A three-dimensional modeling method for pipe strings with multi-arm wellbore diameters along the circumferential curve of the wellbore trajectory

Abstract

The present invention relates to the field of drilling technology, and in particular to a method for three-dimensional modeling of a pipe string with multi-arm wellbore diameters along the circumferential curve of a wellbore trajectory, including arm wellbore azimuth correction; multi-arm wellbore centering correction; wellbore trajectory calculation; three-dimensional modeling of the full-well section curve method along the wellbore trajectory; and three-dimensional pipe string graphic rendering. The present invention uses a multi-depth point superposition fitting circle method to perform centering correction, effectively solving the abnormal interface problem in single-depth point data processing, and improving the accuracy of obtaining the true radius value of the pipe string at different depth points and azimuths. At the same time, the three-dimensional modeling technology of the full-well section curve method along the wellbore trajectory is adopted, combined with the three-dimensional graphic rendering technology of the circumferential curve encryption method, which significantly reduces the programming complexity and calculation cost, and improves the efficiency of full-well section modeling and software operation performance.

Description

Technical Field

[0001] The invention relates to the field of drilling technology, in particular to a three-dimensional modeling method for a pipe string with multi-arm well diameters encrypted along a circumferential curve of a wellbore trajectory. Background Art

[0002] Multi-arm caliper instruments are important equipment for casing damage detection in oil and gas wells. They can provide important technical support for casing damage detection and evaluation by measuring the inner diameter data of the pipe string at different depths and orientations in the wellbore with high precision. These devices are widely used in various wellbore conditions, especially in the detection and evaluation of casing deformation and damage. The multi-arm caliper instruments currently on the market include 24-arm, 40-arm and 60-arm types, which can meet the measurement needs under different well conditions. However, as oil and gas wells evolve from vertical wells to complex wells and multi-branch wells, existing technologies have exposed many deficiencies in data processing, modeling and comprehensive application.

[0003] First, the existing processing methods for multi-arm wellbore data are mostly limited to the correction and analysis of single depth points. However, due to the possible errors or offsets in the measured data, the processing method of single depth points often leads to abnormal interface problems, affecting the accuracy and stability of casing damage detection. For complex wellbores in the entire well section, the existing correction technology is difficult to effectively solve the data offset problem, which limits the authenticity of the measured data and the reliability of subsequent modeling.

[0004] Secondly, the current 3D modeling technology mainly uses the slicing method to visualize the data and generates 3D graphics through triangulation rendering. This method is suitable for the display of local pipe string damage, but in the full-well section and deep-depth scenarios, there are problems of low modeling efficiency and high computational complexity. It has too high requirements on hardware and software performance and is difficult to meet the needs of efficient modeling. At the same time, traditional modeling technology is usually based on the vertical well assumption, simplifying the wellbore trajectory into a straight line, ignoring the complex non-linear characteristics of the actual wellbore, especially under multi-branch wells and non-straight well conditions. It cannot accurately reflect the true shape of the wellbore. This simplification seriously affects the model's true display of the downhole pipe string condition.

[0005] In addition, the existing methods have deficiencies in combining the wellbore trajectory with the surrounding formation information, making it difficult to accurately locate the specific location of casing deformation and damage, and unable to reveal its formation mechanism. This defect not only limits the application of technology under complex geological conditions, but also weakens its technical support capabilities in downhole operations such as wellbore trajectory optimization design and formulation of perforation and fracturing plans, which may increase the risk of pipe string damage during construction and maintenance, thereby affecting the production efficiency and operational safety of oil and gas wells. Summary of the invention

[0006] In view of the above problems, the present invention proposes a three-dimensional modeling method for a pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory. The method performs centering correction by superimposing a fitting circle method at multiple depth points, effectively solving the abnormal interface problem in the data processing of a single depth point, and improving the accuracy of obtaining the true radius value of the pipe string at different depth points and orientations in the well. At the same time, the three-dimensional modeling technology of the full-well section curve method along the wellbore trajectory is adopted, combined with the three-dimensional graphics rendering technology of the circumferential curve encryption method, which significantly reduces the programming complexity and calculation cost, and improves the efficiency of full-well section modeling and software operation performance. The technical solution also fully considers the non-linear characteristics of the actual wellbore, truly reflects the shape of the wellbore trajectory under complex well conditions, and provides higher accuracy and reliability for casing damage detection and evaluation. In addition, by integrating the wellbore trajectory and formation information, the casing damage position and its formation mechanism can be accurately located, providing comprehensive technical parameter support for the optimization of wellbore trajectory design and the formulation of perforation and fracturing schemes, reducing the risk of damage to the pipe string during the operation, and significantly improving the efficiency and safety of oil and gas well construction and maintenance.

