Well depth data correction method, system, equipment and medium

Abstract

The invention relates to the technical field of well logging, in particular to a well depth data correction method, system and device and a medium. Comprising the following steps: acquiring a well depth-inner diameter broken line graph constructed by first well depth data and inner diameter data of a to-be-detected tubular column, and acquiring a well depth-wall thickness broken line graph constructed by second well depth data and wall thickness data of the to-be-detected tubular column; a first well depth sequence at the inner diameter peak value of each pipe section is extracted from the well depth-inner diameter broken line graph, and a second well depth sequence at the wall thickness peak value of each pipe section is extracted from the well depth-wall thickness broken line graph; third well depth data corresponding to a positioning short section are determined in the well depth-wall thickness broken line graph, the difference value between the third well depth data and preset well depth data is determined, and second well depth data are corrected based on the difference value, the first well depth sequence and the second well depth sequence. According to the scheme, the purposes of improving the accuracy of the position information of the tubular column and facilitating the correctness and reliability of safety evaluation of the tubular column can be achieved.

Description

Background Art

[0002] In order to ensure the integrity of the wellbore of oil and gas wells, it is necessary to log the full depth of the oil and gas well string and perform strength calculation and safety verification. At present, the commonly used logging method for the string is to use a multi-arm caliper to measure the inner diameter of the string and use electromagnetic flaw detection to measure the wall thickness of the string. The multi-arm caliper logging and electromagnetic logging are carried out twice, and the well depth-inner diameter big data and well depth-wall thickness big data can be obtained respectively. Since the two instruments are not tested in the same trip, the two columns of well depth data in the well depth-inner diameter big data and the well depth-wall thickness big data are inconsistent, resulting in the inner diameter and wall thickness of the same section of the string not matching. In addition, the multi-arm caliper downhole test has an instrument to calibrate the well depth, and the obtained string well depth value is true, while the electromagnetic logging has a deviation in the string well depth value obtained because the well depth is not corrected. Therefore, the wall thickness corresponding to the well depth data of the electromagnetic logging is not true, and the well depth data formed by the multi-arm caliper logging and the electromagnetic logging do not match, resulting in the untrue safety evaluation of the string. Summary of the invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the prior art, specifically to address the problems of unreality and mismatch of well logging data, and to provide a correction method, system, device and medium for well depth data, as follows:

[0004] 1) In the first aspect, the present invention provides a method for correcting well depth data, and the specific technical solution is as follows:

[0005] S1, obtaining a well depth-inner diameter line graph constructed by first well depth data and inner diameter data of the pipe string to be tested, and obtaining a well depth-wall thickness line graph constructed by second well depth data and wall thickness data of the pipe string to be tested;

[0006] S2, extracting a first well depth sequence at the inner diameter peak of each pipe section from the well depth-inner diameter line graph, and extracting a second well depth sequence at the wall thickness peak of each pipe section from the well depth-wall thickness line graph;

[0007] S3, determining the third well depth data corresponding to the positioning pup joint in the well depth-wall thickness line graph, and determining the difference between the third well depth data and the preset well depth data, and correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence.

[0008] The beneficial effects of the well depth data correction method provided by the present invention are as follows:

[0009] The double-peak value of the positioning pup joint and the triple-peak value of the coupling are used to adjust the well depth, so that the well depth in the well depth-wall thickness big data obtained by electromagnetic logging is as close to the real value as possible, which improves the accuracy of the string position information and is beneficial to the correctness and reliability of the string safety evaluation.

[0010] Based on the above solution, the present invention can also be improved as follows.

[0011] Furthermore, the first well depth data and the inner diameter data are measured by a 40-arm logging instrument.

[0012] Furthermore, the second well depth data and the wall thickness data are measured by an electromagnetic logging instrument.

[0013] Further, the process of correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence is:

[0014] The well depth sequence number corresponding to the positioning sub is determined in the second well depth sequence, and the well depth sequence number is used as a dividing point. The second well depth data is corrected forward or backward according to the correction data with every three peaks as a group, and the correction data is determined by the difference.

