Low permeability reservoir energy enhancement method, device, computer equipment and medium

Abstract

The present application provides a method, device, computer equipment and medium for enhancing energy in low permeability reservoirs, which belongs to the field of oil and gas exploration and development. The method includes: determining the energy-enhancing medium to be injected, the injection position, the injection liquid volume and the injection displacement according to the physical parameters, rock mechanical characteristics, wellbore trajectory, fluid properties and ground stress characteristics of the reservoir; according to the injection displacement, controlling the energy-enhancing medium to be injected from the injection position through the target well until the injection liquid volume is reached; closing the target well and monitoring the wellhead pressure of the target well; in response to the wellhead pressure reaching the target pressure, outputting a volume fracturing signal, which is used to indicate a volume fracturing operation. The above technical scheme, by determining the energy-enhancing medium to be injected, the injection position, the injection liquid volume and the injection displacement according to the relevant information of the reservoir before fracturing, injecting a large amount of energy-enhancing liquid into the reservoir, and increasing the liquid sweep range, can significantly improve the development effect of the low permeability reservoir.

Description

Technical Field

[0001] The present application relates to the field of oil and gas exploration and development, and in particular to a method, device, computer equipment and medium for enhancing the energy of a low permeability reservoir. Background Art

[0002] With the deepening of oil and gas exploration and development, the proportion of low-permeability reservoirs in the newly-proven reserves has increased year by year, making the production of low-permeability reservoirs contribute more and more to the overall oil and gas production. The key technology for the economical and efficient development of low-permeability reservoirs is large-scale volume fracturing technology. However, in the development practice, the fracturing effect of low-permeability reservoirs varies greatly due to the poor physical properties of the reservoirs themselves and the low formation pressure. It is usually necessary to enhance the energy of low-permeability reservoirs in advance and then perform fracturing, which is of great significance to improving the fracturing effect of low-permeability oil fields and the development effect of oil reservoirs.

[0003] At present, the literature introduces the energy storage fracturing of the slickwater fracturing fluid system in Jilin Oilfield. The test block has low formation pressure, low recovery, low water content, and water injection development is ineffective, and the conventional fracturing effect is poor. An energy storage fracturing test was carried out in this area. During the test, the injection displacement and injection volume of the pre-fluid were increased to increase the complexity of the fractures, expand the transformation area, and increase the reservoir transformation volume; after fracturing, the well was shut down for energy storage, and the post-fracturing production showed that the production increase effect of this technology is twice that of conventional fracturing technology.

[0004] According to data research, the current low permeability reservoir energy storage fracturing technology is achieved by optimizing the amount of pre-fluid, without considering the overall reservoir, and the effect of low permeability reservoir fracturing transformation is not ideal. Summary of the invention

[0005] The embodiments of the present application provide a method, device, computer equipment and storage medium for enhancing energy of low permeability reservoirs, which can significantly improve the development effect of low permeability reservoirs. The technical solution is as follows:

[0006] In one aspect, a method for enhancing energy of a low permeability reservoir is provided, the method comprising:

[0007] Determine the energizing medium to be injected, injection location, injection fluid volume and injection displacement according to the reservoir physical parameters, rock mechanical characteristics, wellbore trajectory, fluid properties and geostress characteristics;

[0008] According to the injection displacement, controlling the energizing medium to be injected from the injection position through the target well until the injection fluid volume is reached;

[0009] Closing the target well and monitoring the wellhead pressure of the target well;

[0010] In response to the wellhead pressure reaching the target pressure, a volume fracturing signal is output, wherein the volume fracturing signal is used to indicate that a volume fracturing operation is to be performed.

[0011] In an optional implementation, the step of determining the energizing medium to be injected, the injection position, the injection fluid volume, and the injection displacement according to the reservoir physical parameters, rock mechanical characteristics, wellbore trajectory, fluid properties, and geostress characteristics includes:

[0012] Determining the injection position and the injection amount according to the physical property parameters of the reservoir;

[0013] Determining the energizing medium according to the physical property parameters;

[0014] The injection displacement is determined according to a hydraulic fracture simulation model and the energizing medium, wherein the hydraulic fracture simulation model is established based on the rock mechanics characteristics, the wellbore trajectory, the fluid properties and the geostress characteristics.

[0015] In an optional implementation, determining the injection position and the injection liquid amount according to the physical property parameters of the reservoir includes:

[0016] Establishing a reservoir geological model according to the physical property parameters of the reservoir;

[0017] Determining the injection position according to the sand body connectivity information of the reservoir geological model, wherein the sand body connectivity information is used to indicate the connectivity of the sand bodies in the reservoir;

[0018] The injection fluid volume is determined according to first simulation information of the reservoir geological model, wherein the first simulation information is used to indicate the distribution of pressure field, oil saturation field and water saturation field in the reservoir under different injection fluid volume conditions.

[0019] In an optional implementation, determining the injection position according to the sand body connectivity information of the reservoir geological model includes:

[0020] In response to the sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory is in a connected sand body, determining the injection position as the first segment;

[0021] In response to the sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory passes through at least two sand bodies, the injection position is determined to be the position segment where the sand bodies are located.

[0022] In an optional implementation, determining the energizing medium according to the physical property parameter includes:

[0023] Determining fluid characteristics and physical property characteristics of the reservoir according to the physical property parameters;

[0024] Determining the reservoir type of the reservoir according to the fluid characteristics and the physical property characteristics;

[0025] The energizing medium is determined according to the reservoir type.

