Foam liquid oil displacement method and device under pulse liquid phase discharge effect

Abstract

The invention discloses a foam liquid oil displacement method and device under the action of pulse liquid phase discharge. The method comprises the steps that according to the core, formation water and crude oil properties of a target oil reservoir, foam liquid matched with the target oil reservoir and used for foam flooding is determined; injecting the foam liquid into a water injection well of the target oil reservoir; and a pulse liquid phase discharge effect is applied to the target oil reservoir, and oil displacement is conducted on the target oil reservoir based on the pulse liquid phase discharge effect. By the adoption of the technical scheme, when oil displacement is conducted through foam liquid, pulse liquid phase discharge and the foam liquid oil displacement technology are applied in a combined mode, and the recovery rate of foam liquid displacement is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield development, in particular to a foam liquid oil displacement method and device under the action of pulsed liquid phase discharge. Background Art

[0002] my country is extremely short of oil resources. In recent years, domestic crude oil production has been only about 200 million tons, and the country's dependence on foreign crude oil has long exceeded 70%, seriously affecting my country's energy security. Therefore, how to maintain "stable production and increased production" has been a long-term problem faced by domestic oil companies.

[0003] At present, improving oil field recovery rate by implementing pulsed liquid discharge on oil fields has become a research hotspot in the field of oil and gas blockage removal and production increase. Although pulsed liquid discharge and foam liquid can both improve recovery rate, there is still no oil displacement technology that combines pulsed liquid discharge and foam liquid. Summary of the Invention

[0004] The present invention provides a foam liquid oil displacement method and device under the action of pulse liquid phase discharge, so as to solve the problem of low recovery rate during foam liquid oil displacement.

[0005] According to one aspect of the present invention, a foam liquid flooding method under pulsed liquid phase discharge is provided, the method comprising:

[0006] Determine the foam fluid for foam flooding that matches the target reservoir based on the core, formation water, and crude oil properties of the target reservoir;

[0007] injecting the foam solution into the water injection well of the target reservoir;

[0008] A pulsed liquid phase discharge effect is applied to a target oil reservoir, and oil is displaced from the target oil reservoir based on the pulsed liquid phase discharge effect.

[0009] According to another aspect of the present invention, there is provided a foam liquid flooding device under the action of pulsed liquid phase discharge, the device comprising:

[0010] The foam fluid generation module is used to determine the foam fluid for foam flooding that matches the target reservoir based on the core, formation water and crude oil properties of the target reservoir;

[0011] A foam liquid injection module is used to inject foam liquid into the water injection well of the target oil reservoir;

[0012] The oil reservoir flooding module is used to apply pulse liquid phase discharge to the target oil reservoir and flood the target oil reservoir based on the pulse liquid phase discharge.

[0013] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0014] at least one processor; and

[0015] a memory communicatively connected to at least one processor; wherein,

[0016] The memory stores a computer program executable by at least one processor. The computer program is executed by at least one processor so that the at least one processor can execute the foam liquid flooding method under the action of pulsed liquid phase discharge according to any embodiment of the present invention.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided, which stores computer instructions for enabling a processor to implement the foam liquid oil displacement method under the action of pulsed liquid phase discharge according to any embodiment of the present invention when executed.

[0018] The technical solution of the embodiment of the present invention determines a foam liquid for foam flooding that matches the target oil reservoir based on the core, formation water and crude oil properties of the target oil reservoir; injects the foam liquid into the water injection well of the target oil reservoir; applies a pulsed liquid phase discharge effect to the target oil reservoir, and floods the target oil reservoir based on the pulsed liquid phase discharge effect, so that when the foam liquid is used for flooding, the recovery rate of the foam liquid flooding is improved by combining the pulsed liquid phase discharge with the foam liquid flooding technology.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a flow chart of a foam liquid flooding method under pulsed liquid phase discharge according to the first embodiment of the present invention;

[0022] Figure 2 This is a schematic structural diagram of a foam liquid flooding device under pulsed liquid phase discharge according to a second embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of an electronic device for implementing the foam liquid oil displacement method under the action of pulsed liquid phase discharge according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] Example 1

[0027] Figure 1 A flow chart of a foam liquid flooding method under the action of pulsed liquid phase discharge is provided for the first embodiment of the present invention. This embodiment is applicable to the case where the recovery rate is low when flooding with foam liquid. The method can be performed by a foam liquid flooding device under the action of pulsed liquid phase discharge. The foam liquid flooding device under the action of pulsed liquid phase discharge can be implemented in the form of hardware and / or software. The foam liquid flooding device under the action of pulsed liquid phase discharge can be configured in an electronic device with data processing capabilities. Figure 1 As shown, the method includes:

[0028] S110. Determine a foam fluid for foam flooding that matches the target oil reservoir based on the core, formation water, and crude oil properties of the target oil reservoir.

