Casing short service life determination method, device, medium and electronic equipment

Abstract

The application discloses a casing short service life determination method, device, medium and electronic equipment. The method comprises the following steps: determining the position of surface water in casing short according to the current geological condition of injection-production well, and setting the position of the surface water as the corrosion core position of the casing short; calculating the total radial stress, total circumferential stress and total axial stress corresponding to the corrosion core position at an initial time node, so as to calculate the equivalent stress corresponding to the corrosion core position at the initial time node; and determining the safe service life of the casing short according to the equivalent stress and yield strength. The application can improve the accuracy of calculating the safe service life of the casing short.

Description

Technical Field

[0001] This application relates to the field of bushing short-circuit analysis technology, and in particular, to a method, apparatus, medium, and electronic device for determining the safe service time of bushing short-circuit. Background Technology

[0002] Currently, casing shorting is an important component of wellbore integrity and is directly related to whether oil and gas can be produced safely and smoothly. If corrosion occurs due to the external environment, it will inevitably affect the safe production and operation of injection and production wells, and may even cause major safety accidents.

[0003] In some oilfields, casing joints are submerged in surface water, leading to severe dissolved oxygen corrosion at the water interface. Combined with other external factors such as injection and production pressure, this can cause perforation or misalignment of the casing joints, resulting in steam and crude oil leaks at the wellhead, and even wellhead subsidence, significantly shortening their safe operating time.

[0004] Therefore, determining the safe service life of bushing short-circuit is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a method, apparatus, medium, and electronic device for determining the safe service time of a bushing short-circuit. This application can improve the accuracy of calculating the safe service time of a bushing short-circuit.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to one aspect of the embodiments of this application, a method for determining the safe service time of a casing short-connection is provided, characterized in that the method includes: determining the location of surface water connected to the casing short-connection based on the current geological conditions of the injection-production well, and setting the location of the surface water as the corrosion core location of the casing short-connection; calculating the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location at an initial time node, thereby calculating the equivalent stress corresponding to the corrosion core location at the initial time node; and determining the safe service time of the casing short-connection based on the equivalent stress and yield strength.

[0008] In one embodiment of this application, based on the aforementioned scheme, determining the safe service time of the bushing short-circuit according to the equivalent stress and yield strength includes: if the equivalent stress is less than the yield strength, then the next time node is taken as the new initial time node, and an accumulated node number is added, wherein the new initial time node is separated from the previous initial time node by a unit interval time, and the initial value of the accumulated node number is zero; based on the new initial time node, the step of re-calculating the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core position at the initial time node is re-executed, thereby calculating the equivalent stress corresponding to the corrosion core position at the initial time node.

[0009] In one embodiment of this application, based on the aforementioned scheme, determining the safe service time of the bushing short connection according to the equivalent stress includes: if the equivalent stress is greater than the yield strength, then calculating the safe service time of the bushing short connection based on the unit interval time and the cumulative number of nodes.

[0010] In one embodiment of this application, based on the foregoing scheme, the total radial stress is calculated using the following formula:

[0011] σ r =σ r ′+σ r "

[0012] Where, σ r The total radial stress is given in MPa; σ is the total radial stress. r ′ represents the radial stress at the core of the corrosion at the casing short-circuit, caused by internal pressure and external extrusion, in MPa; σ r "This represents the radial stress (MPa) generated at the core corrosion location of the casing short circuit due to thermal action."

[0013] In one embodiment of this application, based on the foregoing scheme, the total circumferential stress is calculated using the following formula:

[0014] σ θ =σ θ ′+σ θ "

[0015] Where, σ θ The total circumferential stress is expressed in MPa; σ θ ′ represents the circumferential stress at the core of the corrosion at the casing short-circuit point, caused by internal pressure and external extrusion, in MPa; σ θ "This represents the circumferential stress (MPa) generated at the core corrosion location of the casing short circuit due to thermal action."

[0016] In one embodiment of this application, based on the foregoing scheme, the total axial stress is calculated using the following formula:

[0017] σ z =σ zo +σ zb +σ z ′+σ z "

[0018] Where, σ z The total axial stress is expressed in MPa; σ zo The initial axial stress at the corrosion core location of the casing short circuit, caused by its own weight and buoyancy, is σ (MPa). zb The axial stress at the core corrosion location of the casing short circuit, caused by the bending of the tubing string, is measured in MPa; σ z ′ represents the axial stress at the core of the corrosion at the casing short-circuit due to internal pressure and external extrusion, measured in MPa; σ represents the stress at the core of the corrosion at the casing short-circuit. z "This represents the axial stress (MPa) generated at the core corrosion location of the casing short circuit due to thermal action."

