Annular pressure judgment method and device, medium and electronic equipment

Abstract

The invention discloses an annulus under-pressure judgment method and device, a medium and electronic equipment. The method comprises the following steps: acquiring a production curve and an annular pressure curve of a current gas storage; according to the production curve and the annulus pressure curve, a characteristic curve recognition model is constructed, and the characteristic curve recognition model is used for screening and fitting annulus belt pressure according to pressure data; oil pressure and annulus pressure corresponding to the injection-production well in the preset period are obtained; and on the basis of the characteristic curve recognition model, the oil pressure and the annulus pressure, fitting is conducted on the annulus belt pressure of the injection and production well. According to the invention, the accuracy of identifying the annulus pressure can be improved.

Description

Background Art

[0002] The safe control and stable operation of gas storage injection and production wells are important guarantees for gas storage construction, safe and stable production, and even for ensuring stable and controllable national gas storage.

[0003] The operation mode of the injection and production wells in a single injection and production cycle of a gas storage reservoir is divided into the injection period, the balance period, and the production period. During the injection and production process, due to the alternating injection and production conditions, the injection and production pipe string, the seal of the packer, and the poor cementing quality, the A annulus (casing annulus) or B annulus (casing annulus) of the injection and production well will have a certain pressure, which will affect the daily safe and stable operation of the injection and production well to a certain extent. Therefore, how to improve the accuracy of identifying annulus pressure is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present application is to provide a method, device, medium and electronic equipment for determining annular pressure. The present application can improve the accuracy of identifying annular pressure.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to one aspect of an embodiment of the present application, a method for determining annular pressure is provided, characterized in that the method comprises: obtaining a production curve and annular pressure curve of a current gas storage reservoir; constructing a characteristic curve recognition model based on the production curve and the annular pressure curve, wherein the characteristic curve recognition model is used to screen and fit the annular pressure based on pressure data; obtaining the oil pressure and annular pressure corresponding to the injection and production wells within a preset period; and fitting the annular pressure of the injection and production wells based on the characteristic curve recognition model, the oil pressure and the annular pressure.

[0007] In one embodiment of the present application, based on the aforementioned scheme, the annulus pressure of the injection and production well is fitted based on the characteristic curve identification model, the oil pressure and the annulus pressure, including: calculating the degree of fit of the annulus pressure of the injection and production well with each of the characteristic curve identification models based on the characteristic curve identification model, the oil pressure and the annulus pressure; for the annulus pressure of the injection and production well and the annulus pressure type of the characteristic curve identification model, if the degree of fit of the annulus pressure of the injection and production well with any one of the characteristic curve identification models is greater than a first preset degree of fit, and the degree of fit with the remaining characteristic curve identification models is less than a second preset degree of fit, then the characteristic curve identification model corresponding to the first preset degree of fit is the target model, wherein the annulus pressure types include A annulus pressure, B annulus pressure and C annulus pressure.

[0008] In one embodiment of the present application, based on the above scheme, the characteristic curve identification model includes a first pressure model, which is a pressure model of the injection and production well A of the gas storage reservoir with normal annulus. The first pressure model is as follows:

[0009]

[0010] Among them, y a is the annulus pressure of A, MPa; t is the injection and production time, day; a and b are parameters related to the basic information of a single well, dimensionless; C is the normal pressurized pressure after reaching capacity, MPa.

[0011] In one embodiment of the present application, based on the above solution, the characteristic curve identification model includes a second pressure model, which is a pressure model of annulus A caused by failure of the tubing hanger. The second pressure model is as follows:

[0012]

[0013]

[0014] Among them, y 0 is the initial pressure value, MPa; A, ω, t c It is a dimensionless parameter related to the basic information of a single well.

[0015] In one embodiment of the present application, based on the above scheme, the characteristic curve identification model includes a third pressure model, which is a pressure model of the injection and production string thread causing micro-leakage leading to the A annulus. The third pressure model is as follows:

[0016]

[0017] y g -y a =a+bt+cρ t

[0018] Among them, y 0 is the initial pressure value, MPa; A1, A2, a, b, c, ρ are all dimensionless parameters related to the basic information of a single well.

