A method, system, device and storage medium for ultra-deep well depth correction

Abstract

This invention belongs to the field of ultra-deep well depth correction, and discloses an ultra-deep well depth correction method, system, equipment, and storage medium. The method involves dividing the drill string's entry length into the well into two segments based on measuring points, acquiring the measured depth and temperature data, and the depth and axial tension data for each measuring point. Pre-constructed thermal expansion correction models and elastic tension correction models are input to calculate the total thermal expansion and total elastic tension. Finally, the corrected well depth is output based on the drill string's entry length. This method effectively solves the problem of insufficient accuracy in traditional well depth measurement due to drill string deformation, significantly improves the depth accuracy of ultra-deep well drilling, simplifies the correction calculation process, enhances operational convenience, and provides data support for wellbore trajectory reliability assessment, avoiding the shortcomings of existing correction methods such as poor performance, complex calculations, and lack of assessment models.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ultra-deep well depth correction, and particularly relates to an ultra-deep well depth correction method, system, device and storage medium. BACKGROUND

[0002] At present, the ultra-deep well drilling technology is one of the key technical means for obtaining deep oil and gas resources and realizing efficient development of resources. With the exploration and development advancing to deeper strata, the measurement accuracy of the measurement while drilling technology, as a core technology for real-time mastering of downhole geological parameters and well trajectory, directly determines the safety of drilling operation and the efficiency of resource exploitation. As a basic link of the measurement while drilling, the well depth measurement is an important basis for subsequent well trajectory control and geological layering. At present, the industry mainly relies on the length of the downhole pipe string for well depth measurement.

[0003] However, the downhole environment of the ultra-deep well has the significant characteristics of high temperature and high tension. The drill string is prone to thermal expansion and elastic tensile deformation in this environment, resulting in a large deviation of the traditional well depth measurement method based on the length of the downhole pipe string, which cannot accurately reflect the actual well depth. At the same time, the existing correction methods for well depth error, such as the depth correction method of the markable layer and the drill string cumulative method, not only have poor correction effect that cannot meet the high-precision measurement demand of the ultra-deep well, but also have the problems of complex calculation process and poor operation convenience. Moreover, the above methods do not construct a corresponding well position uncertainty calculation model, which cannot provide data support for the reliability evaluation of the well trajectory.

[0004] Therefore, in the current ultra-deep well drilling process, the traditional well depth measurement method has insufficient precision due to the deformation of the drill string, and the existing error correction method has poor effect and complex calculation. SUMMARY

[0005] The application provides an ultra-deep well depth correction method, system, device and storage medium to solve the technical problems of insufficient precision of the traditional well depth measurement method due to the deformation of the drill string and poor effect and complex calculation of the existing error correction method in the current ultra-deep well drilling process.

[0006] In order to achieve the above purpose, the application adopts the following technical solutions:

[0007] An ultra-deep well depth correction method comprises the following steps:

[0008] The downhole modeling length of the downhole drill string is divided into two sections based on the measuring points, and the first number of sections for temperature tensile correction calculation and the second number of sections for elastic tensile correction calculation are obtained;

[0009] The measurement while drilling depth of each measuring point and the temperature of each measuring point corresponding to the first number of sections are obtained; the measurement while drilling depth of each measuring point and the axial tension of the drill string of each measuring point corresponding to the second number of sections are obtained;

[0010] inputting the measured depths of each measuring point corresponding to the first number of segments and the temperatures of each measuring point into a pre-constructed thermal expansion correction model to calculate a total thermal expansion amount; and inputting the measured depths of each measuring point corresponding to the second number of segments and the axial tension of each measuring point into a pre-constructed elastic stretching correction model to calculate a total elastic stretching amount;

[0011] based on the total thermal expansion amount, the total elastic stretching amount and the modeled length of the drilling tool into the well, calculating the depth of the ultra-deep well to achieve the correction of the depth of the ultra-deep well.

[0012] Further, after the measured depths of each measuring point corresponding to the first number of segments and the temperatures of each measuring point are obtained, the method further comprises:

[0013] According to the temperature of each measuring point, a linear interpolation method is used to obtain the temperature gradient between adjacent measuring points, and the specific formula is as follows:

[0014]

[0015] In the formula, denotes the temperature gradient between the i-th adjacent measuring points; denotes the temperature of the i-th measuring point; denotes the temperature of the i-1-th measuring point.

