Method for preparing and outputting target liquid of multi-well digital pressurized injection skid-mounted equipment

Abstract

The invention relates to a target liquid preparation and output method for multi-well digital pressurized injection skid-mounted equipment, which comprises the following steps: a continuous mixing pressurized liquid feeding pry decompresses injected production water, disperses and grinds a polymer, and enters an online continuous curing pry; flow guide channels are formed among the chambers of the on-line continuous curing pry, so that the polymer solution flows according to a preset route, and the curing time of the polymer solution is ensured; the production water and the cured polymer solution are pressurized by a pressurizing liquid feeding module and then conveyed to a static mixer, and a surfactant injection pry conveys a surfactant to the static mixer according to the set concentration to be mixed with the polymer solution; pressurizing the solution mixed by the static mixer through a pressurizing injection pry, and injecting the pressurized solution into each target well to complete preparation and output of the target solution; and the operation state and operation parameters of the equipment are collected and uploaded to the digital control module, so that remote control and comprehensive monitoring of the system are realized.

Description

Technical field:

[0001] The invention relates to a method for preparing and outputting target liquid of multi-well digital pressurized injection skid-mounted equipment. Background technology:

[0002] Skid-mounted equipment refers to a combination of the equipment frame and the entire equipment, consisting of multiple different types of functional modules, which can complete the configuration and output of the target fluid. Under normal circumstances, each functional module in the skid-mounted equipment is individually controlled and adjusted by the staff, and the configuration and output of the target fluid in the target well are completed through the mutual configuration of each functional module.

[0003] Currently, the process of configuring target fluids for multiple target wells mainly relies on the staff's work experience to operate different types of skid-mounted equipment. The skid-mounted equipment are all independently set up and are not equipped with corresponding integrated digital control devices. As a result, the entire configuration output process cannot be automatically adjusted and controlled. There is a lack of corresponding linkage and coordination between the various functional modules and the skid-mounted equipment, which makes it impossible to guarantee the overall work efficiency and work accuracy of the skid-mounted equipment, and cannot meet the actual use needs of the configuration and output of target fluids for multiple target wells. Summary of the invention:

[0004] An embodiment of the present invention provides a method for preparing and outputting target liquids for a multi-well digital booster injection skid-mounted equipment. The method is rationally designed and is based on the mutual linkage and coordination of multiple functional modules. It adopts a "low-pressure mixing, multi-pump to multi-well" approach to configure and output the target liquid according to the specific number and actual needs of multiple target wells. The overall process can be unmanned except for the manual feeding process. Through digital automation control, the overall working efficiency and working accuracy of the skid-mounted equipment are improved, and the stability of the viscosity of the configured target liquid is improved. The overall operation process is in an automatic control state. Each skid-mounted equipment adopts an integrated unified control mode. The work process is smooth and safe. In the event of an abnormal situation, an early warning can be given in time, which can better meet the actual automation control application needs. It can be applicable to a variety of different types of injection skid-mounted equipment and application scenarios, which is convenient for promotion and popularization, and solves the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A method for preparing and outputting target liquid using a multi-well digital boost injection skid-mounted device, the method comprising the following steps:

[0007] S1, the continuous mixing and pressurizing liquid feeding skid depressurizes the injected production water, disperses and grinds the polymer and feeds it into the online continuous maturation skid;

[0008] The continuous mixing and pressurizing liquid feeding skid includes a flow distribution module, which is used to achieve decompression and flow distribution of production water, and to distribute and adjust the water volume on demand for polymer mixing; a polymer adding, dispersing and dissolving module, which is used to store and transport dry powder materials to achieve rapid homogeneous mixing of polymers according to a set concentration; a pressurized liquid feeding module, which is used to pressurize the polymer solution in the aging tank through a liquid feeding pump and then transport it to a static mixer for mixing with a surfactant, and adopts PID control to achieve constant pressure liquid feeding by variable frequency control of the liquid feeding pump; a multiphase mixing module, which is used to complete the full mixing of the three media of polymer mother liquor, production water and surfactant by controlling the addition ratio of production water, surfactant and polymer mother liquor, and adjust the final injection concentration to obtain polymer solutions of different concentrations to meet the needs of different numbers of injection wells and different injection processes, and can also be adjusted in real time according to the feedback from the injection wells;

[0009] S2, a flow channel is formed between each chamber of the online continuous aging skid to allow the polymer solution to flow along a predetermined route, ensuring the aging time of the polymer solution. Multi-stage stirring is configured to accelerate the aging of the polymer, thereby completing the continuous stirring and online aging of the polymer and the produced water.

[0010] S3. Install a corresponding number of static mixers based on the number of target wells. Also, set up a corresponding number of production water transmission pathways and polymer solution transmission pathways between the continuous mixing and pressurized liquid feeding skid and the static mixers, and between the online continuous maturation skid and the static mixers. This allows the production water and the matured polymer solution to be pressurized and delivered to the static mixers via the pressurized liquid feeding module. The surfactant injection skid delivers the surfactant at a set concentration to the static mixer for mixing with the polymer solution.

[0011] S4: Multiple media are fully mixed through the multiphase mixing module, and the solution mixed in the static mixer is pressurized by the booster injection skid and injected into each target well to complete the configuration and output of the target solution.

[0012] S5 collects the equipment operating status and operating parameters and uploads them to the digital control module to achieve remote control and comprehensive monitoring of the system, and can perform parameter setting, one-button start and stop, fault alarm, real-time curve generation and historical data query.

[0013] A high-pressure electric ball valve is installed at the water inlet of the main line of the flow distribution module. The high-pressure electric ball valve is used to realize manual or automatic opening and closing, and cooperates with the pressure reducing valve installed at the rear end of the electric valve to meet the water supply requirements of high-speed mixing and grinding of polymers and dilution of polymer mother liquor;

[0014] A pressure transmitter is provided at the rear end of the pressure reducing valve, which is used to detect the output pressure and is interlocked with the high-pressure electric ball valve at the front end of the pressure reducing valve;

[0015] A flow regulating component is also provided at the rear end of the pressure reducing valve. The flow regulating component is set according to the well group data and adapted to the production water transmission path to realize automatic adjustment of the production water flow. The flow regulating component is an intelligent flow measuring and controlling instrument, which is equipped with a ball valve and a check valve.

