A micro downhole fluid station

Abstract

The present invention relates to a micro downhole liquid station, belonging to the technical field of downhole production equipment. It includes an uphole electrical control system, an intelligent composite continuous casing, a downhole electrical control system and a downhole micro liquid station; the uphole electrical control system is connected to the downhole electrical control system through the intelligent composite continuous casing, and the downhole electrical control system is connected to the downhole micro liquid station; the downhole electrical control system and the downhole micro liquid station are arranged in the same semi-cylindrical box. The present invention controls the downhole liquid station through the uphole electrical system to open the downhole safety valve, which greatly improves the control delay problem of the traditional safety valve, and has a more real-time and accurate monitoring of the working state of the downhole safety valve, which is of great help in eliminating the hidden safety hazards underground and avoiding well repair operations. The micro downhole liquid station is designed in the form of a semi-cylindrical shape surrounding the oil pipeline, which adapts to the narrow working space underground.

Description

Technical Field

[0001] The invention relates to a micro downhole liquid station, belonging to the technical field of downhole production equipment. Background Art

[0002] A downhole safety valve (SSSV) is a downhole tool installed in an oil and gas well that can be closed in an emergency to prevent blowouts and ensure the safety of oil and gas well facilities and production when abnormal conditions such as fire alarms, pipeline ruptures, and irresistible natural disasters (such as earthquakes, ice conditions, strong typhoons, etc.) occur in production facilities. The downhole safety valve can close the oil circuit in an emergency to prevent blowouts when abnormal conditions occur in the system. It is a key facility in oil production and completion tools. The traditional downhole safety valve is remotely controlled by the uphole hydraulic system to open and close the safety valve. The general principle of the traditional ground-controlled downhole safety valve is: add hydraulic pressure from the ground, high-pressure liquid enters the piston chamber through the control pipeline, pushes the piston downward, compresses the spring, and pushes the valve plate to open; maintain the ground control pressure, that is, keep it in the open state; release the ground control pressure, and the valve plate is reset under the action of the spring to close. The traditional downhole safety valve is remotely controlled by the uphole hydraulic system to open and close the safety valve. Due to the long transmission distance of the oil circuit, the control has a certain delay.

[0003] The intelligent composite continuous pipeline currently widely used in oil wells is an intelligent pipeline composed of a multi-layer composite substrate of non-metallic materials and communication lines, heating lines, and cables embedded inside. A single pipe is several thousand meters long (with no joints in the middle), which can greatly reduce the completion and mining operation time, improve oil production efficiency and benefits, and enhance the safety of the oil well system; combined with the development of corresponding supporting completion tools, it can realize the upgrading of the entire set of oil system equipment. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of traditional remote control of the opening and closing of the downhole safety valve through the uphole hydraulic system, in which the oil circuit is externally connected and bundled to the outside of the oil delivery pipe one by one, and each oil pipe needs to be bundled with a protective cover, resulting in low operating efficiency, high risk of damage from collisions, and high cost of well completion and repair. In addition, due to the long transmission distance of the oil circuit, long-distance hydraulic control has a certain delay and is inconvenient for maintenance.

[0005] In order to achieve the purpose of solving the above-mentioned problems, the technical solution adopted by the present invention is to provide a micro downhole liquid station, including an uphole electrical control system, an intelligent composite continuous casing, a downhole electrical control system and a downhole micro liquid station; the uphole electrical control system is connected to the downhole electrical control system through the intelligent composite continuous casing, and the downhole electrical control system is connected to the downhole micro liquid station; the downhole electrical control system and the downhole micro liquid station are arranged in the same semi-cylindrical box, and one end of the intelligent composite continuous casing is connected to one end of the box.

[0006] Preferably, the downhole electrical control system includes a power carrier machine 2, a remote data acquisition and transmission module and a relay; the power carrier machine 2 is provided with a power carrier module 2, the power carrier machine 2 is connected to one end of the relay through the remote data acquisition and transmission module, and the other end of the relay is connected to the downhole micro-liquid station.