[0016] Further, before the measured depths of each measuring point corresponding to the second number of segments and the axial tension of each measuring point are obtained, the method comprises:

[0017] Based on the specification parameters of the drilling tool, the cross-sectional area of each measuring point is calculated, and the specific formula is as follows:

[0018]

[0019] In the formula, denotes the cross-sectional area of the j-th measuring point; denotes the outer diameter of the j-th measuring point; denotes the inner diameter of the j-th measuring point.

[0020] Further, the inputting the measured depths of each measuring point corresponding to the first number of segments and the temperatures of each measuring point into a pre-constructed thermal expansion correction model to calculate a total thermal expansion amount comprises:

[0021] The measured depths of each measuring point corresponding to the first number of segments and the temperatures of each measuring point are inputted into a pre-constructed thermal expansion correction model to calculate a total thermal expansion amount; wherein the specific expression of the thermal expansion correction model is as follows:

[0022] R1

[0023]

[0024] In the formula, represents the thermal expansion elongation of the i-th section drill pipe; represents the thermal expansion elongation of the i-th section drill pipe; represents the thermal expansion coefficient of the material of the drill pipe; represents the temperature of the measuring point of the i-th section; represents the temperature of the measuring point of the i-1-th section; represents the surface temperature; represents the measured measured depth while drilling of the measuring point of the i-th section; represents the measured measured depth while drilling of the measuring point of the i-1-th section; represents the total thermal expansion amount; i is an integer from 1 to n, n is a positive integer; R1 represents a constraint coefficient of thermal expansion correction.

[0025] Further, the measured measured depth while drilling of each measuring point corresponding to the second section number and the axial tension of the drill pipe borne by each measuring point are input into the pre-constructed elastic stretching correction model to calculate the total elastic stretching amount, comprising:

[0026] The measured measured depth while drilling of each measuring point corresponding to the second section number and the axial tension of the drill pipe borne by each measuring point are input into the pre-constructed elastic stretching correction model to calculate the total elastic stretching amount; wherein the specific expression of the elastic stretching correction model is as follows:

[0027] R2

[0028]

[0029] In the formula, represents the elastic stretching amount of the j-th section drill pipe; represents the axial tension of the drill pipe borne by the j-th measuring point; represents the axial tension of the drill pipe borne by the j-1-th measuring point; represents the measured measured depth while drilling of the measuring point of the j-th section; represents the measured measured depth while drilling of the measuring point of the j-1-th section; represents the elastic modulus of the j-th section drill pipe; represents the cross-sectional area of the j-th measuring point; represents the total elastic stretching amount; j is an integer from 1 to m, m is a positive integer; R2 represents a working condition correction coefficient of elastic stretching correction.

[0030] Further, the total thermal expansion amount, the total elastic stretching amount and the measured in-hole modeling length of the drill pipe are calculated to obtain the depth of the ultra-deep well, comprising:

[0031] The total thermal expansion amount, the total elastic stretching amount and the measured in-hole modeling length of the drill pipe are obtained;

[0032] The total thermal expansion amount, the total elastic stretching amount and the total modeling length of the drilling tool into the well are summed up to obtain the well depth of the ultra-deep well, and the specific formula is as follows:

[0033]

[0034] In the formula, The well depth of the ultra-deep well is represented by D; The total modeling length of the drilling tool into the well is represented by L; The total elastic stretching amount is represented by S; The total thermal expansion amount is represented by T.

[0035] Further, after the well depth of the ultra-deep well is corrected based on the total thermal expansion amount, the total elastic stretching amount and the total modeling length of the drilling tool into the well, the method further comprises:

[0036] Based on the relative errors of the thermal expansion coefficient, the surface temperature and the drilling tool length, the thermal expansion correction error limit is calculated by combining the measured depths of the measuring points corresponding to the first number of segments and the temperatures and the total thermal expansion amounts of the measuring points.

[0037] Based on the relative errors of the axial tension, the elastic modulus and the cross-sectional area, the elastic stretching correction error limit is calculated by combining the measured depths of the measuring points corresponding to the second number of segments and the axial tensions of the drilling tools and the total elastic stretching amounts of the measuring points.

[0038] The total thermal expansion amount is evaluated based on the thermal expansion correction error limit and a preset thermal expansion correction error threshold.

[0039] The total elastic stretching amount is evaluated based on the elastic stretching correction error limit and a preset elastic stretching correction error threshold.

