Method, device and equipment for acquiring interval transit time data and storage medium

Abstract

The invention discloses an interval transit time data acquisition method and device, equipment and a storage medium, and belongs to the technical field of oil and gas exploitation. The method comprises the steps that lithologic volume content data of a reference well section corresponding to a to-be-reconstructed well section is obtained, the rock type included in the reference well section is the same as the rock type included in the to-be-reconstructed well section, borehole diameter expansion does not exist in the reference well section, and the lithologic volume content data of the reference well section is used for describing the rock content included in the reference well section; determining a reference coefficient of the to-be-reconstructed well section according to the lithologic volume content data of the reference well section; and determining interval transit time data of the to-be-reconstructed well section according to the lithologic volume content data of the to-be-reconstructed well section and the reference coefficient. According to the method, the lithologic volume content data of the to-be-reconstructed well section cannot be affected even if the to-be-reconstructed well section has borehole diameter expansion, the accuracy of the lithologic volume content data is high, and the interval transit time data reconstructed based on the lithologic volume content data with high accuracy is high in precision.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of oil and gas extraction, and in particular to a method, device, equipment and storage medium for acquiring acoustic wave time difference data. Background Art

[0002] Well seismic calibration is the bridge between earthquakes and geology. Fine well seismic calibration is the basis and prerequisite for stratigraphic interpretation and exploration evaluation. In the process of oil and gas production, it is necessary to obtain acoustic time difference data for well seismic calibration. Among them, acoustic time difference data refers to the time taken by sound waves to propagate a unit distance in the formation. In some cases, the acquired acoustic time difference data will be distorted. For example, in the process of oil and gas production, due to the influence of engineering factors or geological conditions, the borehole diameter of the well section where oil and gas is produced will be enlarged, which will cause the acoustic time difference data corresponding to the well section to be distorted. Since the quality of acoustic time difference data affects the accuracy of well seismic calibration in oil and gas exploration and evaluation, inaccurate well seismic calibration may lead to reservoir structure depth errors, inaccurate reservoir prediction, and unclear understanding of the reservoir. Therefore, a method for obtaining acoustic time difference data is needed to reconstruct the distorted acoustic time difference data when the acoustic time difference data is distorted. Summary of the invention

[0003] The embodiment of the present application provides a method, device, equipment and storage medium for obtaining acoustic wave time difference data, which can be used to re-acquire distorted acoustic wave time difference data. The technical solution is as follows:

[0004] On the one hand, an embodiment of the present application provides a method for obtaining acoustic wave time difference data, the method comprising:

[0005] Acquire wellbore data and drill bit diameter of each initial well section in at least one initial well section;

[0006] Determine an initial well section where borehole diameter expansion occurs from the at least one initial well section according to the well diameter data and the drill bit diameter of each initial well section, and determine the initial well section where borehole diameter expansion occurs as the well section to be reconstructed;

[0007] Obtaining lithologic volume content data of a reference well section corresponding to the well section to be reconstructed, wherein the rock type included in the reference well section is the same as the rock type included in the well section to be reconstructed, and there is no wellbore expansion in the reference well section, and the lithologic volume content data of the reference well section is used to describe the content of the rock included in the reference well section;

[0008] Determining the reference coefficient of the well section to be reconstructed according to the lithology volume content data of the reference well section;

[0009] The acoustic wave time difference data of the well section to be reconstructed is determined according to the lithology volume content data of the well section to be reconstructed and the reference coefficient.

[0010] In a possible implementation, before obtaining the lithology volume content data of the reference well section corresponding to the well section to be reconstructed, the method further includes:

[0011] Determine at least one reference wellbore whose distance from an initial wellbore is not greater than a reference threshold, the initial wellbore being the wellbore where the well section to be reconstructed is located;

[0012] The reference well section is selected from the well section included in the initial wellbore and the well section included in the at least one reference wellbore.

[0013] In a possible implementation, determining the reference coefficient of the well section to be reconstructed according to the lithology volume content data of the reference well section includes:

[0014] Obtaining a reference relationship between the reference coefficient, the acoustic wave time difference data and the lithology volume content data;

[0015] The reference coefficient is calculated based on the lithology volume content data of the reference well section, the acoustic wave time difference data of the reference well section and the reference relationship.

[0016] In a possible implementation, the reference relationship includes: AC θ (C1, C2, ..., C n , SH, por)=θ0+θ1C1+θ2C2+…+θ n C n +θ n+1 SH+θ n+2 por;

[0017] Among them, the AC θ (C1, C2, ..., C n , SH, por) is the acoustic time difference data of the well section to be reconstructed, and the C1, C2, ..., C n , SH, por is the lithology volume content data of the well section to be reconstructed, and the θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, and n is the number of rock types included in the well section to be reconstructed.

[0018] In a possible implementation, the step of calculating the reference coefficient according to the lithology volume content data of the reference well section, the acoustic wave time difference data of the reference well section and the reference relationship includes:

[0019] The reference coefficient is obtained by calculating according to the lithology volume content data of the reference well section, the acoustic time difference data of the reference well section and the reference relationship according to the following formula;

[0020]

[0021] Wherein, the J(θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 ) is the θ0, θ1, θ2,..., θ n ,θ n+1 ,θ n+2 The residual values ​​of θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, n is the number of rock types included in the reference well section, and AC i is the measured value of the acoustic time difference data of the reference well section, i is the sample identifier of the reference well section, is the calculated value of the acoustic time difference data of the reference well section calculated by the reference relationship, SH i ,por i is the lithology volume content data of the reference well section, and m is the number of samples in the reference well section.

[0022] In a possible implementation, the lithology volume content data includes at least one of rock content, mud content and porosity.

[0023] On the other hand, a device for acquiring acoustic wave time difference data is provided, the device comprising:

[0024] An acquisition module, used for acquiring the well diameter data and drill bit diameter of each initial well section in at least one initial well section;

[0025] A determination module, configured to determine an initial well section where borehole diameter expansion occurs from the at least one initial well section according to the well diameter data and the drill bit diameter of each initial well section, and determine the initial well section where borehole diameter expansion occurs as the well section to be reconstructed;

[0026] The acquisition module is further used to acquire lithology volume content data of a reference well section corresponding to the well section to be reconstructed, the rock type included in the reference well section is the same as the rock type included in the well section to be reconstructed, the reference well section does not have a borehole expansion, and the lithology volume content data of the reference well section is used to describe the content of the rock included in the reference well section;

[0027] The determination module is further used to determine the reference coefficient of the well section to be reconstructed according to the lithology volume content data of the reference well section;

[0028] The determination module is further used to determine the acoustic wave time difference data of the well section to be reconstructed according to the lithology volume content data of the well section to be reconstructed and the reference coefficient.