[0016] The polymer in the dry powder tank of the polymer dosing, dispersing and dissolving module is quantitatively delivered to the high-speed mixing funnel according to the set concentration requirement. The corresponding instantaneous liquid flow rate and dry powder delivery rate can be automatically adjusted so that the production water forms a high-speed water flow in the high-speed mixing funnel through the injection component. After the polymer is initially mixed by the high-speed water flow, it enters the homogenizing component, which is a grinding pump. Under the action of the homogenizing component, the polymer is fully dissolved to obtain a polymer solution.

[0017] The polymer dosing, dispersing and dissolving module includes an intelligent flow measurement and control instrument, a screw feeding conveyor, a check valve, a weighing component and a homogenizing component.

[0018] The polymer dosing, dispersing and dissolving module can automatically adjust the incoming water flow to maintain and stabilize it at the set value. At the same time, it automatically calculates the polymer demand according to the set polymer concentration, and automatically adjusts the discharge amount of the screw feeder to maintain a certain ratio with the produced water, so that the polymer can be evenly transported to the high-speed mixing funnel to mix with the produced water, maintaining a constant polymer concentration.

[0019] The amount of polymer added and the flow of produced water can be automatically matched and controlled by a PLC program, and the polymer concentration deviation can be eliminated by regular cumulative measurement of the weighing component;

[0020] The model of the intelligent flow measurement and control instrument is GLZ-I I I50Z1.6, and the model of the weighing component is HT-CWC-4T.

[0021] In the pressurized liquid feeding module, the liquid feeding pump model is D2H375N. The outlet pressure of the liquid feeding pump can be detected by a pressure transmitter, and the displacement can be adjusted by frequency conversion to maintain a constant pressure at the outlet of the liquid feeding pump, ensuring stable liquid suction by the high-pressure injection pump. Low-shear sampling ports are set at the front and rear ends of the liquid feeding pump respectively. The rear end of the liquid feeding pump is connected to a safety valve, pressure transmitter, electromagnetic flowmeter, sampling valve and check valve.

[0022] Left-handed mixing units and right-handed mixing units are arranged in sections in the pipeline of the multiphase mixing module, so that the liquid continuously changes its flow direction between the left-handed mixing units and the right-handed mixing units, not only pushing the central liquid to the periphery, but also pushing the peripheral fluid to the center, producing a good radial mixing effect.

[0023] The aging tank of the online continuous aging skid adopts a multi-stage continuous aging mode; a multi-stage stirring assembly is installed in the aging tank. The multi-stage stirring assembly adopts fixed frequency control or variable frequency control to accelerate the aging of the polymer and shorten the aging time. The stirring speed is adjusted by variable frequency to ensure that the equipment can complete the aging of the polymer while reducing the shear effect of stirring on the polymer solution;

[0024] A connecting flow channel is formed between each chamber in the aging tank, so that the polymer solution flows along a predetermined route, ensuring that the polymer is fully matured within the process design time;

[0025] A diaphragm-type electronic liquid level gauge is installed in the maturation tank, and high and low liquid level protection can be set to ensure that the liquid level in the maturation tank is within an appropriate range. The diaphragm-type electronic liquid level gauge is installed in the first-stage maturation tank, the intermediate maturation tank, and the final maturation tank to ensure that the maturation tank does not overflow or is not emptied. At the same time, the high liquid level value of the intermediate maturation tank and the high liquid level value of the final stage can be adjusted to change the volume of the solution in the maturation tank, thereby changing the maturation time of the polymer solution and ensuring that the maturation time is not too long.

[0026] A sampling port and a sampling valve are provided at the outlet of the aging tank. A ball valve is provided at the liquid outlet of each aging tank. The polymer solution transmission path is connected to the ball valve for use in conjunction with the polymer solution transmission path. A variable frequency liquid feeding pump, a pressure transmitter, a safety valve, an electromagnetic flowmeter, a sampling valve and a check valve are provided on each polymer solution transmission path. Under the opening and closing action of the ball valve and the self-priming action of the variable frequency liquid feeding pump, the matured polymer solution is transmitted to the pressurized liquid feeding module.

[0027] The surfactant tank liquid inlet of the surfactant injection skid is provided with a lifting assembly, which includes a ball valve and a gear pump to ensure that the surfactant is lifted into the surfactant tank;

[0028] The surfactant tank outlet of the surfactant injection skid is provided with a surfactant addition pump. The surfactant addition pump can be a delivery pump with stable and adjustable flow. The surfactant addition pump adopts frequency conversion control for metering and delivery. The delivery volume is automatically adjusted according to the set concentration, the rated displacement of the addition pump and the incoming water flow;

[0029] A ball valve and a filter are provided at the inlet of the surfactant adding pump, and a pressure transmitter, a safety valve, an electromagnetic flowmeter, a check valve and a ball valve are provided at the outlet of the surfactant adding pump.

[0030] The number of the booster injection skids is consistent with the number of target wells, and includes a sampling valve and a safety valve. The sampling valve is provided at the outlet of the hydraulic injection pump for sampling and testing the polymer solution; the safety valve is provided on the slurry outlet pipeline of the hydraulic injection pump to protect the hydraulic injection pump from overload and the injection well from overpressure, and cooperates with the hydraulic injection pump to inject the mixed polymer solution;

[0031] The hydraulic injection pump is equipped with an electromagnetic flowmeter, a pressure transmitter and a plug valve; the pressure transmitter is interlocked with the motor of the hydraulic injection pump to prevent the injection pressure from exceeding the wellhead pressure of the injection well; the electromagnetic flowmeter is used to detect and adjust the injection flow in real time; the hydraulic injection pump adopts variable frequency control to automatically adjust the injection volume according to the set value.

