ground, and the ground analyzes the returned wave code. And when receiving the codes, reading pressure data of the pressure transmitter behind the valve and reading flow data on the intelligent regulating valve, wherein the pressure data is high pulse when the pressure data is higher than a certain threshold value, and the pressure data is low pulse when the pressure data is lower than a certain threshold value, so that the code receiving process of pressure wave communication is completed, the received wave codes are analyzed according to the agreed protocol content to obtain underground data, and the ground and underground two-way communication function is completed.
As a further development of the invention, the signal processing unit is also connected to the touch screen via a communication interface. The touch screen may be used for field display of data.
As a further improvement of the invention, the water injection pipe is connected with a bypass drain pipe, an inlet of the bypass drain pipe is provided with an electric pressure relief valve, the signal processing unit is provided with a 24V output end, and the 24V output end is connected with a power line of the electric pressure relief valve. When the underground water permeability is poor and the pressure cannot be reduced, the signal processing unit outputs 24V to the electric pressure release valve, so that the electric pressure release valve is opened to release pressure rapidly, and the coding of low pressure pulse is achieved.
As a further improvement of the invention, the pressure transmitter behind the valve is arranged on an outlet transverse pipe of the intelligent water regulating valve, a vertical support is arranged on the back surface of the ground controller, a clamp is fixed on the vertical support, and the clamp is embraced on an outlet vertical pipe of the intelligent water regulating valve. The ground controller can be installed on site through the vertical support and the clamp, and the position can be adjusted.
As a further improvement of the invention, the underground intelligent water distributor comprises an upper joint, an outer protective tube, a central overcurrent tube and a lower joint which are coaxial, wherein the periphery of the lower end of the upper joint is connected in the upper port of the outer protective tube in a rotating way, the periphery of the upper part of the lower joint is connected in the lower port of the outer protective tube in a rotating way, the lower port of the central overcurrent tube is pressed on the top of the lower joint, a water nozzle which is communicated with a central hole and has adjustable opening degree is arranged in the middle part of the lower joint, a water nozzle control mechanism is arranged in the lower joint, an inner protective tube is arranged between the upper part of the central overcurrent tube and the upper joint, the inner diameter of the inner protective tube is equal to the inner diameter of the central overcurrent tube, the upper end and the lower end of the inner protective tube are respectively provided with an inner protective tube convex ring which is outwards protruded, and an underground control unit is arranged in a cavity between the two inner protective tube convex rings; the lower end of the upper connector is pressed on the outer step of the upper inner protective tube convex ring, four convex ring grooves are uniformly distributed on the lower end surface of the lower inner protective tube convex ring, an upper sealing seat is respectively embedded in each convex ring groove, and the inner edge of each upper sealing seat is respectively pressed on the upper port of the central overcurrent tube; four mounting columns extending along the axial direction are uniformly arranged in an annular space between the central overflow pipe and the outer protective pipe, and the upper ends of the mounting columns are respectively fixed on the corresponding upper sealing seats. The upper joint is used for connecting the outer protective tube and the inner protective tube and providing a standard interface for connecting an oil tube column above; the outer protective tube has the functions of isolating the outer pressure and fluid of the oil tube, providing bearing force and the up-down pulling force of the oil tube for the instrument, and protecting the safety of the instrument; the central flow pipe is used for providing pressure and fluid in the oil pipe and providing a channel for lower-layer fluid and other logging instruments; the lower connector is connected with the outer protective tube and the central overcurrent tube, provides a fluid flow passage inlet and a fluid flow passage outlet for the water nozzle, is connected with the seal inspection and detection nipple joint, provides a pressure taking port for the seal inspection and detection nipple joint, and also provides a standard interface for connecting an oil tube column below. The underground control unit is arranged along the cavity between the inner protective tube and the outer protective tube, has compact structure, and accurately adjusts the opening degree of the water nozzle through the water nozzle control mechanism, thereby adjusting the water injection square quantity. When the water nozzle is switched from full closing to full opening, the water injection pressure and the flow rate are increased simultaneously, so that the pressure and the flow rate are high; when the water nozzle is switched from full open to full closed, the water injection pressure and the flow rate are reduced simultaneously, the pressure and flow rate coding is low, the underground pressure wave is formed, the underground pressure wave returns upwards and is collected by a pressure transmitter behind a valve of a ground control system and is sent to a ground controller, the ground controller analyzes the underground pressure wave, and the bidirectional pressure wave communication between ground equipment and underground instruments is realized.