[0029] In a possible implementation, the determination module is further used to determine at least one reference wellbore whose distance from the initial wellbore is not greater than a reference threshold, the initial wellbore being the wellbore in which the well section to be reconstructed is located; and to select the reference well section from the well sections included in the initial wellbore and the well sections included in the at least one reference wellbore.

[0030] In a possible implementation, the determination module is used to obtain a reference relationship between the reference coefficient, the acoustic time difference data and the lithology volume content data; and the reference coefficient is calculated based on the lithology volume content data of the reference well section, the acoustic time difference data of the reference well section and the reference relationship.

[0031] In a possible implementation, the reference relationship includes: AC θ (C1, C2, ..., C n , SH, por)=θ0+θ1C1+θ2C2+…+θ n C n +θ n+1 SH+θ n+2 por; wherein the AC θ (C1, C2, ..., C n , SH, por) is the acoustic time difference data of the well section to be reconstructed, and the C1, C2, ..., C n , SH, por is the lithology volume content data of the well section to be reconstructed, and the θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, and n is the number of rock types included in the well section to be reconstructed.

[0032] In a possible implementation, the determination module is used to calculate the reference coefficient according to the lithology volume content data of the reference well section, the acoustic wave time difference data of the reference well section and the reference relationship according to the following formula;

[0033] Wherein, the J(θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2) is the θ0, θ1, θ2,..., θ n ,θ n+1 ,θ n+2 The residual values ​​of θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, n is the number of rock types included in the reference well section, and AC i is the measured value of the acoustic time difference data of the reference well section, i is the sample identifier of the reference well section, is the calculated value of the acoustic time difference data of the reference well section calculated by the reference relationship, SH i ,por i is the lithology volume content data of the reference well section, and m is the number of samples in the reference well section.

[0034] In a possible implementation, the lithology volume content data includes at least one of rock content, mud content and porosity.

[0035] On the other hand, a computer device is provided, comprising a processor and a memory, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by the processor so that the computer device implements any of the above-mentioned methods for obtaining acoustic wave time difference data.

[0036] On the other hand, a computer-readable storage medium is also provided, wherein at least one computer program is stored in the computer-readable storage medium, and the at least one computer program is loaded and executed by a processor so that a computer implements any of the above-mentioned methods for obtaining acoustic wave time difference data.

[0037] On the other hand, a computer program product or a computer program is also provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes any of the above-mentioned methods for acquiring acoustic wave time difference data.

[0038] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0039] Even if the borehole diameter is enlarged in the well section to be reconstructed, it will not affect the lithology volume content data of the well section to be reconstructed. The accuracy of the lithology volume content data is high, and the sonic time difference data reconstructed based on the high-accuracy lithology volume content data is highly accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 It is a schematic diagram of an implementation environment provided by an embodiment of the present application;

[0042] Figure 2 This is a flow chart of a method for obtaining acoustic time difference data provided by an embodiment of the present application;

[0043] Figure 3 It is a cross-sectional schematic diagram of a logging result column of a well section to be reconstructed provided in an embodiment of the present application;

[0044] Figure 4 It is a schematic cross-sectional diagram of a logging result column of a reference well section provided in an embodiment of the present application;

[0045] Figure 5 This is a comparison diagram of the effects of synthetic seismic calibration provided in an embodiment of the present application;

[0046] Figure 6 It is a structural schematic diagram of a device for acquiring a time difference of sound waves provided in an embodiment of the present application;

[0047] Figure 7 It is a structural diagram of a server provided in an embodiment of the present application;

[0048] Figure 8 It is a structural schematic diagram of a sound wave time difference acquisition device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0050] This application embodiment provides a method for obtaining acoustic wave time difference data, please refer to Figure 1 , which shows a schematic diagram of an implementation environment of the method provided in an embodiment of the present application. The implementation environment may include: a terminal 11 and a server 12.

[0051] Exemplarily, the method can be independently executed by the terminal 11 or the server 12, or can be interactively executed by the terminal 11 and the server 12. The interactive execution process of the terminal 11 and the server 12 is, for example, that the terminal 11 is installed with an application that can obtain the wellbore data and drill bit diameter of the initial well section. After the application obtains the wellbore data and the drill bit diameter, the obtained wellbore data and the drill bit diameter can be sent to the server 12. The server 12 determines the well section to be reconstructed from the initial well section based on the wellbore data and the drill bit diameter based on the method for obtaining the acoustic wave time difference data provided in the embodiment of the present application. Afterwards, the server 12 can obtain the acoustic wave time difference data of the well section to be reconstructed. Alternatively, the server 12 sends the information of the well section to be reconstructed to the terminal 11, and the terminal 11 determines the well section to be reconstructed based on the received information and obtains the acoustic wave time difference data of the well section to be reconstructed.

[0052] Optionally, the terminal 11 can be any electronic product that can interact with the user through one or more methods such as keyboard, touchpad, touch screen, remote control, voice interaction or handwriting device, such as PC (Personal Computer), mobile phone, smart phone, PDA (Personal Digital Assistant), wearable device, PPC (Pocket PC), tablet computer, smart car machine, smart TV, smart speaker, etc. The server 12 can be a server, a server cluster composed of multiple servers, or a cloud computing service center. The terminal 11 establishes a communication connection with the server 12 through a wired or wireless network.

[0053] Those skilled in the art should understand that the above-mentioned terminal 11 and server 12 are only examples, and other existing or future terminals or servers that are applicable to the present application should also be included in the protection scope of the present application and are included here by reference.

[0054] The present application embodiment provides a method for obtaining acoustic wave time difference data. The method for obtaining acoustic wave time difference data can be based on the above Figure 1 In the implementation environment shown, the method can be executed by the server 12, and the flowchart of the method is as follows Figure 2 As shown, the method includes steps 201 to 205.

[0055] In step 201, wellbore data and drill bit diameter of each initial well section in at least one initial well section are obtained.