[0026] In an optional implementation, determining the energizing medium according to the reservoir type includes:

[0027] In response to the reservoir type being a tight reservoir, determining the energizing medium to be active water and liquid nitrogen;

[0028] In response to the reservoir type being a heavy oil reservoir, the energizing medium is determined to be active water and liquid carbon dioxide.

[0029] In an optional implementation, determining the injection displacement according to the fracturing fracture simulation model and the energizing medium includes:

[0030] Determining second simulation information according to the fracturing fracture simulation model and the energizing medium, wherein the second simulation information is used to indicate the fracture morphology of the reservoir under different injection displacement conditions of the energizing medium;

[0031] The injection displacement is determined according to the second simulation information.

[0032] In an optional implementation, controlling the energizing medium to be injected from the injection position through the target well according to the injection displacement until the injection fluid volume is reached includes:

[0033] According to the injection displacement, the energizing medium is controlled to be injected from the injection position through the target well in a manner higher than the formation fracture pressure until the injection fluid volume is reached.

[0034] In an optional implementation, the method further includes:

[0035] During the injection of the energizing medium, real-time acquisition of fracture morphology information;

[0036] In response to the fracture morphology information indicating that the fracture morphology is single, a temporary plugging and diverting agent signal is output, wherein the temporary plugging and diverting agent signal is used to indicate the addition of a temporary plugging and diverting agent during the injection process of the energizing medium.

[0037] In another aspect, a low permeability reservoir energy enhancement device is provided, the device comprising:

[0038] A determination module is used to determine the energizing medium to be injected, the injection position, the injection fluid volume and the injection displacement according to the physical parameters of the reservoir, the rock mechanical characteristics, the wellbore trajectory, the fluid properties and the ground stress characteristics;

[0039] a control module, configured to control the energizing medium to be injected from the injection position through the target well according to the injection displacement, until the injection fluid volume is reached;

[0040] A closing module, used to close the target well and monitor the wellhead pressure of the target well;

[0041] The output module is used to output a volume fracturing signal in response to the wellhead pressure reaching a target pressure, wherein the volume fracturing signal is used to indicate a volume fracturing operation.

[0042] In an optional implementation, the determining module includes:

[0043] A first determining unit, configured to determine the injection position and the injection liquid amount according to the physical property parameters of the reservoir;

[0044] A second determining unit, configured to determine the energizing medium according to the physical property parameter;

[0045] The third determination unit is used to determine the injection displacement according to the fracturing fracture simulation model and the energizing medium, wherein the fracturing fracture simulation model is established according to the rock mechanics characteristics, the wellbore trajectory, the fluid properties and the ground stress characteristics.

[0046] In an optional implementation, the first determination unit is used to establish a reservoir geological model based on the physical parameters of the reservoir; determine the injection position based on the sand body connectivity information of the reservoir geological model, and the sand body connectivity information is used to indicate the connectivity of the sand bodies in the reservoir; determine the injection liquid volume based on the first simulation information of the reservoir geological model, and the first simulation information is used to indicate the distribution of the pressure field, oil saturation field and water saturation field in the reservoir under different injection liquid volume conditions.

[0047] In an optional implementation, the first determination unit is used to determine the injection position as the first section in response to the sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory is in a connected sand body; and to determine the injection position as the section where the sand body is located in response to the sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory passes through at least two sand bodies.

[0048] In an optional implementation, the second determination unit is used to determine the fluid characteristics and physical property characteristics of the reservoir according to the physical property parameters; determine the reservoir type of the reservoir according to the fluid characteristics and the physical property characteristics; and determine the energizing medium according to the reservoir type.

[0049] In an optional implementation, the second determination unit is used to determine that the energizing medium is activated water and liquid nitrogen in response to the reservoir type being a tight reservoir; and to determine that the energizing medium is activated water and liquid carbon dioxide in response to the reservoir type being a heavy oil reservoir.

[0050] In an optional implementation, the third determination unit is used to determine second simulation information based on the fracturing fracture simulation model and the energizing medium, wherein the second simulation information is used to indicate the fracture morphology of the reservoir under different injection displacement conditions of the energizing medium; and determine the injection displacement based on the second simulation information.

[0051] In an optional implementation, the control module is used to control the injection of the energizing medium from the injection position through the target well in a manner higher than the formation fracture pressure according to the injection displacement until the injection fluid volume is reached.

[0052] In an optional implementation, the device further includes:

[0053] An information acquisition module, used to acquire crack morphology information in real time during the injection process of the energizing medium;

[0054] The output module is further configured to output a temporary plugging and diverting agent signal in response to the fracture morphology information indicating that the fracture morphology is single, wherein the temporary plugging and diverting agent signal is configured to indicate that a temporary plugging and diverting agent is added during the injection process of the energizing medium.

[0055] On the other hand, a computer device is provided, which includes a processor and a memory, wherein the memory is used to store at least one computer program, and the at least one computer program is loaded and executed by the processor to implement the operations performed in the low permeability reservoir energization method in the embodiment of the present application.

[0056] On the other hand, a computer-readable storage medium is provided, in which at least one computer program is stored. The at least one computer program is loaded and executed by a processor to implement the operations performed in the low permeability reservoir energization method in the embodiment of the present application.

