An oil and gas well pipe string safety analysis method and device based on logging big data

Abstract

The present application relates to the technical field of oil well pipe safety evaluation, and particularly relates to an oil and gas well pipe string safety analysis method and device based on logging big data. The method comprises: obtaining oil and gas well pipe string logging big data, wherein the pipe string logging big data comprises logging inner diameter big data, logging wall thickness big data and pipe body length of each pipe body in the oil and gas well pipe string; obtaining a pipe string strength curve based on the logging inner diameter big data, the logging wall thickness big data and the pipe body length of each pipe body in the oil and gas well pipe string; and analyzing the safety of the oil and gas well pipe string based on the pipe string strength curve. According to the logging inner diameter big data and the logging wall thickness big data, a series of inner diameter-wall thickness data pairs are constructed, each pair of inner diameter and wall thickness data used for calculating the pipe string strength is as close as possible to the same section of the pipe body, the accuracy of the pipe string strength calculation is improved, and the correctness and reliability of the pipe string safety evaluation are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil well pipe safety evaluation, and particularly relates to an oil and gas well pipe string safety analysis method and device based on logging big data. BACKGROUND

[0002] In the oil industry, oil pipes or casings are connected by coupling threads to form an oil and gas well pipe string or casing string extending from the wellhead to the well bottom. The coupling is relatively short compared to the oil pipe or casing, but has a relatively large wall thickness. To ensure the safe service of the oil and gas well pipe string, logging of the oil and gas well pipe string is required, and safety evaluation, i.e. strength calculation and analysis, is also required. During logging, measurements are taken at small equal intervals along the pipe body axis, and a large amount of measurement data is obtained for the pipe body between each two couplings. Strength calculation is mainly based on the pipe body diameter and wall thickness parameters, and the strength calculation formula requires that the diameter and wall thickness data used should belong to the same section of the pipe body. Currently, the commonly used logging method for oil and gas well pipe strings is to measure the pipe string inner diameter using a multi-arm caliper and to measure the pipe string wall thickness using electromagnetic flaw detection. After obtaining the inner diameter and wall thickness big data of the pipe string, strength calculation and safety checking of the pipe string are performed. Chinese patent CN 119807629 A discloses a well depth data correction method, system, device and medium. The method adjusts the well depth by comprehensively using the positioning nipple double-peak value and the coupling three-peak value group, 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. However, the method needs to correct the data multiple times, and the calculation process is complicated.

[0003] The existing pipe string safety evaluation method obtains the maximum inner diameter and the minimum wall thickness from the big data measured for each pipe to perform strength calculation, and the calculation result represents the pipe string strength of the well section where the pipe is located. Since the maximum inner diameter and the minimum wall thickness used for calculation are the worst size extreme values of the pipe, the two extreme values do not belong to the same section parameters of the pipe body, but belong to two different sections at a certain distance apart on the pipe string, which leads to a large deviation of the pipe string strength calculated based on the two extreme values. In addition, generally, multi-arm caliper logging and electromagnetic logging are performed twice. Due to the differences in stress and stretching amount of the cable for hoisting the logging instrument in the two scenarios of hoisting the multi-arm caliper and hoisting the electromagnetic logging instrument, the number of inner diameter measurement values and the number of wall thickness measurement values between the two couplings are not the same. The number of inner diameter measurement values may be greater than the number of wall thickness measurement values, or the number of inner diameter measurement values may be less than the number of wall thickness measurement values. As a result, the inner diameter measurement values and the wall thickness measurement values between the two couplings cannot be unified one-to-one to the same section of the pipe body, and if strength calculation is performed according to the inner diameter and wall thickness parameters of the same section, the pipe string safety evaluation result will be distorted. SUMMARY

[0004] To solve the above problems, the present application provides an oil and gas well pipe string safety analysis method and device based on logging big data.

[0005] The present application provides the following technical solutions:

[0006] An oil and gas well pipe string safety analysis method based on logging big data, the method comprising:

[0007] Obtaining oil and gas well pipe string logging big data, the pipe string logging big data comprising logging inner diameter big data, logging wall thickness big data and pipe length of each pipe body in the oil and gas well pipe string;

[0008] Obtaining pipe string strength curve based on logging inner diameter big data, logging wall thickness big data and pipe length of each pipe body in the oil and gas well pipe string;

[0009] Analyzing oil and gas well pipe string safety based on the pipe string strength curve.