[0007] The present invention is achieved through the following technical solutions:

[0008] The method for three-dimensional modeling of a pipe string with multi-arm well diameters encrypted along the circumferential curve of a wellbore trajectory comprises the following steps:

[0009] S1, multi-arm caliper azimuth correction, the input pipe string inner diameter array data is arranged at each depth point in a group of data according to the high end of the caliper, and the group of data is the data set of all measuring arms of the caliper at the current depth point;

[0010] S2, multi-arm wellbore centering correction, superimpose the circumferential pipe string radius values ​​of multiple depth points, and calculate the center point of the caliper in the actual logging process through the circle fitting method;

[0011] S3, wellbore trajectory calculation, the wellbore trajectory is calculated by the broken line method;

[0012] S4, three-dimensional modeling of the entire well section curve method along the well trajectory, generating a three-dimensional pipe string graph centered on the well trajectory using the correction data calculated in steps S1-S2;

[0013] S5. 3D pipe string graphics rendering, using the circumferential encrypted curve method to linearly insert multiple similar curves on the circumference of the pipe string graphics for rendering, to obtain a 3D pipe string rendering graphics.

[0014] Furthermore, the S1 comprises the following sub-steps:

[0015] S101, record the data of the change in the azimuth of the No. 1 measuring arm relative to the high end of the caliper;

[0016] S102, calculating the offset of the No. 1 measuring arm relative to the caliper based on the data of the No. 1 measuring arm; the calculation formula of the offset of the No. 1 measuring arm relative to the caliper is as follows:

[0017]

[0018] in, represents the azimuth curve value of the No. 1 measuring arm sampled at the lth depth, represents the constant 360, Indicates the number of circumferential curves required for calculating three-dimensional graphics rendering. Indicates the total number of measuring arms of the caliper. Indicates the number of curves after circumferential encryption;

[0019] S103, calculating the relative positions of the remaining measuring arms on the pipe wall along the X-axis direction based on the offset of the No. 1 measuring arm relative to the caliper.

[0020] Furthermore, the S2 comprises the following sub-steps:

[0021] S201, representing a cross section of a depth point in the pipe string in the form of a fitted circle, wherein the radius of the fitted circle represents the average value of the radius of the pipe string at the depth point, the center of the fitted circle represents the center point of the caliper, and the direction of the center of the fitted circle in the coordinate represents the direction of eccentricity of the caliper;

[0022] S202, obtaining the actual coordinates of the center point of the caliper in the pipe string, and then calculating the distance from the center point of the caliper to all the detection points of the measuring arms as the radius values ​​of all directions of the pipe string at the depth point, and the calculation formula is as follows:

[0023] in, It represents the corrected engineering value of the i-th sampling point around the well. represents the actual coordinates of the i-th sampling point around the well, Indicates the actual coordinates of the center point. Represents the coordinate scale factor;

[0024] S203, for each depth point in the measuring well section, the inner diameter array data of the pipe string is fitted by the least square method to obtain the wellbore trajectory, the actual coordinate position of the center point of the caliper in the pipe string is found, and the array caliper curve of the entire well section is centered.

[0025] Furthermore, S3 includes the following sub-steps:

[0026] S301, collecting well inclination angle and well inclination azimuth data at different depths in the well through an inclinometer;

[0027] S302, directly connecting all the depth points in the well in sequence by using the broken line method, performing geometric operations using the well inclination angle and well inclination azimuth data, and calculating the three-dimensional spatial coordinates of different depth points in the well;

[0028] S303, converting the three-dimensional space coordinates into a wellbore trajectory.