[0057] The beneficial effects of the technical solution provided by the embodiment of the present application are:

[0058] In an embodiment of the present application, a method for enhancing the energy of a low permeability reservoir is provided. The energy-enhancing medium to be injected, the injection position, the injection liquid volume, and the injection displacement are determined according to the relevant information of the reservoir before fracturing, and a large amount of energy-enhancing liquid is injected into the reservoir in a manner higher than the formation fracture pressure to increase the liquid sweep range. Then, the reservoir pressure is maintained at a high level by shutting in the well and replacing oil with water. Finally, subsequent large-scale volume fracturing is carried out in a timely manner according to the wellhead pressure, which can significantly improve the development effect of the low permeability reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0060] Figure 1 It is a schematic diagram of the implementation environment of the low permeability reservoir energy enhancement method provided in the embodiment of the present application;

[0061] Figure 2 is a flow chart of a low permeability reservoir energy enhancement method provided according to an embodiment of the present application;

[0062] Figure 3 is a block diagram of a low permeability reservoir energy enhancement device provided according to an embodiment of the present application;

[0063] Figure 4 is a structural block diagram of a terminal provided according to an embodiment of the present application;

[0064] Figure 5 It is a structural diagram of a server provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0066] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0067] The following introduces the implementation environment of the low permeability reservoir energy enhancement method provided in the embodiments of the present application. Figure 1Schematic diagram of the implementation environment of the low permeability reservoir energy enhancement method provided in the embodiment of the present application. Figure 1 , the implementation environment includes a terminal 101 and a control device 102.

[0068] The terminal 101 and the control device 102 can be directly or indirectly connected via wired or wireless communication, which is not limited in this application.

[0069] Optionally, the terminal 101 is a smart phone, a tablet computer, a laptop computer, a desktop computer, etc., but is not limited thereto. Optionally, the terminal 101 can determine the energizing medium to be injected, the injection position, the injection fluid volume, and the injection displacement according to the physical parameters, fluid properties, and geostress characteristics of the reservoir, and then control the energizing medium corresponding to the injection fluid volume to be injected from the injection position to the target well through the control device 102 according to the injection displacement, and then close the target well and monitor the wellhead pressure of the target well. Finally, in response to the wellhead pressure reaching the target pressure, a volume fracturing signal is output, and the volume fracturing signal is used to indicate a volume fracturing operation.

[0070] In the embodiment of the present application, before the large-scale volume transformation of the low permeability reservoir oil well, the reservoir is first injected with an energy-enhancing medium, and then the well is shut down, and the oil and water are replaced to increase the formation pressure to maintain a level, and then the volume transformation is performed, which can effectively improve the fracturing transformation effect of the low permeability reservoir. Among them, the low permeability reservoir development adopts the horizontal well volume fracturing process technology.

[0071] Figure 2 is a flow chart of a low permeability reservoir energy enhancement method provided according to an embodiment of the present application, such as Figure 2 As shown, in the embodiment of the present application, the computer device is implemented as a terminal as an example for explanation. The low permeability reservoir energy enhancement method includes the following steps:

[0072] 201. The terminal determines the injection position and injection volume based on the physical parameters of the reservoir.

[0073] In an embodiment of the present application, the terminal can obtain the physical property parameters of the reservoir, and then establish a reservoir geological model based on the physical property parameters. The terminal determines the injection position based on the sand body connectivity information of the reservoir geological model, wherein the sand body connectivity information is used to indicate the connectivity of the sand bodies in the reservoir. The terminal determines the injection fluid volume based on the first model information of the reservoir geological model, wherein the first simulation information is used to indicate the pressure field, oil saturation field, and water saturation field distribution in the reservoir under different injection fluid volume conditions.

[0074] 202. The terminal determines the energy-enhancing medium according to the physical property parameters.

[0075] In the embodiment of the present application, the terminal can determine the fluid characteristics and physical characteristics of the reservoir according to the above physical parameters. The terminal determines the reservoir type of the reservoir according to the fluid characteristics and physical characteristics. Finally, the terminal determines the energy-enhancing medium according to the reservoir type. Among them, the reservoir type is divided based on the permeability of the reservoir. The optional reservoir types include ultra-low permeability reservoirs, tight reservoirs, and heavy oil reservoirs, etc., which are not limited in the embodiment of the present application.

[0076] Optionally, for ultra-low permeability reservoirs, the energizing medium is active water, which includes the following components: 0.2%-0.5% potassium chloride and 0.2%-0.5% anti-swelling agent. For tight reservoirs, the energizing medium is active water and liquid nitrogen. For heavy oil reservoirs, the energizing medium is active water and liquid carbon dioxide.

[0077] 203. The terminal determines the injection displacement according to the fracturing fracture simulation model and the energizing medium. The fracturing fracture simulation model is established based on the rock mechanics characteristics of the reservoir, the wellbore trajectory, the fluid properties and the ground stress characteristics.

[0078] In the embodiment of the present application, the terminal can determine the second simulation information according to the fracturing fracture simulation model and the above-mentioned energizing medium, and the second simulation information is used to indicate the fracture morphology of the reservoir under different injection displacement conditions of the energizing medium. The terminal determines the injection displacement according to the second simulation information.

[0079] It should be noted that a fracturing fracture simulation model can be established using information such as the reservoir's rock mechanics characteristics, wellbore trajectory, fluid properties, and geostress characteristics as parameters. The fracturing fracture simulation model can simulate the fracture morphology under different injection displacement conditions. The terminal can select an injection displacement with the best corresponding fracture morphology from multiple simulated injection displacements based on the simulation results as the final injection displacement to be used.

[0080] 204. The terminal controls the injection of the energizing medium from the injection position through the target well according to the injection displacement, until the injection liquid volume is reached.

[0081] In the embodiment of the present application, after obtaining the above-mentioned energizing medium, injection position, injection fluid volume and injection displacement, the terminal can control the energizing medium to be injected from the above-mentioned injection position through the target well in a manner higher than the formation fracture pressure according to the above-mentioned injection displacement until the above-mentioned injection fluid volume is reached, that is, the injection fluid volume is the total amount of the injected energizing medium. The target well is the above-mentioned horizontal well. For example, the injection displacement is greater than 5 cubic meters per minute.