[0010] Further, obtaining oil and gas well pipe string logging big data comprises:

[0011] Dividing the oil and gas well pipe string into multiple pipe bodies with collars as nodes from wellhead to well bottom;

[0012] Obtaining logging inner diameter big data of each pipe body and pipe length of each pipe body in the oil and gas well pipe string based on the first logging instrument measuring inner diameter of each pipe body from top to bottom;

[0013] Obtaining logging wall thickness big data of each pipe body in the oil and gas well pipe string based on the second logging instrument measuring wall thickness of each pipe body from top to bottom.

[0014] Further, the logging inner diameter big data and logging wall thickness big data of each pipe body are respectively mapped to the corresponding pipe body at equal intervals, and the logging inner diameter data interval and the logging wall thickness data interval are respectively represented as:

[0015] The logging inner diameter data interval is represented as:

[0016]

[0017] In the formula, L represents the average interval of pipe body logging inner diameter data of the jth pipe body, and L represents the pipe length of the jth pipe body. j L represents the average interval of pipe body logging inner diameter data of the jth pipe body, and L represents the pipe length of the jth pipe body.

[0018] The logging wall thickness data interval is represented as:

[0019]

[0020] In the formula, L represents the average interval of pipe body logging wall thickness data of the jth pipe body, and L represents the pipe length of the jth pipe body. jThe length of the j-th pipe body is represented by m, the number of well wall thickness data in the j-th pipe body is represented by m, and j represents the pipe body number.

[0021] Furthermore, based on big data of logging inner diameter and logging wall thickness of each pipe in the oil and gas well string, the string strength curve is obtained, including:

[0022] Based on the big data of well logging inner diameter and well logging wall thickness of each pipe, an inner diameter-wall thickness data pair is constructed along a predetermined direction for each pipe, wherein the cross section corresponding to the inner diameter in the inner diameter-wall thickness data pair is adjacent to or the same as the cross section corresponding to the wall thickness data.

[0023] Based on each pair of inner diameter-wall thickness data, calculate and obtain the tube strength of the section corresponding to the inner diameter or the section corresponding to the wall thickness data in that pair of inner diameter-wall thickness data.

[0024] Based on the tube strength of the cross section corresponding to the inner diameter or the cross section corresponding to the wall thickness data in all inner diameter-wall thickness data pairs, the strength curve of the tube is obtained.

[0025] Based on the strength curves of all tubes, the strength curve of the tube string is obtained.

[0026] Furthermore, the big data record of the well logging inner diameter of each pipe is D. j,1 D j,2 D j,3 ... D j,i D j,(n-1) and D j,n Where j represents the pipe body number, i represents the section number corresponding to the logging inner diameter of the upper coupling, i=1, 2, 3...n, and n represents the number of logging inner diameter data of this section of pipe body;

[0027] The logging wall thickness of each pipe is recorded as T. j,1 T j,2 T j,3 ... T j,x T j,(m-1) and T j,m Where j represents the pipe body number; x represents the section number corresponding to the logging wall thickness at the distance from the upper coupling, x=1, 2, 3...m, and m represents the number of logging wall thickness data for that section of pipe body.

[0028] Furthermore, based on the big data of the logging inner diameter and the logging wall thickness of each pipe, an inner diameter-wall thickness data pair is constructed for each pipe.

[0029] When i=1 and x=1, construct D j,1 -T j,1 Data pairs;

[0030] When 1 < i < n and 1 < x < m, construct Dj,i -T j,x 、D j,i -T j,(x+1) Two pairs of data pairs, wherein,

[0031]

[0032] wherein, represents the distance from the section of the pipe body well borehole inner diameter section i to the upper coupling; is a downward rounding mathematical operator; represents the average interval of the pipe body well borehole wall thickness data of the jth pipe body;

[0033] When i = n, x = m, construct D j,n -T j,m data pairs.

[0034] Further, when 1 < i < n, 1 < x < m, construct D j,i -T j,x , D j,i -T j,(x+1) Two pairs of data pairs, including:

[0035] Obtain two wall thickness data close to the target inner diameter section, denoted as T j,x , T j,(x+1) ;

[0036] Based on the target inner diameter section D j,i , two wall thickness section positions close to the target inner diameter section are constructed D j,i -T j,x , D j,i -T j,(x+1) Two pairs of data pairs.

[0037] Further, the distance value from the well target inner diameter section i to the upper coupling is represented as:

[0038] .