[0015] 2) In the second aspect, the present invention also provides a correction system for well depth data, and the specific technical solution is as follows:

[0016] The acquisition module is used to: acquire a well depth-inner diameter line graph constructed by first well depth data and inner diameter data of the pipe string to be tested, and acquire a well depth-wall thickness line graph constructed by second well depth data and wall thickness data of the pipe string to be tested;

[0017] The extraction module is used to: extract a first well depth sequence at the inner diameter peak of each pipe section in the well depth-inner diameter broken line graph, and extract a second well depth sequence at the wall thickness peak of each pipe section in the well depth-wall thickness broken line graph;

[0018] The correction module is used to: determine the third well depth data corresponding to the positioning short joint in the well depth-wall thickness line graph, determine the difference between the third well depth data and the preset well depth data, and correct the second well depth data based on the difference, the first well depth sequence and the second well depth sequence.

[0019] Based on the above solution, the present invention can also be improved as follows.

[0020] Furthermore, the first well depth data and the inner diameter data are measured by a multi-arm logging instrument.

[0021] Furthermore, the second well depth data and the wall thickness data are measured by an electromagnetic logging instrument.

[0022] Further, the process of correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence is:

[0023] The well depth sequence number corresponding to the positioning sub is determined in the second well depth sequence, and the well depth sequence number is used as a dividing point. The second well depth data is corrected forward or backward according to the correction data with every three peaks as a group, and the correction data is determined by the difference.

[0024] 3) In a third aspect, the present invention further provides a computer device, comprising a processor, wherein the processor is coupled to a memory, wherein at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by the processor so that the computer device implements a method for correcting well depth data as described in any of the above claims.

[0025] 4) In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein at least one computer program is stored in the computer-readable storage medium, and the at least one computer program is loaded and executed by a processor so that a computer implements a method for correcting well depth data as described in any of the above claims.

[0026] It should be noted that the beneficial effects achieved by the technical solutions of the second to fourth aspects of the present invention and the corresponding possible implementation methods can be found in the above-mentioned technical effects of the first aspect and its corresponding possible implementation methods, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 A schematic diagram of a flow chart of a method for correcting well depth data according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of a model architecture of a well depth data correction system according to an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the structure of a computer device for a method for correcting well depth data according to an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of a well depth-inner diameter line graph structure of a well depth data correction method according to an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of a well depth-wall thickness line graph structure of a well depth data correction method according to an embodiment of the present invention.

[0033] In the accompanying drawings, the meanings of the various reference numerals are listed as follows:

[0034] 1. Peak value of coupling wall thickness, 2. Peak value of coupling inner diameter, 3. Group of three consecutive peak values ​​of coupling wall thickness, 4. Group of three consecutive peak values ​​of coupling inner diameter, 5. Group of peak value of positioning pup joint wall thickness, 6. Group of peak value of positioning pup joint inner diameter. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, a method for correcting well depth data according to an embodiment of the present invention comprises the following steps:

[0037] S1, obtaining a well depth-inner diameter line graph constructed by first well depth data and inner diameter data of the pipe string to be tested, and obtaining a well depth-wall thickness line graph constructed by second well depth data and wall thickness data of the pipe string to be tested;

[0038] S2, extracting a first well depth sequence at the inner diameter peak of each pipe section from the well depth-inner diameter line graph, and extracting a second well depth sequence at the wall thickness peak of each pipe section from the well depth-wall thickness line graph;

[0039] S3, determining the third well depth data corresponding to the positioning pup joint in the well depth-wall thickness line graph, and determining the difference between the third well depth data and the preset well depth data, and correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence.

[0040] A correction method for well depth data in an embodiment of the present invention comprehensively adopts a double-peak value of a positioning short joint to adjust the well depth and a three-peak value group of a coupling to adjust the well depth, so that the well depth in the well depth-wall thickness big data obtained by electromagnetic logging is as close to the true value as possible, thereby improving the accuracy of the tubing position information and facilitating the correctness and reliability of tubing safety evaluation.