[0040] An ultra-deep well depth correction system comprises:

[0041] The segmented module is configured to segment the modeling length of the drilling tool into the well into two segments based on the measuring points, and the two segments include a first number of segments for temperature stretching amount correction calculation and a second number of segments for elastic stretching amount correction calculation.

[0042] The data acquisition module is configured to acquire the measured depths of the measuring points corresponding to the first number of segments and the temperatures of the measuring points, and acquire the measured depths of the measuring points corresponding to the second number of segments and the axial tensions of the drilling tools.

[0043] The calculation module is used to input the measured well depth and temperature of each measuring point corresponding to the first segment into the pre-built thermal expansion correction model to calculate the total thermal expansion; and to input the measured well depth and axial tensile force on the drill string at each measuring point corresponding to the second segment into the pre-built elastic tension correction model to calculate the total elastic tension.

[0044] The correction module is used to calculate the depth of ultra-deep wells based on the total thermal expansion, total elastic tension, and the drilling tool's insertion length, so as to achieve the correction of the depth of ultra-deep wells.

[0045] An ultra-deep well depth correction device includes:

[0046] Memory, used to store computer programs;

[0047] A processor is used to implement the steps of the above-described ultra-deep well depth correction method when executing the computer program.

[0048] A computer-readable storage medium storing a computer program, which, when executed by a processor, is used to implement the steps of the above-described ultra-deep well depth correction method.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] This invention provides a method for correcting the depth of ultra-deep wells. The method involves dividing the drill string's entry length into the well into two segments based on measuring points. The first segment is used for temperature-induced stretching correction, and the second for elastic stretching correction. Drilling-while-go (DWGo) data on depth and temperature, as well as depth and axial tension data, are acquired at each measuring point. These data are then input into pre-constructed thermal expansion and elastic stretching correction models to calculate the total thermal expansion and total elastic stretching. Finally, the corrected depth is output based on the drill string's entry length. This method utilizes segmented models to independently analyze the thermal expansion effect caused by high temperature and the elastic stretching deformation caused by high tension. By integrating the data from each measuring point, the total deformation is accumulated, thereby accurately compensating for the comprehensive deformation error of the drill string under temperature and stress coupling conditions. This method effectively solves the problem of insufficient accuracy in traditional well depth measurement due to drill string deformation, significantly improves the depth accuracy of ultra-deep well drilling, simplifies the correction calculation process, enhances operational convenience, and provides data support for wellbore trajectory reliability assessment, avoiding the shortcomings of existing correction methods such as poor performance, complex calculations, and lack of assessment models.

[0051] Preferably, in this invention, a linear interpolation method is introduced to calculate the temperature gradient between adjacent measuring points during the temperature data acquisition stage. This method uses the average temperature of adjacent measuring points as the representative value of the temperature gradient for that segment. The calculation process is simple and efficient, and can reasonably reflect the temperature change trend within the segmented range of the drilling tool. It provides key and easily calculated temperature input parameters for the subsequent thermal expansion correction model, ensuring the accurate basis for the calculation of thermal expansion. At the same time, it conforms to the actual working conditions of limited downhole temperature measuring points, enhancing the practicality of the method.

[0052] Preferably, in this invention, before elastic tensile correction, the cross-sectional area at each measuring point is calculated based on the drill string specifications. This calculation uses standard geometric formulas to accurately determine the actual bearing area at each location based on the drill string's outer and inner diameters. This provides precise mechanical calculation parameters for the elastic tensile correction model, ensuring accurate calculation of the unit stress caused by tension, thereby significantly improving the accuracy of elastic tensile calculation and avoiding errors caused by using average cross-sections. This is particularly suitable for the complex characteristics of ultra-deep well drill string combinations.

[0053] Preferably, in this invention, the thermal expansion correction model comprehensively considers the material's thermal expansion coefficient, the calculated segmented temperature gradient, the surface reference temperature, the well depth difference at the measuring points, and a thermal expansion correction constraint coefficient. The total thermal expansion is obtained through segmented calculations and summation. This model has a clear structure and explicit physical meaning, enabling precise quantification of the drill string's thermal expansion and elongation caused by temperature differences in different well sections. The introduction of the constraint coefficient further refines the theoretical calculation results to better reflect actual working conditions, significantly improving the scientific rigor and accuracy of thermal deformation correction.

