Methods, apparatus, equipment and storage medium for determining the stiffness ratio of drill string casing

Abstract

This invention discloses a method, apparatus, device, and storage medium for determining the drill string casing stiffness ratio. The method includes: determining the equivalent moment of inertia of each first segment in the drill string assembly, wherein each first segment is determined based on the position of a centralizer in the drill string assembly, each first segment does not include a centralizer, and at least one end is used to connect to a corresponding centralizer; determining the equivalent stiffness of the drill string assembly based on the equivalent moment of inertia of each first segment, the moment of inertia of each centralizer, and the length of each second segment, wherein each second segment is determined based on the position of a centralizer in the drill string assembly, and a subsequent second segment includes a previous second segment and a centralizer or a first segment connected to the end of the previous second segment; determining the equivalent stiffness of the target casing; and determining the drill string casing stiffness ratio based on the equivalent stiffness of the drill string assembly and the equivalent stiffness of the target casing. This invention can improve the accuracy of the drill string casing stiffness ratio by improving the accuracy of the equivalent stiffness of the drill string assembly.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration technology, and in particular to a method, apparatus, equipment and storage medium for determining the stiffness ratio of drill string casing. Background Technology

[0002] Well completion operations typically include casing installation and cementing. After drilling the open hole, factors such as irregular wellbore, steps, salt deposits, and shale formations can obstruct casing installation, sometimes even leading to casing failure and subsequent pull-out accidents, impacting operational efficiency. Using a suitable drill string assembly during drilling or well cleaning is crucial for ensuring successful casing installation. The drill string assembly used for drilling or well cleaning must fully consider the geological and engineering characteristics of the open hole section and the size, stiffness, and length of the subsequent casing. Generally, when the designed drill string assembly stiffness is greater than that of the subsequent casing, theoretically, the casing is more flexible and easier to run to the completed well depth.

[0003] Therefore, a drilling tool assembly with a casing stiffness ratio greater than 1 is usually used as the standard for the preferred drilling tool assembly. Under the premise of ensuring safe operation, the larger this ratio is, the lower the risk of the casing being obstructed after drilling or well cleaning is completed.

[0004] Currently, there is no unified method for evaluating the stiffness ratio of drill string and casing. Inaccurate calculation of the stiffness ratio of drill string assembly can lead to an unreasonable evaluation of the stiffness ratio of drill string and casing, resulting in obstruction during casing installation or even casing pull-out accidents. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and storage medium for determining the drill string casing stiffness ratio, in order to solve the problem of low accuracy in determining the drill string casing stiffness ratio in the prior art.

[0006] According to one aspect of the present invention, a method for determining the stiffness ratio of a drill string casing is provided, comprising: Determine the equivalent moment of inertia of each first section in the drill string assembly, wherein each first section is determined based on the position of the centralizer in the drill string assembly, each first section does not include a centralizer, and at least one end is used to connect to the corresponding centralizer. The equivalent stiffness of the drill string assembly is determined based on the equivalent moment of inertia of each first section, the moment of inertia of each stabilizer, and the length of each second section. Each second section is determined based on the position of the stabilizer in the drill string assembly. Each subsequent second section includes the preceding second section and a stabilizer or a first section connected to the end of the preceding second section. Determine the equivalent stiffness of the target sleeve; The drill string-casing stiffness ratio is determined based on the equivalent stiffness of the drill string assembly and the equivalent stiffness of the target casing.

[0007] According to another aspect of the present invention, a drill string casing stiffness ratio determination device is provided, comprising: An equivalent moment of inertia module is used to determine the equivalent moment of inertia of each first section in the drill string assembly, wherein each first section is determined based on the position of the stabilizer in the drill string assembly, each first section does not include a stabilizer, and at least one end is used to connect to the corresponding stabilizer. The first equivalent stiffness module is used to determine the equivalent stiffness of the drill string assembly based on the equivalent moment of inertia of each first section, the moment of inertia of each stabilizer, and the length of each second section. Each second section is determined based on the position of the stabilizer in the drill string assembly. Each subsequent second section includes the preceding second section and a stabilizer or a first section connected to the end of the preceding second section. The second equivalent stiffness module is used to determine the equivalent stiffness of the target sleeve; The stiffness ratio module is used to determine the drill string-casing stiffness ratio based on the equivalent stiffness of the drill string assembly and the equivalent stiffness of the target casing.

