Electric drive hydraulic control underground layered injection and production unit, system and layered injection and production control method

Abstract

The invention provides an electric drive hydraulic control underground layered injection and production unit and system and a layered injection and production control method. The electric drive hydraulic control underground layered injection and production unit comprises an electric drive hydraulic power module, an execution mechanism and a hydraulic control execution module. Wherein the electrically-driven hydraulic power module is configured to receive electric energy provided by the ground and convert the electric energy into hydraulic energy in situ underground so as to output hydraulic oil; the executing mechanism is used for adjusting the opening degree of the injection-production channel; the hydraulic control execution module is in fluid connection with the electric drive hydraulic power module and the execution mechanism and used for adjusting the flow direction of the hydraulic oil according to the control instruction and applying hydraulic energy to the execution mechanism to drive the execution mechanism to act.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of oil development, and particularly relates to an electric drive liquid control downhole separate layer injection and production unit, a system and a separate layer injection and production control method. BACKGROUND

[0002] After the oil development enters the middle and later period, the reservoir heterogeneity is enhanced, the interlayer contradiction is intensified, and single layer exploitation or general injection and production has been difficult to meet the fine development demand, and the separate layer injection and production technology becomes a key means to improve the oil and gas recovery.

[0003] The existing separate layer injection and production system is mainly divided into three types: the liquid control type relies on the ground liquid control pipeline for pressure supply, the pipeline is more and the structure is complex, and problems such as pressure attenuation and response lagging are prone to occur in the deep well high temperature and high pressure environment; the pure electric control type directly drives the actuator through the motor, although the pipeline is reduced, but the stability and service life are limited in the high load and continuous adjustment scene; the electro-hydraulic composite type still takes the ground pressure supply as the core, and only bears the control distribution function in the downhole, and it is difficult to realize the flexible establishment and fine adjustment of the downhole pressure. SUMMARY

[0004] The present disclosure provides an electric drive liquid control downhole separate layer injection and production unit, a system and a separate layer injection and production control method; and can solve the technical problems such as dependence on ground pressure supply, limited adjustment precision and insufficient operation stability of the existing separate layer injection and production system.

[0005] The technical solution of the present disclosure is implemented as follows: In a first aspect, the present disclosure provides an electric drive liquid control downhole separate layer injection and production unit, comprising: An electric drive hydraulic power module configured to receive electric energy provided from the ground and convert the electric energy into hydraulic energy in situ in the downhole to output hydraulic oil; An actuator for adjusting the opening degree of the injection and production channel; and A hydraulic control execution module fluidly connected with the electric drive hydraulic power module and the actuator, for adjusting the flow direction of the hydraulic oil according to the control instruction, and applying the hydraulic energy to the actuator to drive the actuator to act.

[0006] In a second aspect, the present disclosure provides an electric drive liquid control downhole separate layer injection and production system, comprising: A ground power supply for providing electric energy; A ground controller for issuing a control instruction containing target position data; At least one downhole separate layer injection and production unit as in the first aspect, the downhole separate layer injection and production unit being connected with the ground controller and the ground power supply through a power communication composite cable.

[0007] In a third aspect, the present disclosure provides a separate layer injection and production control method applied to the electric drive liquid control downhole separate layer injection and production system of the second aspect, comprising: The surface controller provides electric energy and control instructions to the downhole layered injection-production unit through the power communication composite cable. The electrically-driven hydraulic power module receives electric energy and converts the electric energy into hydraulic energy in situ downhole to establish an independent downhole hydraulic source in situ downhole. The hydraulic control execution module controls the flow direction of the hydraulic oil according to the control instructions, and applies the hydraulic energy generated by the downhole hydraulic source to the execution mechanism. The execution mechanism is driven by the hydraulic energy to adjust the opening degree of the injection-production channel.

[0008] The present disclosure provides an electrically-driven hydraulic control downhole layered injection-production unit, system and layered injection-production control method. The electrically-driven hydraulic control downhole layered injection-production unit, through the integrated electrically-driven hydraulic power module, hydraulic control execution module and execution mechanism, converts electric energy into hydraulic energy in situ downhole, breaks away from the dependence on surface pipeline pressure supply, simplifies the downhole structure and avoids problems such as pressure attenuation. The hydraulic control execution module precisely adjusts the flow direction of the hydraulic oil to drive the execution mechanism to realize fine adjustment of the opening degree of the injection-production channel. The integrated design and in-situ energy conversion mode make it adapt to complex downhole conditions, greatly improve the running stability, and the core injection-production adjustment function can be completed by relying on the unit alone. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 The structure schematic diagram of the electrically-driven hydraulic control downhole layered injection-production unit provided by the embodiment of the present disclosure is shown.

[0010] Figure 2 The composition structure schematic diagram of the electrically-driven hydraulic power module provided by the embodiment of the present disclosure is shown.

[0011] Figure 3 The composition structure schematic diagram of another electrically-driven hydraulic power module provided by the embodiment of the present disclosure is shown.

[0012] Figure 4 The overall structure schematic diagram of the hydraulic control execution module provided by the embodiment of the present disclosure is shown.

[0013] Figure 5 The detailed structure schematic diagram of the electromagnetic reversing valve group and the hydraulic locking assembly provided by the embodiment of the present disclosure is shown.