[0039] An oil and gas well pipe string safety analysis device based on well logging big data is also provided, and the device comprises:

[0040] A first acquisition unit is configured to acquire oil and gas well pipe string well logging big data, wherein the pipe string well logging big data comprises well logging inner diameter big data, well logging wall thickness big data and pipe body length of each pipe body in the oil and gas well pipe string;

[0041] A second acquisition unit is configured to obtain a pipe string strength curve based on the well logging inner diameter big data and the well logging wall thickness big data of each pipe body in the oil and gas well pipe string;

[0042] An analysis unit is configured to analyze the safety of the oil and gas well pipe string based on the pipe string strength curve.

[0043] Further, based on the logging inner diameter big data and the logging wall thickness big data of each pipe body in the oil and gas well pipe string, a pipe string strength curve is obtained, including:

[0044] Based on the logging inner diameter big data and the logging wall thickness big data of each pipe body, a series of inner diameter-wall thickness data pairs as close as possible to the same section along the longitudinal direction of the pipe body are constructed;

[0045] Based on each pair of inner diameter-wall thickness data pairs, the pipe body strength of the section is calculated, and the pipe body strength curve is obtained according to the pipe body strengths of different sections along the longitudinal direction;

[0046] Based on the strength curves of all pipe bodies, the pipe string strength curve is obtained.

[0047] The technical effects and advantages of the present application are as follows:

[0048] According to the logging inner diameter big data and the logging wall thickness big data, a series of inner diameter-wall thickness data pairs are constructed, each pair of inner diameter and wall thickness data used for calculating the pipe string strength is as close as possible to the same section of the pipe body, the accuracy of the pipe string strength calculation is improved, and the correctness and reliability of the pipe string safety evaluation are enhanced.

[0049] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood through practice of the present application. The objects and other advantages of the present application will be achieved and obtained by means of the structures indicated in the description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 is the oil and gas well pipe string safety analysis method flowchart provided by the embodiment of the present application based on logging big data;

[0051] Figure 2 is the schematic diagram of the relative position of the pipe string section where the logging inner diameter big data and the logging wall thickness big data are located.

[0052] In the figure: 1, upper coupling 1; 2, pipe body, 3, lower coupling. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0054] To solve the problems in the prior art, the present application discloses an oil and gas well pipe string safety analysis method based on logging big data, as shown inFigure 1 As shown in the method comprises:

[0055] Step 1: Obtain oil and gas well pipe string logging big data, the pipe string logging big data includes the logging inner diameter big data, the logging wall thickness big data and the pipe length of each pipe body in the oil and gas well pipe string;

[0056] Step 2: Based on the logging inner diameter big data and the logging wall thickness big data of each pipe body in the oil and gas well pipe string, respectively, the equal interval uniform mapping to the pipe length, a series of inner diameter-wall thickness data pairs as close as possible to the same section along the pipe longitudinal direction are constructed, the pipe body strength of each pair of inner diameter-wall thickness data pairs is calculated, the pipe body strength curve is obtained according to the pipe body strength of different sections along the longitudinal direction, and all pipe body strength curves are connected to obtain the pipe string strength curve;

[0057] Step 3: Based on the comparison analysis of the pipe string strength curve and the load curve of the pipe string service, the safety of the oil and gas well pipe string is analyzed.

[0058] In one embodiment of the present application, for step 1, obtaining oil and gas well pipe string logging big data, comprising:

[0059] From the wellhead to the bottom, the oil and gas well pipe string is divided into a plurality of pipe bodies by the nipple as the node; for example, the pipe bodies are connected in series by nipple thread connection to form an oil and gas well pipe string extending from the wellhead to the bottom, and for the nipples at both ends of the pipe body, the nipple close to the wellhead is the upper nipple, and the nipple close to the bottom is the lower nipple;

[0060] Based on the first logging instrument, the inner diameter of each pipe body is measured from top to bottom to obtain the logging inner diameter big data and the pipe length of each pipe body in the oil and gas well pipe string; for example, the inner diameter of the pipe string is measured by a multi-arm caliper to obtain the pipe length;

[0061] Based on the second logging instrument, the wall thickness of each pipe body is measured from top to bottom to obtain the logging wall thickness big data of each pipe body in the oil and gas well pipe string. For example, the wall thickness of the pipe string is measured by electromagnetic flaw detection.