[0007] Preferably, the downhole micro hydraulic station comprises an oil tank, a motor, a micro plunger pump, an overflow valve, a normally closed solenoid valve 1, a normally closed solenoid valve 2, a one-way valve, a pressure sensor, a filter and a single-acting hydraulic cylinder; the single-acting hydraulic cylinder is provided with an oil circuit inlet, and the oil tank is connected to the oil circuit inlet provided by the single-acting hydraulic cylinder through the normally closed solenoid valve 1; a micro plunger pump is provided between the oil tank and the normally closed solenoid valve 1, and the micro plunger pump is connected to the motor; a one-way valve is provided between the normally closed solenoid valve 1 and the oil circuit inlet of the single-acting hydraulic cylinder; the oil tank is connected to the oil circuit inlet provided by the single-acting hydraulic cylinder through the normally closed solenoid valve 2; an overflow valve is provided between the oil tank and the normally closed solenoid valve 1; the motor, the normally closed solenoid valve 1 and the normally closed solenoid valve 2 are connected to the relay; the oil circuit inlet provided by the single-acting hydraulic cylinder is provided with a pressure sensor, and the pressure sensor is connected to the downhole remote data acquisition and transmission module; a filter is provided between the oil tank and the micro plunger pump.

[0008] Preferably, the semi-cylindrical box equipped with a downhole electrical control system and a downhole micro liquid station includes a liquid station shell and a top cover; the top cover is configured as a hollow semi-cylindrical shell; the liquid station shell is provided with a rectangular body, and a semicircular sealing shell is provided at each end of the rectangular body; the liquid station shell and the top cover are sealed and connected to provide a hollow cavity.

[0009] Preferably, a mounting plate for installing electrical and hydraulic components required for the downhole micro liquid station is provided on the inner side of the liquid station shell; one end of the liquid station shell is connected to the intelligent composite continuous casing; a downhole micro liquid station is provided on the side of the liquid station shell away from the intelligent composite continuous casing; a downhole electrical control system is provided on the side of the liquid station shell close to the intelligent composite continuous casing.

[0010] Preferably, reinforcing ribs are provided on the inner side of the semi-cylindrical shell of the top cover for increasing the overall strength.

[0011] Preferably, the well electrical control system includes a computer, a programmable logic controller PLC and a power carrier machine 1; the power carrier machine 1 is provided with a power carrier module 1; the computer is connected to the power carrier module 1 through the programmable logic controller PLC.

[0012] Preferably, the intelligent composite continuous casing is provided with a composite substrate of a multilayer structure of non-metallic materials; and a power line is passed through the intelligent composite continuous casing.

[0013] Preferably, the power carrier module 1 provided in the above-hole electrical control system and the power carrier module 2 provided in the underground electrical control system are connected via a power line provided in the intelligent composite continuous casing.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The micro downhole fluid station provided by the present invention controls the downhole fluid station through the uphole electrical system, and then acts on other working parts through the downhole fluid station, which greatly improves the control delay problem of traditional downhole working parts.

[0016] 2. The micro downhole fluid station provided by the present invention controls the downhole fluid station through the uphole electrical system, and then opens the downhole safety valve through the downhole fluid station, which greatly improves the problem of control delay of traditional safety valves and has more real-time and accurate monitoring of the working status of the downhole safety valve, which is of great help in eliminating potential safety hazards in the well and avoiding well repair operations.

[0017] 3. The present invention designs the micro downhole liquid station into a semi-cylindrical shape that surrounds the oil pipeline, adapting to the narrow working space underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the overall control structure of a micro downhole fluid station of the present invention;

[0019] Figure 2 A schematic diagram of the overall structure of downhole components of a micro downhole fluid station of the present invention;

[0020] Figure 3 A schematic diagram of a liquid station housing and a top cover structure of a micro downhole liquid station of the present invention;

[0021] Figure 4 A schematic diagram of a hydraulic system of a micro downhole liquid station of the present invention;