[0056] In a possible implementation, before mining underground, it is necessary to drill a well in the stratum to mine the underground materials to the surface. The mined materials may be oil, natural gas or other minerals, and the holes drilled from the ground to the stratum during the drilling process may be called initial drilling.

[0057] For example, an initial well drilling may include multiple initial well sections. The embodiment of the present application does not limit the division method of the initial well sections included in the initial well drilling. The well section length can be determined based on experience, and the wellhead or bottom of the initial well drilling is used as the starting point, and each interval of a well section length is divided into an initial well section to obtain multiple initial well sections.

[0058] Regardless of the method used by the server to divide the initial well section, the initial well section can be monitored to determine whether an abnormality occurs in the initial well section. An abnormality in the initial well section may be caused by, for example, geological collapse due to engineering factors or geological conditions, which in turn leads to borehole expansion in the initial well section. With respect to borehole expansion, the server can obtain the well diameter data and drill bit diameter of each initial well section to determine whether borehole expansion occurs in the initial well section based on the well diameter data and drill bit diameter.

[0059] For example, the wellbore caliper data can be obtained by measuring with an instrument, for example, during the drilling process, the diameter of each section of the initial wellbore is measured with an instrument to obtain the wellbore caliper data of the initial wellbore section. Alternatively, after the initial wellbore is completed, the diameter of each section of the initial wellbore is measured with an instrument to obtain the wellbore caliper data of the initial wellbore section.

[0060] In one possible case, the drilling object will record the drilling process during the initial drilling process and obtain a drilling report. The drilling report records the drill bit used for each initial well section, and the server can determine the drill bit diameter of each initial well section based on the drilling report. In the case where the drilling report is a set of data stored in a storage space, the server can access the storage space, read the drilling report, and obtain the drill bit diameter of each initial well section. The storage space for storing the drilling report can be the storage space of the server or the storage space of other devices. The other device can be a network device connected to the server through a wired or wireless network. Alternatively, the drilling report is manually consulted to obtain the drill bit diameter of each initial well section, and the information input control provided by the server is used to input the drill bit diameter of each initial well section obtained by consulting to the server.

[0061] In step 202, an initial well section where borehole diameter expansion occurs is determined from at least one initial well section according to the well diameter data and drill bit diameter of each initial well section, and the initial well section where borehole diameter expansion occurs is determined as the well section to be reconstructed.

[0062] Since drilling is done by applying a certain pressure to the drill bit included in the drilling equipment, the blade of the drill bit breaks the bottom rock of the well to complete the drilling. Therefore, the difference between the borehole diameter data of each initial well section and the drill bit diameter should be within the error range, and the error range can be indicated by an error constant. Among them, the error constant can be any value set based on experience and implementation environment, and the implementation environment can be the geological composition of the initial well section. For example, the error constant is set to 6 cm (centimeter) based on experience and implementation environment. The server can use Formula 1 to determine the initial well section where the wellbore expansion occurs from multiple initial well sections.

[0063] (CAL-d)≥ε (Formula 1)

[0064] Wherein, CAL refers to the borehole diameter data of the initial well section, d refers to the drill bit diameter of the drill bit used in the initial well section, and ε refers to the error constant. When the borehole diameter data, drill bit diameter and error constant of the initial well section do not satisfy the calculation relationship of Formula 1, it is determined that the difference between the borehole diameter data and the drill bit diameter of the initial well section is within the error range, and the borehole diameter expansion does not occur in the initial well section. When the borehole diameter data, drill bit diameter and error constant of the initial well section satisfy the calculation relationship of Formula 1, it is determined that the difference between the borehole diameter data and the drill bit diameter of the initial well section exceeds the error range, and the borehole diameter expansion occurs in the initial well section.

[0065] When a borehole expansion occurs in an initial well section, the acoustic time difference data of the initial well section will also be distorted due to the borehole expansion, and the accuracy will decrease. Therefore, the acoustic time difference data of the initial well section needs to be reconstructed, and the server can determine the initial well section where the borehole expansion occurs as the well section to be reconstructed.

[0066] The above is a process of first dividing the initial well section and then determining the well section to be reconstructed. In one possible case, the server can directly obtain the wellbore data and drill bit diameter corresponding to the unit depth of the initial drilling, substitute the wellbore data and drill bit diameter of each unit depth into Formula 1, determine a section of initial drilling where wellbore expansion occurs, and determine the determined initial drilling section as the well section to be reconstructed.

[0067] Figure 3 A schematic cross-sectional diagram of a well logging result column of initial drilling provided in an embodiment of the present application, Figure 3 The acoustic time difference curve AC (μs / m (microsecond / m, microsecond / meter)), the caliper curve CAL (cm) and the lithology volume content data of the initial drilling depth of 3809.875m (meter)-4940.75m are shown in FIG. The server can determine the acoustic time difference data and caliper data corresponding to the initial drilling at each depth through the acoustic time difference curve and the caliper curve. In some cases, the acoustic time difference curve and the caliper curve can be called the acoustic time difference data and the caliper data.

[0068] The drill bit diameter d at different initial well sections is 20 cm, the error constant ε is 6 cm, and the well diameter data is Figure 3 In the case shown, determine Figure 3 The difference between the wellbore data and the drill bit diameter at the 4562.375m-4644m section of the initial drilling is not within the error range and belongs to the well section to be reconstructed. Figure 3 The dotted frame is used to mark the well section to be reconstructed in the initial drilling.

[0069] In step 203, the lithologic volume content data of the reference well section corresponding to the well section to be reconstructed is obtained. The rock types included in the reference well section are the same as the rock types included in the well section to be reconstructed. There is no wellbore expansion in the reference well section. The lithologic volume content data of the reference well section is used to describe the content of the rock included in the reference well section.

[0070] In one possible case, the server needs to determine a reference well section corresponding to the well section to be reconstructed, and the determination process includes: determining at least one reference well whose distance from the initial well is not greater than a reference threshold, the initial well being the well where the well section to be reconstructed is located; and selecting a reference well section from the well sections included in the initial well and the well sections included in at least one reference well.

[0071] The reference threshold is a value of any size and length unit set based on experience and implementation environment, and the implementation environment is, for example, the mean diameter of the initial well section of the initial drilling. The server obtains the position coordinates of the initial drilling, and counts the position coordinates of other wells other than the initial drilling, and calculates the distance between the other wells and the initial drilling based on the position coordinates of the initial drilling and the position coordinates of the other wells. When the distance between the other wells and the initial drilling is not greater than the reference threshold, it is determined that the other wells are close to the initial drilling and can be determined as the reference drilling.