[0029] The target reservoir may be the reservoir to be flooded. The crude oil properties may be the properties of the crude oil in the target reservoir, including but not limited to color, density, viscosity, chemical composition, and impurity content.

[0030] The core, crude oil properties and formation water of the target oil reservoir are obtained, and according to the existing foam liquid flooding method, corresponding foam liquid for foam liquid flooding is generated, and the foam liquid is mixed with the formation water to obtain a foam liquid mixed solution.

[0031] S120: Injecting the foam liquid into the water injection well of the target oil reservoir.

[0032] A water injection well may be a well that injects water into a target oil reservoir.

[0033] The foam liquid mixed solution is injected into the water injection well of the target oil reservoir through high-pressure pumps and other equipment to drive oil from the target oil reservoir.

[0034] S130: Applying a pulsed liquid phase discharge effect to the target oil reservoir, and displacing oil from the target oil reservoir based on the pulsed liquid phase discharge effect.

[0035] Before flooding the target reservoir, a pulsed liquid phase discharge is applied to the target reservoir, so that when flooding the target reservoir, the characteristics of multi-physical fields can be used to improve the oil recovery rate, thereby achieving the effect of improving the oil recovery rate of foam liquid flooding.

[0036] In an optional solution, flooding a target reservoir based on pulsed liquid discharge may include steps A1-A2:

[0037] Step A1: Determine the recovery factor of the target oil reservoir based on the oil displacement products obtained by oil displacement.

[0038] Step A2: If the increase in the recovery rate within the preset time is less than the preset increment, adjust the action parameters of the pulse liquid phase discharge action until the increase is greater than or equal to the preset increment.

[0039] During flooding, the recovery factor of the target reservoir is calculated based on the displacement products obtained. If the recovery factor increases less than the preset increment within a preset time, it indicates that the pulsed liquid phase discharge effect is unable to further improve the recovery factor under the current action parameters. In this case, the pulsed liquid phase discharge effect parameters will be adjusted until the increase is greater than or equal to the preset increment, thereby ensuring the recovery factor is improved.

[0040] Optionally, after adjusting the action parameters of the pulse liquid phase discharge action, the method further includes:

[0041] If the increase in recovery rate within the preset time is less than the preset increment and the number of adjustments of the action parameter reaches the preset adjustment condition, the adjustment of the action parameter is stopped; wherein the preset adjustment condition is determined according to the preset range of the action parameter.

[0042] The preset adjustment condition may be a maximum number of times the action parameter is adjusted, determined according to a preset range of the action parameter.

[0043] If the increase in the recovery factor within the preset time is less than the preset increment, and the number of adjustments to the action parameters reaches the preset adjustment conditions, it indicates that it is difficult to find specific action parameters within the preset range that can improve the recovery factor. At this time, in order to avoid wasting resources, the action parameters will no longer be adjusted.

[0044] Accordingly, pulsed liquid discharge is applied to the target reservoir, including:

[0045] At least a pulsed liquid phase discharge having a voltage intensity within a third preset range, a frequency within a fourth preset range, and a pulse width within a fifth preset range is applied to the target reservoir.

[0046] Turn on the high-voltage pulse power supply and other equipment to apply pulse liquid phase discharge to the target reservoir with at least a voltage intensity within the third preset range, a frequency within the fourth preset range, and a pulse width within the fifth preset range.

[0047] The present application discloses a third preset range, but does not limit it. The third preset range is 2 to 40 kV, preferably 30 kV.

[0048] This application discloses a fourth preset range, but is not limited thereto. The fourth preset range is 100 to 2000 Hz, preferably 300 Hz.

[0049] The present application discloses a fifth preset range, but does not limit it. The fifth preset range is 10 to 500 ns, preferably 120 ns.

[0050] Optionally, the starting time of application and / or the application time length of the pulse liquid phase discharge effect are the same and / or different.

[0051] According to the technical solution of the embodiment of the present invention, a foam liquid for foam flooding that matches the target oil reservoir is determined based on the core, formation water and crude oil properties of the target oil reservoir; the foam liquid is injected into the water injection well of the target oil reservoir; a pulsed liquid phase discharge effect is applied to the target oil reservoir, and oil is flooded from the target oil reservoir based on the pulsed liquid phase discharge effect, so that when the foam liquid is used for oil flooding, the recovery rate of the foam liquid flooding is improved by combining the pulsed liquid phase discharge with the foam liquid flooding technology.