[0022] Figure 5 A schematic diagram of the cross-sectional structure of an intelligent composite continuous casing of a micro downhole fluid station of the present invention;

[0023] Figure numerals: 1. safety valve; 2. downhole micro liquid station; 3. oil tank; 4. filter; 5. motor; 6. micro plunger pump; 7. overflow valve; 8. normally closed solenoid valve 1; 9. normally closed solenoid valve 2; 10. check valve; 11. single-acting hydraulic cylinder; 12 pressure sensor; 13. above-ground electrical control system; 14. downhole electrical control system; 15. intelligent composite continuous casing; 16. power line; 17. liquid station shell; 18. top cover; 19. reinforcing rib; 20. carrier module; 21. remote data acquisition and transmission module (I / O module); 22. relay; DETAILED DESCRIPTION

[0024] In order to make the present invention more clearly understood, a preferred embodiment is described in detail with reference to the accompanying drawings as follows:

[0025] like Figure 1-5As shown, the present invention provides a micro downhole liquid station, including an uphole electrical control system 13, an intelligent composite continuous casing 15, a downhole electrical control system 14 and a downhole micro liquid station 2; the uphole electrical control system 13 is connected to the downhole electrical control system 14 through the intelligent composite continuous casing 15, and the downhole electrical control system 14 is connected to the downhole micro liquid station 2; the downhole electrical control system 14 and the downhole micro liquid station 2 are arranged in the same semi-cylindrical box, and one end of the intelligent composite continuous casing 15 is connected to one end of the box. The downhole electrical control system 14 includes a power carrier machine 2, a remote data acquisition and transmission module 21 and a relay 22; the power carrier machine 2 is provided with a power carrier module 20, the power carrier machine 2 is connected to one end of the relay 22 through the remote data acquisition and transmission module 21, and the other end of the relay 22 is connected to the downhole micro liquid station 2. The underground micro-liquid station 2 includes an oil tank 3, a motor 5, a micro-plunger pump 6, an overflow valve 7, a normally closed solenoid valve 18, a normally closed solenoid valve 29, a one-way valve 10, a pressure sensor 12, a filter 4 and a single-acting hydraulic cylinder 11; the single-acting hydraulic cylinder 11 is provided with an oil circuit inlet, and the oil tank 3 is connected to the oil circuit inlet provided with the single-acting hydraulic cylinder 11 through the normally closed solenoid valve 18; a micro-plunger pump 6 is provided between the oil tank 3 and the normally closed solenoid valve 18, and the micro-plunger pump 6 is connected to the motor 5; the normally closed solenoid valve 18 is connected to the single-acting hydraulic cylinder 11. A one-way valve 10 is provided between the oil inlet of the hydraulic cylinder 11; the oil tank 3 is connected to the oil inlet of the single-acting hydraulic cylinder 11 through the normally closed solenoid valve 29; a relief valve 7 is provided between the oil tank 3 and the normally closed solenoid valve 18; the motor 5, the normally closed solenoid valve 18 and the normally closed solenoid valve 29 are connected to the relay 22; the oil inlet of the single-acting hydraulic cylinder 11 is provided with a pressure sensor 12, and the pressure sensor 12 is connected to the downhole remote data acquisition and transmission module 21; a filter 4 is provided between the oil tank 3 and the micro plunger pump 6. The semi-cylindrical box body provided with the downhole electrical control system 14 and the downhole micro liquid station 2 includes a liquid station shell 17 and a top cover 18; the top cover 18 is set as a hollow semi-cylindrical shell; the liquid station shell 17 is provided with a rectangular body, and semi-circular blocking shells are provided at both ends of the rectangular body; the liquid station shell 17 and the top cover 18 are sealed and connected to a hollow cavity. The inner side of the liquid station shell 17 is provided with a mounting plate for installing the electrical and hydraulic components required for the downhole micro liquid station 2; one end of the liquid station shell 17 is connected to the intelligent composite continuous casing 15; the downhole micro liquid station 2 is provided on the side of the liquid station shell 17 away from the intelligent composite continuous casing 15; the downhole electrical control system 14 is provided on the side of the liquid station shell 17 close to the intelligent composite continuous casing 15. The inner side of the semi-cylindrical shell of the top cover 18 is provided with a reinforcing rib 19 for increasing the overall strength. The uphole electrical control system 13 includes a computer, a programmable logic controller PLC and a power carrier machine 1; the power carrier machine 1 is provided with a power carrier module 1; the computer is connected to the power carrier module 1 through the programmable logic controller PLC.The intelligent composite continuous casing 15 is provided with a composite substrate of a multilayer structure of non-metallic materials; a power line 16 is passed through the intelligent composite continuous casing. The power carrier module 1 provided in the above-hole electrical control system 13 and the power carrier module 2 provided in the underground electrical control system 14 are connected through the power line 16 provided in the intelligent composite continuous casing 15.