[0014] Figure 6 The different working state schematic diagram of the hydraulic control execution module provided by the embodiment of the present disclosure is shown.

[0015] Figure 7 The sensor arrangement schematic diagram of the downhole monitoring module provided by the embodiment of the present disclosure is shown.

[0016] Figure 8 The overall structure schematic diagram of the electrically-driven hydraulic control downhole layered injection-production system provided by the embodiment of the present disclosure is shown.

[0017] Figure 9 A control flow diagram of the electric drive liquid control downhole separate layer injection and production system is provided for the embodiments of the present disclosure.

[0018] Figure 10 A flow diagram of the separate layer injection and production control method is provided for the embodiments of the present disclosure. DETAILED DESCRIPTION

[0019] The technical solutions in the present disclosure will be described clearly and completely in combination with the drawings in the present disclosure.

[0020] With the development of oil exploitation into the middle and late stages, the heterogeneity of the oil reservoir gradually increases, and the differences in parameters such as permeability and oil saturation of different layers become more and more significant, and the interlayer contradiction is increasingly intensified. The traditional single layer exploitation or general injection and production method cannot accurately control different layers according to the geological characteristics and exploitation requirements, resulting in premature water flooding of some high-permeability layers and insufficient production of low-permeability layers, which seriously affects the oil and gas recovery rate and development effect. Therefore, the separate layer injection and production technology has become a key means to solve this problem, and the core is to independently adjust the fluid channels of different layers to realize separate layer injection and production, thereby optimizing the oil reservoir development dynamics and prolonging the production life of the oil well.

[0021] At present, the existing separate layer injection and production systems are mainly divided into liquid control type, pure electric control type and electro-hydraulic composite type. The liquid control separate layer injection and production system is an early application technology type, and its working principle is to deliver hydraulic pressure to the downhole through the ground liquid control pipeline, to push the sliding sleeve and other execution mechanisms to act by using the pressure signal, and then to realize separate layer control. This type of system technology is relatively mature, but it has obvious defects: in order to meet the control requirements of multiple layers, a large number of liquid control pipelines need to be laid, resulting in complex downhole structure; in deep wells, ultra-deep wells and extreme working conditions of high temperature and high pressure, the liquid control pipeline is prone to pressure attenuation, leakage and other problems, which not only leads to system response lag, but also greatly reduces the operation reliability and increases the maintenance cost.

[0022] The pure electric control separate layer injection and production system directly drives the execution mechanism by the motor, which eliminates the complex liquid control pipeline and simplifies the downhole structure. However, this type of system is limited by the downhole working conditions (such as narrow space and difficult heat dissipation) and the motor power, and in the high load scene (such as sliding sleeve jamming, opening degree adjustment under high pressure difference) and continuous operation requirement, the stability and service life of the motor face serious challenges, which is difficult to meet the requirements of fine injection and production for a long time.

[0023] The electro-hydraulic composite layered injection and production system attempts to combine the control flexibility of the electric control system and the driving capacity of the hydraulic control system, controls the action of the downhole valve group through the electric signal, and simultaneously relies on the ground hydraulic control system to provide hydraulic pressure to drive the actuator. However, the hydraulic power of such a system still mainly comes from the ground pressure supply, and the downhole system only bears the functions of control and pressure distribution, and cannot get rid of the dependence on the ground hydraulic control pipeline. In complex well conditions, the delay and instability of the ground pressure supply still exist, and the flexible establishment and fine adjustment of the downhole pressure cannot be realized, and it is difficult to fully exert the advantages of the layered injection and production technology.

[0024] In summary, the existing layered injection and production systems generally have high dependence on the ground pressure pipeline, insufficient downhole pressure regulation accuracy, poor actuator stability and other problems, which restricts their application effect in the later stage of oil development under complex well conditions. Therefore, developing a layered injection and production system that can realize downhole autonomous pressure building, reduce ground dependence, and improve control accuracy and operation stability has become a technical problem that needs to be solved in the current oil development technical field.

[0025] Based on this, the present disclosure first provides an electric drive hydraulic control downhole layered injection and production unit 100, referring to Figure 1 The electric drive hydraulic control downhole layered injection and production unit 100 can include an electric drive hydraulic power module 102, an actuator 104, and a hydraulic control execution module 106.

[0026] The electric drive hydraulic power module 102 is configured to receive electric energy provided from the ground and convert the electric energy into hydraulic energy in situ downhole to output hydraulic oil; the actuator 104 is used to adjust the opening degree of the injection and production channel; the hydraulic control execution module 106 is fluidly connected with the electric drive hydraulic power module 102 and the actuator 104, respectively, and is used to adjust the flow direction of the hydraulic oil according to the control instruction, and apply hydraulic energy to the actuator 104 to drive its action.

[0027] The electric drive hydraulic power module 102 is the energy core of the entire electric drive hydraulic control downhole layered injection and production unit 100, and is used to receive electric energy transmitted from the ground through the electric power communication composite cable, and complete energy conversion in situ downhole to directly convert electric energy into hydraulic energy, and finally output hydraulic oil meeting the requirements of injection and production operations. This in-situ energy conversion method downhole does not need to rely on the ground to deliver pressure through the hydraulic control pipeline, and fundamentally gets rid of the dependence on the ground pressure supply system, ensuring that the hydraulic power can be generated directly at the operation layer, meeting the power supply requirements under complex downhole conditions.