[0082] Optionally, during the injection of the energizing medium, the terminal can obtain fracture morphology information in real time. In response to the fracture morphology information indicating that the fracture morphology is single, the terminal outputs a temporary plugging diversion agent signal, which is used to indicate that a temporary plugging diversion agent is added during the injection of the energizing medium. By adding a temporary plugging diversion agent during the injection process, the complexity of the fracture can be increased, thereby increasing the scope of water injection.

[0083] For example, the terminal uses potential method crack monitoring technology to monitor crack morphology in real time.

[0084] 205. The terminal closes the target well and monitors the wellhead pressure of the target well.

[0085] In the embodiment of the present application, after the injection of the energizing medium is completed, the terminal can control the closing of the target well to shut down the target well. During the shut-in period, the terminal monitors the wellhead pressure of the target well in real time. If the wellhead pressure reaches the target pressure, the shut-in is terminated. Optionally, the target pressure is 3MPa, which is not limited in the embodiment of the present application.

[0086] 206. In response to the wellhead pressure reaching the target pressure, the terminal outputs a volume fracturing signal, where the volume fracturing signal is used to indicate a volume fracturing operation.

[0087] In an embodiment of the present application, if the terminal monitors that the wellhead pressure reaches the target pressure, it means that subsequent large-scale volume fracturing operations can be performed. Accordingly, the terminal can output a volume fracturing signal to instruct the fracturing equipment to perform a volume fracturing operation.

[0088] It should be noted that the above steps 201 to 206 are exemplary introductions to the main process of the low permeability reservoir energy enhancement method provided by the present application. The following is an introduction based on two specific implementations.

[0089] In an optional implementation, the terminal adopts a single-stage energization method to implement the low permeability reservoir energization method provided in the present application.

[0090] First, the terminal obtains the physical parameters of the reservoir and establishes a reservoir geological model of the low permeability reservoir based on the physical parameters. The terminal determines that the wellbore trajectory is in a connected sand body based on the reservoir geological model, thereby determining to perform early energy enhancement in the first section. The terminal simulates the pressure field and saturation field distribution in the reservoir under different injection fluid volume conditions based on the reservoir geological model and determines that the injection fluid volume is 4500 cubic meters.

[0091] Secondly, the terminal determines that the reservoir is an ultra-low permeability reservoir based on the physical property parameters, and thus determines active water as the energizing medium, that is, the energizing fluid. The components of the energizing fluid include: 0.2%-0.5% potassium chloride and 0.2%-0.5% anti-swelling agent.

[0092] Thirdly, the terminal establishes a fracturing fracture simulation model according to parameters such as the rock mechanics characteristics of the reservoir, wellbore trajectory, fluid properties and ground stress characteristics. Based on the fracturing fracture simulation model, the fracture morphology of the boosting fluid under different injection rate conditions is simulated. Based on the simulation results, the terminal determines that the injection rate of the boosting fluid is best at 8-10 cubic meters per minute, and thus determines the injection rate to be 8-10 cubic meters per minute.

[0093] Again, before the first stage of fracturing, the terminal injected 4,500 cubic meters of active water into the reservoir in the first stage through the target well at a flow rate of 8-10 cubic meters per minute. During the injection process, the potential method fracture monitoring technology was used to monitor the fracture morphology in real time.

[0094] Finally, after the injection of the boosting fluid is completed, the terminal controls the target well to be shut down, conducts well shut-in, and monitors the wellhead pressure of the target well. When the wellhead pressure is less than 3MPa, the terminal outputs a volume fracturing signal, and the fracturing equipment conducts large-scale volume fracturing.

[0095] In an optional implementation, the terminal adopts a multi-stage energy enhancement method to implement the low permeability reservoir energy enhancement method provided in the present application.

[0096] First, the terminal obtains the physical parameters of the reservoir, and establishes a reservoir geological model of the low permeability reservoir based on the physical parameters. The terminal determines that the wellbore trajectory passes through two sand bodies based on the reservoir geological model, thereby determining the early energy enhancement before the first and third stages of fracturing. The terminal simulates the pressure field and saturation field distribution in the reservoir under different injection fluid volume conditions based on the reservoir geological model, and determines that the injection volume of the first stage of early energy enhancement is 2000 cubic meters, and the injection volume of the third stage of early energy enhancement is 2500 cubic meters.

[0097] Secondly, the terminal determines that the reservoir is a dense reservoir based on the physical property parameters, and thus determines active water and liquid nitrogen as the energizing medium, that is, active water is used as the energizing fluid, and liquid nitrogen is injected at the same time. The components of the energizing fluid include: 0.2%-0.5% potassium chloride and 0.2%-0.5% anti-swelling agent.

[0098] Thirdly, the terminal obtains parameters such as the rock mechanics characteristics, wellbore trajectory, fluid properties and ground stress characteristics of the reservoir to establish a fracturing fracture simulation model. Based on the fracturing fracture simulation model, the fracture morphology of the boosting fluid under different injection rate conditions is simulated. According to the simulation results, the terminal determines that the injection rate of the boosting fluid is best at 8-10 cubic meters per minute, and thus determines the injection rate to be 8-10 cubic meters per minute.

[0099] Again, before the first stage of fracturing, the terminal injected 2,000 cubic meters of active water and 60 tons of liquid nitrogen into the reservoir in the first stage through the target well at a displacement of 8-10 cubic meters per minute. During the injection process, the terminal used the potential method fracture monitoring technology to monitor the fracture morphology in real time. Since the fracture morphology detected by the potential method fracture is relatively simple, the terminal controls the addition of temporary plugging diversion agents during the injection process to increase the complexity of the fractures and the scope of water injection.