[0019] In one embodiment of this application, based on the foregoing scheme, the equivalent stress is calculated using the following formula:

[0020]

[0021] Where, σ equ For equivalent stress, MPa; σ r The total radial stress is given in MPa; σ is the total radial stress. θ The total circumferential stress is expressed in MPa; σ z For the total axial stress, MPa.

[0022] According to one aspect of the embodiments of this application, a device for determining the safe service time of a casing short-connection is provided, characterized in that the device includes: a judgment unit, used to determine the location of surface water connected to the casing short-connection based on the current geological conditions of the injection-production well, and setting the location of the surface water as the corrosion core location of the casing short-connection; a first calculation unit, used to calculate the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location at an initial time node, thereby calculating the equivalent stress corresponding to the corrosion core location at the initial time node; and a second calculation unit, used to determine the safe service time of the casing short-connection based on the equivalent stress and yield strength.

[0023] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided, on which a computer program is stored, the computer program including executable instructions that, when executed by a processor, implement the methods described in the above embodiments.

[0024] According to one aspect of the embodiments of this application, an electronic device is provided, including: one or more processors; and a memory for storing executable instructions of the processors, which, when executed by the one or more processors, cause the one or more processors to implement the method described in the above embodiments.

[0025] In the technical solution of this application embodiment, the location of the corrosion core of the sleeve short circuit is first obtained, and the total radial stress, total circumferential stress and total axial stress corresponding to the corrosion core location are calculated.

[0026] After calculating the total radial stress, total circumferential stress, and total axial stress, the equivalent stress corresponding to the corrosion core location can be calculated. By determining whether the equivalent stress at the corrosion core location of the current sleeve shorting is less than the yield strength of the sleeve shorting under the current material, the safe service time of the sleeve shorting can be determined. Specifically, if the equivalent stress is less than the yield strength, the next time node is used as the new initial time node, and the cumulative node count is increased. Based on the new initial time node, the steps of calculating the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location at the initial time node are repeated to calculate the equivalent stress corresponding to the corrosion core location at the initial time node. If the equivalent stress is greater than the yield strength, the safe service time of the sleeve shorting is calculated based on the unit interval time and the cumulative node count.

[0027] Therefore, the method for determining the safe service time of casing short-connection based on this application can improve the accuracy of calculating the safe service time of casing short-connection and can provide a basis for wellbore integrity and safe operation and maintenance of injection and production wells.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0030] Figure 1 This is a flowchart illustrating a method for determining the safe service time of a bushing short circuit according to an embodiment of this application;

[0031] Figure 2 This is a block diagram of a bushing short-circuit safe service time determination device according to an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the system structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0033] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0034] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0035] 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 can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0036] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0037] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0038] The implementation details of the technical solutions in the embodiments of this application are described in detail below:

[0039] According to one aspect of this application, a method for determining the safe service time of a bushing short-circuit is provided. Figure 1The flowchart below illustrates a method for determining the safe service time of a bushing short-circuit according to an embodiment of this application. This method can be executed by a device with computational processing capabilities. The method includes at least steps 110 to 130, which are described in detail below:

[0040] In step 110, based on the current geological conditions of the injection and production well, the location of the surface water connected to the casing is determined, and the location of the surface water is set as the corrosion core location of the casing connection.

[0041] In this application, the casing joint, as a crucial component of wellbore integrity, directly impacts the safe and smooth production of oil and gas. Corrosion caused by the external environment will inevitably affect the safe production and operation of injection and production wells, and may even lead to major safety accidents. Therefore, it is necessary to analyze the core corrosion location of the casing joint in order to calculate its safe service life.

[0042] Since the casing short joint is located in an environment of surface water corrosion, the humidity and air content at the junction of the casing short joint and the surface water are relatively high. The casing short joint is prone to severe dissolved oxygen corrosion at the junction with the surface water. Based on this, the junction of the casing short joint and the surface water is set as the core location of corrosion of the casing short joint.

[0043] Continue to refer to Figure 1 In step 120, the total radial stress, total circumferential stress and total axial stress corresponding to the corrosion core position at the initial time node are calculated, thereby calculating the equivalent stress corresponding to the corrosion core position at the initial time node.