As a further improvement of the invention, the lower ends of the first, second and third mounting columns are respectively fixed on the lower connector, the lower end of the first mounting column is provided with a seal inspection detection nipple capable of receiving pressure wave signals of a ground controller, the middle section of the second mounting column is provided with a motor driving mechanism for controlling the action time and direction of the water nozzle control mechanism, the motor driving mechanism is controlled by the underground control unit, and the signal input end of the underground control unit is electrically connected with the signal output end of the seal inspection detection nipple. The four mounting columns are used for respectively mounting the seal inspection detection pup joint and the motor driving mechanism on different phases of the annular space, so that the overall dimension of the water distributor can be reduced, and a central overcurrent tube with a larger inner diameter can be adopted, so that the passage of a test instrument is facilitated. The pressure sensor of the seal checking detection nipple receives a downlink pressure wave signal and transmits the pressure wave signal to the underground control unit, meanwhile, the seal checking detection nipple also measures the actual pressure in the pipe and the actual pressure outside the pipe, the condition of the packer is checked by combining a related algorithm, and the actual data of the pressure inside and outside the pipe are also fed back to the underground control unit. The underground control unit receives signals of the seal inspection detection nipple, stores algorithm data and control programs of each unit, and calculates flow data of the water nozzle; the motor driving mechanism is used for controlling the action time and direction of the water nozzle control mechanism, so that the opening value of the water nozzle water outlet is regulated, the water injection amount of the layer is regulated accurately, and meanwhile, the water nozzle water outlet is opened and closed to form underground pressure waves to be sent to a ground control system. The signal cable between the seal inspection detection nipple and the underground control unit passes along the inner cavity of the first mounting column, and the lower inner protection tube convex ring and the upper sealing seat are provided with axial holes for the signal cable to pass through. The water distributor can meet the function tests of seal inspection, water injection, pressure drop and the like for a long time after one-time construction.
As a further improvement of the invention, an integrated power supply unit for supplying power to the underground control unit, the motor driving mechanism and the seal inspection detection nipple is arranged on the fourth mounting column, a power supply unit outer protecting shell is arranged on the periphery of the integrated power supply unit, the outer edge of the upper sealing seat is pressed on the upper port of the power supply unit outer protecting shell, a lower sealing seat is arranged between the lower port of the power supply unit outer protecting shell and the outer wall of the central overcurrent tube, and the lower end of the fourth mounting column is fixed on the lower sealing seat. The integrated power supply unit provides power guarantee for each movement mechanism and electronic components, and the self-contained integrated power supply unit can enable the water distributor to work underground for a long time and perform ground and underground bidirectional transmission by utilizing pressure waves. The upper sealing seat and the lower sealing seat ensure the sealing of the upper port and the lower port of the outer protecting shell of the power supply unit.
As a further improvement of the invention, the inner diameter of the central through-flow tube is greater than 46mm. Can pass through a test instrument with an outer diameter smaller than 46mm.
As a further improvement of the invention, the outer port of the water nozzle is covered with an anti-spit cover. The anti-backflow cover does not affect water injection, and can prevent underground rock debris from entering the water nozzle.
Drawings
The invention will now be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration only and are not intended to limit the invention.
FIG. 1 is a perspective view of a ground control system in a multi-layer injection system for a water injection well according to the present invention.
Fig. 2 is a schematic diagram of the operation of the floor controller of fig. 1.
Fig. 3 is a front view of the intelligent water distributor in the well of the present invention.
Fig. 4 is a left side view of fig. 3 with the outer sheath removed.
In the figure: G1. a water supply pipe; G2. a water supply branch pipe; G3. a water injection pipe; G4. a bypass drain; p1. a pre-valve pressure transmitter; p2. a post-valve pressure transmitter; v1. water supply manual switch valve; v2, intelligent water regulating valve; v3. water injection manual switch valve; v4. electric pressure release valve; K1. a ground controller; k1a vertical support; k1b. Clamp.