[0019] In one embodiment of the present application, based on the above solution, the first preset degree of fit is 90%.

[0020] In one embodiment of the present application, based on the above solution, the second preset degree of fit is 70%.

[0021] According to one aspect of an embodiment of the present application, a device for determining an annulus pressure is provided, characterized in that the device comprises: a first acquisition unit, used to acquire a production curve and annulus pressure curve of a current gas storage reservoir; a construction unit, used to construct a characteristic curve recognition model according to the production curve and the annulus pressure curve, wherein the characteristic curve recognition model is used to screen and fit the annulus pressure according to pressure data; a second acquisition unit, used to acquire the oil pressure and annulus pressure corresponding to the injection and production wells within a preset period; and a fitting unit, used to fit the annulus pressure of the injection and production wells based on the characteristic curve recognition model, the oil pressure and the annulus pressure.

[0022] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. The computer program includes executable instructions. When the executable instructions are executed by a processor, the method described in the above embodiment is implemented.

[0023] According to one aspect of an embodiment of the present application, an electronic device is provided, comprising: one or more processors; and a memory for storing executable instructions of the processors, wherein when the executable instructions are executed by the one or more processors, the one or more processors implement the methods described in the above embodiments.

[0024] In the technical solution of the embodiment of the present application, by obtaining the production curve and annular pressure curve of the current gas storage, and analyzing the changing rules of the annular pressures at each level, a characteristic curve identification model is constructed, wherein the characteristic curve identification model is used to screen and fit the annular pressure according to the pressure data. The characteristic curve identification model may include a normal pressure model of the annular space A of the injection and production well of the gas storage, a pressure model of the annular space A caused by the failure of the tubing hanger, a pressure model of the annular space A caused by micro-leakage of the injection and production pipe string thread, a pressure model of the annular space A caused by serious leakage of the injection and production pipe string and downhole tools, a pressure model of the annular space B caused by micro-gap of the cement ring, a pressure model caused by the failure of the casing head seal of the annular space B, and a pressure model of the failure of the casing head of the annular space C.

[0025] Then, the annular pressure of the injection-production well is fitted by obtaining the oil pressure and annular pressure corresponding to the injection-production well within the preset period and combining the characteristic curve recognition model.

[0026] The well annulus pressure judgment based on the present application improves the accuracy of identifying annulus pressure. At the same time, the cause of annulus pressure in the injection and production wells of the gas storage reservoir can be quickly and accurately determined, providing theoretical support for subsequent treatment of annulus pressure.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0029] Figure 1 It is a flow chart of a method for determining annular pressure according to an embodiment of the present application;

[0030] Figure 2 is a block diagram of an annulus pressure determination device according to an embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the system structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0033] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0034] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0035] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0036] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0037] The implementation details of the technical solution of the embodiment of the present application are described in detail below:

[0038] According to one aspect of the present application, a method for determining annular pressure is provided. Figure 1 The flowchart of the annular pressure determination method according to the embodiment of the present application is shown. The annular pressure determination method can be executed by a device with a computing and processing function. The annular pressure determination method includes at least steps 110 to 140, which are described in detail as follows:

[0039] In step 110, the current production curve and annulus pressure curve of the gas storage are obtained.

[0040] In this application, the operation mode of the injection and production wells in a single injection and production cycle of the gas storage reservoir is divided into the injection period, the balance period, and the gas production period. During the injection and production process, due to the alternating injection and production conditions, the injection and production pipe string, the poor sealing of the packer, and the poor cementing quality, the injection and production well A annulus (i.e., the oil casing annulus) or B annulus (i.e., the casing annulus) will be under certain pressure, and to a certain extent, the daily safe and stable operation of the injection and production well will be affected.

[0041] Therefore, by obtaining the current production curve and annular pressure curve of the gas storage, the reasons for the annular pressure in the current injection and production wells can be analyzed, and the annular pressure control work can be carried out based on the reasons.

[0042] Continue to refer to Figure 1 In step 120, a characteristic curve identification model is constructed according to the production curve and the annular pressure curve. The characteristic curve identification model is used to screen and fit the annular pressure according to the pressure data.