[0044] In this application, the bushing short joint is subjected to stress in different directions during corrosion. Among these, the main influencing factor on the corrosion of the bushing short joint is the equivalent stress corresponding to the corrosion core location. The calculation of the equivalent stress requires first calculating the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location.

[0045] Specifically, the total radial stress is calculated using the following formula:

[0046] σ r =σ r ′+σ r "

[0047] Where, σ r The total radial stress is given in MPa; σ is the total radial stress. r ′ represents the radial stress at the core of the corrosion at the casing short-circuit due to internal pressure and external extrusion, measured in MPa; σ represents the radial stress at the core of the corrosion at the casing short-circuit. r "This represents the radial stress (MPa) generated at the core corrosion location of the casing short circuit due to thermal action."

[0048] Furthermore, the radial stress (i.e., σ) generated at the core of the corrosion at the casing short-circuit due to internal pressure and external extrusion force... r ′) can be calculated using the following formula:

[0049]

[0050] Among them, P i The external extrusion force at the corrosion core location of the casing short circuit, MPa; P o The internal pressure at the core of the corrosion at the casing short-circuit is measured in MPa; r ci The inner radius of the casing shorting at the corrosion core location is given in mm; r co denoted as , where is the outer radius of the casing short joint at the core of the corrosion, in mm; denoted as r is the average inner and outer radii of the casing short joint at the core of the corrosion, in mm.

[0051] Furthermore, when calculating based on the inner and outer radii of the casing joint, the degree of corrosion of the casing joint is constantly changing. Therefore, for accuracy, it is necessary to calculate the inner and outer radii of the casing joint in real time. Simultaneously, the calculation of the inner and outer radii of the casing joint needs to be based on the corrosion rate of the casing joint under different materials.

[0052] For example, when the bushing connector is made of N80 material, the corrosion rate of the bushing connector can be calculated using the following formula:

[0053] cor_sp N80 =-0.0005t 4 +0.00013t 3 +0.0008t 2 +0.0016t+0.0022

[0054] Among them, cor_sp N80 t represents the corrosion rate of the casing joint in a surface water corrosive environment, in mm / year; t represents the temperature at the core of the corrosion of the casing joint, in °C.

[0055] For example, when the bushing connection is made of 110H material, the corrosion rate of the bushing connection can be calculated using the following formula:

[0056] cor_sp 110H = -0.0006t 4 +0.00131t 3 +0.0008t 2 +0.0015t+0.0022

[0057] Among them, cor_sp 110H t represents the corrosion rate of the casing joint in a surface water corrosive environment, in mm / year; t represents the temperature at the core of the corrosion of the casing joint, in °C.

[0058] For example, when the bushing connector is made of BG130TT bushing material, the corrosion rate of the bushing connector can be calculated using the following formula:

[0059] cor_sp BG130TT =-0.0013t 4 +0.00117t 3 +0.0003t 2 +0.0009t+0.0009

[0060] Among them, cor_sp BG130TT t represents the corrosion rate of the casing joint in a surface water corrosive environment, in mm / year, and t represents the temperature at the core of the corrosion of the casing joint, in °C.

[0061] Furthermore, the radial stress (i.e., σ) generated by heat at the core corrosion location of the casing short circuit r The following formula can be used to calculate:

[0062]

[0063] Where, α c The linear thermal expansion coefficient of the bushing at this time point, m / (m·℃); E c The elastic modulus of the bushing at this time point, in MPa; u c The Poisson's ratio at this time point for the casing short circuit; ΔT is the change in temperature at this time point from the initial temperature at the location of the corrosion core at the casing short circuit, in °C.

[0064] Furthermore, the calculation coefficient C in the formula for calculating the radial stress generated by thermal action at the corrosion core location of the aforementioned sleeve short-circuit is... c1 He can calculate it using the following formula:

[0065]

[0066] Among them, E f Elastic modulus of the surrounding rock at the core corrosion location of the casing short-circuit at this time point, MPa; u f The Poisson's ratio of the surrounding rock at the core corrosion location of the casing short-circuit at this time point.

[0067] The total circumferential stress is calculated using the following formula:

[0068] σ θ =σ θ ′+σθ "

[0069] Where, σ θ The total circumferential stress is expressed in MPa; σ θ ′ represents the circumferential stress at the core of the corrosion at the casing short-circuit due to internal pressure and external extrusion, in MPa; σ θ "This represents the circumferential stress (MPa) generated at the core corrosion location of the casing short circuit due to thermal action."