1. An upper joint; 2. an outer protective tube; 3. a central overcurrent tube; 4. an inner protective tube; 4a, upper inner protective tube convex ring; 4b, a lower inner protective tube convex ring; 5. an upper seal seat; 6. a water nozzle control mechanism; 7. a motor driving mechanism; 8. seal inspection and detection pup joint; 9. a downhole control unit; 10. an integrated power supply unit; 10a, a power supply unit outer protective shell; 11. a first mounting post; 12. a second mounting post; 13. a third mounting post; 14. a fourth mounting post; 15. a lower seal seat; 16. a lower joint; 17. a water tap; 17a, a backflow prevention cover.
Detailed Description
As shown in fig. 1, the multi-layer separate injection system of the water injection well comprises a water inlet main pipe G1 and a water injection pipe G3, wherein the water inlet main pipe G1 is connected with a water inlet branch pipe G2, a water inlet manual switch valve V1 is arranged on the water inlet branch pipe G2 through a flange, a pre-valve pressure transmitter P1 is arranged on the upstream of the water inlet manual switch valve V1, an intelligent water regulating valve V2 is arranged on the downstream of the water inlet manual switch valve V1 through a flange, a flow sensor is arranged on the intelligent water regulating valve V2, a water injection manual switch valve V3 is connected on the downstream of the intelligent water regulating valve V2 through a flange, an outlet of the water injection manual switch valve V3 is connected with the water injection pipe G3, a post-valve pressure transmitter P2 is arranged on a pipeline between an outlet of the intelligent water regulating valve V2 and an inlet of the water injection manual switch valve V3, and signal lines of the pre-valve pressure transmitter P1, the post-valve pressure transmitter P2 and the intelligent water regulating valve V2 are all connected with a ground controller K1.
The pressure transmitter P2 behind the valve is arranged on an outlet transverse pipe of the intelligent water regulating valve V2, a vertical support K1a is arranged on the back surface of the ground controller K1, a clamp K1b is fixed on the vertical support K1a, and the clamp K1b is held on an outlet vertical pipe of the intelligent water regulating valve V2. The ground controller K1 can be installed on site through the vertical support K1a and the clamp K1b, and the position can be adjusted.
After the incoming water manual switch valve V1 and the water injection manual switch valve V3 are opened, water flows enter the intelligent water regulating valve V2 along the incoming water main pipe G1 and the incoming water branch pipe G2, the incoming water flows enter the water injection pipe G3 after being regulated by the intelligent water regulating valve V2, the pressure transmitter P1 before the valve can detect the pressure at the upstream of the intelligent water regulating valve V2 and transmit the pressure to the ground controller K1, the pressure transmitter P2 after the valve can detect the pressure at the downstream of the intelligent water regulating valve V2 and transmit the pressure to the ground controller K1, the ground controller K1 sends a control signal to regulate the switch of the intelligent regulating valve, the intelligent water regulating valve V2 has the function of detecting flow, can read the flow in real time and has the valve opening regulating function.
When the intelligent water regulating valve V2 is switched from full closed to full open, the ground pressure and the flow are increased simultaneously, so that the pressure and the flow are high in code; when the intelligent water regulating valve V2 is switched from full open to full closed, the ground pressure and flow are reduced simultaneously, the pressure and flow code is low, and thus a pressure wave is formed. And a command is sent to the underground intelligent water distributor in a pressure wave mode according to a preset protocol at regular time, so that the water injection quantity is regulated and controlled.
The underground intelligent water distributor forms pressure waves by switching the water nozzle or changing the opening degree of the water nozzle, the ascending pressure waves are collected by the pressure transmitter P2 behind the valve and are sent to the ground controller K1, and the ground controller K1 analyzes the ascending pressure waves, so that the bidirectional pressure wave communication between the ground equipment and underground instruments is realized.