[0043] In the present application, a characteristic curve identification model is constructed according to the production curve and the annulus pressure curve. The constructed characteristic curve identification model may include a normal pressure model of annulus A in the injection and production well of the gas storage reservoir, a pressure model of annulus A caused by failure of the tubing hanger, a pressure model of annulus A caused by micro-leakage of the injection and production string thread, a pressure model of annulus A caused by serious leakage of the injection and production string and downhole tools, a pressure model of annulus B caused by micro-gap of the cement ring, a pressure model caused by failure of the casing head seal of the annulus B, and a pressure model of failure of the casing head of the annulus C.

[0044] Further, in one embodiment of the present application, the characteristic curve identification model includes a first pressure model, which is a pressure model of a gas storage injection and production well A with a normal annulus. The first pressure model is as follows:

[0045]

[0046] Among them, y a is the annulus pressure of A, MPa; t is the injection and production time, day; a and b are parameters related to the basic information of a single well, dimensionless; C is the normal pressurized pressure after reaching capacity, MPa.

[0047] Further, in one embodiment of the present application, the characteristic curve identification model includes a second pressure model, which is a pressure model of annulus A caused by failure of the tubing hanger, and the second pressure model is as follows:

[0048]

[0049]

[0050] Among them, y 0 is the initial pressure value, MPa; A, ω, t c It is a dimensionless parameter related to the basic information of a single well.

[0051] Further, in one embodiment of the present application, the characteristic curve identification model includes a third pressure model, and the third pressure model is a pressure model of annulus A caused by micro-leakage of the injection and production string thread. The third pressure model is as follows:

[0052]

[0053] y g -y a =a+bt+cρ t

[0054] Among them, y 0 is the initial pressure value, MPa; A1, A2, a, b, c, ρ are all dimensionless parameters related to the basic information of a single well.

[0055] Further, in one embodiment of the present application, the characteristic curve identification model includes a fourth pressure model, which is a pressure model of annulus A caused by severe leakage of the injection and production string and the downhole tool. The fourth pressure model is as follows:

[0056]

[0057] Among them, y 0 is the initial pressure value, MPa; A, ω, tc It is a dimensionless parameter related to the basic information of a single well.

[0058] Further, in one embodiment of the present application, the characteristic curve identification model includes a fifth pressure model, and the fifth pressure model is a pressure model of the B annulus caused by cement annulus micro-gap, and the fifth pressure model is as follows:

[0059]

[0060] Among them, y a is the annulus pressure of A, MPa; y b is the B annulus pressure, MPa.

[0061] Further, in one embodiment of the present application, the characteristic curve identification model includes a sixth pressure model, and the sixth pressure model is a pressure model caused by the failure of the B annulus casing head seal. The sixth pressure model is as follows:

[0062]

[0063] Among them, A1 and A2 are both dimensionless parameters related to the basic information of a single well.

[0064] Further, in one embodiment of the present application, the characteristic curve identification model includes a seventh pressure model, the seventh pressure model is a pressure model of C annulus casing head failure, and the sixth pressure model is as follows:

[0065]

[0066] y c =0

[0067] Among them, y c is the annular pressure of C, MPa; y b is the annulus pressure of B, MPa. a and b are both dimensionless parameters related to the basic information of a single well.

[0068] Continue to refer to Figure 1 In step 130, the oil pressure and annulus pressure corresponding to the injection and production wells within a preset period are obtained.

[0069] In this application, the oil pressure and annulus pressure corresponding to the injection and production wells within a preset period are obtained, wherein the time of annulus pressure can be taken as the starting point, and the oil pressure and annulus pressure within 2-3 injection and production cycles after the starting point are collected. The annulus pressure includes annulus A pressure, annulus B pressure and annulus C pressure. Based on this, by fitting the oil pressure and the annulus pressure with the above-mentioned characteristic curve identification model, the reason for the leakage of the annulus pressure can be known.

[0070] Continue to refer to Figure 1 In step 140, the annulus pressure of the injection-production well is fitted based on the characteristic curve identification model, the oil pressure and the annulus pressure.