[0026] Figure 1 It is a schematic diagram of the control system of the downhole liquid station 2. The above-ground and downhole signals are transmitted through the power carrier module 20. During active control, the host computer sends a signal to the PLC, and the PLC communicates with the carrier module 20 through the 485 bus to transmit the signal to the downhole. The downhole I / O module 21 communicates with the carrier module 20 through the 485 bus to complete the conversion from digital to analog, and transmits the signal to the sensor and relay 22 to realize the control of various components in the downhole. At the same time, the working status of each component is also fed back to the host computer in this way, which has a higher guarantee for the safety of downhole operations.

[0027] like Figure 1-3 As shown, the present invention designs a downhole safety valve opening system, including a downhole micro-fluid station 2 and an uphole control system 13. The uphole operator can control the downhole micro-fluid station 2 to operate the safety valve 1 to open and close through the upper computer. The signal transmission between the uphole and downhole is realized through the carrier module 20, and the electrical signal realizes the switch control of the downhole motor 5, the solenoid valve 8, and the sensor 12 through the relay 22. During operation, the pump 6 extracts the hydraulic oil in the oil tank 3 and pressurizes it to a certain degree to push the push rod of the safety valve 1, open the butterfly valve, and open the safety valve 1. The downhole fluid station 2 adopts a semi-circular ring column structure, which surrounds the upper pipeline of the downhole safety valve 1. Its interior adopts a layered structure to separate the oil tank 3, hydraulic components, electrical components, etc., which is convenient for the layout of components and pipelines. Figure 2-3It is a general schematic diagram of the structure of the underground liquid station. The underground liquid station adopts a semi-cylindrical structure to embrace the upper pipeline of the safety valve 1, and the two sides are fixed by clamps. The liquid station is 2.5m long and 210mm in diameter. The underground liquid station 2 is mainly composed of two parts, the upper part is equipped with electrical components (including carrier module 20, I / O module 21, UPS power supply, relay 22), and the lower part is mainly equipped with hydraulic components (including pressure reducing valve, overflow valve, electromagnetic reversing valve, proportional overflow valve, motor, micro plunger pump, filter, oil tank). In order to adapt to the narrow working space underground, the liquid station is designed in the form of a semi-cylinder embracing the oil pipeline, with a total length of 2.5m and a maximum radius of 210mm. Its main structure consists of a liquid station shell 17 and a top cover 18. Their contact surfaces are rectangular and connected by bolts. A rubber sealing ring is provided between the liquid station shell 17 and the top cover 18 to achieve isolation between the internal space of the liquid station and the underground environment. A reinforcing rib 19 is provided on the top cover 18 to increase the overall strength of the device. The component mounting plate can be placed on the liquid station housing 17 to install the electrical and hydraulic components required by the liquid station 2. The upper and lower ends of the liquid station are fixed to the pipeline on the upper side of the safety valve 1 by clamps.