[0032] The digital control module is used in conjunction with the pressure protection component, liquid level protection component and oil temperature protection component to ensure safe and stable operation of the equipment;

[0033] A display unit and a software interface unit are integrated in the digital control module. The integrated display unit is used to realize remote centralized control of the equipment through the transmission function of a data card or a wireless bridge; the software interface unit is used to realize arbitrary switching among the operation monitoring interface, manual / automatic control interface, parameter setting interface, and report statistics interface;

[0034] The digital control module can monitor each process of the equipment operation in real time, display the overall status of the system operation and issue an alarm when an abnormality occurs.

[0035] In the parameter setting interface, you can input the basic parameters of the equipment operation, which can automatically calculate the operating parameters of each part and run according to the parameters. At the same time, you can set the corresponding alarm values ​​as needed.

[0036] The present invention adopts the above-mentioned structure, and decompresses the injected production water through a continuous mixing and pressurizing liquid feeding skid, disperses and grinds the polymer and enters the online continuous maturation skid; the diversion channel formed between the chambers of the online continuous maturation skid allows the polymer solution to flow along a predetermined route, thereby ensuring the maturation time of the polymer solution; through the provided production water transmission path and polymer solution transmission path, the production water and the matured polymer solution are pressurized through the pressurizing liquid feeding module and then transported to the static mixer; the addition ratio of production water, surfactant and polymer mother liquor is controlled by the multiphase mixing module, and the three media of polymer mother liquor, production water and surfactant are fully mixed to meet the needs of different numbers of injection wells and different injection processes, thereby obtaining polymer solutions of different concentrations, which has the advantages of precision, efficiency, safety and practicality. Description of the drawings:

[0037] Figure 1 Schematic diagram of the method of the present invention.

[0038] Figure 2 It is a schematic diagram of the process flow of two well groups of the present invention.

[0039] Figure 3 It is a schematic diagram of the process flow of the three-well group of the present invention. Specific implementation method:

[0040] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0041] like Figure 1-3 As shown in the figure, a method for preparing and outputting target liquid of a multi-well digital boost injection skid-mounted device comprises the following steps:

[0042] S1, the continuous mixing and pressurizing liquid feeding skid depressurizes the injected production water, disperses and grinds the polymer and feeds it into the online continuous maturation skid;

[0043] The continuous mixing and pressurizing liquid feeding skid includes a flow distribution module, which is used to achieve decompression and flow distribution of production water, and to distribute and adjust the water volume on demand for polymer mixing; a polymer adding, dispersing and dissolving module, which is used to store and transport dry powder materials to achieve rapid homogeneous mixing of polymers according to a set concentration; a pressurized liquid feeding module, which is used to pressurize the polymer solution in the aging tank through a liquid feeding pump and then transport it to a static mixer for mixing with a surfactant, and adopts PID control to achieve constant pressure liquid feeding by variable frequency control of the liquid feeding pump; a multiphase mixing module, which is used to complete the full mixing of the three media of polymer mother liquor, production water and surfactant by controlling the addition ratio of production water, surfactant and polymer mother liquor, and adjust the final injection concentration to obtain polymer solutions of different concentrations to meet the needs of different numbers of injection wells and different injection processes, and can also be adjusted in real time according to the feedback from the injection wells;

[0044] S2, a flow channel is formed between each chamber of the online continuous aging skid to allow the polymer solution to flow along a predetermined route, ensuring the aging time of the polymer solution. Multi-stage stirring is configured to accelerate the aging of the polymer, thereby completing the continuous stirring and online aging of the polymer and the produced water.

[0045] S3. Install a corresponding number of static mixers based on the number of target wells. Also, set up a corresponding number of production water transmission pathways and polymer solution transmission pathways between the continuous mixing and pressurized liquid feeding skid and the static mixers, and between the online continuous maturation skid and the static mixers. This allows the production water and the matured polymer solution to be pressurized and delivered to the static mixers via the pressurized liquid feeding module. The surfactant injection skid delivers the surfactant at a set concentration to the static mixer for mixing with the polymer solution.

[0046] S4: Multiple media are fully mixed through the multiphase mixing module, and the solution mixed in the static mixer is pressurized by the booster injection skid and injected into each target well to complete the configuration and output of the target solution.

[0047] S5 collects the equipment operating status and operating parameters and uploads them to the digital control module to achieve remote control and comprehensive monitoring of the system, and can perform parameter setting, one-button start and stop, fault alarm, real-time curve generation and historical data query.

[0048] A high-pressure electric ball valve is installed at the water inlet of the main line of the flow distribution module. The high-pressure electric ball valve is used to realize manual or automatic opening and closing, and cooperates with the pressure reducing valve installed at the rear end of the electric valve to meet the water supply requirements of high-speed mixing and grinding of polymers and dilution of polymer mother liquor;

[0049] A pressure transmitter is provided at the rear end of the pressure reducing valve, which is used to detect the output pressure and is interlocked with the high-pressure electric ball valve at the front end of the pressure reducing valve;

[0050] A flow regulating component is also provided at the rear end of the pressure reducing valve. The flow regulating component is set according to the well group data and adapted to the production water transmission path to realize automatic adjustment of the production water flow. The flow regulating component is an intelligent flow measuring and controlling instrument, which is equipped with a ball valve and a check valve.

[0051] The polymer in the dry powder tank of the polymer dosing, dispersing and dissolving module is quantitatively delivered to the high-speed mixing funnel according to the set concentration requirement. The corresponding instantaneous liquid flow rate and dry powder delivery rate can be automatically adjusted so that the production water forms a high-speed water flow in the high-speed mixing funnel through the injection component. After the polymer is initially mixed by the high-speed water flow, it enters the homogenizing component, which is a grinding pump. Under the action of the homogenizing component, the polymer is fully dissolved to obtain a polymer solution.

[0052] The polymer dosing, dispersing and dissolving module includes an intelligent flow measurement and control instrument, a screw feeding conveyor, a check valve, a weighing component and a homogenizing component.

[0053] The polymer dosing, dispersing and dissolving module can automatically adjust the incoming water flow to maintain and stabilize it at the set value. At the same time, it automatically calculates the polymer demand according to the set polymer concentration, and automatically adjusts the discharge amount of the screw feeder to maintain a certain ratio with the produced water, so that the polymer can be evenly transported to the high-speed mixing funnel to mix with the produced water, maintaining a constant polymer concentration.