[0054] Preferably, in this invention, the elastic tension correction model uses the average tension value of adjacent measuring points, the difference in well depth between measuring points, the elastic modulus of the drill string, the cross-sectional area of ​​the measuring points, and an elastic tension working condition correction coefficient to calculate the segmented elastic tension and sum them up to obtain the total amount. This model reasonably reflects the change of tension along the well depth, simplifies the calculation by averaging the tension while maintaining accuracy, and the working condition correction coefficient is used to adapt to the complex mechanical boundary conditions in actual downhole operations, thereby quantifying the elastic elongation deformation of the drill string under axial tension with high precision.

[0055] Preferably, this invention also incorporates an error assessment mechanism. After completing well depth correction, this method further utilizes the relative error data of the input parameters and the calculated deformation to quantitatively calculate the error limits for thermal expansion correction and elastic tensile correction, respectively. By comparing these error limits with preset thresholds, the reliability of the total thermal expansion and total elastic tensile amount of the correction results can be assessed. This provides, for the first time, a quantitative assessment method for the uncertainty of ultra-deep well depth correction results, providing crucial data support for subsequent wellbore trajectory reliability analysis and risk decision-making, filling a gap in existing technologies in this area. Attached Figure Description

[0056] Figure 1 A flowchart illustrating the implementation of an ultra-deep well depth correction method provided in this embodiment of the invention;

[0057] Figure 2 A flowchart of an ultra-deep well depth correction method provided in an embodiment of the present invention;

[0058] Figure 3 This is a schematic diagram of the structure of an ultra-deep well depth correction system provided in an embodiment of the present invention. Detailed Implementation

[0059] To further understand the content of this invention, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0060] As described in the background section, traditional well depth measurement methods mainly rely on the length of the drill string. However, due to factors such as thermal expansion and elastic tension of the drill string, the measurement results deviate significantly from the actual well depth. Existing error correction methods, such as the marker layer depth correction method and the drill string accumulation method, suffer from poor correction effects and computational complexity, and do not provide corresponding calculation models for wellbore location uncertainty.

[0061] To address the aforementioned issues, this embodiment provides an ultra-deep well depth correction method. This method establishes a thermal expansion correction model and an elastic tension correction model, and combines factors such as well temperature, drill string axial force, and drill string specifications to correct the well depth measured while drilling, and calculates the uncertainty of the wellbore position, thereby improving the accuracy of well depth measurement.

[0062] like Figure 2 As shown, this embodiment provides an ultra-deep well depth correction method, including:

[0063] Based on the measuring points, the length of the drilling tool entering the well is divided into two segments: the first segment for temperature stretching correction calculation and the second segment for elastic stretching correction calculation.

[0064] Obtain the measurement-while-drilling depth and temperature of each measuring point corresponding to the first segment number; obtain the measurement-while-drilling depth and axial tensile force on the drill string at each measuring point corresponding to the second segment number;

[0065] The well depth measured while drilling and the temperature of each measuring point corresponding to the first segment are input into the pre-built thermal expansion correction model to calculate the total thermal expansion; the well depth measured while drilling and the axial tensile force borne by the drill string at each measuring point corresponding to the second segment are input into the pre-built elastic tension correction model to calculate the total elastic tension.

[0066] The depth of the ultra-deep well is calculated based on the total thermal expansion, total elastic tension, and the drilling tool's insertion length, so as to achieve the correction of the ultra-deep well depth.

[0067] The well depth correction method of this embodiment will be further explained below with reference to the specific implementation process of this example:

[0068] Step 1: Segmented Modeling and Dynamic Coupling of Parameters

[0069] S1.1, Drill string segmentation:

[0070] Based on the measuring points, the drilling tools inside the well are divided into... part( =1~ )and part( =1~ These parameters are used for thermal expansion and elastic tension calculations, respectively, with each segment independently acquiring temperature, axial tension, and drill bit specification parameters.

[0071] S1.2, Dynamic temperature distribution:

[0072] Based on drilling temperature measurement data, the temperature gradient between adjacent measuring points is obtained using linear interpolation. The average temperature of the segment is:

[0073]

[0074] In the formula, This represents the temperature gradient between adjacent measuring points in the i-th segment; This represents the temperature at the i-th measuring point; This represents the temperature at the (i-1)th measuring point.

[0075] S1.3, Coupling of mechanical parameters:

[0076] The axial tensile force at each measuring point was calculated using the tubular friction-torque model. Calculate the cross-sectional area based on the drill string specifications:

[0077]

[0078] In the formula, This represents the cross-sectional area of ​​the j-th measuring point; This represents the outer diameter of the j-th measuring point; This represents the inner diameter of the j-th measuring point.