[0072] Alternatively, the server may determine a circular reference area with the initial well as the center and the reference threshold as the radius, and determine the well located in the reference area as the reference well close to the initial well. Regardless of the method used by the server to determine the reference well, the reference well section may be selected from the well sections included in the initial well and the reference well.

[0073] Exemplarily, the server counts the rock types included in the well sections included in the initial drilling and the reference drilling. When the rock type of the well section is the same as the rock type of the well section to be reconstructed, and the well section does not have abnormal problems of wellbore expansion, the server determines that the well section is the reference well section corresponding to the well section to be reconstructed.

[0074] Continue with Figure 3 Taking the well section to be reconstructed as an example, Figure 3Although the initial drilling includes sandstone, siltstone and basalt, the content of sandstone and siltstone in the well section to be reconstructed is 0, that is, the rock included in the well section to be reconstructed is basalt. Therefore, the reference well section is also a well section including basalt. Figure 4 A schematic cross-sectional diagram of a logging result column of a reference well section provided in an embodiment of the present application, Figure 4 The well section marked by the dashed line box includes basalt, but does not include sandstone and siltstone, and there is no borehole expansion in this well section. Figure 4 The well section 4789m-4801.125m marked by the middle dotted box is determined as the reference well section for the well section to be reconstructed.

[0075] After the server determines the reference well section, the lithology volume content data of the reference well section can be obtained. The process of obtaining the lithology volume content data is similar to the process of obtaining the wellbore data, and reference can be made to the relevant description in step 201. The embodiment of the present application does not limit the data included in the lithology volume content data, and may include at least one of the rock content, mud content, and porosity per unit volume of the reference well section.

[0076] In one possible case, a reference well section corresponds to at least one set of lithologic volume content data. For example, for a reference well section, multiple sampling points can be selected, and the rock content, mud content, porosity, etc. can be measured from the multiple sampling points using measurement equipment to obtain a set of lithologic volume content data. The sampling points can be selected randomly, or the sampling threshold can be set based on experience, and the sampling point measurement is performed once every sampling threshold.

[0077] In addition, in addition to directly measuring the lithology volume content data at the sampling point, the RT (resistivity) curve, AC acoustic time difference curve, GR (natural gamma-ray) curve, compensated neutron curve, SP (spontaneous potential) curve and logging data related to lithology at the sampling point can also be measured to perform mathematical relationship conversion on the measured data to indirectly obtain the rock volume content data. Exemplarily, the server can choose to directly measure the lithology volume content data, or can choose to indirectly measure the lithology volume content data, or can use the above two methods to measure the lithology volume content data, and the embodiment of the present application does not limit the number of lithology volume content data of the reference well section measured, which can be any positive integer.

[0078] After obtaining the lithology volume content data corresponding to the reference well section, the server may directly perform the operation of step 204 according to the lithology volume content data, or may pre-process the lithology volume content data to delete abnormal data in the lithology volume content data.

[0079] Among them, the preprocessing can be to construct a histogram based on the lithology volume content data, indicate the data distribution of the lithology volume content data through the histogram, determine the data in the histogram whose data distribution fluctuation exceeds the fluctuation threshold as abnormal data, and delete it. The fluctuation threshold can be a value of any size set based on experience. By deleting the abnormal data, it is avoided to use the abnormal data to determine the acoustic time difference curve of the well section to be reconstructed, resulting in a decrease in the quality of the determined acoustic time difference defects. Optionally, the server deletes the abnormal data from the lithology volume content data of multiple groups of reference well sections to obtain 98 groups of lithology volume content data that can be calculated.

[0080] In step 204, a reference coefficient of the well section to be reconstructed is determined based on the lithology volume content data of the reference well section.

[0081] In one possible implementation, the process of determining the reference coefficient by the server includes: obtaining a reference relationship among the reference coefficient, acoustic wave time difference data and lithology volume content data; and calculating the reference coefficient based on the lithology volume content data of the reference well section, the acoustic wave time difference data of the reference well section and the reference relationship.

[0082] Exemplarily, the acoustic time difference data refers to the time taken by the acoustic wave to propagate a unit distance in the formation. In some cases, the acoustic time difference data can be understood as the inverse of the propagation rate of the acoustic wave, that is, the acoustic time difference data is related to the propagation rate of the acoustic wave. The propagation rate of the acoustic wave in the formation is affected by the lithology of the formation. For example, the content of different types of rocks in the formation, the mud content and the porosity in the rock will affect the propagation rate of the acoustic wave. Therefore, there is an operational relationship between the acoustic time difference data and the lithology volume content data used to reflect the lithology of the formation, that is, a reference relationship, and the acoustic time difference data can be calculated based on the lithology volume content data. The server can construct a reference relationship between the lithology volume content data and the acoustic time difference data. The constructed reference relationship is shown in Formula 2, for example.

[0083] AC θ (C1, C2, ..., C n , SH, por)=θ0+θ1C1+θ2C2+...+θ n C n +

[0084] θ n+1 SH+θ n+2 por (Formula 2)

[0085] Among them, AC θ (C1, C2, ..., C n , SH,por) is the acoustic time difference data of the well section to be reconstructed, C1, C2, ..., C nis the rock content of different rocks, n is a positive integer used to identify different rocks, SH is the mud content, por is the porosity, θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient to be solved.

[0086] against Figure 3 The initial well shown in the figure includes three types of rocks: sandstone, siltstone and basalt. The n in Formula 2 is 3, and the formula 2 corresponding to the initial well is AC θ (C1, C2, C3, SH, por) = θ0 + θ1C1 + θ2C2 + θ3C3 + θ4SH + θ5por, among which, C1 is the sandstone content, C2 is the siltstone content, C3 is the basalt content, SH is the mud content, por is the porosity, and θ0, θ1, θ2, θ3, θ4, θ5 are reference coefficients to be solved.

[0087] Since the rock type of the reference well section is the same as that of the well section to be reconstructed, and the reference well section is close to the well section to be reconstructed, the propagation of the acoustic wave in the reference well section is similar to that in the well section to be reconstructed. However, there is no borehole expansion in the reference well section, and the acoustic wave time difference data of the reference well section is the correct value that does not need to be reconstructed. Therefore, the reference relationship between the acoustic wave time difference data and the lithology volume content data in the well section to be reconstructed, that is, the reference coefficient, can be solved based on the acoustic wave time difference data and the lithology volume content data of the reference well section.