[0054] The amount of polymer added and the flow of produced water can be automatically matched and controlled by a PLC program, and the polymer concentration deviation can be eliminated by regular cumulative measurement of the weighing component;

[0055] The model of the intelligent flow measurement and control instrument is GLZ-I I I50Z1.6, and the model of the weighing component is HT-CWC-4T.

[0056] In the pressurized liquid feeding module, the liquid feeding pump model is D2H375N. The outlet pressure of the liquid feeding pump can be detected by a pressure transmitter, and the displacement can be adjusted by frequency conversion to maintain a constant pressure at the outlet of the liquid feeding pump, ensuring stable liquid suction by the high-pressure injection pump. Low-shear sampling ports are set at the front and rear ends of the liquid feeding pump respectively. The rear end of the liquid feeding pump is connected to a safety valve, pressure transmitter, electromagnetic flowmeter, sampling valve and check valve.

[0057] Left-handed mixing units and right-handed mixing units are arranged in sections in the pipeline of the multiphase mixing module, so that the liquid continuously changes its flow direction between the left-handed mixing units and the right-handed mixing units, not only pushing the central liquid to the periphery, but also pushing the peripheral fluid to the center, producing a good radial mixing effect.

[0058] The aging tank of the online continuous aging skid adopts a multi-stage continuous aging mode; a multi-stage stirring assembly is installed in the aging tank. The multi-stage stirring assembly adopts fixed frequency control or variable frequency control to accelerate the aging of the polymer and shorten the aging time. The stirring speed is adjusted by variable frequency to ensure that the equipment can complete the aging of the polymer while reducing the shear effect of stirring on the polymer solution;

[0059] A connecting flow channel is formed between each chamber in the aging tank, so that the polymer solution flows along a predetermined route, ensuring that the polymer is fully matured within the process design time;

[0060] A diaphragm-type electronic liquid level gauge is installed in the maturation tank, and high and low liquid level protection can be set to ensure that the liquid level in the maturation tank is within an appropriate range. The diaphragm-type electronic liquid level gauge is installed in the first-stage maturation tank, the intermediate maturation tank, and the final maturation tank to ensure that the maturation tank does not overflow or is not emptied. At the same time, the high liquid level value of the intermediate maturation tank and the high liquid level value of the final stage can be adjusted to change the volume of the solution in the maturation tank, thereby changing the maturation time of the polymer solution and ensuring that the maturation time is not too long.

[0061] A sampling port and a sampling valve are provided at the outlet of the aging tank. A ball valve is provided at the liquid outlet of each aging tank. The polymer solution transmission path is connected to the ball valve for use in conjunction with the polymer solution transmission path. A variable frequency liquid feeding pump, a pressure transmitter, a safety valve, an electromagnetic flowmeter, a sampling valve and a check valve are provided on each polymer solution transmission path. Under the opening and closing action of the ball valve and the self-priming action of the variable frequency liquid feeding pump, the matured polymer solution is transmitted to the pressurized liquid feeding module.

[0062] The surfactant tank liquid inlet of the surfactant injection skid is provided with a lifting assembly, which includes a ball valve and a gear pump to ensure that the surfactant is lifted into the surfactant tank;

[0063] The surfactant tank outlet of the surfactant injection skid is provided with a surfactant addition pump. The surfactant addition pump can be a delivery pump with stable and adjustable flow. The surfactant addition pump adopts frequency conversion control for metering and delivery. The delivery volume is automatically adjusted according to the set concentration, the rated displacement of the addition pump and the incoming water flow;

[0064] A ball valve and a filter are provided at the inlet of the surfactant adding pump, and a pressure transmitter, a safety valve, an electromagnetic flowmeter, a check valve and a ball valve are provided at the outlet of the surfactant adding pump.

[0065] The number of the booster injection skids is consistent with the number of target wells, and includes a sampling valve and a safety valve. The sampling valve is provided at the outlet of the hydraulic injection pump for sampling and testing the polymer solution; the safety valve is provided on the slurry outlet pipeline of the hydraulic injection pump to protect the hydraulic injection pump from overload and the injection well from overpressure, and cooperates with the hydraulic injection pump to inject the mixed polymer solution;

[0066] The hydraulic injection pump is equipped with an electromagnetic flowmeter, a pressure transmitter and a plug valve; the pressure transmitter is interlocked with the motor of the hydraulic injection pump to prevent the injection pressure from exceeding the wellhead pressure of the injection well; the electromagnetic flowmeter is used to detect and adjust the injection flow in real time; the hydraulic injection pump adopts variable frequency control to automatically adjust the injection volume according to the set value.

[0067] The digital control module is used in conjunction with the pressure protection component, liquid level protection component and oil temperature protection component to ensure safe and stable operation of the equipment;

[0068] A display unit and a software interface unit are integrated in the digital control module. The integrated display unit is used to realize remote centralized control of the equipment through the transmission function of a data card or a wireless bridge; the software interface unit is used to realize arbitrary switching among the operation monitoring interface, manual / automatic control interface, parameter setting interface, and report statistics interface;

[0069] The digital control module can monitor each process of the equipment operation in real time, display the overall status of the system operation and issue an alarm when an abnormality occurs.

[0070] In the parameter setting interface, you can input the basic parameters of the equipment operation, which can automatically calculate the operating parameters of each part and run according to the parameters. At the same time, you can set the corresponding alarm values ​​as needed.

[0071] The working principle of the target liquid preparation and output method of the multi-well digital booster injection skid-mounted equipment in the embodiment of the present invention is: based on the mutual linkage and coordination of multiple functional modules, the "low-pressure mixing, multi-pump to multi-well" method is adopted to configure and output the target liquid according to the specific number and actual needs of multiple target wells. The overall process can be unmanned except for the manual feeding process. Through digital automation control, the overall work efficiency and work accuracy of the skid-mounted equipment are improved, and the stability of the viscosity of the configured target liquid is improved. The overall operation process is in an automatic control state. Each skid-mounted equipment adopts an integrated unified control mode. The work process is smooth and safe. Once an abnormal situation occurs, it can be warned in time, which can better meet the actual automation control application needs. It can be applicable to a variety of different types of injection skid-mounted equipment and application scenarios, which is convenient for promotion and popularization.