[0028] The actuator 104 is a direct execution component that realizes the adjustment of the injection-production channel. Its core function is to adjust the opening degree of the injection-production channel according to the hydraulic driving force. Directly linked with the key components such as the sliding sleeve of the injection-production channel, through its own extension or displacement movement, the opening, closing or precise adjustment of the injection-production channel at different opening degrees are realized, thereby controlling the fluid flow of the corresponding layer and adapting to the fine requirements of layered injection-production.

[0029] The hydraulic control execution module 106 plays a key role in power transmission and direction control. It is in communication with the electric drive hydraulic power module 102 and the actuator 104 through fluid pipelines, forming a complete hydraulic transmission circuit. The module can receive control instructions and accurately adjust the flow direction of hydraulic oil. The hydraulic energy output by the electric drive hydraulic power module 102 is distributed as needed and applied to specific parts of the actuator 104, thereby driving the actuator 104 to produce the expected action, ensuring the accuracy and timeliness of the injection-production channel opening degree adjustment. The three modules cooperate with each other to form an independent and complete downhole injection-production adjustment core, which can independently complete the whole process from energy conversion to execution adjustment without relying on additional hydraulic supply on the ground.

[0030] In some examples, with reference to Figure 2 The electric drive hydraulic power module 102 includes an oil storage cavity 1021, a downhole motor 1022, and a hydraulic pump 1023. The oil storage cavity 1021 is used to store circulating hydraulic oil. The downhole motor 1022 is electrically connected with the ground controller. The hydraulic pump 1023 is driven by the downhole motor 1022, and its oil inlet is connected with the oil storage cavity 1021, and its oil outlet is connected with the hydraulic control execution module 106.

[0031] The oil storage cavity 1021 is used to store circulating hydraulic oil and adopts a sealed structure design. The filter assembly inside the cavity can effectively filter impurities in the hydraulic oil, preventing impurities from entering the hydraulic pump 1023 or subsequent hydraulic circuit to cause component wear and blockage, and ensuring the long-term stable operation of the hydraulic system. The oil storage cavity 1021 is provided with a refueling port and an exhaust port. The refueling port is used to supplement hydraulic oil during installation or maintenance, and the exhaust port can exhaust air in the cavity to prevent air from mixing with the hydraulic oil and affecting the stability of pressure transmission, ensuring that sufficient circulating hydraulic oil can be continuously provided for the hydraulic pump 1023.

[0032] The downhole motor 1022 is the power output core of the module and is electrically connected with the ground controller, which can receive electric control signals from the ground and adjust the operating state according to the control requirements. The motor is in transmission connection with the hydraulic pump 1023 to provide power support for the operation of the hydraulic pump 1023. Its structure design is suitable for the complex environment of high temperature, high pressure, flammability and explosiveness in the well, ensuring stable power output in special downhole conditions to drive the hydraulic pump 1023 to work normally.

[0033] As a key component in the conversion of electrical energy to hydraulic energy, the hydraulic pump 1023 has its inlet connected to the oil storage chamber 1021 and its outlet connected to the hydraulic control execution module 106. Driven by the downhole motor 1022, the hydraulic pump 1023 pressurizes and outputs the hydraulic oil in the oil storage chamber 1021, realizing the autonomous establishment of downhole hydraulic pressure and completing the core conversion of electrical energy to hydraulic energy, providing high-pressure hydraulic power for the subsequent hydraulic control execution module 106 and actuator 104.

[0034] In some examples, refer to Figure 3 The electro-hydraulic power module 102 may also include a check valve 1024 and a relief valve 1025. The check valve 1024 is located in the output passage of the hydraulic pump 1023 to prevent hydraulic oil from flowing back into the hydraulic pump 1023. The relief valve 1025 is connected to the hydraulic circuit and is used to automatically open and release pressure when the system pressure exceeds a preset threshold to limit the maximum system pressure.

[0035] A one-way valve 1024 is installed in the output passage of the hydraulic pump 1023 to prevent hydraulic oil from flowing back into the hydraulic pump 1023. Its structural design ensures that when the hydraulic pump 1023 is working normally, the hydraulic oil flows smoothly to the hydraulic control execution module 106; when the hydraulic pump 1023 stops working or pressure fluctuations occur in the hydraulic circuit, the one-way valve 1024 closes quickly, blocking the reverse flow path of the hydraulic oil, preventing damage to the precision components inside the hydraulic pump 1023 due to reverse pressure impact, and ensuring the service life of the hydraulic pump 1023 and the stability of the system pressure.

[0036] The relief valve 1025 is connected to the hydraulic circuit and is used to automatically open and relieve pressure when the system pressure exceeds a preset value, thereby limiting the maximum system pressure. When the pressure exceeds the preset threshold due to abnormal conditions such as jamming of the actuator 104 or circuit blockage, the relief valve 1025 opens, allowing hydraulic oil to flow back to the oil reservoir 1021, achieving rapid pressure relief. When the pressure drops below the preset threshold, the relief valve 1025 closes, ensuring that the pressure is stable within a safe range and preventing damage to components such as the hydraulic pump 1023, pipelines, and valve groups due to excessive pressure, thus providing overpressure protection for the hydraulic system.