[0029] Furthermore, the S4 comprises the following sub-steps:

[0030] S401, scale-shifting the multi-arm caliper array curve, and drawing a plane diagram according to the linear scale required for logging, where different curves in the plane diagram represent the inner diameter values ​​at different positions of the pipe string;

[0031] S402, the spatial coordinates of different depth points of each curve of the three-dimensional modeling, the spatial coordinate calculation formula is as follows:

[0032]

[0033]

[0034]

[0035] in, , , represents the coordinates of the wellbore trajectory at the i-th depth point, , , represents the three-dimensional space coordinates of the i-th depth point in the j-th curve, represents the drawing radius, Indicates the standard inner diameter of the pipe string. It represents the multi-arm caliper measurement value of the i-th depth point in the j-th curve after centering correction. represents the constant 3.1415926, Indicates the total number of curves after circumferential encryption, represents the well inclination angle of the i-th depth point;

[0036] S403, sequentially connecting the spatial coordinates of different depth points of each curve of the three-dimensional modeling in order from top to bottom to form a three-dimensional pipe string graph.

[0037] Furthermore, the total number of curves of the three-dimensional pipe string rendering graphics in S5 is The calculation formula is as follows:

[0038]

[0039] in, represents the constant 3.1415926, represents the drawing radius, Indicates the drawing width of a single curve in a graph;

[0040] Linear interpolation is used to insert similar curves between two adjacent curves. The calculation formula is as follows:

[0041]

[0042] in, Indicates the xth curve value inserted between two adjacent curves. Indicates the first curve value of two adjacent curves. Indicates the second curve value of two adjacent curves. Indicates the number of curves that need to be inserted between two adjacent curves.

[0043] Beneficial effects of the present invention:

[0044] (1) The proposed method for 3D modeling of multi-arm wellbore diameters along the circumferential curve of the wellbore trajectory uses the multi-depth point superposition fitting circle method to perform centering correction, effectively solving the abnormal interface problem that often occurs in single-depth point processing and significantly improving the correction accuracy. The corrected multi-arm wellbore array curve is significantly better than the original curve and the single-depth point correction curve in terms of change amplitude and symmetry, and the measurement error is reduced to an acceptable range, providing a more reliable basis for subsequent data processing and analysis;

[0045] (2) The method for 3D modeling of pipe strings with multi-arm wellbore diameters and circumferential curve encryption along the wellbore trajectory proposed in the present invention adopts the full-segment curve method along the wellbore trajectory to perform 3D pipe string modeling, and realizes efficient rendering through circumferential curve encryption technology, which solves the problems of complex traditional programming and low software operation efficiency. Its 3D rendering can not only reflect the real trajectory of the wellbore, but also clearly display the damage position of the pipe string and the formation information, which significantly improves the practicality and accuracy of the model;

[0046] (3) The three-dimensional modeling method of the pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory proposed in the present invention can intuitively display the formation layer and orientation information of casing change and casing damage through the three-dimensional pipe string graphics, providing technical support for the evaluation of local damage of the pipe string. At the same time, through the combination with geological information, this method can assist in analyzing the impact of large-scale sand fracturing and other operations on formation stress, providing a scientific basis for improving the wellbore trajectory design and formulating a reasonable perforation and fracturing plan;

[0047] (4) The proposed method for three-dimensional modeling of multi-arm wellbore calipers along the circumferential curve of the wellbore trajectory is suitable for modeling and analysis of multi-branch wells and complex wellbore structures. Through deep mining and optimization processing of multi-arm caliper logging data, it can effectively support the establishment of shear mechanics model and geological model of casing change and loss in the process of shale gas development, and has strong application value.

[0048] (5) The three-dimensional modeling method of the pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory proposed in the present invention uses coordinate surface mapping technology. The three-dimensional visualization effect diagram can accurately analyze the relationship between the damage position of the pipe string and the formation stress distribution. Further combined with the oil test data, key parameters such as the ground stress difference, cohesion and internal friction angle can be effectively calculated, providing technical support for predicting the critical injection pressure of formation sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 A flow chart of a method for three-dimensional modeling of a pipe string with multi-arm well diameters encrypted along a circumferential curve of a wellbore trajectory proposed by the present invention;

[0051] Figure 2 A schematic diagram of the centering correction of the multi-arm well diameter according to the pipe string three-dimensional modeling method for multi-arm well diameter densification along the circumferential curve of the wellbore trajectory proposed by the present invention;

[0052] Figure 3 A schematic diagram of the calculation of the wellbore trajectory using the broken line method of the pipe string three-dimensional modeling method for multi-arm well diameters along the circumferential curve of the wellbore trajectory proposed by the present invention;