As shown in fig. 2, a power supply unit, a ground control chip, a data acquisition unit, a signal processing unit and a data remote transmission interface are arranged in the ground controller K1, the signal receiving end of the data acquisition unit is respectively connected with signal wires of the pressure transmitter P1 before the valve, the pressure transmitter P2 after the valve and the intelligent water regulating valve V2, the pressure flow signal output end of the data acquisition unit is connected with the pressure flow signal receiving end of the signal processing unit, the signal processing unit is in bidirectional communication connection with the ground control chip, the ground control chip is in bidirectional communication connection with the data remote transmission interface, the data remote transmission interface is in wireless connection with an upper computer, and the control signal output end of the signal processing unit is connected with the signal wire of the intelligent water regulating valve V2.
The data acquisition unit receives a pre-valve pressure signal sent by the pre-valve pressure transmitter P1, a post-valve pressure signal sent by the post-valve pressure transmitter P2 and a flow signal sent by the intelligent water regulating valve V2, and provides the signals for a ground control chip, and the ground control chip sends a control signal to the intelligent water regulating valve V2 through the signal processing unit after operation and processing. The ground control chip also transmits real-time data such as flow, pressure and the like to the upper computer through the data remote transmission interface and the wireless equipment, and displays wellhead data in real time, so that the purpose of remote monitoring and adjustment is achieved.
When the code is coded, a data remote transmission interface in the ground controller K1 receives an instruction of an upper computer, and when the instruction is to read underground data, a control signal is sent to adjust the switch of the intelligent regulating valve, and the high and low changes of pressure and flow are formed through the switch of the intelligent regulating valve, so that the code sending function of pressure wave communication is realized.
After receiving the ground signal, the underground intelligent water distributor executes and returns the pressure wave code to the ground, and the ground analyzes the return wave code. During code receiving, the pressure data of the pressure transmitter P2 behind the valve and the flow data on the intelligent regulating valve are read, the pressure data is high pulse when the pressure data is higher than a certain threshold value, and the pressure data is low pulse when the pressure data is lower than a certain threshold value, so that the code receiving process of pressure wave communication is completed, the received wave code is analyzed according to the agreed protocol content to obtain underground data, and the ground and underground two-way communication function is completed.
The signal processing unit is also connected with the touch screen through a communication interface so as to display data on site.
The water injection pipe G3 is connected with a bypass drain pipe G4, an electric pressure relief valve V4 is arranged at the inlet of the bypass drain pipe G4, a 24V output end is arranged on the signal processing unit, and the 24V output end is connected with a power line of the electric pressure relief valve V4. When the underground water permeability is poor and the pressure cannot be reduced, the signal processing unit outputs 24V to the electric pressure relief valve V4, so that the electric pressure relief valve V4 is opened for quick pressure relief, and the coding of low pressure pulse is achieved.
As shown in fig. 3 and 4, the underground intelligent water distributor comprises an upper joint 1, an outer protective tube 2, a central overflow tube 3 and a lower joint 16 which are coaxial, wherein the periphery of the lower end of the upper joint 1 is screwed into the upper port of the outer protective tube 2, the periphery of the upper part of the lower joint 16 is screwed into the lower port of the outer protective tube 2, the lower port of the central overflow tube 3 is pressed on the top of the lower joint 16, a water nozzle 17 which is communicated with a central hole and has an adjustable opening degree is arranged in the middle part of the lower joint 16, and a water nozzle control mechanism 6 is arranged in the lower joint 16. The outer port of the water nozzle 17 is covered with a backflow preventing cap 17a, the backflow preventing cap 17a does not affect water injection, and downhole debris can be prevented from entering the water nozzle 17.
An inner protection pipe 4 is arranged between the upper part of the central overflow pipe 3 and the upper joint 1, the inner diameter of the inner protection pipe 4 is equal to the inner diameter of the central overflow pipe 3, the upper end and the lower end of the inner protection pipe 4 are respectively provided with an inner protection pipe convex ring protruding outwards, and an underground control unit is arranged in a cavity between the two inner protection pipe convex rings; the lower end of the upper joint 1 is pressed on the outer step of the upper inner protective tube convex ring 4a, four convex ring grooves are uniformly distributed on the lower end surface of the lower inner protective tube convex ring 4b, an upper sealing seat 5 is respectively embedded in each convex ring groove, and the inner edge of each upper sealing seat 5 is respectively pressed on the upper port of the central overflow pipe 3; four axially extending mounting columns are uniformly arranged in the annular space between the central overcurrent pipe 3 and the outer protective pipe 2, and the upper ends of the first mounting column 11, the second mounting column 12, the third mounting column 13 and the fourth mounting column 14 are respectively fixed on the corresponding upper sealing seat 5.