[0037] The components of the electro-hydraulic power module 102 work together to form a complete closed loop of power output and safety protection: the ground controller transmits electrical energy and control signals to the downhole motor 1022, and the downhole motor 1022 drives the hydraulic pump 1023 to run after starting; the hydraulic pump 1023 draws filtered hydraulic oil from the oil storage chamber 1021, and outputs hydraulic oil after pressurization. The hydraulic oil enters the hydraulic control execution module 106 through the check valve 1024, and the check valve 1024 simultaneously blocks the reverse return path; during the hydraulic oil output process, the relief valve 1025 monitors the system pressure in real time. When the pressure abnormally exceeds the limit, it quickly opens to relieve pressure and return the excess hydraulic oil to the oil storage chamber 1021, limiting the maximum system pressure; while the oil storage chamber 1021 continuously replenishes the hydraulic pump 1023 with clean hydraulic oil, completing the circulation supply of hydraulic oil. The entire process enables the autonomous conversion of in-situ electrical energy to hydraulic energy downhole, completely eliminating the dependence on surface hydraulic control pipelines for pressure supply. At the same time, the safety protection functions of check valve 1024 and overflow valve 1025 enhance the operational stability and reliability of the module under complex well conditions.

[0038] In some examples, refer to Figure 4 The hydraulic control execution module 106 is integrated within the downhole layered injection and production unit 100. It is connected to the oil outlet of the electro-hydraulic power module 102 and the chamber of the actuator 104 via fluid pipelines, forming a complete hydraulic transmission circuit. The hydraulic control execution module 106 includes an electromagnetic directional valve assembly 1061 and a hydraulic locking component 1062, with the hydraulic locking component 1062 positioned between the electromagnetic directional valve assembly 1061 and the actuator 104. This ensures precise delivery of hydraulic oil to the actuator 104 after regulation by the electromagnetic directional valve assembly 1061, and also allows the hydraulic locking component 1062 to respond to hydraulic pressure conditions in real time, promptly locking the position of the actuator 104 to prevent displacement of the actuator 104 during pressure fluctuations or shutdown. The housing of the hydraulic control execution module 106 adopts a temperature and pressure resistant structure adapted to downhole working conditions. The internal space is reserved for the independent installation of the electromagnetic reversing valve group 1061 and the hydraulic locking component 1062. The pipeline interface adopts a sealed design to prevent hydraulic oil leakage and ensure the long-term stable operation of the module in the downhole high temperature and high pressure environment.

[0039] In some examples, refer to Figure 5 The electromagnetic directional valve group 1061 is the core of hydraulic oil flow control. Its core components and working mode are completely consistent with the requirements. Specifically, it includes at least two two-position three-way solenoid valves 10611, which are connected to the first chamber and the second chamber of the actuator 104 respectively through a bridge control circuit to realize bidirectional drive control of the actuator 104.

[0040] Each two-position three-way solenoid valve 10611 consists of a valve body, a valve core, an electromagnet, and a return spring. The valve body is made of corrosion-resistant brass, the valve core is a stainless steel cylindrical structure, and the electromagnet is a DC-driven type that is electrically connected to the drive module of the downhole control unit and can receive electrical control signals to achieve on / off control. The inlet of the solenoid valve is connected to the main inlet of the hydraulic control execution module 106 through a connecting pipeline. The outlet and return port are connected to the inlet of the hydraulic locking component 1062 and the return passage of the oil storage chamber 1021 through a bridge control pipeline, forming a cross-type hydraulic circuit layout. That is, the outlet of the first two-position three-way solenoid valve 10611 is connected to the hydraulic passage of the first chamber of the actuator 104, and its return port is connected to the return passage of the second chamber of the actuator 104; the outlet of the second two-position three-way solenoid valve 10611 is connected to the hydraulic passage of the second chamber of the actuator 104, and its return port is connected to the return passage of the first chamber of the actuator 104, thus forming a complete bridge control circuit.

[0041] The working principle of the electromagnetic directional valve assembly 1061 is based on switching the valve core position by changing the on / off state of the electromagnet, thereby changing the flow direction of the hydraulic oil: When the downhole control unit sends an energizing signal to the first two-position three-way solenoid valve 10611, the electromagnet generates electromagnetic force to push the valve core to move, so that the oil inlet and outlet of the solenoid valve are connected and the return port is closed. The hydraulic oil flows through the passage of the solenoid valve to the first chamber of the actuator 104. At the same time, the second two-position three-way solenoid valve 10611 remains de-energized. Its valve core is in the initial position under the action of the return spring, the oil inlet is closed and the oil outlet and return port are connected. The hydraulic oil in the second chamber of the actuator 104 can flow back to the oil storage chamber 1021 through the return port of the solenoid valve, realizing the driving state of oil inlet in the first chamber and oil outlet in the second chamber. Conversely, when the control unit sends an energizing signal to the second two-position three-way solenoid valve 10611, hydraulic oil flows to the second chamber of the actuator 104, while the hydraulic oil in the first chamber flows back through the first solenoid valve, thus achieving reverse drive of the actuator 104. Through this bidirectional independent control logic, the solenoid directional valve group 1061 can precisely switch the on / off state of the hydraulic circuit, providing power direction control for the extension and retraction of the actuator 104.