[0088] In one possible case, the server uses the least square method to fit the reference coefficient. The calculation formula of the least square method is shown in Formula 3, for example.

[0089]

[0090] In formula 3, J(θ0, θ1, θ2,..., θ n ,θ n+1 ,θ n+2 ) are θ0, θ1, θ2,..., θ n ,θ n+1 ,θ n+2 The residual values ​​of θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, n is the number of rock types, AC i is the measured value of the acoustic time difference data of the reference well section, i is the sample identifier of the reference well section, is the calculated value of the acoustic time difference data fitted by formula 2, SH i ,por iis the lithology volume content data of the reference well section, and m is the number of samples in the reference well section.

[0091] Continuing to use the reference well section in the above embodiment as an example to illustrate the process of calculating the reference coefficient using formula 3, where m is the number of samples equal to 98, and the rock types are sandstone, siltstone and basalt, that is, n is equal to 3. Among them, C1 is the sandstone content, C2 is the siltstone content, and C3 is the basalt content. The reference coefficients to be solved in formula 3 are θ0, θ1, θ2, θ3, θ4, and θ5. Since the sandstone content and siltstone content of the reference well section are both 0, formula 3 can be expressed as

[0092] The server estimates θ0, θ3, θ4, and θ5 included in Formula 2, and determines the calculated value of the acoustic time difference data by referring to the lithologic volume content data of the reference well section and the estimated Formula 2. After that, the residual between the measured value and the calculated value of the 98 sets of acoustic time difference data is determined. When the residual is the smallest, the estimated values ​​of θ0, θ3, θ4, and θ5 in Formula 2 are determined to be the optimal estimated values, and the optimal estimated values ​​are determined as the values ​​of the reference coefficients. The server adopts Figure 4 The sonic time difference data shown and the basalt content, mud content and porosity are calculated to obtain θ0=0, θ3=1.7129, θ4=3.1247, θ5=2.2917.

[0093] In step 205, the acoustic time difference data of the well section to be reconstructed is determined according to the lithology volume content data of the well section to be reconstructed and the reference coefficient.

[0094] After determining the reference coefficients in Formula 2, the server substitutes the determined reference coefficients into Formula 2 to obtain the acoustic time difference reconstruction equation corresponding to the well section to be reconstructed. The acoustic time difference reconstruction equation is, for example, AC θ (C3, SH, por) = 1.7129C3 + 3.1247SH + 2.2917por. Afterwards, the lithologic volume content data of the well section to be reconstructed are respectively substituted into the acoustic time difference reconstruction equation, the reference coefficient and the corresponding lithologic volume content data are multiplied to obtain three products, and the three products are added to obtain the acoustic time difference data. Similar to the situation that a reference well section can correspond to at least one set of lithologic volume content data, the well section to be reconstructed can also correspond to at least one set of lithologic volume content data. In addition, the server can also determine the abnormal data in the lithologic volume content data of the well section to be reconstructed and delete the abnormal data. The deletion process is similar to the deletion process of the lithologic volume content data of the reference well section. Please refer to the relevant description in step 203, which will not be repeated here.

[0095] Optionally, the number of samples of the well section to be reconstructed is k, and the server can substitute k groups of lithology volume content data into the acoustic time difference reconstruction equation to obtain k acoustic time difference data AC θ (C3, SH, por) k . Figure 3 In the equation, k is 654. Figure 3 The dotted line in the figure shows the acoustic time difference data reconstructed using the acoustic time difference reconstruction equation. Figure 3 It can be seen that the reconstructed acoustic transit time data restores the logging characteristics of low acoustic transit time in basalt reservoirs.

[0096] In a possible implementation, after calculating the acoustic wave time difference data of the well section to be reconstructed, the server will perform substitution and splicing on the calculated acoustic wave time difference data and the original acoustic wave time difference data. The substitution equation is shown in Formula 4, for example.

[0097]

[0098] In formula 4, CAL indicates the wellbore data, d indicates the drill bit diameter, and ε indicates the error constant. When the difference between the wellbore data and the drill bit diameter of a well section is less than the error constant, it means that there is no wellbore expansion in the well section, and the original acoustic time difference data of the well section is not distorted. Therefore, the original acoustic time difference data AC 原始 When the difference between the borehole diameter data of a well section and the drill bit is not less than the error constant, it means that the wellbore diameter is enlarged in the well section, and the original acoustic wave time difference data of the well section is distorted. It is necessary to use the method of the embodiment of the present application to obtain the reconstructed acoustic wave time difference data AC of the well section. 重构 , and determine the reconstructed acoustic wave time difference data as the acoustic wave time difference data of the well section.

[0099] By using Formula 4, the reconstructed acoustic time difference data is substituted for the original acoustic time difference data of the well section to be reconstructed, and the acoustic time difference data of the initial drilling is obtained, for example: Figure 3 As shown, the acoustic wave time difference data are replaced by formula 4, and the acoustic wave time difference data of the initial drilling are obtained as the solid line acoustic wave time difference data outside the dotted line frame and the dotted line acoustic wave time difference data within the dotted line frame.

[0100] After reconstructing the acoustic wave time difference data, the server can use the reconstructed acoustic wave time difference data to perform synthetic seismic calibration. Figure 5 A comparison diagram of the effects of synthetic seismic calibration provided in an embodiment of the present application, Figure 5 The well section marked by the dotted line frame in the figure is the well section to be reconstructed. Figure 5 The figure above shows the effect of synthetic seismic calibration using acoustic wave time difference data before reconstruction. Figure 5 The figure below shows the effect of synthetic seismic calibration using reconstructed acoustic wave time difference data. Figure 5 The figures show the acoustic time difference data (AC), GR (natural gamma-ray) curve, RT (resistivity) curve, DEN (density) curve, CAL curve, wave impedance curve, reflection coefficient curve, acoustic wave transmission time and arrival depth, drilling lithology combination, synthetic seismic record and wellside seismic record.

[0101] Figure 5 The unit of AC is μs / m, the unit of GR curve is API (calibrated well), the unit of RT curve is ohm-m (ohm-meter), the unit of CAL curve is cm, and the unit of wave impedance curve is m / s×g / cm 3 (gram / cm 3 , g / cm3), Figure 5 The two end values ​​in indicate the values ​​of the origin and end point of the column profile diagram of the curve.

