An automatic water injection control method and system for green electricity supply

Abstract

This invention relates to the field of oilfield water injection technology, and in particular discloses an automatic water injection control method and system under green energy supply. The method includes the following steps: S1, predicting the green energy power generation of the block based on generator parameters, meteorological parameters, and environmental parameters; S2, determining the water injection power consumption ratio based on the block's power generation, and determining the water injection pump operation plan; S3, executing the water injection pump operation plan, monitoring real-time water injection parameters, and performing dynamic control. This invention obtains the water injection pump operation plan through power generation analysis and prediction, which is used to guide water injection well production. Under the premise of ensuring the effectiveness of water drive development and not damaging the reservoir, the automatic water injection control system forms a water injection control method that is highly matched with the green energy power generation efficiency, improves the self-consumption of green energy, effectively reduces wind and solar curtailment rates, reduces energy waste, and effectively solves the problems of insufficient green energy supply and local over-generation that occur in conventional water injection modes.

Description

Technical Field

[0001] This invention relates to the field of oilfield water injection technology, specifically to an automatic water injection control method and system under green electricity power supply. Background Technology

[0002] my country's oilfields utilize water injection for development, primarily through continuous, periodic, and pulsed water injection methods, powered by grid electricity. This approach suffers from high energy consumption and costs. Under the strategic goals of carbon peaking and carbon neutrality, green electricity capacity and its proportion in energy supply are continuously increasing. However, green electricity generation is stochastic and non-stationary. Using conventional water injection methods can lead to insufficient green electricity supply and localized over-generation, resulting in energy waste.

[0003] For example, utility model patent application number 201520894571.4 discloses an intelligent intermittent water injection process surface control system. This system includes tubing and a digital intelligent water distributor installed on the tubing, as well as a ground controller and a host computer. The ground controller is connected to the host computer, feeding back information and executing commands issued by the host computer. Simultaneously, the ground controller is connected to the digital intelligent water distributor via cable, controlling its operation according to preset control information. This utility model features automatic adjustment of injection volume at each layer, real-time monitoring and storage of downhole pressure, temperature, and flow parameters, automatic downhole sealing verification, and formation rotation injection control functions. The ground controller connects to the digital intelligent water distributor via cable, using the cable for bidirectional data and command transmission, enabling direct data reading and real-time control.

[0004] Existing technologies for water injection regulation under green electricity supply mainly have the following problems: the power modules use mains power or vehicle batteries, which require stable power and are not suitable for green electricity such as wind power and photovoltaic power generation; the intelligent control system is suitable for conventional intermittent water injection and automatically executes the injection cycle plan, but water injection under green electricity supply needs to optimize the water injection plan in a timely manner according to the power generation, and lacks organic integration with green electricity.

[0005] In conclusion, how to combine green electricity random unsteady power supply with water injection control system while ensuring the effectiveness of water drive development and without damaging the reservoir has become an urgent problem to be solved. Summary of the Invention

[0006] To address existing technical problems, this invention proposes an automatic water injection control system for green electricity supply. Under the premise of ensuring the effectiveness of water drive development and not damaging the reservoir, the automatic water injection control system forms a water injection control method that is highly matched with the green electricity generation efficiency, thereby improving the self-consumption of green electricity, effectively reducing wind and solar curtailment rates, and reducing energy waste.

[0007] According to one aspect of the present invention, an automatic water injection control method for green electricity supply is provided, comprising the following steps: S1. Predict the green energy power generation capacity of the block based on generator set parameters, meteorological parameters and environmental parameters; S2. Determine the proportion of electricity used for water injection based on the block's power generation capacity, and determine the working plan for the water injection pump; S3. Implement the water injection pump operation plan, monitor real-time water injection parameters, and make dynamic adjustments.

[0008] According to one embodiment of the present invention, the generator set parameters include factors affecting green electricity generation power, and the water injection parameters include water injection pump parameters, injection-production relationship and oil-water well parameters.

[0009] According to an embodiment of the present invention, in step S1, predicting the block's power generation further includes: Power generation is predicted based on meteorological parameters, environmental parameters, equipment operating parameters, and a power generation prediction calculation model.

[0010] According to one embodiment of the present invention, the meteorological parameters include one or more of ambient temperature, relative humidity, wind speed, wind direction and air pressure, and the environmental parameters include radiation intensity.