[0042] In some examples, refer to Figure 5 The hydraulic locking assembly 1062 is a key component that ensures the stability of the position of the actuator 104. It adopts a two-way hydraulic control check valve group as its core structure, and its working mechanism strictly follows the essential limitations: when hydraulic oil is guided into a certain chamber of the actuator 104, the hydraulic pressure is used to open the hydraulic control check valve 10621 connected to another chamber, allowing the chamber to discharge oil and relieve pressure; when the hydraulic pressure stops outputting, the hydraulic oil backflow in the chamber of the actuator 104 is automatically cut off, thereby achieving position locking.

[0043] The bidirectional hydraulically controlled check valve assembly consists of two identical hydraulically controlled check valves 10621. Each hydraulically controlled check valve 10621 includes a main valve core, a pilot valve core, a return spring, and a seal. The main valve core adopts a conical structure and precisely fits with the valve body sealing surface to ensure a one-way sealing effect. The pilot valve core is located on the side of the main valve core and is connected to the oil inlet pipe of the other hydraulically controlled check valve 10621 through a pilot channel. The oil inlets of the two hydraulically controlled check valves 10621 are respectively connected to the oil outlets of the corresponding solenoid valves of the solenoid directional valve assembly 1061, and the oil outlets are respectively connected to the first chamber and the second chamber of the actuator 104. The pilot channels are cross-connected, that is, the pilot channel of the first hydraulically controlled check valve 10621 is connected to the oil inlet pipe of the second hydraulically controlled check valve 10621, and the pilot channel of the second hydraulically controlled check valve 10621 is connected to the oil inlet pipe of the first hydraulically controlled check valve 10621.

[0044] The working process of the hydraulic locking assembly 1062 is divided into two stages: driving pressure relief and locking position retention. In the driving pressure relief stage, when hydraulic oil enters the first chamber of the actuator 104 through the solenoid directional valve group 1061, the hydraulic oil first pushes the main valve core of the first hydraulic control check valve 10621 to open and smoothly enter the first chamber. At the same time, some hydraulic oil flows through the pilot channel to the pilot valve core of the second hydraulic control check valve 10621, generating pilot pressure, which pushes the main valve core of the second hydraulic control check valve 10621 to overcome the preload of the return spring and open. At this time, the hydraulic oil in the second chamber of the actuator 104 can flow back to the oil storage chamber 1021 through the open second hydraulic control check valve 10621 and the return oil passage of the solenoid directional valve group 1061, realizing the oil discharge and pressure relief of the second chamber and ensuring the smooth operation of the actuator 104. Similarly, when hydraulic oil enters the second chamber, the pilot valve core of the first hydraulic check valve 10621 is triggered to open, and the hydraulic oil in the first chamber flows back to relieve pressure.

[0045] During the locking and holding phase, when the solenoid directional valve group 1061 stops outputting hydraulic oil (the solenoid valve is de-energized and reset, and the oil inlet passage is closed), the pilot pressure of the hydraulic oil disappears, and the main valve cores of the two hydraulic control check valves 10621 are reset under the action of the reset spring, and are tightly fitted with the valve body sealing surface, cutting off the hydraulic oil return passage of the two chambers of the actuator 104, so that the hydraulic pressure in the chamber remains stable, thereby preventing the actuator 104 from being displaced under the action of external loads (such as downhole fluid pressure, vibration), and achieving stable holding of the position of the actuator 104.

[0046] The electromagnetic directional valve group 1061 of the hydraulic control execution module 106 and the hydraulic locking component 1062 form a collaborative working closed loop, fully covering the entire process of driving, regulating and holding the position of the actuator 104. Its working logic and technical advantages are as follows: During the drive and adjustment phase of actuator 104, the downhole control unit issues control commands according to the injection and production requirements. The corresponding solenoid valve of the solenoid directional valve group 1061 is energized, switching the on / off state of the hydraulic circuit. Hydraulic oil flows to the target chamber of actuator 104 via the bridge control circuit. Simultaneously, the corresponding hydraulically controlled check valve 10621 of the hydraulic locking component 1062 opens under the pilot pressure, allowing hydraulic oil in the other chamber to flow back and depressurize smoothly. Actuator 104 then extends and retracts under the hydraulic pressure difference, driving the sliding sleeve of the injection and production channel to adjust its opening. In this process, the bridge control circuit ensures precise and controllable hydraulic oil flow, and the bidirectional hydraulically controlled check valve group ensures smooth oil discharge and pressure relief, avoiding action jamming or pressure shock. The core of this directional drive principle is to create a pressure difference through valve group control, using hydraulic energy to drive mechanical action. Compared with pure electric control drive, it is more suitable for high-load downhole scenarios.

[0047] Reference Figure 6 The hydraulic control execution module 106 has a clearly different structure in different working states, specifically including a first working state and a second working state, wherein... Figure 6 In this context, A represents the first working state and B represents the second working state.