[0008] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the drill string casing stiffness ratio determination method according to any embodiment of the present invention.

[0009] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the drill string casing stiffness ratio determination method according to any embodiment of the present invention.

[0010] The technical solution provided by the embodiments of the present invention simplifies the structure of the drill string assembly by determining the equivalent moment of inertia of each first section and converting each drill string in each first section into a drill string with the same cross-section. Based on the equivalent moment of inertia of each first section, the moment of inertia of the stabilizer, and the length of each second section, the equivalent stiffness of the drill string assembly is determined, and the influence of the stabilizer on the equivalent stiffness of the drill string assembly is accurately quantified, thereby improving the accuracy of the determined equivalent stiffness of the drill string assembly.

[0011] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a flowchart of a method for determining the stiffness ratio of drill string casing according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the first segment provided according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the second segment provided according to an embodiment of the present invention; Figure 4A This is another flowchart of the method for determining the stiffness ratio of drill string casing provided in the embodiments of the present invention; Figure 4B This is a schematic diagram of the third segmentation method provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the equivalent stiffness of each first section, the equivalent stiffness of each stabilizer, and the equivalent stiffness of the drill string assembly according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the drill string casing stiffness ratio determination device provided in an embodiment of the present invention; Figure 7 This is another structural schematic diagram of the drill string casing stiffness ratio determination device provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of an electronic device for implementing the method for determining the stiffness ratio of the drill string casing according to an embodiment of the present invention. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0015] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0016] Figure 1 This is a flowchart of a method for determining the drill string casing stiffness ratio provided in an embodiment of the present invention. This embodiment is applicable to situations where the drill string casing stiffness ratio is determined. This method can be executed by a drill string casing stiffness ratio determining device, which can be implemented in hardware and / or software, and can be configured in the processor of an electronic device. Figure 1 As shown, the method includes: S110. Determine the equivalent moment of inertia of each first section in the drill string assembly, wherein each first section is determined based on the position of the centralizer in the drill string assembly, each first section does not include a centralizer, and at least one end is used to connect to the corresponding centralizer.

[0017] Among them, the centralizer, also known as the stabilizer, is a tool used to stabilize downhole drilling tools and prevent deviation. It is a device connected to a section of the drill string with a larger outer diameter drill string, used to stabilize the drilling direction. It is an important drilling tool in oil, gas and geological exploration drilling projects to prevent well deviation changes and ensure stable drilling.

[0018] In one embodiment, the equivalent moment of inertia of the first segment is determined using an equivalent moment of inertia determination method.

[0019] The method for determining the first section includes: using the centralizer in the drill string assembly as a separator, designating one end connected to the drill bit as the front end, and the other end as the rear end. The portion of the drill string assembly between two adjacent centralizers is considered as one first section, and the portion of the drill string assembly between the first centralizer and the drill bit is also considered as one first section. See [link to relevant documentation]. Figure 2 .

[0020] S120. Determine the equivalent stiffness of the drill string assembly based on the equivalent moment of inertia of each first section, the moment of inertia of each stabilizer, and the length of each second section, wherein each second section is determined based on the position of the stabilizer in the drill string assembly, and a subsequent second section includes a previous second section, and a stabilizer or a first section connected to the end of the previous second section.

[0021] In one embodiment, the method for determining the second segment includes: determining a target end in the drill string assembly that is connected to the drill bit; for each of the stabilizers, taking the portion between the target end and the starting end of the current stabilizer as a second segment, and taking the portion between the target end and the end of the current stabilizer as another second segment, wherein the starting end of the current stabilizer is the end of the current stabilizer facing the drill bit.