[0011] According to one embodiment of the present invention, determining the working scheme of the water injection pump includes determining the output displacement and running time of the water injection pump.

[0012] According to one embodiment of the present invention, the real-time water injection parameters include one or more of the following: instantaneous water injection volume, water nozzle opening, pressure before the nozzle, and pressure after the nozzle.

[0013] According to one embodiment of the present invention, the control method further includes executing a water injection scheme, which includes pulsed water injection and / or intermittent water injection.

[0014] According to one embodiment of the present invention, the control method further includes evaluating the water drive effect based on real-time water injection parameters. The water drive effect evaluation includes one or more of the following: water injection qualification rate evaluation, water absorption capacity change evaluation, formation property change evaluation, and development effect evaluation.

[0015] According to one embodiment of the present invention, the working scheme of the water injection pump includes a short-term scheme and a medium-to-long-term scheme. The short-term scheme includes a design scheme based on hours and / or days / weeks, and the medium-to-long-term scheme includes a design scheme based on years.

[0016] According to another aspect of the present invention, an automatic water injection control system for green electricity supply is proposed, comprising: The power generation prediction module is configured to predict the block's power generation based on generator parameters, meteorological parameters, and environmental parameters. The power consumption matching and water injection pump scheme formulation module is configured to determine the proportion of water injection power consumption based on the block power generation and determine the water injection pump operation scheme. The automatic water injection scheme control module is configured to execute the water injection pump operation plan, monitor real-time water injection parameters of a single well, and perform dynamic control; and The real-time water injection parameter acquisition and evaluation module is configured to evaluate the water drive effect based on real-time water injection parameters.

[0017] By adopting the above technical solutions, this invention has the following advantages compared with existing technologies: While ensuring that the efficiency of water-driven development is not compromised and the reservoir is safe, the use of an automatic water injection control system achieves a high degree of synergy with the efficiency of green power generation, thereby optimizing the water injection control strategy. This measure significantly enhances the self-consumption capacity of green electricity, effectively reduces the wind and solar curtailment rates caused by supply-demand mismatch during wind and solar power generation, and further reduces the waste of energy resources. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some implementation examples of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart of an automatic water injection control method under green electricity supply according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of an automatic water injection control system under green electricity supply according to an embodiment of the present invention is shown. Detailed Implementation

[0020] The following detailed description of the embodiments is intended to exemplify the principles of the present invention, but should not be construed as limiting the scope of the invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0021] These embodiments are provided to make this disclosure thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0022] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0024] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0025] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0026] This invention provides an automatic water injection control method and system for green electricity supply. Figure 1 A process flow diagram of an exemplary automatic water injection control method under green electricity supply according to the present invention is shown, which specifically includes the following steps: S1. Predict the green energy power generation capacity of the block based on generator set parameters, meteorological parameters and environmental parameters; S2. Determine the proportion of electricity used for water injection based on the block's power generation capacity, and determine the working plan for the water injection pump; S3. Implement the water injection pump operation plan, monitor real-time water injection parameters, and make dynamic adjustments.

[0027] In some specific embodiments, generator parameters include factors affecting green electricity generation power, and water injection parameters include water injection pump parameters, injection-production relationship, and oil-water well parameters.

[0028] In some specific embodiments, step S1, predicting the block's power generation, further includes: Power generation is predicted based on meteorological parameters, environmental parameters, equipment operating parameters, and a power generation prediction calculation model.

[0029] The power generation prediction calculation model adopts an ultra-short cycle prediction model, a short cycle prediction model, and a medium-to-long-term prediction model to predict power generation in hours, days, and weeks, respectively. The short cycle and ultra-short cycle prediction models are used to formulate the working plan of the water injection pump at different times of the day; the medium-to-long-term prediction model guides the selection of water injection pumps and the formulation of medium-to-long-term working plans for water injection pumps.

[0030] In some specific embodiments, meteorological parameters include one or more of ambient temperature, relative humidity, wind speed, wind direction, and air pressure, and environmental parameters include radiation intensity.

[0031] Factors that enable prediction of power generation include historical power generation data, weather forecast data, and equipment operating status. Common examples include photovoltaic (PV) power generation and wind power generation. In PV power generation prediction, key parameters include solar radiation intensity, temperature, wind speed, cloud cover, and PV module characteristics.

[0032] In some specific embodiments, determining the water injection pump operating scheme includes determining the water injection pump's output displacement and operating time.