[0048] In the first working state, the two-position three-way solenoid valve 10611 in the solenoid directional valve group 1061, which is connected to the first side cavity of the actuator 104, is opened. The pressure oil output by the electro-hydraulic power module 102 enters the first side cavity of the actuator 104 through the hydraulic circuit, forming a pressure difference on both sides of the actuator 104, thereby driving the hydraulic sleeve to move along the first direction P1 to realize the opening or increase of the stratified injection and extraction channel. At the same time, under the pressure of the first side cavity, the hydraulic locking component 1062 pilots the opening of the one-way valve 1024 corresponding to the other side cavity of the actuator 104, so that the hydraulic oil in the other side cavity of the actuator 104 is discharged through the return oil channel.

[0049] In the second working state, the two-position three-way solenoid valve 10611 in the solenoid directional valve group 1061, which is connected to the second side cavity of the actuator 104, is opened. Pressure oil enters the second side cavity of the actuator 104 through the hydraulic circuit, causing the actuator 104 to move in the opposite direction under hydraulic action, thereby driving the hydraulic sleeve to move along the second direction P2 to achieve the closure or reduction of the opening of the stratified injection and extraction channel. At the same time, under the pressure of the second side cavity, the hydraulic locking component 1062 pre-opens the one-way valve 1024 corresponding to the first side cavity of the actuator 104, so that the hydraulic oil in the first side cavity of the actuator 104 is discharged through the return oil channel.

[0050] When the hydraulic sleeve moves to the target position, the downhole control unit closes the solenoid valve group, and the hydraulic locking component 1062 then takes effect. The hydraulic oil backflow is blocked by the hydraulic control check valve 10621, so that the hydraulic pressure in the actuator 104 cavity is maintained, thereby achieving the position holding of the hydraulic sleeve under the condition of no continuous drive.

[0051] In some examples, refer to Figure 7 The electro-hydraulic controlled downhole stratified injection and production unit 100 may also include a downhole monitoring module 108. The downhole monitoring module 108 includes at least a displacement sensor and a pressure sensor, and may also integrate a temperature sensor. Each sensor is deployed at key locations within the unit via a dedicated fixed structure to ensure the accuracy and real-time nature of data acquisition. The data acquisition unit is electrically connected to each sensor, responsible for signal processing and transmission, and ultimately achieves data interaction with the surface controller via a power-communication composite cable.

[0052] The displacement sensor is installed on the moving part of the actuator 104. Specifically, it can be installed on the piston rod of the hydraulic cylinder or the sliding sleeve transmission mechanism to move synchronously with the moving part to obtain real displacement data.

[0053] The pressure sensor is mainly used to monitor pressure changes in the hydraulic system. One end is installed at the outlet of the hydraulic pump 1023 in the electro-hydraulic power module 102 to collect the output pressure of the hydraulic pump 1023 in real time, reflecting the power output status. The other end can be deployed in the oil circuit or chamber near the actuator 104 as needed to collect the chamber pressure when the actuator 104 is in motion, helping to determine the load status of the actuator 104. Its core function is to collect system pressure data in real time. When the pressure data rises abnormally, it can indicate that the actuator 104 may have a fault such as jamming. When the pressure data is lower than the preset working pressure, it can report insufficient hydraulic power, providing data support for the ground controller to issue adjustment commands and avoid system damage or adjustment failure due to abnormal pressure.

[0054] A temperature sensor is installed inside the oil reservoir 1021, in direct contact with the hydraulic oil, to monitor the operating temperature of the hydraulic oil in real time and reflect the thermal state of the hydraulic system. The acquisition of temperature data helps determine if the system is at risk of overheating. When the temperature exceeds a preset threshold, the ground controller can issue a load reduction or suspension command to prevent the hydraulic oil from deteriorating due to high temperatures, ensuring the lubrication and sealing performance of the hydraulic system and extending the unit's service life.

[0055] On the one hand, real-time data acquisition allows the ground controller to accurately grasp the action status of the downhole actuator 104 and the operation of the hydraulic system, avoiding adjustment deviations caused by blind adjustment in traditional systems and improving the accuracy of injection-production channel opening adjustment. On the other hand, by monitoring parameters such as pressure and temperature, system failures can be warned in advance, reducing the risk of downhole equipment damage and lowering maintenance costs. At the same time, real-time data feedback allows the system to respond quickly to changes in operating conditions, enhancing the operational stability and reliability of the stratified injection-production unit 100 under complex well conditions, and providing strong data support for refined stratified injection-production.

[0056] Furthermore, this disclosure also provides an electro-hydraulic controlled downhole stratified injection and production system, referring to... Figure 8 The downhole stratified injection and production system may include a surface controller 801, a surface power supply 802, and at least one of the downhole stratified injection and production units 100. The downhole stratified injection and production unit 100 is connected to the surface controller 801 and the surface power supply 802 via a power communication composite cable 803.

[0057] The electro-hydraulic control downhole stratified injection and production system consists of a surface controller 801 and at least one downhole stratified injection and production unit 100. The downhole stratified injection and production unit 100 and the surface controller 801 are connected in a unique and stable manner through a power communication composite cable 803.