[0022] Specifically, such as Figure 3 As shown, the left end of the drill string assembly is the target end connected to the drill bit. The bolded line segment in the figure represents the centralizer. For any centralizer, its left end is defined as the starting end of the centralizer. The portion between the target end and the starting end of the current centralizer is considered as a second segment, and the portion between the target end and the end of the current centralizer is considered as another second segment. It can be seen that, based on the two second segments determined by the current centralizer, the latter second segment includes the former second segment and a centralizer connected to the end of the former second segment; corresponding to two adjacent second segments of different centralizers, the latter second segment includes the former second segment and a first segment connected to the end of the former second segment. Specifically, regarding the appendix... Figure 3 The second section marked L2 has an additional stabilizer (1) compared to the second section marked L1; the second section marked L4 has an additional stabilizer (2) compared to the second section marked L3; and so on, the second section marked L... 2n The second section compared to the one marked L 2n-1 The second section has an additional stabilizer (n).

[0023] It should be noted that for two or more identical drill bits connected together, in determining the equivalent stiffness of the first section, they can be calculated independently or as a whole drill bit.

[0024] The equivalent stiffness of the drill string assembly is determined using the following formula: (1) in, E e The elastic modulus of the drill bit is expressed in Pa. The equivalent moment of inertia of the drill string assembly. To be identified as iThe equivalent moment of inertia of the drill string, in meters. 4 The drill string is either the first section or a centralizer; For the first i The length data of the second segment is given in meters (m), where n is the total number of second segments. The length data of the (n+1)th second segment is used to calculate the length of the last second segment of the drill string assembly, which can be specifically expressed as follows: L i+1 = , This represents the length of the (i+1)th second segment, in meters. L 0=0, I 0 = 0; This refers to the length of the drill string, in meters (m).

[0025] S130. Determine the equivalent stiffness of the target sleeve.

[0026] The equivalent stiffness of the target casing is determined using the following formulas, including: (2) Among them, E c The elastic modulus of the target sleeve is expressed in Pa. The target sleeve moment of inertia, in meters. 4 ;D c For the target casing outer diameter data, d c The target casing inner diameter data is provided, and both are in meters (m).

[0027] S140. Determine the drill string-casing stiffness ratio based on the equivalent stiffness of the drill string assembly and the equivalent stiffness of the target casing.

[0028] The ratio of the equivalent stiffness of the drill string assembly to the equivalent stiffness of the target casing can be expressed as: (3) In one embodiment, the matching result between the target casing and the drill string assembly is determined based on the drill string stiffness ratio. This matching result includes matching failure and matching success. Matching failure indicates that the current drill string assembly is not suitable for use with the target casing; matching success indicates that the current drill string assembly can be used with the target casing. This embodiment achieves automatic and accurate determination of the matching result between the target casing and the drill string assembly, improving the speed of the drilling preparation process and the safety of subsequent drilling operations.

[0029] For a specific ultra-deep well, the drilling depth is set at 3600m, the wellbore size is 593.73mm, and the completion plan is to run a target casing with an outer diameter of 492.13mm and an inner diameter of 450.13mm. During the preliminary preparation phase, five drilling tool assemblies were designed for this well. The specific parameters of the first drilling tool assembly are as follows: Table 1 Parameters of the First Drill String Assembly The set includes drill string numbers, which are the numbers of the drill strings within the corresponding drill string assembly. The first drill string assembly is divided into two first sections and four second sections. The first first section includes drill strings numbered 2-6, and the second first section includes drill strings numbered 8. The first second section includes drill strings numbered 2-6, the second second section includes drill strings numbered 2-7, the third second section includes drill strings numbered 2-8, and the fourth second section includes drill strings numbered 2-9.

[0030] The equivalent stiffness ratio of the first set of drill string assembly was calculated using the above formula (3), and the result was 1.7641.

[0031] Table 2 Parameters of the Second Drill String Assembly The equivalent stiffness ratio of the second set of drill string assembly was calculated using the above formula (3), and the result was 1.5276.

[0032] Table 3 Parameters of the Third Drill String Assembly The equivalent stiffness of the third set of drill string assembly was calculated using the above formula (3), and the result was 0.8738.

[0033] Table 4 Parameters of the Fourth Drill String Assembly The equivalent stiffness ratio of the fourth set of drill bit assembly was calculated using the above formula (3), and the result was 1.5991.

[0034] Table 5 Parameters of the Fifth Drill String Assembly The equivalent stiffness ratio of the fifth set of drill string assembly was calculated using the above formula (3), and the result was 1.5991.