[0070] Furthermore, the circumferential stress (i.e., σ) generated at the core corrosion location of the aforementioned casing short-circuit is due to internal pressure and external extrusion. θ ′), can be calculated using the following formula:

[0071]

[0072] Among them, P i The external extrusion force at the corrosion core location of the casing short circuit, MPa; P o The internal pressure at the core of the corrosion at the casing short-circuit is measured in MPa; r ci The inner radius of the casing shorting at the corrosion core location is given in mm; r co denoted as , where is the outer radius of the casing short joint at the core of the corrosion, in mm; denoted as r is the average inner and outer radii of the casing short joint at the core of the corrosion, in mm.

[0073] Furthermore, the circumferential stress (i.e., σ) generated by heat at the core corrosion location of the casing short circuit θ The following formula can be used to calculate:

[0074]

[0075] Where, α c The linear thermal expansion coefficient of the bushing at this time point, m / (m·℃); E c The elastic modulus of the bushing at this time point, in MPa; u c The Poisson's ratio at this time point for the casing short circuit; ΔT is the change in temperature at this time point from the initial temperature at the location of the corrosion core at the casing short circuit, in °C.

[0076] The total axial stress is calculated using the following formula:

[0077] σ z =σ zo +σ zb +σ z ′+σ z "

[0078] Where, σ z The total axial stress is expressed in MPa; σ zoThe initial axial stress at the corrosion core location of the casing short circuit, caused by its own weight and buoyancy, is σ (MPa). zb The axial stress at the core corrosion location of the casing short circuit, caused by the bending of the tubing string, is measured in MPa; σ z ′ represents the axial stress at the core of the corrosion at the casing short-circuit due to internal pressure and external extrusion, measured in MPa; σ represents the stress at the core of the corrosion at the casing short-circuit. z "This represents the axial stress (MPa) generated at the core corrosion location of the casing short circuit due to thermal action."

[0079] Furthermore, the initial axial stress (i.e., σ) at the core corrosion location of the casing short circuit is caused by its own weight and the buoyancy it experiences. zo The result can be calculated using the following formula:

[0080] σ zo =(ρ c l c -ρ l l l )g·10 -6

[0081] Where, ρ c Density of bushing shorting, kg / m 3 ;ρ l Density of drilling mud, kg / m³ 3 ;l c The length of the casing joint from the core of the corrosion to the bottom of the well, in meters (m); l l The length of the casing short-circuit from the top of the drilling mud to the bottom of the well during well completion, in meters; g is the gravitational acceleration, taken as 9.8 N / kg.

[0082] Furthermore, the axial stress (i.e., σ) generated at the core corrosion location of the casing short circuit due to the bending of the tubing string... zb The result can be calculated using the following formula:

[0083] σ zb =0.060156D leg d is

[0084] Among them, D leg The curvature at the corrosion core location of the casing short circuit, ° / 30m; d is —Nominal inner diameter of the casing short connector body, mm.

[0085] Furthermore, the axial stress (i.e., σ) generated at the core of the corrosion at the casing short-circuit due to internal pressure and external extrusion force... z ′), can be calculated using the following formula:

[0086] σ z ′=u c (σ r ′+σθ ′)

[0087] Where, σ r ′ represents the radial stress at the core of the corrosion at the casing short-circuit due to internal pressure and external extrusion, measured in MPa; σ represents the radial stress at the core of the corrosion at the casing short-circuit. θ ′ represents the circumferential stress at the core of the corrosion at the casing short-circuit point, caused by internal pressure and external extrusion, in MPa; u c The bushing short-circuit Poisson's ratio at this time point.

[0088] Furthermore, the axial stress (i.e., σ) generated by heat at the core corrosion location of the casing short circuit z The result (") can be calculated using the following formula:

[0089]

[0090] Where, α c The linear thermal expansion coefficient of the bushing at this time point, m / (m·℃); E c The elastic modulus of the bushing at this time point, in MPa; u c The Poisson's ratio at this time point for the casing short circuit; ΔT is the change in temperature at this time point from the initial temperature at the location of the corrosion core at the casing short circuit, in °C.