[0058] The surface controller 801, serving as the command center of the entire system, is deployed on the oil production platform or in the control room near the wellhead. It is connected to the surface power supply 802 via internal wiring to form a collaborative control unit. The surface power supply 802 is a high-voltage DC power supply, capable of converting industrial AC power into stable electrical energy suitable for downhole equipment. Its output power is precisely matched according to the number of downhole stratified injection and production units 100 and the power of each unit, ensuring a sufficient and stable power supply to multiple downhole units simultaneously. The surface controller 801 integrates functions such as command generation, signal processing, data reception and analysis. It has a built-in industrial-grade microprocessor and communication module, capable of generating targeted control commands according to reservoir development needs and distributing them to designated downhole stratified injection and production units 100 via a power-communication composite cable 803. Simultaneously, it receives real-time operational data from downhole, analyzes and judges it to form a dynamic adjustment strategy.

[0059] The downhole stratified injection-production unit 100 is deployed one-to-one with the reservoir layers and is arranged inside the production tubing. Each unit corresponds to an independent production layer, and strict interlayer isolation is achieved between units through packers 804 to prevent fluid cross-flow between different layers from interfering with the injection-production effect. Depending on the number of reservoir layers, one or more downhole stratified injection-production units 100 can be deployed.

[0060] For example, for an oil reservoir with three production layers, namely production layer 1, production layer 2 and production layer 3, three downhole layered injection and production units 100 will be deployed sequentially in the production tubing. Each downhole layered injection and production unit 100 is connected in series with the surface controller 801 through a power communication composite cable 803. The cable is laid along the inner wall of the production tubing and is fixed by a sealing joint when passing through the wellhead device, which ensures the safety protection of the cable and avoids downhole fluid leakage.

[0061] In some examples, refer to Figure 9 When the electro-hydraulic control downhole stratified injection and production system is working, step S902 is executed first to receive the surface control command. The surface controller 801 sends a dedicated control command to the control module of the designated downhole stratified injection and production unit 100 through the power communication composite cable 803 according to the reservoir stratified injection and production requirements. The downhole control module receives and parses the command to determine the opening adjustment target of the injection and production channel.

[0062] Then, step S904 is executed to initialize the system. After receiving the instruction, the downhole control module performs system initialization, relying on the downhole monitoring module 108 to complete the initial signal acquisition of the pressure sensor, displacement sensor, and temperature sensor; detect whether the power supply status is stable; and confirm the initial position of the actuator 104 to retain reference parameters for subsequent actions.

[0063] After initialization, step S906 is executed to start the electro-hydraulic pump and establish system pressure. Specifically, the downhole control module sends a start command to the electro-hydraulic power module 102, which drives the hydraulic pump 1023 in the module to operate, drawing in filtered hydraulic oil from the oil storage chamber 1021 and pressurizing it to begin establishing the working pressure of the hydraulic system.

[0064] Then, step S908 is executed to determine whether the pressure has reached the execution condition. If not, the process returns to step S906, and the hydraulic pump 1023 continues to operate to build pressure. If so, step S910 is executed to drive the solenoid valve to push the sliding sleeve to move. The downhole control module sends a drive signal to the solenoid directional valve group 1061 of the hydraulic control execution module 106 to control the solenoid valve to switch the on / off state of the hydraulic circuit, guide the hydraulic oil into the corresponding chamber of the actuator 104, and push the sliding sleeve to move in the set direction under the action of the pressure difference, and start the injection-production channel opening adjustment.

[0065] Then, step S912 is executed to monitor displacement, temperature, and pressure in real time. During the movement of the sliding sleeve, the downhole monitoring module 108 continuously collects three types of data: displacement data of the actuator 104 (reflecting the opening of the sliding sleeve), temperature data of the hydraulic oil (reflecting the thermal state of the system), and pressure data of the hydraulic system (reflecting the power supply status), and transmits them to the downhole control module in real time. Subsequently, step S914 is executed to determine whether the displacement has reached the target value. If not, the process returns to step S910; if yes, step S916 is executed to close the solenoid valve. After the downhole control module determines that the sliding sleeve has reached the target position, it sends a closing signal to the solenoid directional valve group 1061 to cut off the hydraulic oil supply passage; at the same time, it sends a stop command to the electro-hydraulic power module 102 to terminate the pressure building action of the hydraulic pump 1023.

[0066] Finally, steps S918 and S920 are executed. In step S918, the state is maintained and data is fed back.

[0067] Specifically, after the electromagnetic reversing valve group 1061 is closed, the hydraulic locking component 1062 (two-way hydraulic control check valve group) is activated, blocking the backflow of hydraulic oil in the chamber of the actuator 104, so that the sliding sleeve is stably maintained at the target opening; the downhole control module feeds back data such as the current sliding sleeve position, system pressure, and hydraulic oil temperature to the ground controller 801 via the power communication composite cable 803.

[0068] In step S920, continue to wait for commands.

[0069] Specifically, during the state maintenance phase, the downhole control module continuously monitors parameters and stands by: if a new command is received from the ground, the process restarts from step S902 to achieve dynamic adjustment; if no new command is received, the current state is maintained and operation continues.

[0070] Furthermore, this disclosure also provides a stratified injection-production control method, applied to the aforementioned electro-hydraulic controlled downhole stratified injection-production system, with reference to... Figure 10 Specifically, this may include steps S1010 to S1040.

[0071] In step S1010, the ground controller provides power and control commands to the downhole stratified injection and production unit via a power-communication composite cable.