[0071] In the present application, based on the characteristic curve identification model, the oil pressure and the annulus pressure, the variation characteristics of the annulus pressure of the injection-production well are analyzed, so as to fit the annulus pressure of the injection-production well.

[0072] In one embodiment of the present application, the fitting of the annular pressure of the injection-production well based on the characteristic curve identification model, the oil pressure, and the annular pressure specifically includes steps 141 to 142:

[0073] Step 141, based on the characteristic curve identification model, the oil pressure and the annular pressure, calculating the degree of fit between the annular pressure of the injection-production well and each of the characteristic curve identification models;

[0074] Step 142, for the annulus pressure of the injection-production well and the annulus pressure type of the characteristic curve identification model, if the degree of fit between the annulus pressure of the injection-production well and any one of the characteristic curve identification models is greater than a first preset degree of fit, and the degree of fit with the remaining characteristic curve identification models is less than a second preset degree of fit, then the characteristic curve identification model corresponding to the first preset degree of fit is the target model, wherein the annulus pressure types include A annulus pressure, B annulus pressure and C annulus pressure.

[0075] In this embodiment, specifically, the first pressure model is a normal pressure model of annulus A in the injection and production well of the gas storage. The annulus pressure of the first pressure model is the annulus pressure of A. The variation characteristics of the first pressure model are: in multiple injection and production cycles, before the injection and production well reaches capacity and production, the pressure of annulus A increases slowly and linearly over time. After the injection and production well reaches capacity and production, the pressure of annulus A remains stable.

[0076] If the degree of fit between the annular pressure of the injection-production well and the first pressure model is greater than 90%, and the degree of fit between the annular pressure of the injection-production well and the pressure model of other annular pressure types A is less than 70%, then the first pressure model is the target model.

[0077] For the second pressure model, that is, the pressure model of annulus A caused by failure of the tubing hanger. The annulus pressure of the second pressure model is the annulus A pressure. The change characteristics of the second pressure model are: the oil pressure data always presents a log-normal distribution, when the oil pressure is much greater than the annulus A pressure, the annulus A pressure presents a quadratic function upward trend, and when the oil pressure is close to the annulus A pressure, the annulus A pressure maintains a log-normal distribution.

[0078] If the degree of fit between the annular pressure of the injection-production well and the second pressure model is greater than 90%, and the degree of fit between the annular pressure of the injection-production well and the pressure model of other annular pressure types A is less than 70%, then the second pressure model is the target model.

[0079] For the third pressure model, that is, the pressure model of annulus A caused by micro-leakage in the thread of the injection and production column. Among them, the annulus pressure of the third pressure model is the annulus pressure of A. The change characteristics of the third pressure model are: within a single injection and production cycle, and during the gas injection period, the pressure of annulus A increases with time and follows the Doseresp model. Within a single injection and production cycle, and during the gas production period, it basically remains stable or slightly decreases over time, showing a linear decrease or always remains stable. At the same time, the difference between the oil pressure and the annulus A pressure basically follows the Shah function.

[0080] If the degree of fit between the annular pressure of the injection-production well and the third pressure model is greater than 90%, and the degree of fit between the annular pressure of the injection-production well and the pressure model of other annular pressure types A is less than 70%, then the third pressure model is the target model.

[0081] The fourth pressure model is a pressure model in which the injection and production pipe string and downhole tools have serious leakage, resulting in annulus A pressure. The annulus pressure of the fourth pressure model is the annulus A pressure. The change characteristics of the fourth pressure model are: in multiple injection and production cycles, the oil pressure and the annulus A pressure always follow the Gaussamp model, that is, the pressure rises during the gas injection period and decreases during the gas production period.

[0082] If the degree of fit between the annular pressure of the injection-production well and the fourth pressure model is greater than 90%, and the degree of fit between the annular pressure of the injection-production well and the pressure model of other annular pressure types of A annular pressure is less than 70%, then the fourth pressure model is the target model.

