A pore regulation method and device for a loose sandstone reservoir, an electronic device, and a storage medium

Abstract

This invention discloses a method, apparatus, electronic device, and storage medium for pore channel control in loose sandstone reservoirs. The method includes: constructing a pore channel development level discrimination index system based on the characteristics of the loose sandstone in the reservoir, and determining the weight vector of the pore channel development level discrimination index system; determining the pore channel development level of the loose sandstone reservoir based on the pore channel development level discrimination index system and the weight vector; determining slug injection parameters for the loose sandstone reservoir based on the pore channel development level; and injecting a fiber gel profile control agent into the loose sandstone reservoir based on the slug injection parameters to control the pore channels. This invention solves the problem of reduced chemical erosion resistance due to formation sand production by discriminating the pore channel development level of loose sandstone reservoirs and injecting a fiber gel profile control agent targeting the pore channel development level. It also overcomes the weaknesses of single, general injection methods, achieving a tailored approach for each reservoir and well, thereby improving the recovery rate of loose sandstone reservoirs.

Description

Technical Field

[0001] This invention relates to the field of oilfield development technology, and in particular to a method, apparatus, electronic equipment and storage medium for channel control in loose sandstone reservoirs. Background Technology

[0002] An unavoidable problem in the water injection development of loose sandstone reservoirs is formation sand production. Oil wells are in a state of long-term sand-carrying production, resulting in the widespread development of large channels between oil and water wells, ineffective circulation of injected water, and local enrichment of residual oil.

[0003] Currently, adding water-soluble polymers to the injection water to reduce water phase fluidity and improve sweep efficiency and oil displacement efficiency is a common and effective method targeting water-dominant channels. However, it is crucial to carefully assess the impact of complex reservoir properties such as salinity, temperature, and hardness on the polymer solution, and polymer cross-flow can significantly affect the enhanced oil recovery. Furthermore, with the increasing development of large channels, the weakness of single polymer solvent systems or multi-segment polymer combination systems in terms of poor erosion resistance becomes increasingly prominent, and the adaptability of chemical agents to improving the recovery of such reservoirs deteriorates. Summary of the Invention

[0004] This invention provides a method, apparatus, electronic equipment, and storage medium for channel control in loose sandstone reservoirs to solve the problem of reduced chemical erosion resistance due to sand production.

[0005] According to one aspect of the present invention, a method for pore channel control in loose sandstone reservoirs is provided, comprising:

[0006] Based on the loose sandstone characteristics of the loose sandstone reservoir, a pore development level discrimination index system was constructed, and the weight vector of the pore development level discrimination index system was determined.

[0007] The pore development level of the loose sandstone reservoir is determined based on the pore development level discrimination index system and the weight vector.

[0008] Based on the pore development level, the slug injection parameters of the loose sandstone reservoir are determined, and a fiber gel profile control agent is injected into the loose sandstone reservoir based on the slug injection parameters to regulate the pores.

[0009] According to another aspect of the present invention, a pore channel control device for loose sandstone reservoirs is provided, comprising:

[0010] The discrimination index system construction module is used to construct a pore development level discrimination index system based on the loose sandstone characteristics of the loose sandstone reservoir, and to determine the weight vector of the pore development level discrimination index system.

[0011] The pore development level determination module is used to determine the pore development level of loose sandstone reservoirs based on the pore development level discrimination index system and the weight vector.

[0012] The pore channel control module is used to determine the slug injection parameters of the loose sandstone reservoir based on the pore channel development level, and inject a fiber gel profile control agent into the loose sandstone reservoir based on the slug injection parameters to control the pore channel.