[0072] In step S1020, the electro-hydraulic power module receives electrical energy and converts it into hydraulic energy in situ downhole to establish an independent downhole hydraulic source in situ downhole.

[0073] In step S1030, the hydraulic control execution module controls the flow direction of hydraulic oil according to the control command, and applies the hydraulic energy generated by the downhole hydraulic source to the actuator.

[0074] In step S1040, the actuator operates under hydraulic power to adjust the opening of the injection-production channel.

[0075] In some examples, the surface controller 801 provides corresponding control commands to multiple downhole stratified injection and production units 100 at different depths via a power-communication composite cable 803, based on the target location data. Each downhole stratified injection and production unit 100 responds to the received control commands and independently performs the conversion of electrical energy to hydraulic energy and the adjustment of the opening of the injection and production channel, thereby achieving independent adjustment and control of the injection and production status of multiple downhole depths. The specific process of the above steps can be referred to the description of the above-mentioned electro-hydraulic controlled downhole stratified injection and production system, and will not be repeated here.

[0076] Those skilled in the art will recognize that the functions described in this disclosure in one or more of the examples above can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0077] It should be noted that the technical solutions described in this disclosure can be combined arbitrarily as long as they do not conflict.

[0078] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An electro-driven hydraulically controlled downhole stratified injection and production unit, characterized in that, include: An electro-hydraulic power module is configured to receive electrical energy supplied from the surface and convert the electrical energy into hydraulic energy in situ downhole to output hydraulic oil; The actuator is used to adjust the opening of the injection / production channel; as well as The hydraulic control execution module is fluidly connected to the electro-hydraulic power module and the actuator, respectively, and is used to adjust the flow direction of the hydraulic oil according to the control command, and apply hydraulic energy to the actuator to drive its action; The electro-hydraulic power module includes: The oil reservoir is used to store circulating hydraulic oil; The downhole motor is electrically connected to the surface controller. The hydraulic pump is driven by the downhole motor, with its inlet connected to the oil storage chamber and its outlet connected to the hydraulic control execution module.

2. The electro-hydraulic controlled downhole stratified injection and production unit according to claim 1, characterized in that, The electro-hydraulic power module also includes: A check valve is installed in the output passage of the hydraulic pump to prevent the hydraulic oil from flowing back into the hydraulic pump; The relief valve, connected to the hydraulic circuit, is used to automatically open and release pressure when the pressure exceeds a preset threshold, thereby limiting the maximum pressure.

3. The electro-hydraulic controlled downhole stratified injection and production unit according to claim 1, characterized in that, The hydraulic control execution module includes: Electromagnetic directional valve assembly is used to switch the on / off state of the hydraulic circuit; A hydraulic locking assembly, disposed between the solenoid directional valve group and the actuator, is configured to automatically cut off the backflow of hydraulic oil in the actuator's chamber when the hydraulic pressure output stops.

4. The electro-hydraulic controlled downhole stratified injection and production unit according to claim 3, characterized in that, The electromagnetic reversing valve assembly includes: At least two two-position three-way solenoid valves are connected to the first chamber and the second chamber of the actuator respectively through a bridge control circuit to achieve bidirectional drive control of the actuator.

5. The electro-hydraulic controlled downhole stratified injection and production unit according to claim 4, characterized in that, The hydraulic locking assembly includes: The bidirectional hydraulic control check valve assembly, when hydraulic oil is guided into the first chamber, uses hydraulic pressure to first open the check valve connected to the second chamber, so as to allow the second chamber to discharge oil and achieve pressure relief.

6. The electro-hydraulic controlled downhole stratified injection and production unit according to claim 1, characterized in that, Also includes: The downhole monitoring module includes at least a displacement sensor and a pressure sensor, used to collect displacement feedback data and system pressure data of the actuator in real time, and upload the data to the ground controller.

7. An electro-driven hydraulically controlled downhole stratified injection and production system, characterized in that, include: Ground-based power sources are used to provide electrical energy; The ground controller is used to issue control commands containing target location data; At least one downhole stratified injection and production unit as described in any one of claims 1 to 6, wherein the downhole stratified injection and production unit is connected to the surface controller and the surface power supply via a power communication composite cable.

8. A stratified injection-production control method, characterized in that, The system applied to the electro-hydraulic controlled downhole stratified injection and production system as described in claim 7 includes: The ground controller provides power and control commands to the downhole stratified injection and production unit through the power-communication composite cable; The electro-hydraulic power module receives the electrical energy and converts it into hydraulic energy in situ downhole to establish an independent downhole hydraulic source in situ downhole. The hydraulic control execution module controls the flow of hydraulic oil according to the control command, and applies the hydraulic energy generated by the downhole hydraulic source to the execution mechanism; The actuator operates under the drive of the hydraulic energy to adjust the opening of the injection-production channel.

9. The stratified injection and production control method according to claim 8, characterized in that, The ground controller provides corresponding control commands to the downhole layered injection and production units corresponding to multiple layers through the power communication composite cable, based on the target location data. Each of the downhole stratified injection and production units responds to the received control command and independently executes the conversion of electrical energy to hydraulic energy and the opening adjustment of the injection and production channel, so as to realize the independent adjustment and control of the downhole multi-level injection and production status.

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