[0033] In some specific embodiments, the real-time water injection parameters include one or more of the following: instantaneous water injection volume, nozzle opening, pressure before nozzle, and pressure after nozzle.

[0034] In some specific embodiments, the control method further includes executing a water injection scheme, which includes pulsed water injection and / or intermittent water injection.

[0035] In some specific embodiments, the control method also includes evaluating the water drive effect based on real-time water injection parameters. The water drive effect evaluation includes one or more of the following: water injection qualification rate evaluation, water absorption capacity change evaluation, formation property change evaluation, and development effect evaluation.

[0036] In some specific embodiments, the water injection pump operating scheme includes short-term schemes and medium-to-long-term schemes. Short-term schemes include design schemes based on hours and / or days / weeks, while medium-to-long-term schemes include design schemes based on years.

[0037] Short-term plans are formulated based on the green energy generation capacity and the formation's maximum injection rate. Medium- and long-term plans are formulated based on the green energy generation method, power generation capacity, medium- and long-term working plan of the water injection pump, water conveyance pressure, injection-production ratio, and water injection mode, usually in units of years.

[0038] The flow rate should be automatically adjusted to implement the water injection plan. It should also have the function of automatic adjustment within the range of injection error and constant water injection to avoid damage to the reservoir.

[0039] This invention also proposes an automatic water injection control system under green electricity supply, which includes: The power generation prediction module is configured to predict the block's power generation based on generator parameters, meteorological parameters, and environmental parameters. The power consumption matching and water injection pump scheme formulation module is configured to determine the proportion of water injection power consumption based on the block power generation and determine the water injection pump operation scheme. The automatic water injection scheme control module is configured to execute the water injection pump operation plan, monitor real-time water injection parameters of a single well, and perform dynamic control; and The real-time water injection parameter acquisition and evaluation module is configured to evaluate the water drive effect based on real-time water injection parameters.

[0040] The various functional modules of the automatic water injection control system under green electricity supply can work together to formulate and execute water injection plans. The power generation prediction module is used for inputting dynamic influencing factors and predicting power generation. The dynamic influencing factor input module collects and processes dynamically changing indicators, including dynamic influencing factors such as meteorological parameters and environmental parameters, as well as historical data of measured green electricity power generation.

[0041] The power generation prediction calculation model predicts power generation based on key parameters, calculation model and historical measured power generation values, and then determines the power consumption for water injection in different periods.

[0042] The power consumption matching and water injection station discharge adjustment module aims for efficient development of the block. It comprehensively considers the green energy generation capacity and the overall power consumption of the block to match the water injection power consumption, taking into account factors such as oil well power consumption, combined station power consumption, and surface power consumption. Furthermore, it determines the water injection pump operation plan, including daily and long-term operation plans. In addition, the water injection pump should have an automatic adjustment function to automatically execute the above plans.

[0043] The real-time water injection parameter acquisition and evaluation module is used for real-time water injection parameter acquisition and water drive effect evaluation. Real-time water injection parameters include instantaneous water injection volume, nozzle opening, inlet pressure, and outlet pressure. These key water injection indicators provide data support for the evaluation model; the evaluation model includes, but is not limited to, evaluation of water injection qualification rate, evaluation of changes in water absorption capacity, evaluation of changes in formation properties, and evaluation of development effect. It is used to evaluate the water drive effect under green energy supply and also for the optimization design of real-time water injection schemes.

[0044] Based on the above embodiments, the water injection system also includes an intelligent water distributor, which is installed at a specific location in the water supply network, usually near the water injection wellhead or water injection layer.

[0045] like Figure 2 As shown, the automatic water injection control system includes an input layer, an execution layer, and an output layer. The execution layer is equipped with different modules. The execution layer predicts short-term and medium-to-long-term water injection schemes based on the parameters of the input layer. The output layer outputs the water injection scheme and guides the production of water injection wells, realizing automatic water injection control under green electricity supply.

[0046] The different modules in the input layer include a power generation prediction module, a power consumption matching and water injection pump scheme formulation module, a water injection scheme automatic control module, and a real-time water injection parameter acquisition and evaluation module.