[0013] The technical solution of this invention involves constructing a pore development level discrimination index system based on the characteristics of loose sandstone reservoirs and determining the weight vector of the pore development level discrimination index system; determining the pore development level of the loose sandstone reservoir based on the pore development level discrimination index system and the weight vector; determining the slug injection parameters of the loose sandstone reservoir based on the pore development level; and injecting a fiber gel profile control agent into the loose sandstone reservoir based on the slug injection parameters to regulate the pores. By discriminating the pore development level of loose sandstone reservoirs and injecting fiber gel profile control agents according to the pore development level, the problem of reduced chemical erosion resistance due to formation sand production is solved, the weakness of a single, general injection method is changed, and a strategy and method are implemented for each reservoir and each well, thereby improving the recovery rate of loose sandstone reservoirs.

[0014] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of a pore channel control method for a loose sandstone reservoir provided in Embodiment 1 of the present invention;

[0017] Figure 2 This is a diagram illustrating the fiber gel sand-fixing mechanism provided in Embodiment 1 of the present invention, as shown below. Figure 2 As shown;

[0018] Figure 3 This is a schematic diagram of the fiber gel blockage regulation mechanism provided in Embodiment 1 of the present invention;

[0019] Figure 4 This is a schematic diagram of an experimental procedure for a fiber gel system provided in Embodiment 1 of the present invention;

[0020] Figure 5 This is a schematic diagram of the pore channel control device for a loose sandstone oil reservoir provided in Embodiment 2 of the present invention;

[0021] Figure 6 This is a schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] Example 1

[0025] Figure 1 This is a flowchart of a pore channel control method for loose sandstone reservoirs provided in Embodiment 1 of the present invention. This embodiment is applicable to the control of pore channels in loose sandstone reservoirs. The method can be executed by a pore channel control device for loose sandstone reservoirs. This pore channel control device can be implemented in hardware and / or software and can be configured in electronic devices such as computers and servers. Figure 1 As shown, the method includes:

[0026] S110. Based on the loose sandstone characteristics of the loose sandstone reservoir, construct a pore development level discrimination index system and determine the weight vector of the pore development level discrimination index system.

[0027] The characteristics of loose sandstone are mainly reflected in its geological structure and physical properties. These characteristics have an important impact on the development and recovery rate of oil reservoirs. Specifically, the characteristics of loose sandstone include loose geological structure, high permeability, and heterogeneity.

[0028] In this embodiment, a pore development level discrimination index system is constructed based on the characteristics of loose sandstone reservoirs. This system includes multiple discrimination indicators to determine the development level of the pores. Specifically, the system comprises dynamic and static indicators. Dynamic indicators include one or more of the following: water cut increase rate, sand production, dimensionless cumulative fluid production intensity, well group cumulative water-oil ratio difference, and dimensionless cumulative water injection intensity. The water cut increase rate reflects the rate of increase in water content in the produced water of oil wells and is an important indicator for evaluating reservoir development effectiveness. Sand production rate indicates the amount of sand produced during oil well production and is closely related to pore stability and sand production issues. Dimensionless cumulative fluid production intensity measures the fluid production capacity per unit thickness of reservoir, reflecting the impact of production intensity on pore development. The cumulative water-oil ratio difference within a well group indicates the degree of difference in water-oil ratio among different wells within the group, reflecting the non-uniformity of fluid flow within the reservoir. Dimensionless cumulative water injection intensity measures the water injection capacity per unit thickness of reservoir and is related to the distribution of injected water and pore development. Static indicators include one or more of the following: permeability gradient, cementation degree, and clay content. Permeability gradient reflects the degree of difference in permeability in different parts of the reservoir and is an important indicator for evaluating reservoir heterogeneity. Cementation degree indicates the cementation strength between sandstone particles, affecting reservoir stability and pore development. Clay content: The presence of clay may affect reservoir permeability and pore structure.

[0029] Furthermore, a preset weighting method can be used to determine the weight vector of the pore development level discrimination index system. This preset weighting method includes, but is not limited to, the analytic hierarchy process (AHP) and principal component analysis (PCA), etc., and is not limited here. The weight vector includes the weight value of each index in the pore development level discrimination index system.