[0041] S1, the specific process of obtaining a well depth-inner diameter line graph constructed by the first well depth data and the inner diameter data of the pipe string to be tested, and obtaining a well depth-wall thickness line graph constructed by the second well depth data and the wall thickness data of the pipe string to be tested is as follows:

[0042] S11, acquiring two sets of data, namely, the well depth and the inner diameter, of any logging pipe string using the multi-arm caliper, and acquiring two sets of data, namely, the well depth and the wall thickness, of the pipe string using the electromagnetic logging instrument;

[0043] The multi-arm caliper is an instrument for measuring the inner diameter of a hole. As the inner diameter changes, the ends of the arms of the multi-arm caliper open or close, and at the same time drive the potentiometer sliding arm to move. The change in the inner diameter then becomes a change in resistance. When the potentiometer is powered through a cable, the potential difference between the changing resistors reflects the change in the inner diameter. The surface recording part records the change in potential difference, which is previously scaled by the caliper gauge, and this change is the size of the wellbore.

[0044] In this scheme, a 40-arm caliper was used for data acquisition.

[0045] Electromagnetic logging is a logging instrument that measures the technical status of the pipe string based on the principle of electromagnetic induction. During logging, the transmitting coil is supplied with a DC pulse current to generate an electromagnetic field, and the receiving coil generates an induced electromotive force that changes with time. When the thickness of the steel pipe changes or there are defects, the induced electromotive force will change. Through analysis and calculation, the defects of the pipe string can be determined and the wall thickness of the pipe string can be obtained.

[0046] S12, constructing a well depth-inner diameter line graph based on the two sets of data of well depth and inner diameter, and constructing a well depth-wall thickness line graph based on the two sets of data of well depth and wall thickness.

[0047] In the well depth-inner diameter line graph, the horizontal axis represents the inner diameter, and the vertical axis represents the well depth;

[0048] In the well depth-wall thickness line graph, the horizontal axis represents the wall thickness and the vertical axis represents the well depth.

[0049] Please note that the above is only an example. In actual operation, a line chart can be drawn according to the needs, or a histogram or pie chart can be used instead of a line chart.

[0050] The intervals between adjacent data in the well depth column are set to be the same and are all e1, where e1 is an integer multiple of 0.0125m and e1≤0.1m.

[0051] S2, the specific process of extracting the first well depth sequence at the inner diameter peak of each pipe section in the well depth-inner diameter line graph, and extracting the second well depth sequence at the wall thickness peak of each pipe section in the well depth-wall thickness line graph is as follows:

[0052] The well depth sequence Di (i value starts from 1) at the peak of the 2nd inner diameter of the coupling is extracted from the well depth-inner diameter line graph, and the well depth sequence Ti (i value starts from 1) at the peak of the 1st wall thickness of the coupling is extracted from the well depth-wall thickness line graph. For the same i value, |Di-Ti|≤e2.

[0053] During logging, inner diameter peaks and wall thickness peaks will appear at the tubing couplings. Since 40-arm logging and electromagnetic logging are performed twice, under normal circumstances, there will be a small difference between the well depth at the inner diameter peak and the well depth at the wall thickness peak at the same coupling. Due to reasons such as instruments, the inner diameter peak or the wall thickness peak may not appear at a certain coupling, resulting in the Di of the next coupling corresponding to the Ti of the current coupling, or the Di of the current coupling corresponding to the Ti of the next coupling, ultimately leading to distortion of the well depth sequence. At this time, the difference between Di and Ti is very large. Controlling this parameter avoids this incorrect situation.

[0054] The peak value 2 of the inner diameter of the coupling means that: both ends of each coupling are internal threads, which are connected to the external threads of the casing respectively, and the two ends of the casing connected by the coupling are not in contact, so when measuring the inner diameter, a large jump extreme value, that is, the peak value, will appear in the middle of each coupling.

[0055] The peak value 1 of the coupling wall thickness means that: both ends of each coupling are tapered pipe internal threads, and the wall thickness gradually increases from the two ends to the middle to the maximum value. In addition, the coupling wall thickness is much larger than the casing body wall thickness, so a peak will appear at the coupling during electromagnetic logging of the tubing string.

[0056] The peak value is extracted by sequential extraction using computer programming to extract the extreme points where the inner diameter or wall thickness is greater than a certain value.