[0072] Since the pressurized injection skid-mounted equipment integrates multiple functional components such as valves, pumps, and sensors, a digital control module is required for integrated control and unified regulation in the process of overall pressurized injection of polymers. Compared with the decentralized control mode in the prior art, the integrated control mode of the present application can not only ensure that each functional device fully plays its corresponding role, but also enable different functional devices to operate synchronously and cooperate with each other to complete the pressurized injection of polymer solutions. The overall equipment combines low-pressure mixing, digital collection, intelligent deployment and intelligent remote control design. Except for manual loading, other functional modules are all automatically operated, automatically collect and transmit data, and remotely controlled.

[0073] In the overall solution, the multi-well preparation and output method includes the following steps: the continuous mixing and pressurizing liquid feeding skid decompresses the injected production water, disperses and grinds the polymer and feeds it into the online continuous maturation skid; a diversion channel is formed between the chambers of the online continuous maturation skid to make the polymer solution flow along a predetermined route, ensuring the maturation time of the polymer solution, and configuring multi-stage stirring to accelerate the maturation of the polymer, thereby completing the continuous mixing and online maturation of the polymer and the production water; a corresponding number of static mixers are set according to the number of target wells, and a corresponding number of production water transfer units are set between the continuous mixing and pressurizing liquid feeding skid and the static mixer, and between the online continuous maturation skid and the static mixer. The transmission path and polymer solution transmission path are used to pressurize the production water and the matured polymer solution through the booster feeding module and then deliver them to the static mixer. The surfactant injection skid delivers the surfactant to the static mixer at the set concentration to mix with the polymer solution; the multiple media are fully mixed through the multiphase mixing module, and the solution mixed in the static mixer is pressurized by the booster injection skid and then injected into each target well respectively to complete the configuration and output of the target liquid; the equipment operating status and operating parameters are collected and uploaded to the digital control module to realize remote control and comprehensive monitoring of the system, and can perform parameter setting, one-button start and stop, fault alarm, real-time curve generation and historical data query.

[0074] The high and low pressure connection process pipelines between each device are all connected by hoses and quick-change joints, and the connecting cables between the devices are all connected by bolts. The whole set of equipment can be quickly assembled and disassembled; the welding process of the overall equipment should adopt argon electric welding, and each weld should be polished smooth, without burrs and welding defects.

[0075] Generally speaking, digital control modules are installed in each skid-mounted equipment, so that the entire process, except for adding polymer powder and unloading surfactant, does not require manual operation and realizes digital automatic control.

[0076] Specifically, in the overall process, the viscosity loss change of the equipment can be detected by detecting the specific viscosity value of each node, thereby evaluating and detecting the overall boost injection process.

[0077] The continuous mixing and pressurized liquid feeding skid includes a flow distribution module, which is used to achieve decompression and flow distribution of production water, and to distribute and adjust the water volume on demand for polymer mixing; a polymer addition, dispersion and dissolution module, which is used to store and transport dry powder materials to achieve rapid homogeneous mixing of polymers according to the set concentration; a pressurized liquid feeding module, which is used to pressurize the polymer solution in the aging tank through a liquid feeding pump and then transport it to the static mixer for mixing with the surfactant, and adopts PID control to achieve constant pressure liquid feeding by variable frequency control of the liquid feeding pump; a multiphase mixing module, which is used to complete the sufficient mixing of the three media of polymer mother liquor, production water and surfactant by controlling the addition ratio of production water, surfactant and polymer mother liquor, adjust the final injection concentration, and obtain polymer solutions of different concentrations to meet the needs of different numbers of injection wells and different injection processes, and can also make real-time adjustments according to the feedback from the injection wells.

[0078] According to the specific number of target wells, a corresponding number of functional equipment is set up to enable the configuration and injection of the polymer solution of each target well to be carried out synchronously to meet the actual use needs of each target well; compared with the single-well working mode of mixing surfactant and polymer mother liquor, this application adopts a working mode of mixing three media: polymer mother liquor, production water, and surfactant, which can obtain polymer solutions with a wider range of concentrations and is applicable to a wider range of application scenarios and environments.

[0079] Preferably, a high-pressure electric ball valve is provided at the water inlet of the main line of the flow distribution module. The high-pressure electric ball valve is used to realize manual or automatic opening and closing, and cooperates with the pressure reducing valve provided at the rear end of the electric valve to meet the water supply requirements of high-speed mixing and grinding of polymers and dilution of polymer mother liquor; a pressure transmitter is provided at the rear end of the pressure reducing valve, and the pressure transmitter is used to detect the output pressure and interlock with the high-pressure electric ball valve at the front end of the pressure reducing valve; a flow regulating component is also provided at the rear end of the pressure reducing valve, and the flow regulating component is set according to the well group data and adapted to the production water transmission path to realize automatic adjustment of the production water flow. The flow regulating component is an intelligent flow measuring and controlling instrument, and a ball valve and a check valve are configured on the intelligent flow measuring and controlling instrument.

[0080] Through the coordinated action of the above-mentioned multiple electrical components, the water volume is distributed and adjusted on demand for polymer mixing to ensure the configuration quality of the polymer solution; the high-pressure water pipeline is reduced in pressure through a pilot-operated pressure reducing valve, and the pressure reduction range is reduced from 11 MPa to 1.6 MPa, meeting the water supply needs of high-speed mixing and grinding of polymers.