[0030] Based on the above embodiments, optionally, determining the weight vector of the pore development level discrimination index system includes: constructing a dynamic judgment matrix based on the relative importance scale values ​​between the dynamic indicators; constructing a static judgment matrix based on the relative importance scale values ​​between the static indicators; and determining the weight vector of the pore development level discrimination index system based on the dynamic judgment matrix and the static judgment matrix.

[0031] In this embodiment, a relative importance scale value is determined between dynamic indicators, and a dynamic judgment matrix is ​​constructed using this scale value. Each element of the dynamic judgment matrix represents the relative importance between two dynamic indicators. For example, the method for determining the relative importance scale value between dynamic indicators can be a 1-9 scale method. For instance, if indicator A is slightly more important than indicator B, the scale value of A to B might be 3. Simultaneously, the scale value of B to A would be 1 / 3, to maintain the reciprocity of the judgment matrix.

[0032] For example, the dynamic judgment matrix is ​​shown in Table 1:

[0033] Table 1

[0034] Penetration level difference Degree of bonding mud content Weight Penetration level difference 1 1 / 2 2 0.286 Degree of bonding 2 1 4 0.571 mud content 1 / 2 1 / 4 1 0.143

[0035] Similarly, determine the relative importance scale values ​​between static indicators, and use the relative importance scale values ​​to construct a static judgment matrix.

[0036] For example, the static judgment matrix is ​​shown in Table 2:

[0037] Table 2

[0038]

[0039] Furthermore, for the dynamic judgment matrix and the static judgment matrix, the eigenvector corresponding to the largest eigenvalue in the dynamic judgment matrix and the static judgment matrix are solved, and the eigenvector is normalized to obtain the weight vector of the pore development level discrimination index system.

[0040] For example, the weights of each indicator in the weight vector of the pore development level discrimination index system are shown in Table 3:

[0041] Table 3

[0042]

[0043] S120. Determine the pore development level of the loose sandstone reservoir based on the pore development level discrimination index system and the weight vector.

[0044] In this embodiment, the discrimination results of pores in loose sandstone reservoirs can be determined based on the weight vector and the data of each discrimination index in the pore development level discrimination index system. The pore development level of the loose sandstone reservoir is then determined based on the discrimination results. The discrimination result represents the severity of pore development, and the pore development level of the loose sandstone reservoir can be determined according to the severity of pore development. Pore development levels include one or more of the following: natural pores, developing pores, and complete pores. The severity of pore development increases sequentially from natural to developing to complete pores. Natural large pores have slightly increased permeability and can be considered as channels with high permeability. Their characteristic is that the fluid seepage capacity is enhanced, but still within the applicable range of Darcy's law. Compared to natural large pores, developing large pores have significantly enhanced fluid seepage capacity. Although the seepage capacity is enhanced, it still does not completely escape the applicable range of Darcy's law. The development degree of this type of pore is further aggravated, having a more significant impact on the reservoir development effect. In fully developed macropores, the fluid flow no longer follows Darcy's law but exhibits pipe flow characteristics. This represents the most severe level of macropore development, significantly impacting reservoir development and requiring more effective control measures.

[0045] Based on the above embodiments, optionally, determining the pore development level of a loose sandstone reservoir based on the pore development level discrimination index system and the weight vector includes: obtaining the observed value of each index in the pore development level discrimination index system, and determining the cumulative distribution probability of each index based on the observed value; determining the boundary of the membership function value of each index based on the cumulative distribution probability; constructing a membership matrix based on the observed value of each index in the pore development level discrimination index system, the preset membership function, and the boundary of the membership function value; performing a merging operation on the membership matrix and the weight vector based on the composite factor to obtain the evaluation result of the pore development level of the loose sandstone reservoir; and determining the pore development level of the loose sandstone reservoir based on the evaluation result of the pore development level of the loose sandstone reservoir.