[0057] S3, determining the third well depth data corresponding to the positioning pup joint in the well depth-wall thickness line graph, and determining the difference between the third well depth data and the preset well depth data, and correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence. The specific process is:

[0058] S31, determine the well depth data corresponding to the positioning pup joint in the well depth-wall thickness line graph, and compare it with the preset well depth data to obtain the difference. At this time, the well depth data of the positioning pup joint is reduced or increased by e3, and at the same time, all the well depth data in the well depth-wall thickness line graph are increased or decreased by e3.

[0059]

[0060] Wherein, Tk1 represents the well depth at the k1th coupling wall thickness peak 1, Tk2 represents the well depth at the k2th coupling wall thickness peak 1, Dk1 represents the well depth at the k1th coupling inner diameter peak 2, and Dk2 represents the well depth at the k2th coupling inner diameter peak 2.

[0061] The positioning nipple is adjusted as a whole, and the positioning nipple well depth data does not change after the adjustment. Although the positioning nipple is adjusted consistently, the well depth corresponding to the wall thickness peak value at other couplings is not consistent with the well depth corresponding to the inner diameter peak value, so it is necessary to further perform the three-in-one adjustment in S32 to fine-tune.

[0062] It needs to be further explained that there are generally two couplings (k1 coupling and k2 coupling) at the positioning short section, corresponding to two inner diameter peak well depths (Dk1 and Dk2) and two wall thickness peak well depths (Tk1 and Tk2) respectively.

[0063] S32, starting from the peak value of the wall thickness of the locating short joint, adjust the corresponding well depth of every three coupling wall thickness peak values ​​1 upward, that is, T(n-2), T(n-1), and Tn are all reduced by e4, and at the same time, the well depth data from T(n-2) to Tn are all reduced by e4.

[0064] Among them, T(n-2), T(n-1), and Tn are all reduced by e4, which means that these three data are reduced by e4 respectively, and at the same time, the well depth data from T(n-2) to Tn are all reduced by e4, which means that the data between T(n-2) and T(n-1) and the data between T(n-1) and Tn are all reduced by e4. That is, all data from well depth T(n-2) to well depth Tn are reduced by e4.

[0065] The calculation formula of e4 is as follows (e4 needs to be rounded to an integer multiple of e1). For three different peak values ​​of coupling wall thickness, the e4 value of group 1 is different.

[0066]

[0067] Among them, T(n-2) represents the well depth at which the (n-2)th coupling wall thickness peak is 1; T(n-1) represents the well depth at which the (n-1)th coupling wall thickness peak is 1; Tn represents the well depth at which the nth coupling wall thickness peak is 1; D(n-2) represents the well depth at which the (n-2)th coupling inner diameter peak is 2; D(n-1) represents the well depth at which the (n-1)th coupling inner diameter peak is 2; Dn represents the well depth at which the nth coupling inner diameter peak is 2.

[0068] S33, repeat S32, starting from the peak value of the wall thickness of the locating short joint, adjust the corresponding well depth for every three coupling wall thickness peak values ​​1 downward, and the area where the well depth is not adjusted in the well depth-wall thickness data is evenly adjusted according to the upper and lower boundary data at the well depth data interval e1.

[0069] like Figure 4 and Figure 5 As shown, there is a coupling wall thickness peak 1, a coupling inner diameter peak 2, a group 3 of three consecutive coupling wall thickness peaks, a group 4 of three consecutive coupling inner diameter peaks, a group 5 of positioning pup joint wall thickness peaks, and a group 6 of positioning pup joint inner diameter peaks.

[0070] T1 represents the well depth at which the first coupling wall thickness peak is located; T2 represents the well depth at which the second coupling wall thickness peak is located; T(n-3) represents the well depth at which the (n-3)th coupling wall thickness peak is located; Tk represents the well depth at which the k1th coupling wall thickness peak is located; Tk2 represents the well depth at which the k2th coupling wall thickness peak is located; T(n+1) represents the well depth at which the (n+1)th coupling wall thickness peak is located; and T(n+2) represents the well depth at which the (n+2)th coupling wall thickness peak is located.