[0062] In one embodiment of the present application, for step 2, based on the logging inner diameter big data and the logging wall thickness big data of each pipe body in the oil and gas well pipe string, the pipe string strength curve comprises:

[0063] Step 201, based on the logging inner diameter big data and the logging wall thickness big data of each pipe body, the inner diameter and wall thickness data sequence of each pipe body is constructed; for example, as shown in the jth pipe body structure diagram, Figure 2 The upper nipple 1 and the lower nipple 3 are arranged at the two end portions of the pipe body 2, n represents the number of pipe body logging inner diameter data; D j,1 represents the measured inner diameter of the 1st inner diameter section of the jth pipe body; Dj,2 D represents the measured inner diameter of the second inner diameter section of the j-th pipe body; j,3 D represents the measured inner diameter of the third inner diameter section of the j-th pipe body; j,i D represents the measured inner diameter of the i-th inner diameter section of the j-th pipe body; j,n This represents the measured inner diameter of the nth inner diameter section of the j-th pipe body. The large data record of the well logging inner diameter of this pipe body is denoted as D. j,1 D j,2 D j,3 ... D j,i D j,(n-1) and D j,n Where j represents the pipe body number, and i represents the section number corresponding to the logging inner diameter at the distance from the upper coupling, i = 1, 2, 3...n. The logging wall thickness data record for this pipe body is T. j,1 T j,2 T j,3 ... T j,x T j,(m-1) and T j,m Where j represents the pipe body number; x represents the section number corresponding to the logging wall thickness at the distance from the upper coupling, x = 1, 2, 3... m; where D j,1 and T j,1 These are the logging inner diameter data and logging wall thickness data closest to the upper coupling, respectively. j,n and T j,m These are the logging inner diameter data and logging wall thickness data closest to the lower coupling, respectively. n represents the number of logging inner diameter data for this section of the pipe, and m represents the number of logging wall thickness data for this section of the pipe.

[0064] Step 202: Based on the inner diameter-wall thickness data pairs for each pipe, obtain the corresponding strength curve for each pipe and construct inner diameter-wall thickness data pairs. In these pairs, the cross-section corresponding to the inner diameter is adjacent to or the same as the cross-section corresponding to the wall thickness data, ensuring that each pair of inner diameter and wall thickness data is as close as possible to the same cross-section of the pipe. For example, depending on the specific situation, one inner diameter data point may correspond to one or two wall thickness data points, or one wall thickness data point may correspond to one or two inner diameter data points.

[0065] The logging inner diameter data and logging wall thickness data of each pipe are uniformly mapped to the corresponding pipe length at equal intervals, either from top to bottom or bottom to top. The intervals for the logging inner diameter data and the logging wall thickness data are expressed as follows:

[0066] The spacing between well logging inner diameter data is expressed as follows:

[0067]

[0068] In the formula, represents the average interval of the well logging inner diameter data of the jth pipe body, L j represents the pipe length of the jth pipe body, n represents the number of well logging inner diameter data in the jth pipe body, and j represents the pipe number;

[0069] The well logging wall thickness data interval is represented as:

[0070]

[0071] In the formula, represents the average interval of the well logging wall thickness data of the jth pipe body, L j represents the pipe length of the jth pipe body, m represents the number of well logging wall thickness data in the jth pipe body, and j represents the pipe number.

[0072] Then, the inner diameter-wall thickness data pair for calculating the pipe string strength about the pipe body is constructed, and the specific operation is as follows:

[0073] (1) When i = 1 and x = 1, D j,1 -T j,1 data pair is constructed.

[0074] (2) When 1 < i < n and 1 < x < m, D j,i -T j,x , D j,i -T j,(x+1) two data pairs are constructed, wherein,

[0075] a. The distance from the well logging inner diameter section i to the upper coupling is represented as:

[0076] ;

[0077] b. Two wall thickness data close to the target inner diameter section are obtained, denoted as T j,x , T j,(x+1) ;

[0078] c. The well logging wall thickness section serial number of the wall thickness section position close to the upper coupling and close to the inner diameter section i is represented as:

[0079] ;

[0080] wherein, represents the distance from the well logging inner diameter section i of the pipe body to the upper coupling; is a downward rounding mathematical operator; represents the average interval of the well logging wall thickness data of the jth pipe body;

[0081] d. Based on the target inner diameter section D j,i ​Two wall thickness cross-section positions close to the target inner diameter cross-section form D j,i -T j,x Two wall thickness cross-section positions close to the target inner diameter cross-section form D j,i -T j,(x+1) Two pairs of data pairs.