[0083] For the fifth pressure model, that is, the pressure model of the B annulus caused by the micro-gap of the cement sheath. Among them, the annulus pressure of the fifth pressure model is the B annulus pressure. The change characteristics of the fifth pressure model are: in a single round of injection and production cycle, when the pressure of the B annulus is initially pressurized, the first cycle follows the Lognormal model, the second cycle follows the Gaussamp model, and then, as the degree of cracking of the cement sheath increases, the gas injection period follows the Langevin model, and the gas production period drops rapidly, which is a linear decrease.

[0084] If the degree of fit between the annular pressure of the injection-production well and the fifth pressure model is greater than 90%, and the degree of fit between the annular pressure of the injection-production well and the pressure model of other annular pressure types of B annular pressure is less than 70%, then the fifth pressure model is the target model.

[0085] For the sixth pressure model, that is, the pressure model caused by the failure of the B annulus casing head seal. Among them, the annulus pressure of the fifth pressure model is the B annulus pressure. The change characteristics of the sixth pressure model are: the A annulus and the B annulus follow the Doseresp model in the same period, and the trend is basically consistent, and the pressure rises during the gas injection period, and the pressure drops during the gas production period.

[0086] If the degree of fit between the annular pressure of the injection-production well and the sixth pressure model is greater than 90%, and the degree of fit between the annular pressure of the injection-production well and the pressure models of other annular pressure types of B annular pressure is less than 70%, then the sixth pressure model is the target model.

[0087] The seventh pressure model is the pressure model of the failure of the C annulus casing head. The annulus pressure of the seventh pressure model is the C annulus pressure. The change characteristics of the seventh pressure model are: the B annulus basically follows the Langevin model, the pressure of the C annulus is 0 after serious leakage, and surface bubbling occurs, and the pressure trend has little to do with the A annulus.

[0088] If the degree of fit between the annular pressure of the injection-production well and the seventh pressure model is greater than 90%, and the degree of fit between the annular pressure of the injection-production well and the pressure model of other annular pressure types of C annular pressure is less than 70%, then the seventh pressure model is the target model.

[0089] The following describes an embodiment of the device of the present application, which can be used to execute the annular pressure determination method in the above embodiment of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the annular pressure determination method in the above embodiment of the present application.

[0090] Figure 2 It is a block diagram of an annulus pressure determination device according to an embodiment of the present application.

[0091] Reference Figure 2 As shown, according to an annulus pressure judgment device 200 of an embodiment of the present application, the device 200 includes: a first acquisition unit 201, used to obtain the production curve and annulus pressure curve of the current gas storage reservoir; a construction unit 202, used to construct a characteristic curve recognition model according to the production curve and the annulus pressure curve, and the characteristic curve recognition model is used to screen and fit the annulus pressure according to the pressure data; a second acquisition unit 203, used to obtain the oil pressure and annulus pressure corresponding to the injection and production wells within a preset period; a fitting unit 204, used to fit the annulus pressure of the injection and production wells based on the characteristic curve recognition model, the oil pressure and the annulus pressure.

[0092] As another aspect, the present application further provides a computer-readable storage medium on which a program product capable of implementing the above method of the present specification is stored. In some possible implementations, various aspects of the present application may also be implemented in the form of a program product, which includes a program code, and when the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary implementations of the present application described in the above "Exemplary Method" section of the present specification.

[0093] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0094] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0095] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., using an Internet service provider to connect through the Internet).

[0096] As another aspect, the present application also provides an electronic device capable of implementing the above method.

[0097] Those skilled in the art will appreciate that various aspects of the present application may be implemented as a system, method or program product. Therefore, various aspects of the present application may be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software, which may be collectively referred to as "circuit", "module" or "system" herein.

[0098] Figure 3 The schematic diagram of the system structure of the electronic device according to the embodiment of the present application is shown below. Figure 3 The electronic device 300 according to this embodiment of the present application is described. Figure 3 The electronic device 300 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0099] like Figure 3 As shown, the electronic device 300 is in the form of a general computing device. The components of the electronic device 300 may include but are not limited to: at least one processing unit 310, at least one storage unit 320, and a bus 330 connecting different system components (including the storage unit 320 and the processing unit 310).