[0046] In this embodiment, the observed values ​​of each indicator in the pore development level discrimination index system are obtained. It is understood that the observed values ​​typically originate from actual reservoir monitoring data, geological exploration data, and historical production data. Furthermore, the cumulative distribution probability of each indicator is calculated based on the observed values. The cumulative distribution probability reflects the relative position of the observed value in the overall data, i.e., the proportion of samples less than or equal to that observed value out of the total sample size. Further, the boundary of the membership function value for each indicator is determined based on the cumulative distribution probability. The boundary of the membership function value maps the observed value to the corresponding membership function value, thereby reflecting the degree of membership of the observed value to different pore development levels. The boundary of the membership function value is typically set based on expert experience, historical data, and actual needs.

[0047] For example, the limits of the membership function values ​​for each index are shown in Table 4:

[0048] Table 4

[0049]

[0050] Furthermore, based on the observed values, preset membership functions, and the limits of membership function values ​​for each indicator in the pore development level discrimination index system, a membership matrix is ​​constructed. A composite factor is used to merge the membership matrix and weight vector to obtain the evaluation results of the pore development level of the loose sandstone reservoir. Based on the maximum membership value or a set threshold condition in the evaluation results of the pore development level of the loose sandstone reservoir, the pore development level of the loose sandstone reservoir is determined. Here, the elements in the membership matrix represent the membership degree of the observed value for different pore development levels.

[0051] S130. Determine the slug injection parameters of the loose sandstone reservoir based on the pore development level, and inject a fiber gel profile control agent into the loose sandstone reservoir based on the slug injection parameters to regulate the pores.

[0052] It should be noted that, Figure 2 This is a diagram illustrating the fiber gel sand-fixing mechanism provided in Embodiment 1 of the present invention, as shown below. Figure 2 As shown, polymer gels cannot solidify gravel, while fiber powder can. Therefore, after being injected into the reservoir, fiber gel can interact with the sand grains in the formation to form a stable solidified structure, preventing the sand grains from flowing with the fluid and thus reducing formation sand production. Through a plugging mechanism, fiber gel can effectively block large pores with high permeability, reduce ineffective water circulation, and improve reservoir recovery. Furthermore, Figure 3 This is a schematic diagram of the fiber gel blockage regulation mechanism provided in Embodiment 1 of the present invention, as shown below. Figure 3As shown, fiber gel can penetrate large, high-permeability channels and form gel blockages within them, altering the fluid flow path and forcing the fluid to redirect towards low-permeability areas, thereby improving sweep efficiency and oil displacement efficiency. Through this blocking mechanism, fiber gel can effectively seal large, high-permeability channels, reduce ineffective water circulation, and improve reservoir recovery.

[0053] The slug injection parameters include, but are not limited to, injection rate, injection pressure, injection volume, and injection concentration. Specifically, the slug injection parameters for three levels of large-channel slugs can be optimized through laboratory experiments. For example, Figure 4 This is a schematic diagram of an experimental procedure for a fiber gel system provided in Embodiment 1 of the present invention, as shown below. Figure 4 As shown, permeability-filled sand cores for the target reservoir were prepared, and an orthogonal experimental design method was used to design experimental combinations (fiber concentration, injection rate, and injection volume). The experimental steps were as follows: waterflooding was used to determine permeability; the flow modifier was injected according to the corresponding designed injection parameters, and the inlet and friction pressures were recorded. After injecting a certain amount of slug, the sand-filled tube was placed in a constant temperature chamber until gelation and solidification; subsequent waterflooding was performed, and the plugging rate and residual resistance coefficient were calculated. Finally, the injection parameters were optimized based on the experimental data. The optimized injection parameters can be: natural macroporous type, with injection parameters of 30nm fiber gel, injection concentration of 0.2%, injection rate of 5ml / min, and injection volume of 0.5PV; developing macroporous type, with injection parameters of 80nm fiber gel, injection concentration of 0.1-0.2%, injection rate of 5ml / min, and injection volume of 0.5PV; and fully developed macroporous type, with injection parameters of 80nm fiber gel, injection concentration of 0.5%, injection rate of 5ml / min, and injection volume of 0.3PV.