[0035] Since the drill string and casing stiffness ratio of the first drill string assembly (1.7641) is greater than that of other drill string assemblies, the first drill string assembly is the most effective when used in conjunction with the target casing.

[0036] The technical solution provided by the embodiments of the present invention simplifies the structure of the drill string assembly by determining the equivalent moment of inertia of each first section and converting each drill string in each first section into a drill string with the same cross-section. Based on the equivalent moment of inertia of each first section, the moment of inertia of the stabilizer, and the length of each second section, the equivalent stiffness of the drill string assembly is determined, and the influence of the stabilizer on the equivalent stiffness of the drill string assembly is accurately quantified, thereby improving the accuracy of the determined equivalent stiffness of the drill string assembly.

[0037] Figure 4A This is another flowchart of the method for determining the stiffness ratio of the drill string casing provided in this embodiment of the invention. This embodiment is used to refine the steps for determining the equivalent stiffness of the drill string assembly section in the aforementioned embodiments. Figure 4A As shown, the method includes: S2101. Determine the equivalent stiffness of each of the first segments.

[0038] In one embodiment, for each first segment, the equivalent stiffness of the current first segment is determined based on the length of the current first segment, the moment of inertia of each drill bit in the current first segment, and the length of each corresponding third segment, wherein a subsequent third segment includes a previous third segment and a drill bit connected to the end of the previous third segment, and the number of third segments is equal to the number of drill bits included in the current first segment.

[0039] Figure 4B This is a schematic diagram of the third segment division method provided in an embodiment of the present invention. The rectangles at the top of the diagram represent drilling tools. Drill tool 1 is located at the beginning of the first segment, and drilling tool n is located at the end of the first segment. The specific method for determining the third segment is as follows: for each first segment, the first drilling tool of the current first segment is taken as one third segment; the first two drilling tools of the current first segment are taken as another third segment; the first three drilling tools of the current first segment are taken as another third segment, and so on, until the first m drilling tools of the current first segment are taken as yet another third segment. The end of the current first segment facing the drill bit is taken as the beginning of the current first segment.

[0040] The equivalent stiffness of the current first segment is determined using the following formula: ; in, E The elastic modulus of the current first section of the drill string, in Pa. For the first segment in the current first segment i The moment of inertia of a drill string, in meters. 4 Specifically, this can be expressed as: , The equivalent moment of inertia for the current first segment is expressed in meters (m). 4 , and The first segment is respectively the first segment in the current first segment i Outer and inner diameter data of each drill bit For the first segment in the current section i The length data of the third segment is set. L n+1 = , This represents the length of the current first segment.

[0041] Because the first section and the centralizer are distributed alternately, therefore Figure 5 The equivalent stiffness corresponding to the moment of inertia with an odd subscript represents the equivalent stiffness of the first segment, while the equivalent stiffness corresponding to the moment of inertia with an even subscript represents the equivalent stiffness of the centralizer.

[0042] S2102. Determine the equivalent moment of inertia of each of the first segments based on the equivalent stiffness of each of the first segments.

[0043] Optionally, the cross-sections of each drill bit in the first section are set to be the same, and the equivalent moment of inertia of each first section is determined based on the equivalent stiffness of each first section.

[0044] If the cross-sections of each drill string in the first section are the same, then the moment of inertia of each drill string is the same. Therefore, this step aims to make each drill string in the first section equivalent to a drill string with the same moment of inertia and the same inner and outer diameter, so as to simplify the structure of each non-centralizer section in the drill string assembly.

[0045] S220. Determine the equivalent stiffness of the drill string assembly based on the equivalent moment of inertia of each first section, the moment of inertia of each stabilizer, and the length of each second section, wherein each second section is determined based on the position of the stabilizer in the drill string assembly, and each subsequent second section includes the preceding second section, and a stabilizer or a first section connected to the end of the preceding second section.

[0046] in, Figure 5 EI in e The equivalent stiffness of the drill string assembly is determined based on the equivalent moment of inertia of each of the first sections, the moment of inertia of each of the centralizers, and the length of each of the second sections.

[0047] S230. Determine the equivalent stiffness of the target sleeve.

[0048] S240. Determine the drill string-casing stiffness ratio based on the equivalent stiffness of the drill string assembly and the equivalent stiffness of the target casing.