[0028] Figure 4 This is the schematic diagram of the hydraulic system of the downhole fluid station. The entire hydraulic system consists of an oil tank 3, a filter 4, a motor 5, a micro plunger pump 6, a relief valve 7, a normally closed solenoid valve 1 8, a normally closed solenoid valve 2 9, a check valve 10, a single-acting hydraulic cylinder 11, and a pressure sensor 12. Opening the valve disc stage: the motor 5 drives the micro-plunger pump 6 to work, and the maximum output pressure is about 100Mpa. When the solenoid valve 8 changes direction to the right, the hydraulic oil flows into the right chamber of the hydraulic cylinder 11, pushing the piston rod to move until the valve disc opens; maintaining pressure and continuously opening stage: when the valve disc is opened, the pressure sensor 12 transmits the pressure value at this time to the ground, closes the solenoid valve 18, and the upper oil circuit maintains pressure through the one-way valve 10, so that the valve disc is continuously in an open state. When the pressure sensor 12 detects a pressure drop, the motor 5 and the micro-plunger pump 6 work, the solenoid valve 18 opens, and the pressure is replenished. When the pressure replenishes the opening pressure of the pressure sensor 12, the solenoid valve 18 is closed; closing the valve disc stage: close the solenoid valve 18, open the solenoid valve 29, unload the oil circuit, and close the valve disc; in the event of an emergency power outage, the solenoid valve 18 loses power and closes, and the solenoid valve 29 opens under the power supply of the backup power supply, unloads the oil circuit, and closes the valve disc.

[0029] Figure 5It is a structural schematic diagram of the intelligent composite continuous casing 15. The intelligent composite continuous casing 15 is an intelligent pipeline composed of a multi-layer composite substrate of non-metallic materials and embedded communication lines, heating lines, and cables; it is composed of a multi-layer structure such as an inner core tube, a pressure-resistant layer, a filling layer, a cable layer, a tensile layer, and an outer protective layer, and has the characteristics of corrosion resistance, light weight, anti-scaling, and anti-waxing; a single pipe is up to 3,000 meters long (without joints in the middle), which greatly reduces the time for completion and mining operations. Compared with traditional metal pipelines, the intelligent composite continuous casing 15 has a built-in cable layer, which is convenient for embedding signal and power lines 16 inside, providing a basis for the signal and energy transmission of the micro downhole liquid station proposed in the present invention.

[0030] A working method of a micro downhole fluid station system for opening a downhole safety valve comprises the following steps:

[0031] Step 1: The command to open the safety valve made by the well electrical control system is transmitted by the well computer through the programmable logic controller PLC and the power carrier machine 1, and the signal is transmitted to the underground power carrier machine 2 through the power line, and then transmitted to the motor through the remote data acquisition transmission module and the relay;

[0032] Step 2: The motor drives the miniature plunger pump to work, and the maximum output pressure is about 100Mpa. Once the normally closed solenoid valve is started, the hydraulic oil flows into the single-acting hydraulic cylinder, pushing the piston rod to move until the safety valve disc opens;

[0033] Step 3: When the safety valve flap opens, the pressure sensor transmits the pressure value back to the ground through the remote data acquisition and transmission module. The well sends a command to close the normally closed solenoid valve 1, and the oil circuit leading to the single-acting hydraulic cylinder is pressurized through the one-way valve to keep the valve flap in the open state;

[0034] Step 4: When the pressure sensor detects a pressure drop, the motor and the micro plunger pump work, and the normally closed solenoid valve opens to replenish the pressure; when the pressure reaches the opening pressure of the pressure sensor, the normally closed solenoid valve closes;

[0035] Step 5: The command to close the safety valve made by the uphole electrical control system is transmitted by the uphole computer through the programmable logic controller PLC and power carrier machine 1, and the signal is transmitted to the downhole power carrier machine 2 through the power line, and then transmitted to the normally closed solenoid valve 1 and the normally closed solenoid valve 2 through the remote data acquisition and transmission module and the relay. The normally closed solenoid valve 1 is closed, the normally closed solenoid valve 2 is opened, the oil circuit is unloaded, and the safety valve disc is closed; when a sudden power outage occurs, the normally closed solenoid valve 1 loses power and closes, while the normally closed solenoid valve 2 is opened under the power supply of the backup power supply, the oil circuit is unloaded, and the safety valve disc is closed.