[0053] Figure 4 A multi-arm wellbore array curve plane diagram of a pipe string three-dimensional modeling method for multi-arm wellbore along the circumferential curve of the wellbore trajectory proposed by the present invention;

[0054] Figure 5 A schematic diagram of 3D modeling using the full-well section curve method of the pipe string 3D modeling method for multi-arm well diameters along the circumferential curve of the wellbore trajectory proposed by the present invention;

[0055] Figure 6 A schematic diagram of a three-dimensional graphic rendering of a circumferentially encrypted curve method of a pipe string three-dimensional modeling method for circumferentially encrypted multi-arm wellbore along a wellbore trajectory proposed by the present invention;

[0056] Figure 7 A comparison diagram of the centering correction effect of the multi-arm wellbore array curve of the pipe string three-dimensional modeling method for multi-arm wellbore along the circumferential curve of the wellbore trajectory proposed by the present invention;

[0057] Figure 8 This is a visualization modeling effect diagram of a three-dimensional pipe string of a multi-arm well diameter along the wellbore trajectory full-well section curve method according to the pipe string three-dimensional modeling method of a multi-arm well diameter along the wellbore trajectory proposed by the present invention;

[0058] Fig. 9 A schematic diagram of a terminal device for a three-dimensional pipe string modeling method for multi-arm well diameters along a circumferential curve of a wellbore trajectory proposed by the present invention;

[0059] Fig.10 A schematic diagram of a readable storage medium for a three-dimensional modeling method of a pipe string with multi-arm well diameters encrypted along a circumferential curve of a wellbore trajectory proposed by the present invention;

[0060] In the figure, 200-terminal device, 210-memory, 211-RAM, 212-cache memory, 213-ROM, 214-program / utility, 215-program module, 220-processor, 230-bus, 240-external device, 250-I / O interface, 260-network adapter, 300-program product. DETAILED DESCRIPTION

[0061] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0062] Example 1

[0063] refer to Figure 1 The method for three-dimensional modeling of pipe strings with multi-arm well diameters along the circumferential curve of the wellbore trajectory includes the following steps:

[0064] 1. Arm caliper azimuth correction. During the logging process, the caliper will rotate in the wellbore. This embodiment records the change in the direction of arm 1 relative to the high end of the caliper during the logging process. The high end azimuth correction is to rearrange the input pipe string inner diameter array data, a set of data at each depth point, such as 24 data for a 24-arm caliper and 60 data for a 60-arm caliper, according to the high end of the instrument.

[0065] The high-end azimuth correction process actually determines the azimuth of each measuring arm relative to the high end of the instrument. After calculating the offset of the first measuring arm relative to the high end of the instrument through the azimuth recorded by arm 1, the relative positions of all measuring arms in the X-axis direction of the pipe wall are calculated. The calculation formula for the offset of arm 1 relative to the high end of the instrument is as follows:

[0066]

[0067] in, Indicates the offset of arm 1 relative to the high end of the instrument. represents the azimuth curve value of the No. 1 measuring arm sampled at the lth depth, represents the constant 360, Indicates the number of circumferential curves required for calculating three-dimensional graphics rendering. Indicates the total number of measuring arms of the caliper. Indicates the number of curves after circumferential encryption.

[0068] 2. Centering correction of multi-arm wellbore. When the well deviation is large, the center of the caliper and the center of the pipe string are not in the same position during the logging process. This embodiment performs centering correction to eliminate the phenomenon that the inner diameter of the pipe string array recorded by the multi-arm wellbore is symmetrically larger or smaller due to the non-centering of the downhole instrument.

[0069] The key to the centering correction of the caliper is to find the actual coordinate position of the center point of the caliper in the pipe string. In this embodiment, a circle fitting method is used to superimpose multiple pipe string radius values ​​at multiple depth points to find the center point of the instrument in the actual logging process. Figure 2 As shown, the left side of the figure is the measured data before centering correction, that is, the cross-sectional diagram of a depth point in the pipe string, and the right side is the cross-sectional diagram of the depth point after centering correction. It can be seen from the cross-sectional diagram on the left that the instrument is seriously eccentric. The radius of the fitting circle in the figure reflects the average value of the radius of the pipe string at the depth point, the center of the circle is the center point of the instrument, and the direction of the center of the circle in the coordinate is the eccentricity of the instrument.