[0049] In this embodiment of the invention, each drill string in each first section is equivalent to the same moment of inertia, so as to simplify the structure of the non-centralizer section in the drill string assembly, thereby simplifying the structure of the drill string assembly and improving the accuracy of the determined equivalent stiffness of the drill string assembly.

[0050] Figure 6 This is a schematic diagram of the drill string casing stiffness ratio determination device provided in an embodiment of the present invention. Figure 6 As shown, the device includes: The equivalent moment of inertia module 41 is used to determine the equivalent moment of inertia of each first section in the drill string assembly, wherein each first section is determined based on the position of the stabilizer in the drill string assembly, each first section does not include a stabilizer, and at least one end is used to connect to the corresponding stabilizer. The first equivalent stiffness module 42 is used to determine the equivalent stiffness of the drill string assembly based on the equivalent moment of inertia of each first section, the moment of inertia of each centralizer, and the length of each second section. Each second section is determined based on the position of the centralizer in the drill string assembly. Each subsequent second section includes the preceding second section and a centralizer or a first section connected to the end of the preceding second section. The second equivalent stiffness module 43 is used to determine the equivalent stiffness of the target sleeve; The stiffness ratio module 44 is used to determine the drill string-casing stiffness ratio based on the equivalent stiffness of the drill string assembly and the equivalent stiffness of the target casing.

[0051] In one embodiment, the equivalent moment of inertia module 41 includes: Equivalent stiffness element, used to determine the equivalent stiffness of each of the first segments; An equivalent moment of inertia element is used to determine the equivalent moment of inertia of each of the first segments based on the equivalent stiffness of each of the first segments.

[0052] In one embodiment, the equivalent moment of inertia unit is used for: Assuming that all drill bits in the first section have the same cross-section, the equivalent moment of inertia of each first section is determined based on the equivalent stiffness of each first section.

[0053] In one embodiment, the equivalent stiffness element is specifically used for: For each of the first segments, the equivalent stiffness of the current first segment is determined based on the moment of inertia of each drill bit in the current first segment and the length of each corresponding third segment. The subsequent third segment includes the previous third segment and a drill bit connected to the end of the previous third segment. The number of third segments is equal to the number of drill bits included in the current first segment.

[0054] In one embodiment, the first equivalent stiffness module 42 is specifically used for: The equivalent stiffness of the current first segment is determined by the following formula: ; in, E The elastic modulus of the drill string in the current first section is... For the first segment in the current first segment i The moment of inertia of a drilling tool; specifically, it can be expressed as, , The equivalent moment of inertia of the current first segment, and The first segment is respectively the first segment in the current first segment i Outer and inner diameter data of each drill bit For the first segment in the current section i The length data of the third segment is set. L n+1 = , This represents the length of the current first segment.

[0055] In one embodiment, the second equivalent stiffness module 43 is specifically used for: The equivalent stiffness of the target casing is determined using the following formula: ; in, E Let the elastic modulus of the target sleeve be . For the target sleeve moment of inertia, For the target casing length data, D c For the target casing outer diameter data, d c The target casing inner diameter data.

[0056] In one embodiment, such as Figure 7 As shown, the device also includes a matching module 45, which is used for: The matching result between the target casing and the drill string assembly is determined based on the drill string casing stiffness ratio.

[0057] The technical solution provided by the embodiments of the present invention simplifies the structure of the drill string assembly by determining the equivalent moment of inertia of each first section and converting each drill string in each first section into a drill string with the same cross-section. Based on the equivalent moment of inertia of each first section, the moment of inertia of the stabilizer, and the length of each second section, the equivalent stiffness of the drill string assembly is determined, and the influence of the stabilizer on the equivalent stiffness of the drill string assembly is accurately quantified, thereby improving the accuracy of the determined equivalent stiffness of the drill string assembly.

[0058] The drill string casing stiffness ratio determination device provided in this embodiment of the invention can execute the drill string casing stiffness ratio determination method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0059] Figure 8 A schematic diagram of an electronic device 10, which can be used to implement embodiments of the present invention, is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0060] like Figure 8 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0061] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0062] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the method for determining the stiffness ratio of drill casing.