[0082] i represents the cross-section number corresponding to the logging inner diameter distance from the upper coupling, i = 1, 2, 3 … n; x represents the cross-section number corresponding to the logging wall thickness distance from the upper coupling (the value range of x is 1~m); L j represents the length of the pipe body between the two couplings obtained during the inner diameter logging.

[0083] (3) When i = n, x = m, form D j,n -T j,m Data pairs.

[0084] According to the above step, form D j,1 -T j,1 , …, D j,i -T j,x , D j,i -T j,(x+1) , …, D j,n -T j,m A total of (2n-2) pairs of inner diameter-wall thickness data pairs.

[0085] Step 203, according to GB / T 20657-2022 (Petroleum and Natural Gas Industry Casing, Tubing, Drill Pipe and Line Pipe Used as Casing or Tubing Performance Formula and Calculation) standard, respectively calculating the pipe body strength for each pair of inner diameter-wall thickness data formed in step 202, and positioning the (2n-2) calculation results along the pipe body axis from top to bottom in equal intervals to form the strength curve of the jth pipe body.

[0086] Step 204, repeat steps 201 to 203, and complete the strength curves of all pipe bodies in the pipe string in top-to-bottom order.

[0087] Step 205, connect the strength curves of each pipe body of the pipe string to form the entire pipe string strength curve.

[0088] Step 206, compare the load curve and the strength curve of the pipe string to determine the service safety of the pipe string. The strength curve is actually a series of strength values of the pipe string from the wellhead to the bottom. The strength value at each depth position on the curve is compared with the external load at that position. If the pipe string strength value at that position is greater than the external load value, the pipe string at that position is relatively safe. Each depth position is compared in this way to obtain all safe positions and dangerous positions in the pipe string. The pipe body service load is obtained through wellhead testing and pipe string mechanics calculation, or directly tested.

[0089] The present application constructs a series of inner diameter-wall thickness data pairs according to the logging inner diameter big data and the logging wall thickness big data, realizes that each pair of inner diameter and wall thickness data used for calculating the string strength is as close to the same section of the pipe body as possible, improves the accuracy of the string strength calculation, and enhances the correctness and reliability of the string safety evaluation.

[0090] The present application also provides an oil and gas well string safety analysis device based on logging big data.

[0091] The first acquisition unit is configured to acquire the oil and gas well string logging big data, wherein the string logging big data comprises logging inner diameter big data, logging wall thickness big data and pipe body length of each pipe body in the oil and gas well string.

[0092] The second acquisition unit is configured to obtain the string strength curve based on the logging inner diameter big data and the logging wall thickness big data of each pipe body in the oil and gas well string.

[0093] The analysis unit is configured to analyze the safety of the oil and gas well string based on the comparison between the string strength curve and the load curve of the string service.

[0094] In one embodiment of the present application, the string strength curve is obtained based on the logging inner diameter big data and the logging wall thickness big data of each pipe body in the oil and gas well string, and the method comprises the following steps:

[0095] Based on the logging inner diameter big data and the logging wall thickness big data of each pipe body, a series of inner diameter-wall thickness data pairs as close to the same section as possible along the longitudinal direction of the pipe body are constructed.

[0096] The strength of the pipe body at each section is calculated based on each pair of inner diameter-wall thickness data pairs, and the strength curve of the pipe body is obtained according to the pipe body strength at different sections along the longitudinal direction.

[0097] The string strength curve is obtained based on the strength curves of all pipe bodies.

[0098] The technical solutions of the present application will be further described below in combination with the specific embodiments.

[0099] In order to reduce the calculation amount, the present example reduces the sample number of the logging inner diameter big data and the logging wall thickness big data, and the calculation process is only used to demonstrate the data processing method.

[0100] Step 1: Acquire the logging big data of the first pipe body. Acquire the logging inner diameter big data and the logging wall thickness big data of the first pipe body (the pipe body between the two couplings) from the wellhead.

[0101] According to the inner diameter logging data, the length L1 of the first pipe body between the two couplings is 10 m.

[0102] As shown in Tables 1 and 2, the number of cross-sections for measuring the inner diameter of the pipe between the two couplings is n=9, and the number of cross-sections for measuring the wall thickness of the pipe between the two couplings is m=11.