[0047] In some specific embodiments, the automatic water injection control system also includes a water injection pump, water injection pipeline, water injection wellhead, and intelligent water distributor to ensure the normal operation of the automatic control system. The water injection pump is installed at or near the starting point of the water injection system, close to the water source or water supply facility. The water supply network connects the water injection pump and the water injection wellhead, responsible for delivering pressurized water to each wellhead. The wellhead is the terminal of the water injection system, responsible for injecting water into the formation. The automatic control system is installed at key nodes of the water injection system, such as near the water injection pump or wellhead. The intelligent water distributor is located at the wellhead to precisely control the amount of water entering the well. The system monitors and controls the operating status of the water injection system in real time through sensors, controllers, and actuators. At the wellhead, the automatic control system can be combined with the wellhead device to achieve precise control and adjustment of the water injection volume.

[0048] The present invention will be further explained below with reference to specific embodiments.

[0049] Example 1 Automatic water injection control method under photovoltaic power supply: The daily intermittent and fluctuating characteristics of photovoltaic power generation are significant and are greatly affected by seasons and weather. The overall water injection mode is designed as "large cycle pulse water injection + small cycle intermittent water injection", that is, in the medium and long term, pulse water injection with different injection intensities is used as a whole on an annual basis, while the daily water injection scheme adopts intermittent water injection.

[0050] The steps of the automatic water injection control method for photovoltaic power supply are as follows: (1) Predicting the medium- and long-term photovoltaic power generation of the block. First, input the photovoltaic generator parameters and historical power generation data; second, select the photovoltaic power generation prediction calculation model suitable for the block; then, collect and input dynamic change indicators such as meteorological and environmental conditions in real time, such as radiation intensity, ambient temperature, and relative humidity; finally, automatically execute the program to complete the photovoltaic power generation prediction.

[0051] (2) Design of water injection power consumption and water injection station output discharge scheme. Based on the overall planning of the block development power consumption and the predicted photovoltaic power generation, determine the proportion of water injection power consumption in the medium and long term and the short term; then, determine the medium and long term and short term operating schemes for the water injection pumps, including output discharge and operating time. The water injection pumps should have automatic adjustment functions to automatically execute the above schemes.

[0052] (3) Automatic control of single-well water injection scheme. Considering the intermittent characteristics of photovoltaic power generation, seasonal fluctuation characteristics, and weather change patterns, the medium- and long-term water injection scheme adopts pulse water injection on an annual basis; the daily water injection scheme adopts intermittent water injection, completing the daily injection volume during the photovoltaic power generation period and stopping injection during the photovoltaic power generation period. Intelligent water injection technology is adopted to automatically adjust the flow rate to implement the daily water injection scheme, and a stable flow rate is used to avoid damaging the reservoir.

[0053] (4) Real-time water injection parameter recording and evaluation. Intermittent water injection is used under photovoltaic power supply, and the formation pressure is in an unstable stage. A real-time water injection parameter recording module is set up, including instantaneous water injection volume, nozzle opening, pressure before and after the nozzle, etc., to monitor the completion of water injection and changes in formation flowing pressure throughout the process. The water injection development effect is evaluated in real time, including but not limited to evaluation of changes in water absorption capacity, changes in formation physical properties, and development effect. The water injection scheme is dynamically adjusted in a timely manner to ensure the effectiveness of water injection development under photovoltaic power supply.

[0054] Example 2 Automatic water injection control method under wind power supply: The power output curve of wind power generation is more continuous and has no daily intermittent characteristics, but its daily and seasonal fluctuations are significant. The overall water injection mode is designed as "large-cycle pulse water injection + small-cycle pulse water injection", that is, pulse water injection is used in the medium and long term on an annual basis, and pulse water injection is also used in the daily water injection scheme.

[0055] The steps for automatic water injection control in wind power supply are basically the same as those for photovoltaic power supply. The following only discusses the steps where there are differences: (1) Predict the medium- and long-term and short-term wind power generation in the block. First, input the wind turbine parameters and historical power generation data; second, select the wind power generation prediction calculation model suitable for the block; then, collect and input meteorological and environmental dynamic change indicators in real time, such as wind speed, wind direction, and air pressure; finally, automatically execute the program to complete the wind power generation prediction.

[0056] (2) Automatic control of single-well water injection scheme. Considering the daily and seasonal fluctuations of wind power generation and the overall more continuous energy supply characteristics, the medium- and long-term water injection scheme adopts pulse water injection as a whole. The maximum injection rate that the formation can withstand should be determined on an annual basis. The daily water injection scheme also adopts pulse water injection, with high water injection intensity during peak wind power output and low water injection intensity during off-peak wind power output. Intelligent water injection technology is adopted to automatically adjust the flow rate to implement the water injection scheme for different time periods, and constant water volume injection is adopted to avoid damaging the reservoir.