The lower ends of the first mounting column 11, the second mounting column 12 and the third mounting column 13 are respectively fixed on the lower joint 16, the lower end of the first mounting column 11 is provided with a seal inspection detection nipple 8 which can receive pressure wave signals of a ground controller, the middle section of the second mounting column 12 is provided with a motor driving mechanism 7 which controls the action time and direction of the water nozzle control mechanism 6, the motor driving mechanism 7 is controlled by an underground control unit 9, and the signal input end of the underground control unit 9 is electrically connected with the signal output end of the seal inspection detection nipple 8.
The fourth mounting column 14 is provided with an integrated power supply unit 10 for supplying power to the underground control unit 9, the motor driving mechanism 7 and the seal inspection detection nipple 8, the periphery of the integrated power supply unit 10 is provided with a power supply unit outer protecting shell 10a, the outer edge of the upper sealing seat 5 is pressed at the upper port of the power supply unit outer protecting shell 10a, a lower sealing seat 15 is arranged between the lower port of the power supply unit outer protecting shell 10a and the outer wall of the central overcurrent tube 3, and the lower end of the fourth mounting column is fixed on the lower sealing seat 15.
The upper joint 1 is used for connecting the outer protective tube 2 and the inner protective tube 4 and providing a standard interface for connecting an oil pipe column above; the outer protective tube 2 has the functions of isolating the external pressure and fluid of the oil tube, providing bearing force and the up-and-down pulling force of the oil tube for the instrument and protecting the safety of the instrument; the central flowtube 3 provides a passageway for pressure and fluid in the tubing and for lower layer fluids and other logging instruments.
The lower joint 16 is connected with the outer protection pipe 2 and the central overflow pipe 3, provides a fluid flow passage inlet and a fluid flow passage outlet for the water nozzle 17, is connected with the seal inspection and detection nipple 8, provides a pressure taking port for the seal inspection and detection nipple, and also provides a standard interface for connecting an oil pipe column below. The water nozzle control mechanism 6 precisely adjusts the opening degree of the water nozzle 17, thereby adjusting the water injection quantity.
The four mounting columns are used for respectively mounting the seal inspection detection pup joint 8, the motor driving mechanism 7 and the integrated power supply unit 10 on different phases of the annular space, so that the overall dimension of the water distributor can be reduced, and the central overflow pipe 3 with a larger inner diameter can be adopted, so that the passage of a test instrument is facilitated. The inner diameter of the central flow tube 3 is larger than 46mm, and can pass through a testing instrument with the outer diameter smaller than 46mm.
The pressure sensor of the seal inspection and detection nipple 8 receives a downlink pressure wave signal and transmits the downlink pressure wave signal to the underground control unit 9, meanwhile, the seal inspection and detection nipple 8 also measures the actual pressure in the pipe and the actual pressure outside the pipe, the condition of the packer is inspected and sealed by combining a related algorithm, and the actual data of the pressure inside and outside the pipe is also fed back to the underground control unit 9.
The underground control unit 9 receives signals of the seal inspection detection nipple 8, stores algorithm data and control programs of each unit, and calculates flow data of the water nozzle 17; the motor driving mechanism 7 is used for controlling the action time and direction of the water nozzle control mechanism 6, so that the opening value of the water nozzle water outlet is regulated, the water injection amount of the water layer is regulated accurately, and meanwhile, the water nozzle 17 is opened and closed to form an underground pressure waveform to be sent to a ground controller.
The signal cable between the seal inspection and detection nipple 8 and the underground control unit 9 can pass along the inner cavity of the first mounting column 11, and the lower inner protection tube convex ring 4b and the upper sealing seat 5 are provided with axial holes for the signal cable to pass through.