[0054] In some embodiments, injection parameters can be optimized through laboratory experiments under different combinations of natural, developing, and fully-formed large-pore structures. Specifically, sand-filled core samples for the target reservoir permeability are prepared. The experimental steps are as follows: pre-waterflooding is performed, and the flow split rate of different sand-filled tubes is calculated; a fiber gel system is injected at a constant rate, and the inlet and friction pressures are recorded; after injecting a certain amount of slugs, the sand-filled tubes are placed in a constant-temperature chamber to allow the gel to solidify; subsequent waterflooding is performed at a constant rate, and the change in flow split rate after fiber gel plugging is calculated. Through experimental optimization of slug injection parameters, a combination of 0.5% concentration 80nm + 0.2% concentration 80nm + 0.2% concentration 30nm fiber slugs can increase the flow split rate of the target layer by more than 90%, significantly improving the recovery rate.

[0055] In this embodiment, slug injection parameters for loose sandstone reservoirs are determined based on pore development level. A fiber gel profile control agent is then injected into the loose sandstone reservoir based on these parameters to regulate pore flow. The fiber gel profile control agent injection process includes a pre-protective slug, a displacement slug, and subsequent waterflooding. Specifically, the pre-protective slug is injected before the fiber gel profile control agent to isolate formation water and the profile control agent, preventing impurities in the formation water from affecting the profile control agent's performance. The protective slug also serves as a pre-sealing agent, creating favorable conditions for subsequent profile control agent injection. For example, the injection material is a 0.4% polymer solution, and the injection volume is 0.02 PV. The displacement slug is injected after the profile control agent injection to push the profile control agent to deeper reservoir areas and ensure uniform distribution of the profile control agent within the reservoir. The displacement slug also further seals and stabilizes the reservoir. For example, the injected material is a 0.7% polymer solution, and the injection volume is 0.01 PV. Subsequent waterflooding is performed after the above injection steps to continue extracting the remaining oil in the reservoir. It should be noted that during waterflooding, changes in water cut need to be closely monitored, and waterflooding should be stopped when the water cut reaches 98%.

[0056] Based on the above embodiments, optionally, the fiber gel profile control agent includes a fiber solution, a polymer solution, and a crosslinking agent. Specifically, the fiber system can be prepared using injection water from the target reservoir. A 0.2% fiber solution is prepared using cellulose with a diameter of 30±5μm and a length of 100-1000μm, and a 0.15% polymer solution is prepared using injection water from the target reservoir. The crosslinking agent can be 0.1% chromium trichloride. By introducing ultra-short hydrophobic fibers, the coiled, curved fibers are easily captured and entangled by the rock skeleton after entering the large pores, consolidating loose sand, blocking high-permeability pores, and achieving fluid flow diversion. Furthermore, the use of plant fibers is green and environmentally friendly, temperature and salt resistant, and has stable physicochemical properties, solving the problem of improving oil recovery under the inherent conditions of sand production and large pore development in loose sandstone reservoirs.

[0057] The technical solution of this embodiment constructs a pore development level discrimination index system based on the characteristics of loose sandstone reservoirs and determines the weight vector of the pore development level discrimination index system; determines the pore development level of loose sandstone reservoirs based on the pore development level discrimination index system and the weight vector; determines the slug injection parameters of loose sandstone reservoirs based on the pore development level; and injects a fiber gel profile control agent into loose sandstone reservoirs based on the slug injection parameters to regulate the pores. By discriminating the pore development level of loose sandstone reservoirs and injecting fiber gel profile control agents according to the pore development level, the problem of reduced chemical erosion resistance due to formation sand production is solved, the weakness of single and general injection methods is changed, and a strategy and method are implemented for each reservoir and each well, thereby improving the recovery rate of loose sandstone reservoirs.