[0102] Combination Figure 5 As shown in the figure above, the correlation between the synthetic seismic records of the well section to be reconstructed with the wellbore expansion and the seismic records near the well is poor, with a correlation of only 0.27. Figure 5 The figure below shows that the correlation between the synthetic seismic records of the well section to be reconstructed and the seismic records near the well reaches 0.85. By reconstructing the acoustic wave time difference data, the accuracy of synthetic seismic calibration is improved.

[0103] In summary, the method for obtaining acoustic time difference data provided by the embodiment of the present application will not affect the lithologic volume content data of the well section to be reconstructed even if the borehole diameter is enlarged in the well section to be reconstructed, and the accuracy of the lithologic volume content data is high. The acoustic time difference data reconstructed based on the lithologic volume content data with high accuracy has high precision. Since the distance between the reference well where the reference well section is located and the initial well where the well section to be reconstructed is located is less than the reference threshold, the reference well section is close to the well section to be reconstructed, and the reference coefficient determined based on the reference well section with a close distance and the same type has high accuracy. The acoustic time difference data is subsequently reconstructed using the reference coefficient, and the reconstruction process of the acoustic time difference data is simple and efficient.

[0104] See also Figure 6 The embodiment of the present application provides a device for acquiring acoustic wave time difference data, the device comprising:

[0105] An acquisition module 601 is used to acquire the wellbore data and drill bit diameter of each initial well section in at least one initial well section;

[0106] A determination module 602 is used to determine an initial well section where wellbore expansion occurs from at least one initial well section according to the wellbore data and the drill bit diameter of each initial well section, and determine the initial well section where wellbore expansion occurs as the well section to be reconstructed;

[0107] The acquisition module 601 is further used to acquire the lithology volume content data of the reference well section corresponding to the well section to be reconstructed, the rock type included in the reference well section is the same as the rock type included in the well section to be reconstructed, and there is no wellbore expansion in the reference well section. The lithology volume content data of the reference well section is used to describe the content of the rock included in the reference well section;

[0108] The determination module 602 is further used to determine the reference coefficient of the well section to be reconstructed according to the lithology volume content data of the reference well section;

[0109] The determination module 602 is further used to determine the acoustic time difference data of the well section to be reconstructed according to the lithology volume content data of the well section to be reconstructed and the reference coefficient.

[0110] In one possible implementation, the determination module 602 is further used to determine at least one reference wellbore whose distance from the initial wellbore is not greater than a reference threshold, the initial wellbore being the wellbore where the well section to be reconstructed is located; and select a reference well section from the well sections included in the initial wellbore and the well sections included in at least one reference wellbore.

[0111] In a possible implementation, the determination module 602 is used to obtain a reference coefficient, a reference relationship between acoustic wave time difference data and lithology volume content data; and the reference coefficient is calculated based on the lithology volume content data of the reference well section, the acoustic wave time difference data of the reference well section and the reference relationship.

[0112] In a possible implementation, the reference relationship includes: AC θ (C1, C2, ..., C n , SH, por)=θ0+θ1C1+θ2C2+…+θ n C n +θ n+1 SH+θ n+2 por; among them, AC θ (C1, C2, ..., C n , SH,por) is the acoustic time difference data of the well section to be reconstructed, C1, C2, ..., C n , SH, por is the lithology volume content data of the well section to be reconstructed, θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, and n is the number of rock types included in the well section to be reconstructed.

[0113] In a possible implementation, the determination module 602 is used to calculate the reference coefficient according to the lithology volume content data of the reference well section, the acoustic wave time difference data of the reference well section and the reference relationship according to the following formula;

[0114] Among them, J(θ0, θ1, θ2,..., θ n ,θ n+1 ,θ n+2 ) are θ0, θ1, θ2,..., θ n ,θ n+1 ,θ n+2 The residual values ​​of θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, n is the number of rock types included in the reference well section, AC i is the measured value of the acoustic time difference data of the reference well section, i is the sample identifier of the reference well section, is the calculated value of the acoustic time difference data of the reference well section calculated by the reference relationship, SH i ,por i is the lithology volume content data of the reference well section, and m is the number of samples in the reference well section.

[0115] In a possible implementation, the lithology volume content data includes at least one of rock content, mud content and porosity.

[0116] Even if the borehole diameter is enlarged in the well section to be reconstructed, it will not affect the lithology volume content data of the well section to be reconstructed. The accuracy of the lithology volume content data is high, and the sonic time difference data reconstructed based on the high-accuracy lithology volume content data is highly accurate.

[0117] It should be noted that the device provided in the above embodiment only uses the division of the above functional modules as an example to implement its functions. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiment belong to the same concept, and their specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0118] Figure 7It is a structural diagram of a server provided in an embodiment of the present application. The server may have relatively large differences due to different configurations or performances, and may include one or more processors 701 and one or more memories 702, wherein at least one computer program is stored in the one or more memories 702, and the at least one computer program is loaded and executed by the one or more processors 701, so that the server implements the method for obtaining the acoustic wave time difference data provided in the above-mentioned various method embodiments, and the processor 701 is, for example, a central processing unit (CPU). Of course, the server may also have components such as a wired or wireless network interface, a keyboard, and an input and output interface for input and output, and the server may also include other components for implementing device functions, which will not be repeated here.

[0119] Figure 8 1 is a schematic diagram of a device for acquiring acoustic time difference data provided in an embodiment of the present application. The device may be a terminal, such as a smart phone, a tablet computer, a player, a laptop computer or a desktop computer. The terminal may also be referred to as a user device, a portable terminal, a laptop terminal, a desktop terminal or other names.

[0120] Typically, the terminal includes: a processor 801 and a memory 802 .

[0121] The processor 801 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 801 may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor 801 may also include a main processor and a coprocessor. The main processor is a processor for processing data in an awake state, also known as a CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 801 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 801 may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0122] The memory 802 may include one or more computer-readable storage media, which may be non-transitory. The memory 802 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 802 is used to store at least one instruction, which is used to be executed by the processor 801 so that the terminal implements the method for obtaining the acoustic wave time difference data provided in the method embodiment of the present application.

[0123] In some embodiments, the terminal may further optionally include: a peripheral device interface 803 and at least one peripheral device. The processor 801, the memory 802 and the peripheral device interface 803 may be connected via a bus or a signal line. Each peripheral device may be connected to the peripheral device interface 803 via a bus, a signal line or a circuit board. Specifically, the peripheral device includes: at least one of a radio frequency circuit 804, a display screen 805, a camera assembly 806, an audio circuit 807 and a power supply 808.