[0079] Step 2: Thermal Expansion Correction Model

[0080] S2.1, No. Thermal expansion elongation of drill string The formula is:

[0081] R1

[0082] S2.2, Total thermal expansion :

[0083]

[0084] In the formula, Indicates the first Thermal expansion elongation of the drill string section; The coefficient of thermal expansion of the drilling tool material (°C) -1 ); Let be the temperature (°C) at the measuring point of the i-th segment. The temperature at the measuring point of the (i-1)th segment is obtained based on the pre-calculated temperature at each measuring point. Indicates the surface temperature (°C); Indicates the measurement-while-drilling depth (m) of the i-th measuring point; This represents the measurement-while-drilling depth of the (i-1)th measuring point; R1 represents the total thermal expansion; i takes values ​​from 1 to n, where n is a positive integer; R1 represents the constraint coefficient for thermal expansion correction.

[0085] R1 ranges from 0 to 1, and its physical meaning represents the degree of freedom of thermal expansion of the drill bit.

[0086] Step 3: Elastic Tension Correction Model

[0087] S3.1, No. The formula for the elastic tensile strength of a drill string section is:

[0088] R2

[0089] S3.2, Total elastic tensile force:

[0090]

[0091] In the formula, This represents the elastic tension of the j-th segment of the drill string; This represents the axial tensile force (N) borne by the drill bit at the j-th measuring point; This represents the axial tensile force (N) borne by the drill bit at the (j-1)th measuring point; This represents the measurement-while-drilling depth of the j-th measuring point; This indicates the measurement-while-drilling depth of the (j-1)th measuring point; This represents the elastic modulus (Pa) of the j-th segment of the drill string. Represents the cross-sectional area (m) of the j-th measuring point. 2 ); R2 represents the total elastic tension; j ranges from 1 to m, where m is a positive integer; R2 represents the working condition correction coefficient for elastic tension correction.

[0092] R2 ranges from 0.85 to 1.05, and its physical meaning represents the axial force purity of the drill bit under elastic tension.

[0093] Step 4: Real-time correction and uncertainty update process:

[0094] S4.1 Data Acquisition: Real-time acquisition of downhole temperature Axial tension Drill string parameters ( );

[0095] S4.2, Segmented Calculation: Thermal Expansion With elastic stretch ;

[0096] S4.3 Well Depth Correction: Corrected Well Depth + .

[0097] Step 4: Error Limit Calculation and Uncertainty Quantification

[0098] Based on the total thermal expansion, total elastic tensile strength, and the drilling string insertion modeling length, the ultra-deep well depth is calculated. After correcting for the ultra-deep well depth, the following steps are taken:

[0099] Based on the relative errors of the obtained thermal expansion coefficient, surface temperature, and drill string length, combined with the drilling depth of each measuring point corresponding to the first segment and the temperature and total thermal expansion of each measuring point, the thermal expansion correction error limit is calculated.

[0100] Based on the relative errors of axial tensile force, elastic modulus, and cross-sectional area, combined with the measured well depth at each measuring point corresponding to the second segment and the axial tensile force and total elastic tension at each measuring point, the elastic tension correction error limit is calculated.

[0101] The total thermal expansion is evaluated based on the thermal expansion correction error limit and the preset thermal expansion correction error threshold.

[0102] The total elastic stretch is evaluated based on the elastic tensile correction error limit and the preset elastic tensile correction error threshold, as shown below:

[0103] S5.1 Thermal expansion correction error limit :

[0104]

[0105] S5.2, Elastic Tensile Correction Error Limit :

[0106]

[0107] in, , , The relative errors (%) of thermal expansion coefficient, surface temperature, and drill string length are: The relative errors (%) of axial tensile force, elastic modulus, and cross-sectional area are respectively, with a value range of 3% to 5%.