[0070] After obtaining the actual coordinate position of the center point of the caliper in the well, the caliper centering correction can recalculate the sampling point according to the distance between the actual center point position and the sampling point position around the well. The calculation formula is as follows:

[0071] in, It represents the corrected engineering value of the i-th sampling point around the well. represents the actual coordinates of the i-th sampling point around the well, Indicates the actual coordinates of the center point. Represents the coordinate scale factor;

[0072] For each depth point in the measured well section, the inner diameter array data of the pipe string is fitted by the least squares method to obtain the well trajectory, the actual coordinate position of the caliper center point in the pipe string is found, and the array caliper curve of the entire well section is centered.

[0073] 3. Borehole trajectory calculation: In this embodiment, the inclination angle and inclination azimuth data of different depth points in the well are collected by the inclinometer, all the depth points in the well are directly connected in sequence by the broken line method, and the inclination angle and inclination azimuth data are used for geometric calculation to calculate the three-dimensional spatial coordinates of different depth points in the well, so as to obtain the borehole trajectory parameters, such as Figure 3As shown, this embodiment provides the acquired well inclination data points: O' is the starting point (ground), A, B, C... are data acquisition points, li is the depth interval at the i-th measurement, δi is the well inclination angle at the i-th measurement, and Ψi is the well inclination azimuth at the i-th measurement.

[0074] In the process of diagramming, in order to make the spatial position relationship of key data points more intuitive and avoid the occlusion of some data points by the coordinate axis, appropriate perspective adjustment and rotation were performed. Figure 3 The 3D perspective method is used, and users can rotate the image to view different angles by dragging the mouse. This rotation does not affect the actual definition of the coordinate axis, but is to optimize the image display effect so that the main data points are in the first quadrant and are clearly visible. If the default perspective is used, some data points may be blocked by the coordinate axis, affecting reading. Therefore, Figure 3 The viewing angle adjustment is for display clarity considerations and does not affect the definition of the coordinate axis direction.

[0075] The spatial position of the collected data such as O', A, B, C, etc. is described by the three parameters of well depth, well inclination angle, and well inclination azimuth. The coordinate value of each point in the rectangular coordinate system can be calculated through geometric operations:

[0076] O'(0,0,h1)

[0077] A((h2-h1)sinδ1sinΨ1,(h2-h1) sinδ1cosΨ1,h1+(h2-h1)cosδ1);

[0078] B(Ax+(h3-h2)sinδ2sinΨ2,Ay+(h3-h2) sinδ2cosΨ2,Az+(h3-h2)cosδ2);

[0079] C(Bx+(h4-h3)sinδ3sinΨ3,By+(h4-h3) sinδ3cosΨ3,Bz+(h4-h3)cosδ3);

[0080] …

[0081] Where: Ax and Bx are the X coordinates of points A and B, y and By are the Y coordinates of points A and B, and z and Bz are the Z coordinates of points A and B.

[0082] h2=h1+l1

[0083] h3=h2+l2

[0084] h4=h3+l3

[0085] …

[0086] hn=hn-1+ln.

[0087] 4. Three-dimensional modeling of the full-segment curve method along the wellbore trajectory. In this embodiment, the multi-arm wellbore array data processed in steps 1 and 2 is used to generate a three-dimensional pipe string graphic centered on the wellbore trajectory, such as Figure 4 The figure shown is a plane diagram of the multi-arm wellbore array curve after the scale is offset by 2mm from left to right and drawn according to the linear scale of 40-100mm. The first curve from the left reflects the inner diameter value at the high end of the pipe string, and the other curves reflect the inner diameter values ​​of the pipe string at different positions in the clockwise direction. The spatial coordinate calculation formula of different depth points of each curve of the three-dimensional modeling is as follows:

[0088]

[0089]

[0090] in, , , represents the coordinates of the wellbore trajectory at the i-th depth point, , , represents the three-dimensional space coordinates of the i-th depth point in the j-th curve, represents the drawing radius, Indicates the standard inner diameter of the pipe string. It represents the multi-arm caliper measurement value of the i-th depth point in the j-th curve after centering correction. represents the constant 3.1415926, Indicates the total number of curves after circumferential encryption, Represents the well inclination angle of the i-th depth point.