[0058] Example 2

[0059] Figure 5 This is a schematic diagram of a pore channel control device for a loose sandstone oil reservoir provided in Embodiment 2 of the present invention. Figure 5 As shown, the device includes:

[0060] The discrimination index system construction module 210 is used to construct a pore development level discrimination index system based on the loose sandstone characteristics of the loose sandstone reservoir, and to determine the weight vector of the pore development level discrimination index system.

[0061] The pore development level determination module 220 is used to determine the pore development level of the loose sandstone reservoir based on the pore development level discrimination index system and the weight vector.

[0062] The pore channel control module 230 is used to determine the slug injection parameters of the loose sandstone reservoir based on the pore channel development level, and inject a fiber gel profile control agent into the loose sandstone reservoir based on the slug injection parameters to control the pore channel.

[0063] The technical solution of this embodiment constructs a pore development level discrimination index system based on the characteristics of loose sandstone reservoirs and determines the weight vector of the pore development level discrimination index system; determines the pore development level of loose sandstone reservoirs based on the pore development level discrimination index system and the weight vector; determines the slug injection parameters of loose sandstone reservoirs based on the pore development level; and injects a fiber gel profile control agent into loose sandstone reservoirs based on the slug injection parameters to regulate the pores. By discriminating the pore development level of loose sandstone reservoirs and injecting fiber gel profile control agents according to the pore development level, the problem of reduced chemical erosion resistance due to formation sand production is solved, the weakness of single and general injection methods is changed, and a strategy and method are implemented for each reservoir and each well, thereby improving the recovery rate of loose sandstone reservoirs.

[0064] Based on the above embodiments, optionally, the pore development level discrimination index system includes dynamic indicators and static indicators. The dynamic indicators include one or more of the following: water cut increase rate, sand production, dimensionless cumulative fluid production intensity, well group cumulative water-oil ratio difference, and dimensionless cumulative water injection intensity. The static indicators include one or more of the following: permeability difference, cementation degree, and clay content.

[0065] Based on the above embodiments, optionally, the pore development level includes one or more of the following: natural pore, developing pore, and complete pore.

[0066] Based on the above embodiments, optionally, the discrimination index system construction module 210 includes a weight vector determination module, used to construct a dynamic judgment matrix based on the relative importance scale values ​​between the dynamic indicators; construct a static judgment matrix based on the relative importance scale values ​​between the static indicators; and determine the weight vector of the pore development level discrimination index system based on the dynamic judgment matrix and the static judgment matrix.

[0067] Based on the above embodiments, optionally, the pore development level determination module 220 is specifically used to obtain the observed value of each indicator in the pore development level discrimination index system, and determine the cumulative distribution probability of each indicator based on the observed value; determine the boundary of the membership function value of each indicator based on the cumulative distribution probability; construct a membership matrix based on the observed value of each indicator in the pore development level discrimination index system, the preset membership function, and the boundary of the membership function value; perform a merging operation on the membership matrix and the weight vector based on the synthetic factor to obtain the evaluation result of the pore development level of the loose sandstone reservoir; and determine the pore development level of the loose sandstone reservoir based on the evaluation result of the pore development level of the loose sandstone reservoir.

[0068] Based on the above embodiments, optionally, the injection process of the fiber gel profile control agent may further include a pre-protective slug, a replacement slug, and subsequent water flooding.

[0069] Based on the above embodiments, optionally, the fiber gel profile modifier includes a fiber solution polymer solution and a crosslinking agent.

[0070] The pore channel control device for loose sandstone reservoirs provided in this embodiment of the invention can execute the pore channel control method for loose sandstone reservoirs provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0071] Example 3

[0072] Figure 6 This is a schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present invention. The electronic device 10 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 may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, 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 illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0073] like Figure 6As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0074] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0075] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as pore control methods in loose sandstone reservoirs.

[0076] In some embodiments, the pore control method for loose sandstone reservoirs can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the pore control method for loose sandstone reservoirs described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the pore control method for loose sandstone reservoirs by any other suitable means (e.g., by means of firmware).