[0091] The equivalent stress is calculated using the following formula:

[0092]

[0093] Where, σ equ For equivalent stress, MPa; σ r The total radial stress is given in MPa; σ is the total radial stress. θ The total circumferential stress is expressed in MPa; σ z For the total axial stress, MPa.

[0094] Continue to refer to Figure 1 In step 130, the safe service time of the bushing short connection is determined based on the equivalent stress and yield strength.

[0095] In this application, the equivalent stress at the corrosion core location of the obtained sleeve shorting is combined with the yield strength corresponding to the sleeve shorting to calculate the safe service time of the sleeve shorting.

[0096] Furthermore, after obtaining the equivalent stress and the yield strength, the method specifically includes steps 131 to 132:

[0097] Step 131: If the equivalent stress is less than the yield strength, then the next time node is taken as the new initial time node, and an accumulated node number is added. The new initial time node is separated from the previous initial time node by a unit interval time, and the initial value of the accumulated node number is zero.

[0098] Step 132: Based on the new initial time node, re-execute the step of calculating the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location at the initial time node, thereby calculating the equivalent stress corresponding to the corrosion core location at the initial time node.

[0099] In this application, after obtaining the equivalent stress and the yield strength, if the equivalent stress is less than the yield strength, it indicates that the corrosion degree of the current casing short-connection is low and will not affect the normal operation of the injection well and production well. Therefore, the next time node is used as the new initial time node, and the step of calculating the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location at the initial time node is re-executed, thereby calculating the equivalent stress corresponding to the corrosion core location at the initial time node. The new initial time node is separated from the previous initial time node by one unit interval. Furthermore, in this application, each time the step of determining whether the equivalent stress is less than the yield strength is executed, an accumulated node number needs to be added. The accumulated node number is used to calculate the safe service time of the casing short-connection, and the initial value of the accumulated node number is zero.

[0100] Furthermore, after obtaining the equivalent stress and the yield strength, the method specifically includes step 133:

[0101] Step 133: If the equivalent stress is greater than the yield strength, then calculate the safe service time of the bushing short connection based on the unit interval time and the cumulative number of nodes.

[0102] In this application, if the equivalent stress is greater than the yield strength, it indicates that the corrosion degree of the current casing short-connection is relatively large, affecting the normal operation of the injection well and the production well. Therefore, the safe service time of the casing short-connection can be calculated based on the unit interval time and the cumulative number of nodes.

[0103] Combining the above methods can improve the accuracy of calculating the safe service time of casing short-circuit connections and provide a basis for wellbore integrity and safe operation and maintenance of injection and production wells.

[0104] The following describes an embodiment of the apparatus described in this application, which can be used to execute the bushing short-circuit safe service time determination method in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the bushing short-circuit safe service time determination method described above in this application.

[0105] Figure 2 This is a block diagram of a bushing short-circuit safe service time determination device according to an embodiment of this application.

[0106] Reference Figure 2 As shown, a casing short-connection safe service time determination device 200 according to an embodiment of this application includes: a judgment unit 201, used to determine the location of surface water connected to the casing short-connection based on the current geological conditions of the injection-production well, and set the location of the surface water as the corrosion core location of the casing short-connection; a first calculation unit 202, used to calculate the total radial stress, total circumferential stress and total axial stress corresponding to the corrosion core location at an initial time node, thereby calculating the equivalent stress corresponding to the corrosion core location at the initial time node; and a second calculation unit 203, used to determine the safe service time of the casing short-connection based on the equivalent stress and yield strength.

[0107] In another aspect, this application also provides a computer-readable storage medium having a program product stored thereon capable of implementing the methods described above in this specification. In some possible implementations, various aspects of this application may also be implemented as a program product comprising program code that, when run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to the various exemplary embodiments of this application.

[0108] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0109] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0110] Program code for performing the operations of this application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0111] In another respect, this application also provides an electronic device capable of implementing the above-described method.

[0112] Those skilled in the art will understand that various aspects of this application can be implemented as a system, method, or program product. Therefore, various aspects of this application can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, collectively referred to herein as a "circuit," "module," or "system."

[0113] Figure 3 This is a schematic diagram of the system structure of an electronic device according to an embodiment of this application. Referring below... Figure 3 To describe an electronic device 300 according to this embodiment of the present application. Figure 3 The electronic device 300 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0114] like Figure 3 As shown, the electronic device 300 is manifested in the form of a general-purpose 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 storage unit 320 and processing unit 310).