[0036] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and equivalent changes made by using the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A micro downhole fluid station, characterized in that: It includes an uphole electrical control system, an intelligent composite continuous casing, a downhole electrical control system and a downhole micro-liquid station; the uphole electrical control system is connected to the downhole electrical control system through the intelligent composite continuous casing, and the downhole electrical control system is connected to the downhole micro-liquid station; the downhole electrical control system and the downhole micro-liquid station are arranged in the same semi-cylindrical box, and one end of the intelligent composite continuous casing is connected to one end of the box; The underground electrical control system includes a power carrier machine 2, a remote data acquisition and transmission module and a relay; the power carrier machine 2 is provided with a power carrier module 2, the power carrier machine 2 is connected to one end of the relay through the remote data acquisition and transmission module, and the other end of the relay is connected to the underground micro-liquid station; The downhole micro hydraulic station comprises an oil tank, a motor, a micro plunger pump, an overflow valve, a normally closed solenoid valve 1, a normally closed solenoid valve 2, a one-way valve, a pressure sensor, a filter and a single-acting hydraulic cylinder; the single-acting hydraulic cylinder is provided with an oil circuit inlet, and the oil tank is connected to the oil circuit inlet provided by the single-acting hydraulic cylinder through the normally closed solenoid valve 1; a micro plunger pump is provided between the oil tank and the normally closed solenoid valve 1, and the micro plunger pump is connected to the motor; a one-way valve is provided between the normally closed solenoid valve 1 and the oil circuit inlet of the single-acting hydraulic cylinder; the oil tank is connected to the oil circuit inlet provided by the single-acting hydraulic cylinder through the normally closed solenoid valve 2; an overflow valve is provided between the oil tank and the normally closed solenoid valve 1; the motor, the normally closed solenoid valve 1 and the normally closed solenoid valve 2 are connected to the relay; the oil circuit inlet provided by the single-acting hydraulic cylinder is provided with a pressure sensor, and the pressure sensor is connected to the remote data acquisition and transmission module; a filter is provided between the oil tank and the micro plunger pump.

2. A micro downhole fluid station as claimed in claim 1, characterized in that: A semi-cylindrical box equipped with an underground electrical control system and an underground micro liquid station includes a liquid station shell and a top cover; the top cover is set as a hollow semi-cylindrical shell; the liquid station shell is provided with a rectangular body, and semi-circular blocking shells are respectively provided at both ends of the rectangular body; the liquid station shell and the top cover are sealed and connected to provide a hollow cavity.

3. A micro downhole fluid station as claimed in claim 2, characterized in that: An installation plate for installing electrical and hydraulic components required for the downhole micro liquid station is provided on the inner side of the liquid station shell; one end of the liquid station shell is connected to the intelligent composite continuous casing; a downhole micro liquid station is provided on the side of the liquid station shell away from the intelligent composite continuous casing; a downhole electrical control system is provided on the side of the liquid station shell close to the intelligent composite continuous casing.

4. A micro downhole fluid station as claimed in claim 3, characterized in that: The inner side of the semi-cylindrical shell of the top cover is provided with reinforcing ribs for increasing the overall strength.

5. A micro downhole fluid station as claimed in claim 1, characterized in that: The well electrical control system includes a computer, a programmable logic controller PLC and a power carrier machine 1; the power carrier machine 1 is provided with a power carrier module 1; the computer is connected to the power carrier module 1 through the programmable logic controller PLC.

6. A micro downhole fluid station as claimed in claim 5, characterized in that: The intelligent composite continuous casing is provided with a composite base material of a multilayer structure of non-metallic materials; and a power line is passed through the intelligent composite continuous casing.

7. A micro downhole fluid station as claimed in claim 6, characterized in that: The power carrier module 1 provided in the above-hole electrical control system is connected with the power carrier module 2 provided in the underground electrical control system through a power line provided in the intelligent composite continuous casing.

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