[0071] D1 represents the well depth of 2 locations where the 1st coupling inner diameter peak value is located; D2 represents the well depth of 2 locations where the 2nd coupling inner diameter peak value is located; D(n-3) represents the well depth of 2 locations where the (n-3)th coupling inner diameter peak value is located; Dk1 represents the well depth of 2 locations where the k1th coupling inner diameter peak value is located; Dk2 represents the well depth of 2 locations where the k2th coupling inner diameter peak value is located; D(n+1) represents the well depth of 2 locations where the (n+1)th coupling inner diameter peak value is located; D(n+2) represents the well depth of 2 locations where the (n+2)th coupling inner diameter peak value is located.

[0072] e1 represents the interval of well depth data; e2 represents the maximum error of electromagnetic logging well depth; e3 represents the well depth adjustment value of the positioning pup joint; and e4 represents a group of well depth adjustment values ​​for the three coupling wall thickness peak values.

[0073] Furthermore, the first well depth data and the inner diameter data are measured by a 40-arm logging instrument.

[0074] Furthermore, the second well depth data and the wall thickness data are measured by an electromagnetic logging instrument.

[0075] Further, the process of correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence is:

[0076] The well depth sequence number corresponding to the positioning sub is determined in the second well depth sequence, and the well depth sequence number is used as a dividing point. The second well depth data is corrected forward or backward according to the correction data with every three peaks as a group, and the correction data is determined by the difference.

[0077] like Figure 2 As shown, the present invention also provides a correction system for well depth data, and the specific technical solution is as follows:

[0078] The acquisition module 100 is used to: acquire a well depth-inner diameter line graph constructed by first well depth data and inner diameter data of the pipe string to be tested, and acquire a well depth-wall thickness line graph constructed by second well depth data and wall thickness data of the pipe string to be tested;

[0079] The extraction module 200 is used to extract a first well depth sequence at the inner diameter peak of each pipe section from the well depth-inner diameter broken line graph, and to extract a second well depth sequence at the wall thickness peak of each pipe section from the well depth-wall thickness broken line graph;

[0080] The correction module 300 is used to determine the third well depth data corresponding to the positioning pup joint in the well depth-wall thickness line graph, determine the difference between the third well depth data and the preset well depth data, and correct the second well depth data based on the difference, the first well depth sequence and the second well depth sequence.

[0081] Furthermore, the first well depth data and the inner diameter data are measured by a 40-arm logging instrument.

[0082] Furthermore, the second well depth data and the wall thickness data are measured by an electromagnetic logging instrument.

[0083] Further, the process of correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence is:

[0084] The well depth sequence number corresponding to the positioning sub is determined in the second well depth sequence, and the well depth sequence number is used as a dividing point. The second well depth data is corrected forward or backward according to the correction data with every three peaks as a group, and the correction data is determined by the difference.

[0085] In the above embodiments, although the steps are numbered S1, S2, etc., these are only specific embodiments given by the present invention. Those skilled in the art may adjust the execution order of S1, S2, etc. according to actual conditions, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0086] It should be noted that the beneficial effects of the well depth data correction system provided in the above embodiment are the same as the beneficial effects of the well depth data correction method provided in the above embodiment, which will not be described in detail here. In addition, when the system provided in the above embodiment realizes its functions, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the system can be divided into different functional modules according to actual conditions to complete all or part of the functions described above. In addition, the system and method embodiments provided in the above embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be described in detail here.

[0087] like Figure 3 As shown, a computer device 400 according to an embodiment of the present invention includes a processor 420, the processor 420 is coupled to a memory 410, and the memory 410 stores at least one computer program 440, and the at least one computer program 440 is loaded and executed by the processor 420, so that the computer device 400 implements any one of the above-mentioned methods for correcting well depth data, specifically:

[0088] The computer device 400 may have relatively large differences due to different configurations or performances, and may include one or more processors 420 (Central Processing Units, CPU) and one or more memories 410, wherein at least one computer program 440 is stored in the one or more memories 410, and the at least one computer program 440 is loaded and executed by the one or more processors 420, so that the computer device 400 implements a correction method for well depth data provided by the above embodiment. Of course, the computer device 400 may also have components such as a wired or wireless network interface, a keyboard, and an input and output interface for input and output, and the computer device 400 may also include other components for realizing the functions of the device, which will not be described in detail here.