[0100] Once again, after the injection of the booster fluid in the first section is completed, the terminal controls the target well to be shut down, shuts down the well, and monitors the wellhead pressure of the target well in real time. When the wellhead pressure is less than 3MPa, the terminal outputs a volume fracturing signal, and the fracturing equipment performs large-scale volume fracturing on the first and second sections.

[0101] Again, before the third stage of fracturing, the terminal injected 2,500 cubic meters of active water and 80 tons of liquid nitrogen into the reservoir at a displacement of 8-10 cubic meters per minute through the target well in the third stage. During the injection process, the terminal used the potential method fracture monitoring technology to monitor the fracture morphology in real time. Since the fracture morphology detected by the potential method fracture is relatively simple, the terminal controls the addition of temporary plugging diversion agents during the injection process to increase the complexity of the fractures and the scope of water injection.

[0102] Finally, after the injection of the boosting fluid is completed, the terminal controls the target well to be shut down, and monitors the wellhead pressure of the target well in real time. When the wellhead pressure is less than 3MPa, the terminal outputs a volume fracturing signal, and the fracturing equipment performs large-scale volume fracturing on the subsequent sections.

[0103] It should be noted that according to field practice, the production of low permeability oil wells that use this low permeability reservoir energy enhancement method for volume fracturing is three times the production of oil wells that are directly volume fractured without using this method.

[0104] In an embodiment of the present application, a method for enhancing the energy of a low permeability reservoir is provided. By determining the energy-enhancing medium to be injected, the injection position, the injection liquid volume, and the injection displacement according to the relevant information of the reservoir before fracturing, a large amount of energy-enhancing liquid is injected into the reservoir to increase the liquid sweep range. Then, the reservoir pressure maintenance level is improved by shutting in the well and replacing oil with water. Finally, subsequent large-scale volume fracturing is carried out in a timely manner according to the wellhead pressure, which can significantly improve the development effect of the low permeability reservoir.

[0105] Figure 3 is a block diagram of a low permeability reservoir energy enhancement device provided according to an embodiment of the present application. The device is used to perform the steps of the low permeability reservoir energy enhancement method described above, see Figure 3 The device includes: a determination module 301, a control module 302, a closing module 303 and an output module 304.

[0106] The determination module 301 is used to determine the energizing medium to be injected, the injection position, the injection amount and the injection displacement according to the physical parameters of the reservoir, the rock mechanical characteristics, the wellbore trajectory, the fluid properties and the ground stress characteristics;

[0107] A control module 302, for controlling the energizing medium to be injected from the injection position through the target well according to the injection displacement, until the injection fluid volume is reached;

[0108] A closing module 303 is used to close the target well and monitor the wellhead pressure of the target well;

[0109] The output module 304 is used to output a volume fracturing signal in response to the wellhead pressure reaching the target pressure, and the volume fracturing signal is used to indicate to perform a volume fracturing operation.

[0110] In an optional implementation, the determining module 301 includes:

[0111] A first determining unit, used for determining the injection position and the injection liquid amount according to the physical property parameters of the reservoir;

[0112] A second determining unit, used to determine the energizing medium according to the physical property parameter;

[0113] The third determination unit is used to determine the injection displacement according to the fracturing fracture simulation model and the energizing medium, wherein the fracturing fracture simulation model is established according to the rock mechanical characteristics, the wellbore trajectory, the fluid properties and the ground stress characteristics.

[0114] In an optional implementation, the first determination unit is used to establish a reservoir geological model based on the physical parameters of the reservoir; determine the injection position based on the sand body connectivity information of the reservoir geological model, and the sand body connectivity information is used to indicate the connectivity of the sand bodies in the reservoir; determine the injection liquid volume based on the first simulation information of the reservoir geological model, and the first simulation information is used to indicate the pressure field, oil saturation field and water saturation field distribution in the reservoir under different injection liquid volume conditions.

[0115] In an optional implementation, the first determination unit is used to determine the injection position as the first section in response to the sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory is in a connected sand body; and to determine the injection position as the section where the sand body is located in response to the sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory passes through at least two sand bodies.

[0116] In an optional implementation, the second determination unit is used to determine the fluid characteristics and physical property characteristics of the reservoir according to the physical property parameters; determine the reservoir type of the reservoir according to the fluid characteristics and the physical property characteristics; and determine the energizing medium according to the reservoir type.

[0117] In an optional implementation, the second determination unit is used to determine that the energizing medium is active water and liquid nitrogen in response to the reservoir type being a tight reservoir; and to determine that the energizing medium is active water and liquid carbon dioxide in response to the reservoir type being a heavy oil reservoir.

[0118] In an optional implementation, the third determination unit is used to determine second simulation information based on the fracturing fracture simulation model and the energizing medium, wherein the second simulation information is used to indicate the fracture morphology of the reservoir under different injection displacement conditions of the energizing medium; and determine the injection displacement based on the second simulation information.

[0119] In an optional implementation, the control module 302 is used to control the energizing medium to be injected from the injection position through the target well in a manner higher than the formation fracture pressure according to the injection displacement until the injection fluid volume is reached.

[0120] In an optional implementation, the device further includes:

[0121] An information acquisition module, used to acquire crack morphology information in real time during the injection process of the energizing medium;

[0122] The output module 304 is further configured to output a temporary plugging and diverting agent signal in response to the fracture morphology information indicating that the fracture morphology is single, wherein the temporary plugging and diverting agent signal is configured to indicate that a temporary plugging and diverting agent is added during the injection process of the energizing medium.