[0103] Table 1. Inner Diameter Measurement Data

[0104]

[0105] Table 2 Wall thickness test data

[0106]

[0107] Step 2: Construct inner diameter-wall thickness data pairs to ensure that each pair of inner diameter and wall thickness data is as close as possible to the same cross section of the pipe.

[0108] D, the well logging inner diameter data 1,1 D 1,2 D 1,3 D 1,4 D 1,5 D 1,6 D 1,7 D 1,8 D 1,9 The logging inner diameter data are uniformly mapped onto a pipe of length L1 at equal intervals. The spacing between the data is as follows:

[0109] (m)

[0110] T well logging wall thickness data 1,1 T 1,2 T 1,3 T 1,4 T 1,5 T 1,6 T 1,7 T 1,8 T 1,9 T 1,10 T 1,11 The logging wall thickness data is uniformly mapped onto a pipe of length L1 at equal intervals. The spacing between the data is as follows:

[0111] (m)

[0112] Then, a series of inner diameter-wall thickness data pairs are constructed to calculate the strength of the tubular column.

[0113] ① When i=1, construct D 1,1 -T 1,1 Data pair.

[0114] Table 3 shows the data pairs constructed when i=1.

[0115]

[0116] ②When 1 < i < 9,

[0117] a. The distance from the inner diameter section i to the upper collar:

[0118] ;

[0119] b. Solve the wall thickness section number which is close to the inner diameter section i and close to the upper collar. For the well logging wall thickness section sequence, the well logging wall thickness section number which is close to the upper collar is:

[0120] ;

[0121] wherein, is the floor mathematical operator, the corresponding relationship between i and x is shown in Table 4:

[0122] Table 4

[0123]

[0124] c. For each well logging inner diameter section, construct two pairs of inner diameter-wall thickness data pairs

[0125] Construct D j,i -T j,x , D j,i -T j,(x+1) Two pairs of data pairs, that is, find the two wall thickness measurement values which are closest to the inner diameter section i, realize that the inner diameter and wall thickness in the data pair are as close as possible to the same section of the pipe body, and at the same time ensure that the data is not lost. As shown in Table 5 and Table 6, from i = 2, gradually construct to i = 8, and the total number of constructed data pairs is 14.

[0126] Table 5 Data pairs constructed when i = 2~8 (name)

[0127]

[0128] Table 6 Data pairs constructed when i = 2~8 (value)

[0129]

[0130] ③ When i = 9, construct D 1,9 -T 1,11 data pair, see Table 7.

[0131] Table 7 Data pairs constructed when i = 9

[0132]

[0133] According to the above steps, the first pipe body forms D 1,1 -T 1,1 , D 1,2 -T 1,2 , D1,2 -T 1,3 、D 1,3 -T 1,3 、D 1,3 -T 1,4 、D 1,4 -T 1,4 、D 1,4 -T 1,5 、D 1,5 -T 1,6 、D 1,5 -T 1,7 、D 1,6 -T 1,7 、D 1,6 -T 1,8 、D 1,7 -T 1,8 、D 1,7 -T 1,9 、D 1,8 -T 1,9 、D 1,8 -T 1,10 、D 1,9 -T 1,11 A total of 16 pairs of inner diameter-wall thickness data are shown in Table 8:

[0134] Table 8 Total data pairs of construction

[0135]

[0136] Step 3: Assuming the pipe body steel grade is P110, the tensile strength, internal pressure strength and external extrusion strength of each pair of inner diameter-wall thickness data formed in step two are calculated according to GB / T 20657-2022 (Performance formula and calculation of casing, tubing, drill pipe and line pipe used as casing or tubing for petroleum and natural gas industry) standard, and the 16 calculation results are evenly positioned along the pipe body axis from top to bottom at equal intervals to form the strength curve of the first pipe body.

[0137] To reduce the amount of calculation, the calculation example only calculates the comparison results when i=7, as shown in Table 9, wherein the data pair used when the pipe body strength is calculated by the conventional method is D 1,7 -T 1,7 , that is, the well logging inner diameter section number is the same as the well logging wall thickness section number. It can be seen that the tensile strength, internal pressure strength and external extrusion strength of the pipe body calculated according to the method of the present application are all higher in accuracy than those calculated by the conventional method.

[0138] Table 9 Comparison of calculation results by the present method and the conventional method

[0139]

[0140] Step 4, repeat step 1 to step 3, and sequentially complete the strength curves of all pipe bodies in the pipe column from top to bottom.