[0091] Connect each curve in order of depth from top to bottom to form the following Figure 5 In the figure shown, the red line in the modeled figure is the high end position of the pipe string, the width of the gray circle reflects the wall thickness of the pipe string, and the curve color is linearly matched with the radius increment according to the professional color code. The red line indicates that the inner diameter is enlarged, the blue line indicates that the inner diameter is reduced, and the green line indicates that the inner diameter has not changed.

[0092] 5. 3D pipe string graphic rendering. This embodiment uses the circumferential encrypted curve method to linearly insert a number of adjacent similar curves on the 360-degree circumference of the graphic to achieve the purpose of 3D graphic rendering. The calculation formula for the total number of ideal 3D graphic rendering curves is as follows:

[0093]

[0094] in, represents the constant 3.1415926, represents the drawing radius, Indicates the drawing width of a single curve in a graph;

[0095] Linear interpolation is used to insert similar curves between two adjacent curves. The calculation formula is as follows:

[0096]

[0097] in, Indicates the xth curve value inserted between two adjacent curves. Indicates the first curve value of two adjacent curves. Indicates the second curve value of two adjacent curves. Indicates the number of curves that need to be inserted between two adjacent curves.

[0098] like Figure 6 As shown, Figure 5 The effect of the figure after three-dimensional graphics rendering using the circumferential densification curve method along the wellbore trajectory. In the figure, red indicates an increase in the inner diameter, blue indicates a decrease in the inner diameter, and green indicates that the inner diameter remains unchanged. Figure 6 The change of the inner diameter of the pipe string is clear and natural, achieving a more ideal three-dimensional graphics rendering effect.

[0099] This embodiment provides a simple and easy technical solution for displaying the actual situation of the downhole pipe string. This technology can be used for vertical wells, highly deviated wells, horizontal wells and other types. It can be used for casing change and casing damage detection in single wells or platform multi-branch wells. It can also be used for casing change and casing damage mechanism analysis, and provide technical support for adjusting wellbore trajectory, improving family perforation, and designing large-scale sand fracturing solutions.

[0100] The centering correction of multi-depth point superposition fitting circle method solves the abnormal interface problems often seen in single depth point processing, such as Figure 7 As shown, the original curve collected on-site by the multi-arm caliper, the single-depth point centering correction curve, and the multi-depth point centering correction curve are compared.

[0101] Figure 7 The third track from the left is the original curve collected by the multi-arm caliper on site, the fourth track is the curve after single-depth point centering correction, and the fifth track is the curve after multiple-depth point centering correction. In the 3161-3163.4m well section, the original curve reflects that the inner diameter value of the pipe string changes dramatically, and the two types of centering multi-arm caliper array curves change less, indicating that the eccentricity of the instrument causes the inner diameter value to increase or decrease symmetrically in the well, and its measurement error exceeds 30%. From the red arrow mark in the figure, it can be seen that the single-depth point centering correction produces an obvious mutation interface, and the multiple-depth point centering correction achieves a good correction effect. The corrected array curve value is consistent with the actual pipe string inner diameter.

[0102] The three-dimensional pipe string visualization modeling along the entire wellbore trajectory using the curve method and the three-dimensional graphics rendering technology using the circumferential curve encryption method have effectively solved the problems of complex programming and low software operation efficiency. The three-dimensional rendering can not only reflect the true trajectory of the wellbore, but also reflect the formation information at the casing change and casing damage location. It can be used to evaluate the degree of local damage to the pipe string and provide technical parameters for the study of the mechanism of casing change and casing damage, improving the wellbore trajectory design, and formulating a reasonable perforation and fracturing plan.

[0103] like Figure 8 The figure shows a 3D rendering of a branch shale gas platform well and a multi-arm wellbore along the wellbore trajectory. Y101H3-2, Y101H3-6, and Y101H3-7 are the well names. The platform well carried out arm caliper logging of some well sections of three branch wells. The geological layer of the pipe string damage can be analyzed by mapping the coordinate surface. Figure 8 It can be concluded that casing change and damage are mainly concentrated in the sand fracturing position after family perforation, and the elliptical casing change orientation is basically consistent with the high end of the pipe string, indicating that large-scale sand fracturing in this area will change the original horizontal stress balance of the formation, and the horizontal extrusion of the formation will cause the pipe string to deform toward the high end. Therefore, the three-dimensional visualization modeling of multi-arm wellbore along the wellbore trajectory can provide technical support for the subsequent establishment of a shear mechanics model for casing change and damage and a geological model for shale gas development, and the analysis of ground stress difference, cohesion and internal friction angle, and the critical injection pressure that causes formation sliding combined with oil test data.