[0115] The storage unit stores program code that can be executed by the processing unit 310, causing the processing unit 310 to perform the steps described in the "Embodiment Methods" section above according to various exemplary embodiments of this application.

[0116] Storage unit 320 may include readable media in the form of volatile storage units, such as random access memory (RAM) 321 and / or cache memory 322, and may further include read-only memory (ROM) 323.

[0117] Storage unit 320 may also include a program / utility 324 having a set (at least one) of program modules 325, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0118] Bus 330 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0119] Electronic device 300 can also communicate with one or more external devices 1200 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 300, and / or with any device that enables electronic device 300 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 350. Furthermore, electronic device 300 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 360. As shown, network adapter 360 communicates with other modules of electronic device 300 via bus 330. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with 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.

[0120] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the method according to the embodiments of this application.

[0121] Furthermore, the above figures are merely illustrative of the processes included in the method according to exemplary embodiments of this application, and are not intended to be limiting. It is readily understood that the processes shown in the above figures do not indicate or limit the temporal order of these processes. Additionally, it is readily understood that these processes may be executed synchronously or asynchronously, for example, in multiple modules.

[0122] It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for determining the safe service time of a bushing short-circuit, characterized in that, The method includes: Based on the current geological conditions of the injection and production wells, determine the location of the surface water that is short-connected to the casing, and set the location of the surface water as the core location of the corrosion of the casing short connection. Calculate the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location at the initial time node, and then calculate the equivalent stress corresponding to the corrosion core location at the initial time node; If the equivalent stress is less than the yield strength, then the next time node is taken as the new initial time node, and the cumulative node count is increased by one. The new initial time node is separated from the previous initial time node by one unit interval time, and the initial value of the cumulative node count is zero. Based on the new initial time node, the steps of recalculating the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location at the initial time node are performed again, thereby calculating the equivalent stress corresponding to the corrosion core location at the initial time node. If the equivalent stress is greater than the yield strength, then the safe service time of the bushing short circuit is calculated based on the unit interval time and the cumulative number of nodes. The total radial stress is calculated using the following formula: ； ； ； in, The total radial stress is expressed in MPa. The radial stress at the core corrosion location of the casing short circuit, caused by internal pressure and external extrusion, is measured in MPa. The radial stress (MPa) is generated at the core corrosion location of the casing short circuit due to thermal action. The external extrusion force at the corrosion core location of the casing short circuit, MPa; The internal pressure at the core corrosion location of the casing short circuit, in MPa; The inner radius of the bushing short-circuit at the core corrosion location is given in mm. The outer radius of the casing short-circuit at the core corrosion location is given in mm. The value is the average inner and outer radii of the casing short-circuit at the core of the corrosion. (mm) The linear thermal expansion coefficient of the bushing short circuit at the current time point is given in m / (m·℃). The elastic modulus of the bushing short-circuit at the current time point, in MPa; The Poisson's ratio of the bushing short circuit at the current time point; The change in temperature at the core corrosion location of the casing short circuit between the initial temperature and the current time point is expressed in °C. The total circumferential stress is calculated using the following formula: ； ； in, The total circumferential stress is expressed in MPa. The circumferential stress at the core corrosion location of the casing short circuit, caused by internal pressure and external extrusion, is measured in MPa. The circumferential stress (MPa) is generated at the core corrosion location of the casing short circuit due to thermal action. The external extrusion force at the corrosion core location of the casing short circuit, MPa; The internal pressure at the core corrosion location of the casing short circuit, in MPa; The inner radius of the bushing short-circuit at the core corrosion location is given in mm. The outer radius of the casing short-circuit at the core corrosion location is given in mm. The value is the average inner and outer radii of the casing short-circuit at the core of the corrosion. (mm) The linear thermal expansion coefficient of the bushing short circuit at the current time point is given in m / (m·℃). The elastic modulus of the bushing short-circuit at the current time point, in MPa; The Poisson's ratio of the bushing short circuit at the current time point; The change in temperature at the core corrosion location of the casing short circuit between the initial temperature and the current time point is expressed in °C. The total axial stress is calculated using the following formula: in, The total axial stress is expressed in MPa. The initial axial stress at the core corrosion location of the casing short circuit, caused by its own weight and buoyancy, is measured in MPa. The axial stress (MPa) is generated at the core corrosion location of the casing short circuit due to the bending of the tubing. The axial stress at the core corrosion location of the casing short circuit, caused by internal pressure and external extrusion, is measured in MPa. The axial stress (MPa) is generated at the core corrosion location of the casing short circuit due to thermal action. The equivalent stress is calculated using the following formula: in, The equivalent stress is expressed in MPa. The total radial stress is expressed in MPa. The total circumferential stress is expressed in MPa. For the total axial stress, MPa.