[0124] The peripheral device interface 803 may be used to connect at least one peripheral device related to I / O (Input / Output) to the processor 801 and the memory 802. In some embodiments, the processor 801, the memory 802, and the peripheral device interface 803 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 801, the memory 802, and the peripheral device interface 803 may be implemented on a separate chip or circuit board, which is not limited in this embodiment.

[0125] The radio frequency circuit 804 is used to receive and transmit RF (Radio Frequency) signals, also known as electromagnetic signals. The radio frequency circuit 804 communicates with communication networks and other communication devices through electromagnetic signals. The radio frequency circuit 804 converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals into electrical signals. Optionally, the radio frequency circuit 804 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a user identity module card, and the like. The radio frequency circuit 804 can communicate with other terminals through at least one wireless communication protocol. The wireless communication protocol includes, but is not limited to: a metropolitan area network, various generations of mobile communication networks (2G, 3G, 4G and 5G), a wireless local area network and / or a WiFi (Wireless Fidelity) network. In some embodiments, the radio frequency circuit 804 may also include circuits related to NFC (Near Field Communication), which is not limited in this application.

[0126] The display screen 805 is used to display the UI (User Interface). The UI may include graphics, text, icons, videos and any combination thereof. When the display screen 805 is a touch display screen, the display screen 805 also has the ability to collect touch signals on the surface or above the surface of the display screen 805. The touch signal can be input to the processor 801 as a control signal for processing. At this time, the display screen 805 can also be used to provide virtual buttons and / or virtual keyboards, also known as soft buttons and / or soft keyboards. In some embodiments, the display screen 805 can be one, set on the front panel of the terminal; in other embodiments, the display screen 805 can be at least two, respectively set on different surfaces of the terminal or in a folding design; in other embodiments, the display screen 805 can be a flexible display screen, set on a curved surface or a folding surface of the terminal. Even, the display screen 805 can also be set to a non-rectangular irregular shape, that is, a special-shaped screen. The display screen 805 can be made of materials such as LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode) and the like.

[0127] The camera assembly 806 is used to capture images or videos. Optionally, the camera assembly 806 includes a front camera and a rear camera. Typically, the front camera is arranged on the front panel of the terminal, and the rear camera is arranged on the back of the terminal. In some embodiments, there are at least two rear cameras, which are any one of a main camera, a depth of field camera, a wide-angle camera, and a telephoto camera, so as to realize the fusion of the main camera and the depth of field camera to realize the background blur function, the fusion of the main camera and the wide-angle camera to realize panoramic shooting and VR (Virtual Reality) shooting function or other fusion shooting functions. In some embodiments, the camera assembly 806 may also include a flash. The flash can be a monochrome temperature flash or a dual-color temperature flash. A dual-color temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation at different color temperatures.

[0128] The audio circuit 807 may include a microphone and a speaker. The microphone is used to collect sound waves from the user and the environment, and convert the sound waves into electrical signals and input them into the processor 801 for processing, or input them into the radio frequency circuit 804 to achieve voice communication. For the purpose of stereo acquisition or noise reduction, there may be multiple microphones, which are respectively arranged at different parts of the terminal. The microphone may also be an array microphone or an omnidirectional acquisition microphone. The speaker is used to convert the electrical signal from the processor 801 or the radio frequency circuit 804 into sound waves. The speaker may be a traditional film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert the electrical signal into sound waves audible to humans, but also convert the electrical signal into sound waves inaudible to humans for purposes such as ranging. In some embodiments, the audio circuit 807 may also include a headphone jack.

[0129] The power supply 808 is used to power various components in the terminal. The power supply 808 can be an alternating current, a direct current, a disposable battery, or a rechargeable battery. When the power supply 808 includes a rechargeable battery, the rechargeable battery can support wired charging or wireless charging. The rechargeable battery can also be used to support fast charging technology.

[0130] In some embodiments, the terminal further includes one or more sensors 809 , including but not limited to: an acceleration sensor 810 , a gyroscope sensor 811 , a pressure sensor 812 , an optical sensor 813 , and a proximity sensor 814 .

[0131] The acceleration sensor 810 can detect the magnitude of acceleration on the three coordinate axes of the coordinate system established by the terminal. For example, the acceleration sensor 810 can be used to detect the components of gravity acceleration on the three coordinate axes. The processor 801 can control the display screen 805 to display the user interface in a horizontal view or a vertical view according to the gravity acceleration signal collected by the acceleration sensor 810. The acceleration sensor 810 can also be used to collect motion data of games or users.

[0132] The gyroscope sensor 811 can detect the body direction and rotation angle of the terminal, and the gyroscope sensor 811 can cooperate with the acceleration sensor 810 to collect the user's 3D actions on the terminal. The processor 801 can implement the following functions based on the data collected by the gyroscope sensor 811: motion sensing (such as changing the UI according to the user's tilt operation), image stabilization during shooting, game control, and inertial navigation.

[0133] The pressure sensor 812 can be set in the side frame of the terminal and / or the lower layer of the display screen 805. When the pressure sensor 812 is set in the side frame of the terminal, it can detect the user's holding signal of the terminal, and the processor 801 performs left and right hand recognition or shortcut operation according to the holding signal collected by the pressure sensor 812. When the pressure sensor 812 is set in the lower layer of the display screen 805, the processor 801 controls the operability controls on the UI interface according to the user's pressure operation on the display screen 805. The operability controls include at least one of a button control, a scroll bar control, an icon control, and a menu control.

[0134] The optical sensor 813 is used to collect the ambient light intensity. In one embodiment, the processor 801 can control the display brightness of the display screen 805 according to the ambient light intensity collected by the optical sensor 813. Specifically, when the ambient light intensity is high, the display brightness of the display screen 805 is increased; when the ambient light intensity is low, the display brightness of the display screen 805 is reduced. In another embodiment, the processor 801 can also dynamically adjust the shooting parameters of the camera component 806 according to the ambient light intensity collected by the optical sensor 813.