[0123] In an embodiment of the present application, a method for enhancing the energy of a low permeability reservoir is provided. By determining the energy-enhancing medium to be injected, the injection position, the injection liquid volume, and the injection displacement according to the relevant information of the reservoir before fracturing, a large amount of energy-enhancing liquid is injected into the reservoir to increase the liquid sweep range. Then, the reservoir pressure maintenance level is improved by shutting in the well and replacing oil with water. Finally, subsequent large-scale volume fracturing is carried out in a timely manner according to the wellhead pressure, which can significantly improve the development effect of the low permeability reservoir.

[0124] It should be noted that: the low permeability reservoir energy enhancement device provided in the above embodiment only uses the division of the above functional modules as an example when performing reservoir energy enhancement. In actual applications, the above functional distribution can be completed by different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the low permeability reservoir energy enhancement device provided in the above embodiment and the low permeability reservoir energy enhancement method embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0125] In the embodiments of the present application, the computer device can be configured as a terminal or a server. When the computer device is configured as a terminal, the terminal can be used as the execution subject to implement the technical solution provided in the embodiments of the present application. When the computer device is configured as a server, the server can be used as the execution subject to implement the technical solution provided in the embodiments of the present application. The technical solution provided in the present application can also be implemented through interaction between the terminal and the server. The embodiments of the present application are not limited to this.

[0126] Figure 4 This is a block diagram of a terminal 400 provided according to an embodiment of the present application. The terminal 400 may be a portable mobile terminal, such as a smart phone, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III), an MP4 player (Moving Picture Experts Group Audio Layer IV), a laptop computer or a desktop computer. The terminal 400 may also be referred to as a user device, a portable terminal, a laptop terminal, a desktop terminal or other names.

[0127] Typically, the terminal 400 includes a processor 401 and a memory 402 .

[0128] The processor 401 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 401 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor 401 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 401 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 401 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0129] The memory 402 may include one or more computer-readable storage media, which may be non-transitory. The memory 402 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 402 is used to store at least one computer program, which is used to be executed by the processor 401 to implement the low permeability reservoir energy enhancement method provided in the method embodiment of the present application.

[0130] In some embodiments, the terminal 400 may further optionally include: a peripheral device interface 403 and at least one peripheral device. The processor 401, the memory 402 and the peripheral device interface 403 may be connected via a bus or a signal line. Each peripheral device may be connected to the peripheral device interface 403 via a bus, a signal line or a circuit board. Specifically, the peripheral device includes: at least one of a radio frequency circuit 404, a display screen 405, a camera assembly 406, an audio circuit 407, a positioning assembly 408 and a power supply 409.

[0131] The peripheral device interface 403 may be used to connect at least one peripheral device related to I / O (Input / Output) to the processor 401 and the memory 402. In some embodiments, the processor 401, the memory 402, and the peripheral device interface 403 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 401, the memory 402, and the peripheral device interface 403 may be implemented on a separate chip or circuit board, which is not limited in this embodiment.

[0132] The radio frequency circuit 404 is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuit 404 communicates with the communication network and other communication devices through electromagnetic signals. The radio frequency circuit 404 converts the electrical signal into an electromagnetic signal for transmission, or converts the received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 404 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, etc. The radio frequency circuit 404 can communicate with other terminals through at least one wireless communication protocol. The wireless communication protocol includes but is not limited to: the World Wide Web, a metropolitan area network, an intranet, various generations of mobile communication networks (2G, 3G, 4G and 5G), a wireless local area network and / or a WiFi (Wireless Fidelity) network. In some embodiments, the radio frequency circuit 404 may also include circuits related to NFC (Near Field Communication), which is not limited in this application.

[0133] The display screen 405 is used to display the UI (User Interface). The UI may include graphics, text, icons, videos, and any combination thereof. When the display screen 405 is a touch display screen, the display screen 405 also has the ability to collect touch signals on the surface or above the surface of the display screen 405. The touch signal can be input to the processor 401 as a control signal for processing. At this time, the display screen 405 can also be used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. In some embodiments, the display screen 405 can be one, set on the front panel of the terminal 400; in other embodiments, the display screen 405 can be at least two, respectively set on different surfaces of the terminal 400 or in a folding design; in other embodiments, the display screen 405 can be a flexible display screen, set on the curved surface or folding surface of the terminal 400. Even, the display screen 405 can also be set to a non-rectangular irregular shape, that is, a special-shaped screen. The display screen 405 can be made of materials such as LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode, organic light-emitting diode).

[0134] The camera assembly 406 is used to capture images or videos. Optionally, the camera assembly 406 includes a front camera and a rear camera. Typically, the front camera is arranged on the front panel of the terminal, and the rear camera is arranged on the back of the terminal. In some embodiments, there are at least two rear cameras, which are any one of a main camera, a depth of field camera, a wide-angle camera, and a telephoto camera, so as to realize the fusion of the main camera and the depth of field camera to realize the background blur function, the fusion of the main camera and the wide-angle camera to realize the panoramic shooting and VR (Virtual Reality) shooting function or other fusion shooting functions. In some embodiments, the camera assembly 406 may also include a flash. The flash can be a monochrome temperature flash or a dual-color temperature flash. A dual-color temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation at different color temperatures.