[0141] Step 5, connect the strength curves of each pipe body of the pipe column to form the strength curve of the entire pipe column.

[0142] Step 6, compare the load curve and the strength curve of the pipe column in service to determine the service safety of the pipe column. In order to reduce the calculation amount, only the service safety of the pipe body of the well logging inner diameter section No. 7 section of the first pipe body is shown, and the results are shown in Table 10.

[0143] Table 10 pipe column safety analysis results (section No. 7 section of the well logging inner diameter section)

[0144]

[0145] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present application.

Claims

1. A method for safety analysis of oil and gas well tubing based on big data logging, characterized in that, The method includes: Obtain big data on logging of oil and gas well tubing, including big data on the logging inner diameter, logging wall thickness, and tubing length of each tubing in the oil and gas well tubing; Based on big data of logging inner diameter, logging wall thickness and pipe length of each pipe in the oil and gas well string, the string strength curve is obtained; Analysis of oil and gas well tubing safety based on the tubing strength curve; Among them, based on big data of well logging inner diameter and well logging wall thickness of each pipe in the oil and gas well string, the string strength curve is obtained, including: Based on the big data of well logging inner diameter and well logging wall thickness of each pipe, an inner diameter-wall thickness data pair is constructed along a predetermined direction for each pipe, wherein the cross section corresponding to the inner diameter in the inner diameter-wall thickness data pair is adjacent to or the same as the cross section corresponding to the wall thickness data. Based on each pair of inner diameter-wall thickness data, calculate and obtain the tube strength of the section corresponding to the inner diameter or the section corresponding to the wall thickness data in that pair of inner diameter-wall thickness data. Based on the tube strength of the cross section corresponding to the inner diameter or the cross section corresponding to the wall thickness data in all inner diameter-wall thickness data pairs, the strength curve of the tube is obtained. Based on the strength curves of all tubes, the strength curve of the tube string is obtained.

2. The method for oil and gas well tubing safety analysis based on well logging big data according to claim 1, characterized in that, Obtaining big data from oil and gas well logging strings, including: From the wellhead to the bottom of the well, the oil and gas well tubing string is divided into multiple pipes using couplings as nodes; Based on the first logging tool, the inner diameter of each pipe is measured from top to bottom to obtain big data on the logging inner diameter of each pipe in the oil and gas well string and the length of each pipe. The wall thickness of each pipe is measured from top to bottom using the second logging tool, obtaining big data on the logging wall thickness of each pipe in the oil and gas well string.

3. The method for oil and gas well tubing safety analysis based on well logging big data according to claim 2, characterized in that, The logging inner diameter data and logging wall thickness data of each pipe are uniformly mapped onto the corresponding pipe at equal intervals. The intervals for the logging inner diameter data and the logging wall thickness data are respectively expressed as: The spacing between well logging inner diameter data is expressed as follows: In the formula, L represents the average spacing of the logging inner diameter data for the j-th pipe body. j The length of the j-th pipe body is represented by n, the number of logging inner diameter data in the j-th pipe body is represented by j, and the pipe body number is represented by j. The spacing between well logging wall thickness data is expressed as follows: In the formula, L represents the average spacing of the logging wall thickness data for the j-th pipe body. j The length of the j-th pipe body is represented by m, the number of well wall thickness data in the j-th pipe body is represented by m, and j represents the pipe body number.

4. The method for oil and gas well tubing safety analysis based on well logging big data according to claim 1, characterized in that, The well logging inner diameter of each pipe is recorded as D. j,1 D j,2 D j,3 ... D j,i D j,(n-1) and D j,n Where j represents the pipe body number, i represents the section number corresponding to the logging inner diameter of the upper coupling, i=1, 2, 3...n, and n represents the number of logging inner diameter data for that pipe body; The logging wall thickness of each pipe is recorded as T. j,1 T j,2 T j,3 ... T j,x T j,(m-1) and T j,m Where j represents the pipe body number; x represents the section number corresponding to the logging wall thickness at the distance from the upper coupling, x=1, 2, 3...m, and m represents the number of logging wall thickness data for that pipe body.