[0057] This invention, while ensuring the effectiveness of water-driven development and without damaging the reservoir, establishes a water injection control method that efficiently matches the green electricity generation efficiency through an automatic water injection control system. This improves the self-consumption of green electricity, effectively reduces wind and solar curtailment rates, reduces energy waste, and effectively solves the problems of insufficient green electricity generation and local over-generation that occur in conventional water injection modes.

[0058] Compared with the prior art, the present invention has the following advantages: 1. To ensure optimal water-drive development without damaging the reservoir, a highly coordinated water injection control strategy was designed, integrating green energy generation efficiency with water injection operation requirements. This system achieves precise matching between water injection rate and green energy output efficiency by real-time monitoring of green energy generation status and the dynamic needs of injection wells, greatly promoting the self-generation and local consumption of green energy.

[0059] 2. This system can intelligently adjust water injection parameters to adapt to fluctuations in green electricity supply, effectively alleviating the common problem in traditional water injection models where "water injection demand is difficult to meet during off-peak hours, while a surplus of green electricity during peak hours leads to wind and solar curtailment." Through this efficient matching and flexible regulation, this invention not only significantly reduces wind and solar curtailment rates and minimizes the waste of valuable clean energy, but also further improves energy utilization efficiency, providing strong technical support for achieving a green, low-carbon, and sustainable energy utilization model.

[0060] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for automatically regulating water injection powered by green electricity, characterized in that, Includes the following steps: S1. Predict the green energy power generation capacity of the block based on generator set parameters, meteorological parameters and environmental parameters; S2. Determine the proportion of electricity used for water injection based on the power generation capacity of the block, and determine the working scheme of the water injection pump; S3. Execute the water injection pump operation plan, monitor real-time water injection parameters and make dynamic adjustments.

2. The automatic water injection control method under green electricity supply according to claim 1, characterized in that, The generator set parameters include factors affecting green electricity generation power, and the water injection parameters include water injection pump parameters, injection-production relationship, and oil-water well parameters.

3. The automatic water injection control method under green electricity supply according to claim 1, characterized in that, In step S1, the predicted block power generation includes: Power generation is predicted based on equipment operating parameters and a power generation prediction calculation model.

4. The automatic water injection control method under green electricity supply according to claim 1, characterized in that, The meteorological parameters include one or more of the following: ambient temperature, relative humidity, wind speed, wind direction, and air pressure. The environmental parameters include radiation intensity.

5. The automatic water injection control method under green electricity supply according to claim 1, characterized in that, The determination of the water injection pump's operating plan includes determining the pump's output displacement and operating time.

6. The automatic water injection control method under green electricity supply according to claim 1, characterized in that, The real-time water injection parameters include one or more of the following: instantaneous water injection volume, nozzle opening, pressure before nozzle, and pressure after nozzle.

7. The automatic water injection control method under green electricity supply according to claim 1, characterized in that, The control method further includes implementing a water injection scheme, which includes pulsed water injection and / or intermittent water injection.

8. The automatic water injection control method under green electricity supply according to claim 1, characterized in that, The control method also includes evaluating the water drive effect based on the real-time water injection parameters. The water drive effect evaluation includes one or more of the following: water injection qualification rate evaluation, water absorption capacity change evaluation, formation property change evaluation, and development effect evaluation.

9. The automatic water injection control method under green electricity supply according to claim 1, characterized in that, The water injection pump operation plan includes a short-term plan and a medium-to-long-term plan. The short-term plan includes a design plan based on hours and / or days / weeks, while the medium-to-long-term plan includes a design plan based on years.

10. An automatic water injection control system for green electricity supply, characterized in that, include: A power generation prediction module is configured to predict the power generation of a block based on generator set parameters, meteorological parameters, and environmental parameters. The power consumption matching and water injection pump scheme formulation module is configured to determine the proportion of water injection power consumption based on the power generation of the block, and to determine the working scheme of the water injection pump. The automatic water injection scheme control module is configured to execute the water injection pump working scheme, monitor the real-time water injection parameters of a single well, and perform dynamic control. as well as A real-time water injection parameter acquisition and evaluation module is configured to evaluate the water drive effect based on real-time water injection parameters.

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