[0077] Various embodiments of the systems and techniques described above 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), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0078] Computer programs for implementing the pore control method for loose sandstone reservoirs of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer programs can be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0079] Example 4

[0080] Embodiment 4 of the present invention also provides a computer-readable storage medium storing computer instructions for causing a processor to execute a pore control method for a loose sandstone reservoir, the method comprising:

[0081] Based on the characteristics of loose sandstone reservoirs, a pore development level discrimination index system was constructed, and the weight vector of the pore development level discrimination index system was determined.

[0082] The pore development level of loose sandstone reservoirs is determined based on the pore development level discrimination index system and weight vector.

[0083] Based on the pore development level, the slug injection parameters for loose sandstone reservoirs are determined, and based on the slug injection parameters, a fiber gel profile control agent is injected into the loose sandstone reservoirs to regulate the pores.

[0084] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0085] 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 provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, 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 sound input, voice input, or tactile input).

[0086] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0087] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0088] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0089] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for pore channel control in loose sandstone reservoirs, characterized in that, include: Based on the loose sandstone characteristics of the loose sandstone reservoir, a pore development level discrimination index system was constructed, and the weight vector of the pore development level discrimination index system was determined. The pore development level of the loose sandstone reservoir is determined based on the pore development level discrimination index system and the weight vector. Based on the pore development level, the slug injection parameters of the loose sandstone reservoir are determined, and a fiber gel profile control agent is injected into the loose sandstone reservoir based on the slug injection parameters to regulate the pores.

2. The method according to claim 1, characterized in that, The pore development level discrimination index system includes dynamic and static indicators. The dynamic indicators include one or more of the following: water cut increase rate, sand production, dimensionless cumulative fluid production intensity, well group cumulative water-oil ratio difference, and dimensionless cumulative water injection intensity. The static indicators include one or more of the following: permeability difference, degree of cementation, and clay content.

3. The method according to claim 1, characterized in that, The pore development level includes one or more of the following: natural pore, developing pore, and complete pore.

4. The method according to claim 2, characterized in that, The weight vector for determining the pore development level discrimination index system includes: A dynamic judgment matrix is ​​constructed based on the relative importance scale values ​​among the dynamic indicators; A static judgment matrix is ​​constructed based on the relative importance scale values ​​among the static indicators; The weight vector of the pore development level discrimination index system is determined based on the dynamic judgment matrix and the static judgment matrix.

5. The method according to claim 1, characterized in that, The determination of the pore development level of a loose sandstone reservoir based on the pore development level discrimination index system and the weight vector includes: Obtain the observed value of each index in the channel development level discrimination index system, and determine the cumulative distribution probability of each index based on the observed value; The limits of the membership function values ​​for each index are determined based on the cumulative distribution probability. A membership matrix is ​​constructed based on the observed value of each indicator in the channel development level discrimination index system, the preset membership function, and the boundary of the membership function value. The membership matrix and weight vector are merged based on the synthetic factor to obtain the evaluation result of the pore development level of the loose sandstone reservoir. The pore development level of the loose sandstone reservoir is determined based on the evaluation results of the pore development level of the reservoir.

6. The method according to claim 1, characterized in that, The injection process of the fiber gel profile control agent also includes a pre-protection slug, a displacement slug, and subsequent water flooding.

7. The method according to claim 1, characterized in that, The fiber gel profile modifier comprises a fiber solution polymer solution and a crosslinking agent.

8. A pore flow control device for loose sandstone oil reservoirs, characterized in that, include: The discrimination index system construction module is used to construct a pore development level discrimination index system based on the loose sandstone characteristics of the loose sandstone reservoir, and to determine the weight vector of the pore development level discrimination index system. The pore development level determination module is used to determine the pore development level of loose sandstone reservoirs based on the pore development level discrimination index system and the weight vector. The pore channel control module is used to determine the slug injection parameters of the loose sandstone reservoir based on the pore channel development level, and inject a fiber gel profile control agent into the loose sandstone reservoir based on the slug injection parameters to control the pore channel.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the method of any one of claims 1-7.

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