[0063] In some embodiments, the drill string casing stiffness ratio determination method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or mounted on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the drill string casing stiffness ratio determination method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the drill string casing stiffness ratio determination method by any other suitable means (e.g., by means of firmware).

[0064] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0065] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0066] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0067] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0068] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0069] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0070] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0071] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for determining the stiffness ratio of drill string casing, characterized in that, include: Determine the equivalent moment of inertia of each first section in the drill string assembly, wherein each first section is determined based on the position of the centralizer in the drill string assembly, each first section does not include a centralizer, and at least one end is used to connect to the corresponding centralizer. The equivalent stiffness of the drill string assembly is determined based on the equivalent moment of inertia of each first section, the moment of inertia of each stabilizer, and the length of each second section. Each second section is determined based on the position of the stabilizer in the drill string assembly. Each subsequent second section includes the preceding second section and a stabilizer or a first section connected to the end of the preceding second section. Determine the equivalent stiffness of the target sleeve; The drill string-casing stiffness ratio is determined based on the equivalent stiffness of the drill string assembly and the equivalent stiffness of the target casing. The determination of the equivalent moment of inertia of each first section in the drill string assembly includes: Determine the equivalent stiffness of each of the first segments; Assuming that all drill bits in the first section have the same cross-section, the equivalent moment of inertia of each first section is determined based on the equivalent stiffness of each first section.

2. The method according to claim 1, characterized in that, Determining the equivalent stiffness of each of the first segments includes: For each of the first segments, the equivalent stiffness of the current first segment is determined based on the length of the current first segment, the moment of inertia of each drill bit in the current first segment, and the length of each corresponding third segment. The subsequent third segment includes the previous third segment and a drill bit connected to the end of the previous third segment. The number of third segments is equal to the number of drill bits included in the current first segment.

3. The method according to claim 2, characterized in that, The step of determining the equivalent stiffness of the current first segment based on the length of the current first segment, the moment of inertia of each drill bit in the current first segment, and the length of each corresponding third segment includes: The equivalent stiffness of the current first segment is determined by the following formula: ； in, E The elastic modulus of the drill string in the current first section is... For the first segment in the current first segment i The moment of inertia of a drilling tool; specifically, it can be expressed as, , The equivalent moment of inertia of the current first segment, and The first segment is respectively the first segment in the current first segment i Outer and inner diameter data of each drill bit For the first segment in the current section i The length data of the third section drill string is set. L n+1 = , The length of the current first segment.

4. The method according to claim 1, characterized in that, Determining the equivalent stiffness of the target sleeve includes: The equivalent stiffness of the target casing is determined using the following formula: ； in, E c Let the elastic modulus of the target sleeve be . For the target sleeve moment of inertia, D c For the target casing outer diameter data, d c The target casing inner diameter data.

5. The method according to claim 1, characterized in that, Also includes: The matching result between the target casing and the drill string assembly is determined based on the drill string casing stiffness ratio.

6. A device for determining the stiffness ratio of drill casing, characterized in that, include: An equivalent moment of inertia module is used to determine the equivalent moment of inertia of each first section in the drill string assembly, wherein each first section is determined based on the position of the stabilizer in the drill string assembly, each first section does not include a stabilizer, and at least one end is used to connect to the corresponding stabilizer. The first equivalent stiffness module is used to determine the equivalent stiffness of the drill string assembly based on the equivalent moment of inertia of each first section, the moment of inertia of each stabilizer, and the length of each second section. Each second section is determined based on the position of the stabilizer in the drill string assembly. Each subsequent second section includes the preceding second section and a stabilizer or a first section connected to the end of the preceding second section. The second equivalent stiffness module is used to determine the equivalent stiffness of the target sleeve; The stiffness ratio module is used to determine the drill string-casing stiffness ratio based on the equivalent stiffness of the drill string assembly and the equivalent stiffness of the target casing. Specifically, the equivalent moment of inertia module is used for: Determine the equivalent stiffness of each of the first segments; Assuming that all drill bits in the first section have the same cross-section, the equivalent moment of inertia of each first section is determined based on the equivalent stiffness of each first section.

7. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the drill string casing stiffness ratio determination method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the method for determining the drill string casing stiffness ratio as described in any one of claims 1-5.

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