2. A device for determining the safe service time of a bushing short-circuit, characterized in that, The device includes: The judgment unit is used to determine the location of the surface water connected to the casing based on the current geological conditions of the injection and production well, and to set the location of the surface water as the corrosion core location of the casing connection. The first calculation unit is used to calculate the total radial stress, total circumferential stress and total axial stress corresponding to the corrosion core position at the initial time node, thereby calculating the equivalent stress corresponding to the corrosion core position at the initial time node. The second calculation unit is used to, if the equivalent stress is less than the yield strength, take the next time node as the new initial time node and increase the cumulative node count by one unit interval time between the new initial time node and the previous initial time node, and the initial value of the cumulative node count is zero. Based on the new initial time node, the steps of recalculating the total radial stress, total circumferential stress, and total axial stress corresponding to the corrosion core location at the initial time node are performed again, thereby calculating the equivalent stress corresponding to the corrosion core location at the initial time node. If the equivalent stress is greater than the yield strength, then the safe service time of the bushing short circuit is calculated based on the unit interval time and the cumulative number of nodes. The total radial stress is calculated using the following formula: ； ； ； in, The total radial stress is expressed in MPa. The radial stress at the core corrosion location of the casing short circuit, caused by internal pressure and external extrusion, is measured in MPa. The radial stress (MPa) is generated at the core corrosion location of the casing short circuit due to thermal action. The external extrusion force at the corrosion core location of the casing short circuit, MPa; The internal pressure at the core corrosion location of the casing short circuit, in MPa; The inner radius of the bushing short-circuit at the core corrosion location is given in mm. The outer radius of the casing short-circuit at the core corrosion location is given in mm. The value is the average inner and outer radii of the casing short-circuit at the core of the corrosion. (mm) The linear thermal expansion coefficient of the bushing short circuit at the current time point is given in m / (m·℃). The elastic modulus of the bushing short-circuit at the current time point, in MPa; The Poisson's ratio of the bushing short circuit at the current time point; The change in temperature at the core corrosion location of the casing short circuit between the initial temperature and the current time point is expressed in °C. The total circumferential stress is calculated using the following formula: ； ； in, The total circumferential stress is expressed in MPa. The circumferential stress at the core corrosion location of the casing short circuit, caused by internal pressure and external extrusion, is measured in MPa. The circumferential stress (MPa) is generated at the core corrosion location of the casing short circuit due to thermal action. The external extrusion force at the corrosion core location of the casing short circuit, MPa; The internal pressure at the core corrosion location of the casing short circuit, in MPa; The inner radius of the bushing short-circuit at the core corrosion location is given in mm. The outer radius of the casing short-circuit at the core corrosion location is given in mm. The value is the average inner and outer radii of the casing short-circuit at the core of the corrosion. (mm) The linear thermal expansion coefficient of the bushing short circuit at the current time point, m / (m·℃); The elastic modulus of the bushing short-circuit at the current time point, in MPa; The Poisson's ratio of the bushing short circuit at the current time point; The change in temperature at the core corrosion location of the bushing short circuit between the initial temperature and the current time point, in °C; The total axial stress is calculated using the following formula: in, The total axial stress is expressed in MPa. The initial axial stress at the core corrosion location of the casing short circuit, caused by its own weight and buoyancy, is measured in MPa. The axial stress (MPa) is generated at the core corrosion location of the casing short circuit due to the bending of the tubing. The axial stress at the core corrosion location of the casing short circuit, caused by internal pressure and external extrusion, is measured in MPa. The axial stress (MPa) is generated at the core corrosion location of the casing short circuit due to thermal action. The equivalent stress is calculated using the following formula: in, The equivalent stress is expressed in MPa. The total radial stress is expressed in MPa. The total circumferential stress is expressed in MPa. For the total axial stress, MPa.

3. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one piece of program code, which is loaded and executed by a processor to perform the operations described in claim 1.

4. An electronic device, characterized in that, The electronic device includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to perform the operation performed by the method as described in claim 1.

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