[0081] Preferably, the polymer in the dry powder tank of the polymer dosing, dispersion and dissolution module is quantitatively delivered to the high-speed mixing funnel according to the set concentration requirements, and the corresponding instantaneous liquid flow and dry powder delivery volume can be automatically adjusted so that the production water forms a high-speed water flow in the high-speed mixing funnel through the injection component, and the polymer enters the homogenization component after initial mixing by the high-speed water flow, and the homogenization component is a grinding pump; under the action of the homogenization component, the polymer is fully dissolved to obtain a polymer solution; for the polymer dosing, dispersion and dissolution module, it includes an intelligent flow measurement and control instrument, a screw feeding conveyor, a check valve, a weighing component and a homogenization component; in the polymer dosing, dispersion and dissolution module, the incoming water flow can be automatically adjusted to maintain and stabilize at the set value; the polymer dry powder addition amount and the production water flow are automatically matched and controlled by the PLC program, and a weighing component is configured on the polymer dry powder tank, which can regularly perform cumulative measurement of the polymer addition amount and compare it with the theoretical feeding amount, thereby eliminating the polymer concentration deviation.

[0082] Preferably, the feeding pump of the pressurized feeding module uses a low-shear, self-priming delivery pump, and adopts PID control technology to realize variable frequency control of the feeding pump to feed liquid at constant pressure. The flow accuracy requirement is not less than level 1.5, and the viscosity loss rate is ≤2%.

[0083] Preferably, the pipeline of the multiphase mixing module is segmented with left-handed mixing units and right-handed mixing units, so that the liquid continuously changes its flow direction between the left-handed mixing units and the right-handed mixing units, not only pushing the central liquid to the periphery, but also pushing the peripheral fluid to the center, producing a good radial mixing effect; completing the full mixing of polymer target liquid, surfactant and other media.

[0084] In this application, the online continuous maturation skid is the core component, capable of continuously stirring the polymer and production water for online maturation. The corresponding maturation tank adopts a multi-stage continuous maturation form. A multi-stage stirring assembly is provided in the maturation tank. The multi-stage stirring assembly adopts fixed frequency control or variable frequency control to accelerate the maturation of the polymer and shorten the maturation time. The stirring speed is adjusted by variable frequency to ensure that the equipment can complete the maturation of the polymer while reducing the shear effect of stirring on the polymer solution. The various chambers in the maturation tank are connected to form a diversion channel, so that the polymer solution flows along a predetermined route, ensuring that the polymer is fully matured within the process design time.

[0085] Correspondingly, a diaphragm-type electronic liquid level gauge is provided in the maturation tank, which can be set with high liquid level protection and low liquid level protection to ensure that the liquid level in the maturation tank is within an appropriate range; the diaphragm-type electronic liquid level gauge is provided in the first-stage maturation tank, the intermediate maturation tank, and the final maturation tank to ensure that the maturation tank does not overflow or is not emptied; at the same time, the volume of the solution in the maturation tank can be changed by adjusting the high liquid level value of the intermediate maturation tank and the high liquid level value of the final stage, thereby changing the maturation time of the polymer solution and ensuring that the maturation time is not too long.

[0086] A sampling port and a sampling valve are provided at the outlet of the aging tank. A ball valve is provided at the liquid outlet of each aging tank. The polymer solution transmission path is connected to the ball valve for use in conjunction with the polymer solution transmission path. A variable frequency liquid feeding pump, a pressure transmitter, a safety valve, an electromagnetic flowmeter, a sampling valve and a check valve are provided on each polymer solution transmission path. Under the opening and closing action of the ball valve and the self-priming action of the variable frequency liquid feeding pump, the matured polymer solution is transmitted to the pressurized liquid feeding module.

[0087] For the surfactant injection skid, a lifting assembly is provided at the liquid inlet of the surfactant tank, and the lifting assembly includes a ball valve and a gear pump to ensure that the surfactant is lifted into the surfactant tank; the liquid outlet of the surfactant tank of the surfactant injection skid is provided with a surfactant addition pump, and the surfactant addition pump can use a delivery pump with stable and adjustable flow. The surfactant addition pump adopts frequency conversion control for metering and delivery, and the delivery volume is automatically adjusted according to the set concentration, the rated displacement of the addition pump and the incoming water flow; a ball valve and a filter are provided at the inlet of the surfactant addition pump, and a pressure transmitter, a safety valve, an electromagnetic flowmeter, a check valve and a ball valve are provided at the outlet of the surfactant addition pump.

[0088] According to the different injection concentrations of surfactants, the displacement is adjusted to the injection displacement using frequency conversion control, which is more flexible and practical.

[0089] As for the booster injection skids, their number is consistent with the number of target wells, including sampling valves and safety valves. The sampling valve is set at the outlet of the hydraulic injection pump for sampling and testing the polymer solution; the safety valve is set on the slurry outlet pipeline of the hydraulic injection pump to protect the hydraulic injection pump from overload and the injection well from overpressure, and cooperate with the hydraulic injection pump to inject the mixed polymer solution.

[0090] The hydraulic injection pump is equipped with an electromagnetic flowmeter, a pressure transmitter and a plug valve; the pressure transmitter is interlocked with the motor of the hydraulic injection pump to prevent the injection pressure from exceeding the wellhead pressure of the injection well; the electromagnetic flowmeter is used to detect and adjust the injection flow in real time; the hydraulic injection pump adopts variable frequency control to automatically adjust the injection volume according to the set value.

[0091] In order to meet the requirements of the subsequent construction of related measures for the injection pump, a certain amount of redundancy must be considered for the maximum injection pressure to avoid excessive injection pressure.

[0092] The automatic control mode of the present application is: the digital control module is used in conjunction with the pressure protection component, the liquid level protection component and the oil temperature protection component to ensure the safe and stable operation of the equipment; the display unit and the software interface unit are integrated in the digital control module, and the integrated display unit is used to realize remote centralized control of the equipment through the transmission function of the data card or the wireless bridge; the software interface unit is used to realize arbitrary switching of the operation monitoring interface, the manual / automatic control interface, the parameter setting interface, and the report statistics interface; the digital control module can monitor each process of the equipment operation in real time, display the overall status of the system operation and alarm when an abnormality occurs.