[0135] The audio circuit 407 may include a microphone and a speaker. The microphone is used to collect sound waves from the user and the environment, and convert the sound waves into electrical signals and input them into the processor 401 for processing, or input them into the radio frequency circuit 404 to achieve voice communication. For the purpose of stereo acquisition or noise reduction, there may be multiple microphones, which are respectively arranged at different parts of the terminal 400. The microphone may also be an array microphone or an omnidirectional acquisition microphone. The speaker is used to convert the electrical signal from the processor 401 or the radio frequency circuit 404 into sound waves. The speaker may be a traditional film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert the electrical signal into sound waves audible to humans, but also convert the electrical signal into sound waves inaudible to humans for purposes such as ranging. In some embodiments, the audio circuit 407 may also include a headphone jack.

[0136] Positioning component 408 is used to locate the current geographical location of terminal 400 to implement navigation or LBS (Location Based Service). Positioning component 408 can be a positioning component based on the US GPS (Global Positioning System), China's Beidou system or Russia's Galileo system.

[0137] The power supply 409 is used to power various components in the terminal 400. The power supply 409 can be an alternating current, a direct current, a disposable battery, or a rechargeable battery. When the power supply 409 includes a rechargeable battery, the rechargeable battery can be a wired rechargeable battery or a wireless rechargeable battery. A wired rechargeable battery is a battery charged through a wired line, and a wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery can also be used to support fast charging technology.

[0138] In some embodiments, the terminal 400 further includes one or more sensors 410 , including but not limited to: an acceleration sensor 411 , a gyroscope sensor 412 , a pressure sensor 413 , a fingerprint sensor 414 , an optical sensor 415 , and a proximity sensor 416 .

[0139] The acceleration sensor 411 can detect the magnitude of acceleration on the three coordinate axes of the coordinate system established by the terminal 400. For example, the acceleration sensor 411 can be used to detect the components of gravity acceleration on the three coordinate axes. The processor 401 can control the display screen 405 to display the user interface in a horizontal view or a vertical view according to the gravity acceleration signal collected by the acceleration sensor 411. The acceleration sensor 411 can also be used to collect game or user motion data.

[0140] The gyro sensor 412 can detect the body direction and rotation angle of the terminal 400, and the gyro sensor 412 can cooperate with the acceleration sensor 411 to collect the user's 3D actions on the terminal 400. The processor 401 can implement the following functions based on the data collected by the gyro sensor 412: motion sensing (such as changing the UI according to the user's tilt operation), image stabilization during shooting, game control, and inertial navigation.

[0141] The pressure sensor 413 can be set on the side frame of the terminal 400 and / or the lower layer of the display screen 405. When the pressure sensor 413 is set on the side frame of the terminal 400, it can detect the user's holding signal of the terminal 400, and the processor 401 performs left and right hand recognition or shortcut operation according to the holding signal collected by the pressure sensor 413. When the pressure sensor 413 is set on the lower layer of the display screen 405, the processor 401 controls the operability controls on the UI interface according to the user's pressure operation on the display screen 405. The operability controls include at least one of a button control, a scroll bar control, an icon control, and a menu control.

[0142] The fingerprint sensor 414 is used to collect the user's fingerprint, and the processor 401 identifies the user's identity based on the fingerprint collected by the fingerprint sensor 414, or the fingerprint sensor 414 identifies the user's identity based on the collected fingerprint. When the user's identity is identified as a trusted identity, the processor 401 authorizes the user to perform relevant sensitive operations, which include unlocking the screen, viewing encrypted information, downloading software, paying, and changing settings. The fingerprint sensor 414 can be set on the front, back, or side of the terminal 400. When a physical button or a manufacturer logo is set on the terminal 400, the fingerprint sensor 414 can be integrated with the physical button or the manufacturer logo.

[0143] The optical sensor 415 is used to collect the ambient light intensity. In one embodiment, the processor 401 can control the display brightness of the display screen 405 according to the ambient light intensity collected by the optical sensor 415. Specifically, when the ambient light intensity is high, the display brightness of the display screen 405 is increased; when the ambient light intensity is low, the display brightness of the display screen 405 is decreased. In another embodiment, the processor 401 can also dynamically adjust the shooting parameters of the camera assembly 406 according to the ambient light intensity collected by the optical sensor 415.

[0144] The proximity sensor 416, also called a distance sensor, is usually disposed on the front panel of the terminal 400. The proximity sensor 416 is used to collect the distance between the user and the front of the terminal 400. In one embodiment, when the proximity sensor 416 detects that the distance between the user and the front of the terminal 400 is gradually decreasing, the processor 401 controls the display screen 405 to switch from the screen-on state to the screen-off state; when the proximity sensor 416 detects that the distance between the user and the front of the terminal 400 is gradually increasing, the processor 401 controls the display screen 405 to switch from the screen-off state to the screen-on state.

[0145] Those skilled in the art will understand that Figure 4 The structure shown in the figure does not constitute a limitation on the terminal 400, and the terminal 400 may include more or less components than those shown in the figure, or combine some components, or adopt a different component arrangement.

[0146] Figure 5 It is a structural diagram of a server provided according to an embodiment of the present application. The server 500 may have relatively large differences due to different configurations or performances, and may include one or more processors (Central Processing Units, CPU) 501 and one or more memories 502, wherein the memory 502 stores at least one computer program, and the at least one computer program is loaded and executed by the processor 501 to implement the low permeability reservoir energy enhancement method provided by the above-mentioned various method embodiments. Of course, the server may also have components such as a wired or wireless network interface, a keyboard, and an input and output interface for input and output, and the server may also include other components for implementing device functions, which will not be repeated here.

[0147] An embodiment of the present application also provides a computer-readable storage medium, which is applied to a computer device, and the computer-readable storage medium stores at least one computer program, which is loaded and executed by a processor to implement the operations performed by the computer device in the low permeability reservoir energization method of the above embodiment.