[0135] The proximity sensor 814, also known as a distance sensor, is usually arranged on the front panel of the terminal. The proximity sensor 814 is used to collect the distance between the user and the front of the terminal. In one embodiment, when the proximity sensor 814 detects that the distance between the user and the front of the terminal is gradually decreasing, the processor 801 controls the display screen 805 to switch from the screen-on state to the screen-off state; when the proximity sensor 814 detects that the distance between the user and the front of the terminal is gradually increasing, the processor 801 controls the display screen 805 to switch from the screen-off state to the screen-on state.

[0136] Those skilled in the art will understand that Figure 8 The structure shown in the figure does not constitute a limitation on the device for acquiring acoustic wave time difference data, and may include more or less components than those shown in the figure, or combine certain components, or adopt a different arrangement of components.

[0137] In an exemplary embodiment, a computer device is also provided, the computer device comprising a processor and a memory, wherein at least one computer program is stored in the memory. The at least one computer program is loaded and executed by one or more processors, so that the computer device implements any of the above-mentioned methods for acquiring acoustic wave time difference data.

[0138] In an exemplary embodiment, a computer-readable storage medium is also provided, in which at least one computer program is stored. The at least one computer program is loaded and executed by a processor of a computer device to enable the computer to implement any of the above-mentioned methods for obtaining acoustic wave time difference data.

[0139] In one possible implementation, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, etc.

[0140] In an exemplary embodiment, a computer program product or a computer program is also provided, the computer program product or the computer program includes a computer instruction, and the computer instruction is stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes any of the above-mentioned methods for acquiring acoustic wave time difference data.

[0141] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions. For example, the wellbore data involved in this application are all obtained with full authorization.

[0142] It should be understood that the "plurality" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0143] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for obtaining acoustic time difference data, characterized in that: The method comprises: Acquire wellbore data and drill bit diameter of each initial well section in at least one initial well section; Determine an initial well section where borehole diameter expansion occurs from the at least one initial well section according to the well diameter data and the drill bit diameter of each initial well section, and determine the initial well section where borehole diameter expansion occurs as the well section to be reconstructed; Obtaining lithologic volume content data of a reference well section corresponding to the well section to be reconstructed, wherein the rock type included in the reference well section is the same as the rock type included in the well section to be reconstructed, and there is no wellbore expansion in the reference well section, and the lithologic volume content data of the reference well section is used to describe the content of the rock included in the reference well section; Determining the reference coefficient of the well section to be reconstructed according to the lithology volume content data of the reference well section; The acoustic wave time difference data of the well section to be reconstructed is determined according to the lithology volume content data of the well section to be reconstructed and the reference coefficient.

2. The method according to claim 1, characterized in that Before obtaining the lithology volume content data of the reference well section corresponding to the well section to be reconstructed, the method further includes: Determine at least one reference wellbore whose distance from an initial wellbore is not greater than a reference threshold, the initial wellbore being the wellbore where the well section to be reconstructed is located; The reference well section is selected from the well section included in the initial wellbore and the well section included in the at least one reference wellbore.

3. The method according to claim 1 or 2, characterized in that: The step of determining the reference coefficient of the well section to be reconstructed according to the lithology volume content data of the reference well section comprises: Obtaining a reference relationship between the reference coefficient, the acoustic wave time difference data and the lithology volume content data; The reference coefficient is calculated based on the lithology volume content data of the reference well section, the acoustic wave time difference data of the reference well section and the reference relationship.

4. The method according to claim 3, characterized in that The reference relationship includes: AC θ (C1, C2, ..., C n , SH, por)=θ0+θ1C1+θ2C2+…+θ n C n +θ n+1 SH+θ n+2 por; Among them, the AC θ (C1, C2, ..., C n , SH, por) is the acoustic time difference data of the well section to be reconstructed, and the C1, C2, ..., C n , SH, por is the lithology volume content data of the well section to be reconstructed, and the θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, and n is the number of rock types included in the well section to be reconstructed.

5. The method according to claim 3, characterized in that: The step of calculating the reference coefficient according to the lithology volume content data of the reference well section, the acoustic time difference data of the reference well section and the reference relationship includes: The reference coefficient is obtained by calculating according to the lithology volume content data of the reference well section, the acoustic time difference data of the reference well section and the reference relationship according to the following formula; Wherein, the J(θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 ) is the θ0, θ1, θ2,..., θ n ,θ n+1 ,θ n+2 The residual values ​​of θ0, θ1, θ2, ..., θ n ,θ n+1 ,θ n+2 is the reference coefficient, n is the number of rock types included in the reference well section, and AC i is the measured value of the acoustic time difference data of the reference well section, i is the sample identifier of the reference well section, is the calculated value of the acoustic time difference data of the reference well section calculated by the reference relationship, SH i ,por i is the lithology volume content data of the reference well section, and m is the number of samples in the reference well section.

6. The method according to claim 1 or 2, characterized in that: The lithology volume content data includes at least one of rock content, mud content and porosity.

7. A device for acquiring acoustic wave time difference data, characterized in that: The device comprises: An acquisition module, used for acquiring the well diameter data and drill bit diameter of each initial well section in at least one initial well section; A determination module, configured to determine an initial well section where borehole diameter expansion occurs from the at least one initial well section according to the well diameter data and the drill bit diameter of each initial well section, and determine the initial well section where borehole diameter expansion occurs as the well section to be reconstructed; The acquisition module is further used to acquire lithology volume content data of a reference well section corresponding to the well section to be reconstructed, the rock type included in the reference well section is the same as the rock type included in the well section to be reconstructed, the reference well section does not have a borehole expansion, and the lithology volume content data of the reference well section is used to describe the content of the rock included in the reference well section; The determination module is further used to determine the reference coefficient of the well section to be reconstructed according to the lithology volume content data of the reference well section; The determination module is further used to determine the acoustic wave time difference data of the well section to be reconstructed according to the lithology volume content data of the well section to be reconstructed and the reference coefficient.

8. The device according to claim 7, characterized in that The determination module is further used to determine at least one reference wellbore whose distance from an initial wellbore is not greater than a reference threshold, the initial wellbore being the wellbore where the well section to be reconstructed is located; and to select the reference well section from the well sections included in the initial wellbore and the well sections included in the at least one reference wellbore.

9. A computer device, characterized in that: The computer device includes a processor and a memory, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by the processor so that the computer device implements the method for obtaining sound wave time difference data as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one computer program, and the at least one computer program is loaded and executed by the processor so that the computer implements the method for obtaining acoustic wave time difference data as described in any one of claims 1 to 6.

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