[0093] For the digital control module, it must be able to monitor all parts of the entire system and display the overall status of the system operation; display the instantaneous and cumulative flow rates of production water, mother liquor, and surfactant; display the instantaneous and cumulative addition amount of polymer dry powder; display the instantaneous flow rate and cumulative injection amount of the injection pump; display the instantaneous pressure value of each part of the system, the temperature value of the continuous maturation tank, the liquid level, the screw pump frequency, etc.

[0094] In order to improve feedback accuracy, the collection frequency can be set to once every 0.5 seconds; the digital control module can automatically produce data report statistics and set the corresponding time interval to generate data.

[0095] It should be noted that in this application, the parameter setting interface can input the parameters of the equipment operation, automatically calculate the operating parameters of each part, and operate according to the parameters. At the same time, the corresponding alarm values ​​can be set as needed, which greatly improves the flexibility and application scope of the system.

[0096] To sum up, the target liquid preparation and output method of the multi-well digital booster injection skid-mounted equipment in the embodiment of the present invention is based on the mutual linkage and coordination of multiple functional modules, and adopts the "low-pressure mixing, multi-pump to multi-well" method to configure and output the target liquid according to the specific number and actual needs of multiple target wells. The overall process can be unmanned except for the manual feeding process. Through digital automation control, the overall work efficiency and work accuracy of the skid-mounted equipment are improved, and the stability of the viscosity of the configured target liquid is improved. The overall operation process is in an automatic control state. Each skid-mounted equipment adopts an integrated unified control mode. The work process is smooth and safe. Once an abnormal situation occurs, it can be warned in time, which can better meet the actual automation control application needs. It can be applicable to a variety of different types of injection skid-mounted equipment and application scenarios, which is convenient for promotion and popularization.

[0097] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any replacement, improvement or transformation made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0098] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. A method for preparing and outputting target liquid using a multi-well digital booster injection skid-mounted device, characterized in that: The preparation output method comprises the following steps: S1, the continuous mixing and pressurizing liquid feeding skid depressurizes the injected production water, disperses and grinds the polymer and feeds it into the online continuous maturation skid; The continuous mixing and pressurizing liquid feeding skid includes a flow distribution module, which is used to achieve decompression and flow distribution of production water, and to distribute and adjust the water volume on demand for polymer mixing; a polymer adding, dispersing and dissolving module, which is used to store and transport dry powder materials to achieve rapid homogeneous mixing of polymers according to a set concentration; a pressurized liquid feeding module, which is used to pressurize the polymer solution in the aging tank through a liquid feeding pump and then transport it to a static mixer for mixing with a surfactant, and adopts PID control to achieve constant pressure liquid feeding by variable frequency control of the liquid feeding pump; a multiphase mixing module, which is used to complete the full mixing of the three media of polymer mother liquor, production water and surfactant by controlling the addition ratio of production water, surfactant and polymer mother liquor, and adjust the final injection concentration to obtain polymer solutions of different concentrations to meet the needs of different numbers of injection wells and different injection processes, and can also be adjusted in real time according to the feedback from the injection wells; S2, a flow channel is formed between each chamber of the online continuous aging skid to allow the polymer solution to flow along a predetermined route, ensuring the aging time of the polymer solution. Multi-stage stirring is configured to accelerate the aging of the polymer, thereby completing the continuous stirring and online aging of the polymer and the produced water. S3. Install a corresponding number of static mixers based on the number of target wells. Also, set up a corresponding number of production water transmission pathways and polymer solution transmission pathways between the continuous mixing and pressurized liquid feeding skid and the static mixers, and between the online continuous maturation skid and the static mixers. This allows the production water and the matured polymer solution to be pressurized and delivered to the static mixers via the pressurized liquid feeding module. The surfactant injection skid delivers the surfactant at a set concentration to the static mixer for mixing with the polymer solution. S4: Multiple media are fully mixed through the multiphase mixing module, and the solution mixed in the static mixer is pressurized by the pressurized injection skid and injected into each target well to complete the configuration and output of the target solution. S5 collects the equipment operating status and operating parameters and uploads them to the digital control module to achieve remote control and comprehensive monitoring of the system, and can perform parameter setting, one-button start and stop, fault alarm, real-time curve generation and historical data query.

2. The method for preparing and outputting target liquid for a multi-well digital boost injection skid-mounted device according to claim 1, characterized in that: A high-pressure electric ball valve is installed at the water inlet of the main line of the flow distribution module. The high-pressure electric ball valve is used to realize manual or automatic opening and closing, and cooperates with the pressure reducing valve installed at the rear end of the electric valve to meet the water supply requirements of high-speed mixing and grinding of polymers and dilution of polymer mother liquor; A pressure transmitter is provided at the rear end of the pressure reducing valve, which is used to detect the output pressure and is interlocked with the high-pressure electric ball valve at the front end of the pressure reducing valve; A flow regulating component is also provided at the rear end of the pressure reducing valve. The flow regulating component is set according to the well group data and adapted to the production water transmission path to realize automatic adjustment of the production water flow. The flow regulating component is an intelligent flow measuring and controlling instrument, which is equipped with a ball valve and a check valve.

3. The method for preparing and outputting target liquid for a multi-well digital boost injection skid-mounted device according to claim 1, characterized in that: The polymer in the dry powder tank of the polymer dosing, dispersing and dissolving module is quantitatively delivered to the high-speed mixing funnel according to the set concentration requirement. The corresponding instantaneous liquid flow rate and dry powder delivery rate can be automatically adjusted so that the production water forms a high-speed water flow in the high-speed mixing funnel through the injection component. After the polymer is initially mixed by the high-speed water flow, it enters the homogenizing component, which is a grinding pump. Under the action of the homogenizing component, the polymer is fully dissolved to obtain a polymer solution. The polymer dosing, dispersing and dissolving module includes an intelligent flow measurement and control instrument, a screw feeding conveyor, a check valve, a weighing component and a homogenizing component.