[0052] Example 2

[0053] Figure 2 The present invention provides a structural block diagram of a foam liquid flooding device under the action of pulsed liquid phase discharge. This embodiment is applicable to situations where the recovery rate is low when flooding with foam liquid. The foam liquid flooding device under the action of pulsed liquid phase discharge can be implemented in the form of hardware and / or software. The foam liquid flooding device under the action of pulsed liquid phase discharge can be configured in an electronic device with data processing capabilities. Figure 2 As shown, the foam liquid flooding device under the action of pulsed liquid phase discharge in this embodiment may include: a foam liquid generation module 210, a foam liquid injection module 220 and an oil reservoir flooding module 230. Among them:

[0054] The foam liquid generation module 210 is used to determine the foam liquid for foam flooding that matches the target reservoir based on the core, formation water and crude oil properties of the target reservoir;

[0055] A foam liquid injection module 220 is used to inject foam liquid into the water injection well of the target oil reservoir;

[0056] The oil reservoir displacement module 230 is used to apply a pulsed liquid phase discharge effect to the target oil reservoir, and to perform oil displacement in the target oil reservoir based on the pulsed liquid phase discharge effect.

[0057] Based on the above embodiment, optionally, the reservoir displacement module 230 includes:

[0058] A recovery factor calculation unit is used to determine the recovery factor of the target oil reservoir based on the oil displacement products obtained by oil displacement;

[0059] The action parameter adjustment unit is used to adjust the action parameters of the pulse liquid phase discharge action if the increase in the recovery rate within the preset time is less than the preset increment, until the increase is greater than or equal to the preset increment.

[0060] Based on the above embodiment, optionally, after the action parameter adjustment unit, the device further includes:

[0061] The parameter stop adjustment unit is used to stop adjusting the action parameter if the increase in the recovery rate within the preset time is less than the preset increment and the number of adjustments to the action parameter reaches the preset adjustment condition; wherein the preset adjustment condition is determined according to the preset range of the action parameter.

[0062] Accordingly, the reservoir displacement module 230 includes:

[0063] The pulse liquid phase discharge effect applying unit is used to apply a pulse liquid phase discharge effect with a voltage intensity within a third preset range, a frequency within a fourth preset range, and a pulse width within a fifth preset range to the target reservoir.

[0064] Based on the above embodiment, optionally, the starting time of applying the pulse liquid phase discharge effect and / or the application time length are the same and / or different.

[0065] The foam liquid flooding device under pulsed liquid phase discharge provided in the embodiment of the present invention can execute the foam liquid flooding method under pulsed liquid phase discharge provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0066] Example 3

[0067] Figure 3A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0068] like Figure 3 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0069] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0070] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the foam flooding method under the action of pulsed liquid discharge.

[0071] In some embodiments, the foamed liquid flooding method under the action of pulsed liquid phase discharge can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the foamed liquid flooding method under the action of pulsed liquid phase discharge described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the foamed liquid flooding method under the action of pulsed liquid phase discharge by any other appropriate means (e.g., by means of firmware).

[0072] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0073] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0074] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0075] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0076] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0077] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0078] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0079] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A foam flooding method under pulsed liquid phase discharge, characterized in that: include: Determining a foam fluid for foam flooding that matches the target reservoir based on the core, formation water, and crude oil properties of the target reservoir; injecting the foam liquid into the water injection well of the target oil reservoir; A pulsed liquid phase discharge effect is applied to the target oil reservoir, and oil is displaced from the target oil reservoir based on the pulsed liquid phase discharge effect.

2. The method according to claim 1, characterized in that The target oil reservoir is flooded based on the pulsed liquid phase discharge, comprising: Determining the recovery factor of the target oil reservoir based on the oil displacement products obtained by oil displacement; If the increase in the recovery rate within the preset time is less than the preset increment, the action parameters of the pulse liquid phase discharge action are adjusted until the increase is greater than or equal to the preset increment.

3. The method according to claim 2, characterized in that After adjusting the action parameters of the pulsed liquid phase discharge action, the method further includes: If the increase in the recovery rate within the preset time is less than the preset increment, and the number of adjustments of the action parameter reaches the preset adjustment condition, the adjustment of the action parameter is stopped; wherein the preset adjustment condition is determined according to the preset range of the action parameter.

4. The method according to claim 1, wherein Applying a pulsed liquid phase discharge to the target reservoir includes: The pulsed liquid phase discharge action having a voltage intensity within a third preset range, a frequency within a fourth preset range, and a pulse width within a fifth preset range is applied to the target reservoir.

5. The method according to claim 1, wherein The starting point of application time and / or application time length of the pulse liquid phase discharge effect are the same and / or different.

6. A foam liquid flooding device under pulse liquid phase discharge, characterized in that: include: A foam liquid generation module is used to determine a foam liquid for foam flooding that matches the target oil reservoir based on the core, formation water and crude oil properties of the target oil reservoir; A foam liquid injection module, used for injecting the foam liquid into the water injection well of the target oil reservoir; The oil reservoir displacement module is used to apply a pulse liquid phase discharge effect to the target oil reservoir and to perform oil displacement on the target oil reservoir based on the pulse liquid phase discharge effect.

7. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the foam liquid flooding method under the action of pulsed liquid phase discharge according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the foam liquid oil displacement method under the action of pulsed liquid phase discharge according to any one of claims 1 to 5 when executed.

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