5. The method for oil and gas well tubing safety analysis based on well logging big data according to claim 4, characterized in that, Based on the big data of well logging inner diameter and well logging wall thickness of each pipe, construct the inner diameter-wall thickness data pair for each pipe; When i=1 and x=1, construct D j,1 -T j,1 Data pairs; When 1 < i < n and 1 < x < m, construct D j,i -T j,x D j,i -T j,(x+1) Two pairs of data, among which, in, This indicates the distance from the inner diameter section i of the logging pipe to the upper coupling; The operator is used to select the integer from the left. This represents the average spacing of the logging wall thickness data for the j-th pipe body. When i=n and x=m, construct D j,n -T j,m Data pair.

6. The method for oil and gas well tubing safety analysis based on well logging big data according to claim 5, characterized in that, When 1 < i < n and 1 < x < m, construct D j,i -T j,x D j,i -T j,(x+1) Two pairs of data, including: Obtain the wall thickness data of two adjacent sections to the target inner diameter section, denoted as T. j,x T j,(x+1) ; Based on the target inner diameter section D j,i And the two wall thickness data adjacent to the target inner diameter section, construct D j,i -T j,x D j,i -T j,(x+1) Two pairs of data.

7. The method for oil and gas well tubing safety analysis based on well logging big data according to claim 6, characterized in that, The distance from the inner diameter section i of the logging target to the upper coupling is expressed as: 。 8. A safety analysis device for oil and gas well tubing based on well logging big data, characterized in that, The device includes: The first acquisition unit is used to acquire big data of logging of oil and gas well tubing, including big data of logging inner diameter, logging wall thickness and tubing length of each tube in the oil and gas well tubing; The second acquisition unit is used to obtain the string strength curve based on the big data of the logging inner diameter and logging wall thickness of each pipe in the oil and gas well string; wherein, obtaining the string strength curve based on the big data of the logging inner diameter and logging wall thickness of each pipe in the oil and gas well string includes: Based on the big data of well logging inner diameter and well logging wall thickness of each pipe, an inner diameter-wall thickness data pair is constructed along a predetermined direction for each pipe, wherein the cross section corresponding to the inner diameter in the inner diameter-wall thickness data pair is adjacent to or the same as the cross section corresponding to the wall thickness data. Based on each pair of inner diameter-wall thickness data, calculate and obtain the tube strength of the section corresponding to the inner diameter or the section corresponding to the wall thickness data in that pair of inner diameter-wall thickness data. Based on the tube strength of the cross section corresponding to the inner diameter or the cross section corresponding to the wall thickness data in all inner diameter-wall thickness data pairs, the strength curve of the tube is obtained. Based on the strength curves of all tubes, the strength curve of the tubular column is obtained; The analysis unit is used to analyze the safety of oil and gas well tubing based on the tubing strength curve.

9. The oil and gas well tubing safety analysis device based on well logging big data according to claim 8, characterized in that, The well logging inner diameter of each pipe is recorded as D. j,1 D j,2 D j,3 ... D j,i D j,(n-1) and D j,n Where j represents the pipe body number, i represents the section number corresponding to the logging inner diameter of the upper coupling, i=1, 2, 3...n, and n represents the number of logging inner diameter data for that pipe body; The logging wall thickness of each pipe is recorded as T. j,1 T j,2 T j,3 ... T j,x T j,(m-1) and T j,m Where j represents the pipe body number; x represents the section number corresponding to the logging wall thickness at the distance from the upper coupling, x=1, 2, 3...m, and m represents the number of logging wall thickness data for that pipe body.

10. The oil and gas well tubing safety analysis device based on well logging big data according to claim 9, characterized in that, Based on the big data of well logging inner diameter and well logging wall thickness of each pipe, construct the inner diameter-wall thickness data pair for each pipe; When i=1 and x=1, construct D j,1 -T j,1 Data pairs; When 1 < i < n and 1 < x < m, construct D j,i -T j,x D j,i -T j,(x+1) Two pairs of data, among which, in, This indicates the distance from the inner diameter section i of the logging pipe to the upper coupling; The operator is used to select the integer from the left. This represents the average spacing of the logging wall thickness data for the j-th pipe body. When i=n and x=m, construct D j,n -T j,m Data pairs; When 1 < i < n and 1 < x < m, construct D j,i -T j,x D j,i -T j,(x+1) Two pairs of data, including: Obtain the wall thickness data of two adjacent sections to the target inner diameter section, denoted as T. j,x T j,(x+1) ; Based on the target inner diameter section D j,i And the two wall thickness data adjacent to the target inner diameter section, construct D j,i -T j,x D j,i -T j,(x+1) Two pairs of data.

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