[0148] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0149] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for enhancing energy of a low permeability reservoir, characterized in that: The method comprises: Establishing a reservoir geological model according to the physical property parameters of the reservoir; In response to the sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory is in a connected sand body, determining the injection position as the first segment; In response to sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory passes through at least two sand bodies, determining that the injection position is a location segment where the sand bodies are located, wherein the sand body connectivity information is used to indicate connectivity of the sand bodies in the reservoir; Determining the injection fluid volume according to first simulation information of the reservoir geological model, wherein the first simulation information is used to indicate the distribution of pressure field, oil saturation field and water saturation field in the reservoir under different injection fluid volume conditions; Determining fluid characteristics and physical property characteristics of the reservoir according to the physical property parameters; Determining the reservoir type of the reservoir according to the fluid characteristics and the physical property characteristics; In response to the reservoir type being a tight reservoir, determining the energizing medium to be active water and liquid nitrogen; In response to the reservoir type being a heavy oil reservoir, determining the energizing medium to be active water and liquid carbon dioxide; Determining second simulation information according to the fracturing fracture simulation model and the energizing medium, wherein the second simulation information is used to indicate the fracture morphology of the reservoir under different injection displacement conditions of the energizing medium; Determine the injection displacement according to the second simulation information, wherein the fracturing fracture simulation model is established according to the rock mechanics characteristics, wellbore trajectory, fluid properties and ground stress characteristics of the reservoir; According to the injection displacement, controlling the energizing medium to be injected from the injection position through the target well until the injection fluid volume is reached; Closing the target well and monitoring the wellhead pressure of the target well; In response to the wellhead pressure reaching the target pressure, a volume fracturing signal is output, wherein the volume fracturing signal is used to indicate that a volume fracturing operation is to be performed.

2. The method according to claim 1, characterized in that: The step of controlling the energizing medium to be injected from the injection position through the target well according to the injection displacement until the injection fluid volume is reached includes: According to the injection displacement, the energizing medium is controlled to be injected from the injection position through the target well in a manner higher than the formation fracture pressure until the injection fluid volume is reached.

3. The method according to claim 1, characterized in that The method further comprises: During the injection of the energizing medium, real-time acquisition of fracture morphology information; In response to the fracture morphology information indicating that the fracture morphology is single, a temporary plugging and diverting agent signal is output, wherein the temporary plugging and diverting agent signal is used to indicate the addition of a temporary plugging and diverting agent during the injection process of the energizing medium.

4. A low permeability reservoir energy enhancement device, characterized in that: The device comprises: A determination module, comprising: a first determination unit, a second determination unit and a third determination unit; The first determination unit is used to establish a reservoir geological model according to the physical property parameters of the reservoir; The first determination unit is further configured to determine the injection position as the first section in response to the sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory is in a connected sand body; The first determination unit is further configured to determine the injection position as a position segment where the sand bodies are located in response to sand body connectivity information of the reservoir geological model indicating that the wellbore trajectory passes through at least two sand bodies, wherein the sand body connectivity information is used to indicate connectivity of the sand bodies in the reservoir; The first determination unit is further used to determine the injection fluid volume according to the first simulation information of the reservoir geological model, wherein the first simulation information is used to indicate the distribution of the pressure field, the oil saturation field and the water saturation field in the reservoir under different injection fluid volume conditions; The second determination unit is used to determine the fluid characteristics and physical property characteristics of the reservoir according to the physical property parameters; The second determination unit is further used to determine the reservoir type of the reservoir according to the fluid characteristics and the physical property characteristics; The second determination unit is further configured to determine that the energizing medium is active water and liquid nitrogen in response to the reservoir type being a tight reservoir; The second determination unit is further configured to determine, in response to the reservoir type being a heavy oil reservoir, that the energizing medium is active water and liquid carbon dioxide; The third determination unit is used to determine second simulation information according to the fracturing fracture simulation model and the energizing medium, wherein the second simulation information is used to indicate the fracture morphology of the reservoir under different injection displacement conditions of the energizing medium; The third determination unit is further used to determine the injection displacement according to the second simulation information, and the fracturing fracture simulation model is established according to the rock mechanics characteristics, wellbore trajectory, fluid properties and ground stress characteristics of the reservoir; a control module, configured to control the energizing medium to be injected from the injection position through the target well according to the injection displacement, until the injection fluid volume is reached; A closing module, used to close the target well and monitor the wellhead pressure of the target well; The output module is used to output a volume fracturing signal in response to the wellhead pressure reaching a target pressure, wherein the volume fracturing signal is used to indicate a volume fracturing operation.

5. The device according to claim 4, characterized in that The control module is used to control the energizing medium to be injected from the injection position through the target well in a manner higher than the formation fracture pressure according to the injection displacement until the injection fluid volume is reached.

6. The device according to claim 4, characterized in that The device also includes: An information acquisition module, used to acquire crack morphology information in real time during the injection process of the energizing medium; The output module is further configured to output a temporary plugging and diverting agent signal in response to the fracture morphology information indicating that the fracture morphology is single, wherein the temporary plugging and diverting agent signal is configured to indicate that a temporary plugging and diverting agent is added during the injection process of the energizing medium.

7. A computer device, characterized in that: The computer device comprises a processor and a memory, wherein the memory is used to store at least one computer program, and the at least one computer program is loaded by the processor and executes the low permeability reservoir energy enhancement method according to any one of claims 1 to 3.

8. A storage medium, characterized in that: The storage medium is used to store at least one computer program, and the at least one computer program is used to execute the low permeability reservoir energy enhancement method according to any one of claims 1 to 3.

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