The integrated power supply unit 10 provides power guarantee for each movement mechanism and electronic components, and the self-contained integrated power supply unit 10 can enable the water distributor to work underground for a long time and perform surface and underground bidirectional transmission by utilizing pressure waves.
The seal checking process is as follows: firstly, each unit is in a dormant state in the well descending process, when the pressing seat seal is completed, a period of time is passed, a downhole circuit is in an awake state, a ground control system transmits pressure wave signals to a seal inspection detection nipple 8, the seal inspection detection nipple 8 feeds information back to a downhole control unit 9, the downhole control unit 9 controls a motor driving mechanism 7 and a water nozzle control mechanism 6 to switch a water nozzle 17 according to a stored logic unit of the downhole control unit, further, the pressure in a pipe is changed, the downhole pressure wave signals are transmitted back to the ground control system, and after the ground controller receives and passes through a corresponding algorithm, seal inspection data are obtained.
The water injection process is as follows: when water is injected according to the required quantity, the ground control system transmits water injection data to the underground seal inspection detection nipple 8 through pressure waves, after the seal inspection detection nipple 8 receives and feeds back to the underground control unit 9, the underground control unit 9 controls the motor control mechanism and the water nozzle control mechanism 6 to open the water nozzle 17 to the corresponding positions through the related algorithm by utilizing the logic unit of the related algorithm, and the water nozzle 17 is closed after water injection is completed.
The underground intelligent water distributor can meet the function tests of seal inspection, water injection, pressure drop and the like for a long time by one-time construction, and the communication between the underground intelligent water distributor and the ground is realized by controlling the water injection to generate pressure waves of high and low pulses. The problems that the pressure change is not obvious when the water absorption of the stratum is poor and the pressure is not easy to detect can be well solved, and the practicability is strong. The water distributor can achieve the purpose of intelligent separate layer water injection after one-time well descending construction operation, the construction efficiency is improved, operators are reduced, and the cost is reduced.
The foregoing description is only of a preferred embodiment of the invention and is not intended to limit the scope of the invention. In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention. The technical features of the present invention that are not described may be implemented by or using the prior art, and are not described herein.
Claims (8)
1. The utility model provides a water injection well multilayer divides annotate system, includes ground control system and is controlled by ground control system's intelligent water injection mandrel in pit, its characterized in that: the ground control system comprises an incoming water main pipe and a water injection pipe, the incoming water main pipe is connected with an incoming water branch pipe, an incoming water manual switch valve is arranged on the incoming water branch pipe through a flange, a front valve pressure transmitter is arranged on the upstream of the incoming water manual switch valve, an intelligent water regulating valve is arranged on the downstream of the incoming water manual switch valve through a flange, a flow sensor is arranged on the intelligent water regulating valve, a water injection manual switch valve is connected on the downstream of the intelligent water regulating valve through a flange, an outlet of the water injection manual switch valve is connected with the water injection pipe, a rear valve pressure transmitter is arranged on a pipeline between an outlet of the intelligent water regulating valve and an inlet of the water injection manual switch valve, and signal lines of the front valve pressure transmitter, the rear valve pressure transmitter and the intelligent water regulating valve are all connected with a ground controller of the ground control system;
the underground intelligent water distributor comprises an upper joint, an outer protective tube, a central flow-through tube and a lower joint which are coaxial, wherein the periphery of the lower end of the upper joint is connected in the upper port of the outer protective tube in a screwed mode, the periphery of the upper part of the lower joint is connected in the lower port of the outer protective tube in a screwed mode, the lower port of the central flow-through tube is pressed on the top of the lower joint, a water nozzle which is communicated with a central hole and adjustable in opening degree is arranged in the middle of the lower joint, a water nozzle control mechanism is arranged in the lower joint, an inner protective tube is arranged between the upper part of the central flow-through tube and the upper joint, the inner diameter of the inner protective tube is equal to the inner diameter of the central flow-through tube, the upper end and the lower end of the inner protective tube are respectively provided with an inner protective tube protruding ring which protrudes outwards, and an underground control unit is arranged in a cavity between the two inner protective tube protruding rings; the lower end of the upper connector is pressed on the outer step of the upper inner protective tube convex ring, four convex ring grooves are uniformly distributed on the lower end surface of the lower inner protective tube convex ring, an upper sealing seat is respectively embedded in each convex ring groove, and the inner edge of each upper sealing seat is respectively pressed on the upper port of the central overcurrent tube; four mounting columns extending along the axial direction are uniformly arranged in an annular space between the central overflow pipe and the outer protective pipe, and the upper ends of the mounting columns are respectively fixed on the corresponding upper sealing seats;
the lower ends of the first, second and third mounting columns are respectively fixed on the lower joint, the lower end of the first mounting column is provided with a seal inspection detection nipple capable of receiving pressure wave signals of a ground controller, and a signal cable between the seal inspection detection nipple and the underground control unit passes along the inner cavity of the first mounting column; the middle section of the second mounting column is provided with a motor driving mechanism for controlling the action time and direction of the water nozzle control mechanism, the motor driving mechanism is controlled by the underground control unit, and the signal input end of the underground control unit is electrically connected with the signal output end of the seal inspection and detection nipple.