[0104] Example 3

[0105] refer to Fig. 9 Based on Example 1, this example proposes a terminal device for a method for three-dimensional modeling of a pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory. The terminal device 200 includes at least one memory 210, at least one processor 220, and a bus 230 connecting different platform systems.

[0106] The memory 210 may include a readable medium in the form of a volatile memory, such as a RAM 211 and / or a cache memory 212 , and may further include a ROM 213 .

[0107] Among them, the memory 210 also stores a computer program, and the computer program can be executed by the processor 220, so that the processor 220 executes the application of any of the above-mentioned multi-arm wellbore diameters along the circumferential curve of the wellbore trajectory pipe string three-dimensional modeling methods in the embodiments of the present application, and its specific implementation method is consistent with the implementation method and the technical effect achieved in the above-mentioned application embodiments, and some contents are not repeated. The memory 210 can also include a program / utility 214 having a group (at least one) of program modules 215, such program modules include but are not limited to: an operating system, one or more application programs, other program modules, and program data, each of these examples or some combination may include the implementation of a network environment.

[0108] Accordingly, the processor 220 may execute the above-mentioned computer programs, and may execute the program / utility 214 .

[0109] The bus 230 may be a bus representing one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures.

[0110] The terminal device 200 may also communicate with one or more external devices 240 such as keyboards, pointing devices, Bluetooth devices, etc., and may also communicate with one or more devices that can interact with the terminal device 200, and / or communicate with any device (such as a router, a modem, etc.) that enables the terminal device 200 to communicate with one or more other computing devices. Such communication may be performed through an I / O interface 250. In addition, the terminal device 200 may also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through a network adapter 260. The network adapter 260 may communicate with other modules of the terminal device 200 through a bus 230. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the terminal device 200, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage platforms, etc.

[0111] Example 3

[0112] refer to Fig.10 This embodiment proposes a computer-readable storage medium for a three-dimensional modeling method of a pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory. Instructions are stored on the computer-readable storage medium. When the instructions are executed by the processor, any of the above-mentioned three-dimensional modeling methods of a pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory is implemented. The specific implementation method is consistent with the implementation method and the technical effect achieved in the above-mentioned application embodiments, and some contents will not be repeated here.

[0113] Fig.10 The program product 300 provided in this embodiment for implementing the above-mentioned application is shown, which can adopt a portable compact disk read-only memory (CD-ROM) and include program code, and can be run on a terminal device, such as a personal computer. However, the program product 300 of the present invention is not limited to this. In this embodiment, the readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it. The program product 300 can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of readable storage media (non-exhaustive list) include: an electrical connection with one or more wires, a portable 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 of the above.

[0114] Computer-readable storage media may include data signals propagated in baseband or as part of a carrier wave, wherein readable program codes are carried. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable storage medium may also be any readable medium other than the readable storage medium, which may send, propagate, or transmit a program used by or in combination with an instruction execution system, an apparatus, or a device. The program code contained on the readable storage medium may be transmitted with any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the above. The program code for performing the operation of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and also conventional procedural programming languages ​​such as "C" language or similar programming languages. The program code may be executed entirely on a user computing device, partially on a user device, as an independent software package, partially on a user computing device, partially on a remote computing device, or entirely on a remote computing device or server. Where a remote computing device is involved, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0115] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A three-dimensional modeling method for pipe strings with multi-arm wellbore diameters along the circumferential curve of the wellbore trajectory, characterized in that: The following steps are involved: S1, multi-arm caliper azimuth correction, the input pipe string inner diameter array data is arranged at each depth point in a group of data according to the high end of the caliper, and the group of data is the data set of all measuring arms of the caliper at the current depth point; S2, multi-arm wellbore centering correction, superimpose the circumferential pipe string radius values ​​of multiple depth points, and calculate the center point of the caliper in the actual logging process through the circle fitting method; S3, wellbore trajectory calculation, the wellbore trajectory is calculated by the broken line method; S4, three-dimensional modeling of the entire well section curve method along the well trajectory, generating a three-dimensional pipe string graph centered on the well trajectory using the correction data calculated in steps S1-S2; S5, rendering a three-dimensional pipe string graphic, using a circumferential encrypted curve method to linearly insert multiple similar curves on the circumference of the pipe string graphic for rendering, to obtain a three-dimensional pipe string rendering graphic; The S2 comprises the following sub-steps: S201, representing a cross section of a depth point in the pipe string in the form of a fitted circle, wherein the radius of the fitted circle represents the average value of the radius of the pipe string at the depth point, the center of the fitted circle represents the center point of the caliper, and the direction of the center of the fitted circle in the coordinate represents the direction of eccentricity of the caliper; S202, obtaining the actual coordinates of the center point of the caliper in the pipe string, and then calculating the distance from the center point of the caliper to all the detection points of the measuring arms as the radius values ​​of all directions of the pipe string at the depth point, and the calculation formula is as follows: in, It represents the corrected engineering value of the i-th sampling point around the well. represents the actual coordinates of the i-th sampling point around the well, Indicates the actual coordinates of the center point. Represents the coordinate scale factor; S203, for each depth point in the measuring well section, the inner diameter array data of the pipe string is fitted by the least square method to obtain the wellbore trajectory, the actual coordinate position of the center point of the caliper in the pipe string is found, and the array caliper curve of the entire well section is centered.