[0089] A computer-readable storage medium according to an embodiment of the present invention stores at least one computer program, which is loaded and executed by a processor so that a computer implements a method for correcting well depth data according to any one of the above claims.

[0090] Optionally, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.

[0091] In an exemplary embodiment, a computer program product or a computer program is also provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs any of the above-mentioned methods for correcting well depth data.

[0092] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects and represent the definition of a specific order or sequence. The order of use of similar objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than the order shown or described.

[0093] Those skilled in the art know that the present invention can be implemented as a system, method or computer program product. Therefore, the present disclosure can be specifically implemented in the following forms, namely: it can be complete hardware, it can be complete software (including firmware, resident software, microcode, etc.), or it can be a combination of hardware and software, which is generally referred to as "circuit", "module" or "system" herein. In addition, in some embodiments, the present invention can also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium contains computer-readable program code.

[0094] Any combination of one or more computer-readable media may be used. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device, or device.

[0095] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for correcting well depth data, characterized in that: include: S1, obtaining a well depth-inner diameter line graph constructed by first well depth data and inner diameter data of the pipe string to be tested, and obtaining a well depth-wall thickness line graph constructed by second well depth data and wall thickness data of the pipe string to be tested; S2, extracting a first well depth sequence at the inner diameter peak of each pipe section from the well depth-inner diameter line graph, and extracting a second well depth sequence at the wall thickness peak of each pipe section from the well depth-wall thickness line graph; S3, determining the third well depth data corresponding to the positioning pup joint in the well depth-wall thickness line graph, and determining the difference between the third well depth data and the preset well depth data, and correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence.

2. A method for correcting well depth data according to claim 1, characterized in that: The first well depth data and the inner diameter data are measured by a multi-arm logging instrument.

3. A method for correcting well depth data according to claim 1, characterized in that: The second well depth data and the wall thickness data are measured by an electromagnetic logging instrument.

4. A method for correcting well depth data according to claim 1, characterized in that: The process of correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence is: The well depth sequence number corresponding to the positioning sub is determined in the second well depth sequence, and the well depth sequence number is used as a dividing point. The second well depth data is corrected forward or backward according to the correction data with every three peaks as a group, and the correction data is determined by the difference.

5. A correction system for well depth data, characterized in that: include: The acquisition module is used to: acquire a well depth-inner diameter line graph constructed by first well depth data and inner diameter data of the pipe string to be tested, and acquire a well depth-wall thickness line graph constructed by second well depth data and wall thickness data of the pipe string to be tested; The extraction module is used to: extract a first well depth sequence at the inner diameter peak of each pipe section in the well depth-inner diameter broken line graph, and extract a second well depth sequence at the wall thickness peak of each pipe section in the well depth-wall thickness broken line graph; The correction module is used to: determine the third well depth data corresponding to the positioning pup joint in the well depth-wall thickness line graph, determine the difference between the third well depth data and the preset well depth data, and correct the second well depth data based on the difference, the first well depth sequence and the second well depth sequence.

6. A well depth data correction system according to claim 5, characterized in that: The first well depth data and the inner diameter data are measured by a multi-arm logging instrument.

7. A well depth data correction system according to claim 5, characterized in that: The second well depth data and the wall thickness data are measured by an electromagnetic logging instrument.

8. A well depth data correction system according to claim 5, characterized in that: The process of correcting the second well depth data based on the difference, the first well depth sequence and the second well depth sequence is: The well depth sequence number corresponding to the positioning sub is determined in the second well depth sequence, and the well depth sequence number is used as a dividing point. The second well depth data is corrected forward or backward according to the correction data with every three peaks as a group, and the correction data is determined by the difference.

9. A computer device, characterized in that: The computer device includes a processor, the processor is coupled to a memory, at least one computer program is stored in the memory, and the at least one computer program is loaded and executed by the processor so that the computer device implements a method for correcting well depth data as described in any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one computer program, and the at least one computer program is loaded and executed by a processor so that a computer implements a method for correcting well depth data as claimed in any one of claims 1 to 4.

Images