2. The multi-layer dispensing system of a water injection well of claim 1, wherein: the ground controller is internally provided with a power supply unit, a ground control chip, a data acquisition unit, a signal processing unit and a data remote transmission interface, wherein a signal receiving end of the data acquisition unit is respectively connected with signal wires of the pressure transmitter before the valve, the pressure transmitter after the valve and the intelligent water regulating valve, a pressure flow signal output end of the data acquisition unit is connected with a pressure flow signal receiving end of the signal processing unit, the signal processing unit is in bidirectional communication connection with the ground control chip, the ground control chip is in bidirectional communication connection with the data remote transmission interface, the data remote transmission interface is in wireless connection with an upper computer, and a control signal output end of the signal processing unit is connected with a signal wire of the intelligent water regulating valve.
3. The water injection well multi-layer dispensing system of claim 2, wherein: the signal processing unit is also connected with the touch screen through a communication interface.
4. The water injection well multi-layer dispensing system of claim 2, wherein: the water injection pipe is connected with a bypass drain pipe, an electric pressure relief valve is arranged at an inlet of the bypass drain pipe, a 24V output end is arranged on the signal processing unit, and the 24V output end is connected with a power line of the electric pressure relief valve.
5. The multi-layer dispensing system of a water injection well of claim 1, wherein: the pressure transmitter behind the valve is installed on the outlet cross pipe of the intelligent water regulating valve, a vertical support is installed on the back of the ground controller, a clamp is fixed on the vertical support, and the clamp is held on an outlet vertical pipe of the intelligent water regulating valve.
6. The multi-layer dispensing system of a water injection well of claim 1, wherein: the integrated power supply unit for providing power for the underground control unit, the motor driving mechanism and the seal inspection detection nipple is arranged on the fourth mounting column, a power supply unit outer protecting shell is arranged on the periphery of the integrated power supply unit, the outer edge of the upper sealing seat is pressed on the upper port of the power supply unit outer protecting shell, a lower sealing seat is arranged between the lower port of the power supply unit outer protecting shell and the outer wall of the central overcurrent tube, and the lower end of the fourth mounting column is fixed on the lower sealing seat.
7. The multi-layer dispensing system of a water injection well of claim 1, wherein: the inner diameter of the central through-flow tube is larger than 46mm.
8. The multi-layer dispensing system of a water injection well of claim 1, wherein: the outer port of the water nozzle is covered with an anti-return cover.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110593828B (en) * | 2019-06-24 | 2023-12-22 | 中国石油天然气股份有限公司 | Fluid pressure wave code experimental device and method |
| CN113374456B (en) * | 2021-07-07 | 2022-05-03 | 中国石油化工股份有限公司 | Pressure wave two-way communication layered water injection device |
| CN115387764B (en) * | 2022-09-13 | 2024-01-05 | 西安洛科电子科技股份有限公司 | Manual-automatic adjusting separate injection instrument and water injection method |
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