[0100] The storage unit stores program codes, which can be executed by the processing unit 310, so that the processing unit 310 executes the steps described in the above “Example Method” section of this specification according to various exemplary implementations of the present application.

[0101] The storage unit 320 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 321 and / or a cache memory unit 322 , and may further include a read-only memory unit (ROM) 323 .

[0102] The storage unit 320 may also include a program / utility 324 having a set (at least one) of program modules 325, such program modules 325 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0103] Bus 330 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0104] The electronic device 300 may also communicate with one or more external devices 1200 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 300, and / or communicate with any device that enables the electronic device 300 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 350. Furthermore, the electronic device 300 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 360. As shown, the network adapter 360 communicates with other modules of the electronic device 300 via a bus 330. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 300, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0105] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the implementation methods of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation methods of the present application.

[0106] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0107] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be performed without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for determining annular space pressure, characterized in that: The method comprises: Obtain the current production curve and annulus pressure curve of the gas storage; According to the production curve and the annular pressure curve, a characteristic curve identification model is constructed, wherein the characteristic curve identification model is used to screen and fit the annular pressure according to the pressure data; Obtain the oil pressure and annulus pressure corresponding to the injection and production wells within a preset period; Based on the characteristic curve identification model, the oil pressure and the annulus pressure, the annulus pressure of the injection-production well is fitted.

2. The method according to claim 1, characterized in that The fitting of the annular pressure of the injection-production well based on the characteristic curve identification model, the oil pressure, and the annular pressure includes: Based on the characteristic curve identification model, the oil pressure and the annular pressure, calculating the degree of fit between the annular pressure of the injection-production well and each of the characteristic curve identification models; Regarding the annulus pressure of the injection and production well and the annulus pressure type of the characteristic curve identification model, if the degree of fit between the annulus pressure of the injection and production well and any one of the characteristic curve identification models is greater than a first preset degree of fit, and the degree of fit with the remaining characteristic curve identification models is less than a second preset degree of fit, then the characteristic curve identification model corresponding to the first preset degree of fit is the target model, wherein the annulus pressure types include A annulus pressure, B annulus pressure and C annulus pressure.

3. The method according to claim 1 is characterized in that the characteristic curve identification model includes a first pressure model, which is a pressure model of a gas storage injection and production well A with normal annulus, and the first pressure model is as follows: in, y a is the annulus pressure of A, MPa; t is the injection and production time, day; a and b are parameters related to the basic information of a single well, dimensionless; C is the normal pressurized pressure after reaching capacity, MPa.

4. The method according to claim 1 is characterized in that the characteristic curve identification model includes a second pressure model, the second pressure model is a pressure model of annulus A caused by failure of the tubing hanger, and the second pressure model is as follows: in, y0 is the initial pressure value, MPa; A, ω, t c It is a dimensionless parameter related to the basic information of a single well.

5. The method according to claim 1 is characterized in that the characteristic curve identification model includes a third pressure model, and the third pressure model is a pressure model of annulus A caused by micro-leakage of the injection and production string thread, and the third pressure model is as follows: and g -and a =a+bt+cρ t in, y0 is the initial pressure value, MPa; A1, A2, a, b, c, ρ are all dimensionless parameters related to the basic information of a single well.

6. The method according to claim 2, characterized in that The first preset fitting degree is 90%.

7. The method according to claim 2, characterized in that The second preset degree of fit is 70%.

8. An annulus pressure determination device, characterized in that: The device comprises: A first acquisition unit is used to acquire a current production curve and annular pressure curve of the gas storage; A construction unit is used to construct a characteristic curve identification model according to the production curve and the annular pressure curve, wherein the characteristic curve identification model is used to screen and fit the annular pressure according to the pressure data; The second acquisition unit is used to acquire the oil pressure and annular pressure corresponding to the injection and production wells within a preset period; A fitting unit is used to fit the annulus pressure of the injection-production well based on the characteristic curve identification model, the oil pressure and the annulus pressure.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program code, and the at least one program code is loaded and executed by a processor to implement the operations performed by the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The electronic device includes one or more processors and one or more memories, wherein the one or more memories store at least one program code, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method according to any one of claims 1 to 7.

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