4. The method for preparing and outputting target liquid for a multi-well digital boost injection skid-mounted device according to claim 3, characterized in that: The polymer dosing, dispersing and dissolving module can automatically adjust the incoming water flow to maintain and stabilize it at the set value. At the same time, it automatically calculates the polymer demand according to the set polymer concentration, and automatically adjusts the discharge amount of the screw feeder to maintain a certain ratio with the produced water, so that the polymer can be evenly transported to the high-speed mixing funnel to mix with the produced water, maintaining a constant polymer concentration. The amount of polymer added and the flow of produced water can be automatically matched and controlled by a PLC program, and the polymer concentration deviation can be eliminated by regular cumulative measurement of the weighing component; The model of the intelligent flow measurement and control instrument is GLZ-I I I50Z1.6, and the model of the weighing component is HT-CWC-4T.

5. The method for preparing and outputting target liquid for a multi-well digital boost injection skid-mounted device according to claim 1, characterized in that: In the pressurized liquid feeding module, the liquid feeding pump model is D2H375N. The outlet pressure of the liquid feeding pump can be detected by a pressure transmitter, and the displacement can be adjusted by frequency conversion to maintain a constant pressure at the outlet of the liquid feeding pump, ensuring stable liquid suction by the high-pressure injection pump. Low-shear sampling ports are set at the front and rear ends of the liquid feeding pump respectively. The rear end of the liquid feeding pump is connected to a safety valve, pressure transmitter, electromagnetic flowmeter, sampling valve and check valve. Left-handed mixing units and right-handed mixing units are arranged in sections in the pipeline of the multiphase mixing module, so that the liquid continuously changes its flow direction between the left-handed mixing units and the right-handed mixing units, not only pushing the central liquid to the periphery, but also pushing the peripheral fluid to the center, producing a good radial mixing effect.

6. The method for preparing and outputting target liquid for a multi-well digital boost injection skid-mounted device according to claim 1, characterized in that: The aging tank of the online continuous aging skid adopts a multi-stage continuous aging mode; a multi-stage stirring assembly is installed in the aging tank. The multi-stage stirring assembly adopts fixed frequency control or variable frequency control to accelerate the aging of the polymer and shorten the aging time. The stirring speed is adjusted by variable frequency to ensure that the equipment can complete the aging of the polymer while reducing the shear effect of stirring on the polymer solution; A connecting flow channel is formed between each chamber in the aging tank, so that the polymer solution flows along a predetermined route, ensuring that the polymer is fully matured within the process design time; A diaphragm-type electronic liquid level gauge is installed in the maturation tank, and high and low liquid level protection can be set to ensure that the liquid level in the maturation tank is within an appropriate range. The diaphragm-type electronic liquid level gauge is installed in the first-stage maturation tank, the intermediate maturation tank, and the final maturation tank to ensure that the maturation tank does not overflow or is not emptied. At the same time, the high liquid level value of the intermediate maturation tank and the high liquid level value of the final stage can be adjusted to change the volume of the solution in the maturation tank, thereby changing the maturation time of the polymer solution and ensuring that the maturation time is not too long. A sampling port and a sampling valve are provided at the outlet of the aging tank. A ball valve is provided at the liquid outlet of each aging tank. The polymer solution transmission path is connected to the ball valve for use in conjunction with the polymer solution transmission path. A variable frequency liquid feeding pump, a pressure transmitter, a safety valve, an electromagnetic flowmeter, a sampling valve and a check valve are provided on each polymer solution transmission path. Under the opening and closing action of the ball valve and the self-priming action of the variable frequency liquid feeding pump, the matured polymer solution is transmitted to the pressurized liquid feeding module.

7. The method for preparing and outputting target liquid for a multi-well digital boost injection skid-mounted device according to claim 1, characterized in that: The surfactant tank liquid inlet of the surfactant injection skid is provided with a lifting assembly, which includes a ball valve and a gear pump to ensure that the surfactant is lifted into the surfactant tank; The surfactant tank outlet of the surfactant injection skid is provided with a surfactant addition pump. The surfactant addition pump can be a delivery pump with stable and adjustable flow. The surfactant addition pump adopts frequency conversion control for metering and delivery. The delivery volume is automatically adjusted according to the set concentration, the rated displacement of the addition pump and the incoming water flow; A ball valve and a filter are provided at the inlet of the surfactant adding pump, and a pressure transmitter, a safety valve, an electromagnetic flowmeter, a check valve and a ball valve are provided at the outlet of the surfactant adding pump.

8. The method for preparing and outputting target liquid for a multi-well digital boost injection skid-mounted device according to claim 1, characterized in that: The number of the booster injection skids is consistent with the number of target wells, and includes a sampling valve and a safety valve. The sampling valve is provided at the outlet of the hydraulic injection pump for sampling and testing the polymer solution; the safety valve is provided on the slurry outlet pipeline of the hydraulic injection pump to protect the hydraulic injection pump from overload and the injection well from overpressure, and cooperates with the hydraulic injection pump to inject the mixed polymer solution; The hydraulic injection pump is equipped with an electromagnetic flowmeter, a pressure transmitter and a plug valve; the pressure transmitter is interlocked with the motor of the hydraulic injection pump to prevent the injection pressure from exceeding the wellhead pressure of the injection well; the electromagnetic flowmeter is used to detect and adjust the injection flow in real time; the hydraulic injection pump adopts variable frequency control to automatically adjust the injection volume according to the set value.

9. The method for preparing and outputting target liquid for a multi-well digital boost injection skid-mounted device according to claim 1, characterized in that: The digital control module is used in conjunction with the pressure protection component, liquid level protection component and oil temperature protection component to ensure safe and stable operation of the equipment; A display unit and a software interface unit are integrated in the digital control module. The integrated display unit is used to realize remote centralized control of the equipment through the transmission function of a data card or a wireless bridge; the software interface unit is used to realize arbitrary switching among the operation monitoring interface, manual / automatic control interface, parameter setting interface, and report statistics interface; The digital control module can monitor each process of the equipment operation in real time, display the overall status of the system operation and issue an alarm when an abnormality occurs.

10. The method for preparing and outputting target liquid for multi-well digital boost injection skid-mounted equipment according to claim 9, characterized in that: In the parameter setting interface, you can input the basic parameters of the equipment operation, which can automatically calculate the operating parameters of each part and run according to the parameters. At the same time, you can set the corresponding alarm values ​​as needed.

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