2. The method for three-dimensional modeling of a pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory according to claim 1, characterized in that: The S1 comprises the following sub-steps: S101, record the data of the change in the azimuth of the No. 1 measuring arm relative to the high end of the caliper; S102, calculating the offset of the No. 1 measuring arm relative to the caliper based on the data of the No. 1 measuring arm; the calculation formula of the offset of the No. 1 measuring arm relative to the caliper is as follows: in, represents the azimuth curve value of the No. 1 measuring arm sampled at the lth depth, represents the constant 360, Indicates the number of circumferential curves required for calculating three-dimensional graphics rendering. Indicates the total number of measuring arms of the caliper. Indicates the number of curves after circumferential encryption; S103, calculating the relative positions of the remaining measuring arms on the pipe wall along the X-axis direction based on the offset of the No. 1 measuring arm relative to the caliper.

3. The method for three-dimensional modeling of a pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory according to claim 1, characterized in that: The S3 comprises the following sub-steps: S301, collecting well inclination angle and well inclination azimuth data at different depths in the well through an inclinometer; S302, directly connecting all the depth points in the well in sequence by using the broken line method, performing geometric operations using the well inclination angle and well inclination azimuth data, and calculating the three-dimensional spatial coordinates of different depth points in the well; S303, converting the three-dimensional space coordinates into a wellbore trajectory.

4. The method for three-dimensional modeling of a pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory according to claim 1, characterized in that: The S4 comprises the following sub-steps: S401, scale-shifting the multi-arm caliper array curve, and drawing a plane diagram according to the linear scale required for logging, where different curves in the plane diagram represent the inner diameter values ​​at different positions of the pipe string; S402, the spatial coordinates of different depth points of each curve of the three-dimensional modeling, the spatial coordinate calculation formula is as follows: in, , , represents the coordinates of the wellbore trajectory at the i-th depth point, , , represents the three-dimensional space coordinates of the i-th depth point in the j-th curve, represents the drawing radius, Indicates the standard inner diameter of the pipe string. It represents the multi-arm caliper measurement value of the i-th depth point in the j-th curve after centering correction. represents the constant 3.1415926, Indicates the total number of curves after circumferential encryption, represents the well inclination angle of the i-th depth point; S403, sequentially connecting the spatial coordinates of different depth points of each curve of the three-dimensional modeling in order from top to bottom to form a three-dimensional pipe string graph.

5. The method for three-dimensional modeling of a pipe string with multi-arm wellbore diameters encrypted along the circumferential curve of the wellbore trajectory according to claim 1, characterized in that: The total number of curves of the three-dimensional pipe string rendering graphics in S5 The calculation formula is as follows: in, represents the constant 3.1415926, represents the drawing radius, Indicates the drawing width of a single curve in a graph; Linear interpolation is used to insert similar curves between two adjacent curves. The calculation formula is as follows: in, Indicates the xth curve value inserted between two adjacent curves. Indicates the first curve value of two adjacent curves. Indicates the second curve value of two adjacent curves. Indicates the number of curves that need to be inserted between two adjacent curves.

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