[0108] The well depth correction method provided in this embodiment is applied to a practical well depth correction application scenario, and the implementation process is as follows:

[0109] Example data:

[0110] Drill string assembly:

[0111] Screw rod + non-magnetic: outer diameter 127mm, inner diameter 70mm, section length 18.53m, well depth 8182.01-8200.54m;

[0112] Drill collar: outer diameter 121mm, inner diameter 70mm, section length 27.81m, well depth 8154.02-8182.01m;

[0113] Heavy-duty drill pipe: outer diameter 89mm, inner diameter 70mm, section length 280.4m, well depth 7873.80-8154.2m;

[0114] Drill pipe (4″): outer diameter 102mm, inner diameter 85mm, section length 3002.5m, well depth 0-7873.8m;

[0115] Geothermal data:

[0116] A depth of 8000.00m corresponds to an average temperature of 175℃;

[0117] Surface temperature =25℃;

[0118] Other parameters:

[0119] coefficient of expansion =7.2×10 -6 ℃ -1 relative error =5%;

[0120] elastic modulus =200GPa, relative error =5%;

[0121] Drill string length measurement error =0.12%, outer diameter / inner diameter error =0.10%;

[0122] The j-th segment of tension =100kN, =90kN;

[0123] Calculation steps:

[0124] Step 1: Segmented Modeling and Dynamic Coupling of Parameters:

[0125] a. Drill string segmentation:

[0126] The drill string is divided into sections based on the depth of penetration. Taking the last drilling run as an example, the specific sections are shown in Table 1:

[0127] Table 1 shows the specific details of the drill string section division.

[0128]

[0129] b. Dynamic temperature distribution:

[0130] Based on the depth-interpolated temperature, taking the weighted drill pipe section (7873.80~8154.20m) as an example:

[0131] A depth of 8000m corresponds to a temperature of 175℃;

[0132] Linear interpolation formula:

[0133] =152℃;

[0134] Note: The data here represents the linear variation of the temperature gradient at a preset depth of 5000~8000m.

[0135] c. Coupling of mechanical parameters:

[0136] Calculate the cross-sectional area of ​​each drill string segment. :

[0137] Screw + non-magnetic section: ;

[0138] Drill collar section: ;

[0139] Step 2: Thermal expansion correction model:

[0140] a. Calculation of thermal expansion in a single segment:

[0141] Taking the drill collar section as an example: =27.81m, =152℃, R=1 (no constraint coefficient, substitute the value);

[0142]

[0143] 7.2×10 -6 ×(152-25)×27.81=0.026m;

[0144] b. Total thermal expansion:

[0145] Summing over all segments: ∑ .

[0146] Step 3: Elastic tensile correction model:

[0147] a. Calculation of single-segment elastic tensile capacity:

[0148] Taking the weighted drill pipe section as an example: ( =100kN, =90kN)

[0149]

[0150] Substitute the values: =0.186m;

[0151] b. Total elastic stretch: =∑ =0.186+0.132+0.075+0.0041=0.434m;

[0152] Step 4: Real-time correction and uncertainty update:

[0153] a. Corrected well depth:

[0154] + =8179.12+1.977+0.434=8181.53m;

[0155] bc Wellbore location (depth) covariance matrix: The final error was reduced by 71%.

[0156] Therefore, the corrected calculation conclusion is as follows:

[0157] Total thermal expansion correction: 1.977m, error limit 0.34m;

[0158] Total elastic tensile correction: 0.434m, error limit 1.77m;

[0159] After correction, the accuracy of well depth was significantly improved, and the error was reduced by 76.1%.

[0160] Step 5: Error Limit Calculation and Uncertainty Quantification

[0161] a. Thermal expansion correction error limit :

[0162]

[0163] Substitute parameters: =1%;

[0164] =0.34m.

[0165] b. Elastic tensile correction error limit :

[0166]

[0167] Input parameters: =0.1%;

[0168] 1.77m.

[0169] In summary, this embodiment provides a method for correcting the depth of ultra-deep wells. By coupling segmented modeling with dynamic parameters, it significantly improves the accuracy of well depth measurement and the scientific assessment capability of wellbore location uncertainty. This method effectively solves the error accumulation problem caused by simplification in traditional methods by calculating the thermal expansion and elastic tension of the drill string segmentally, combined with real-time dynamic analysis of temperature and mechanical parameters, thus significantly reducing vertical depth error. The model supports real-time changes in downhole temperature and axial tension, adapts to the continuous correction needs of complex wellbore trajectories, has high computational efficiency, and meets the requirements for real-time field processing.

[0170] like Figure 3 As shown, this embodiment also provides an ultra-deep well depth correction system, including: a segmentation module, used to divide the drilling tool's entry modeling length into the well into two segments based on measuring points, dividing it into a first segment for temperature tensile correction calculation and a second segment for elastic tensile correction calculation; a data acquisition module, used to acquire the measured well depth and temperature of each measuring point corresponding to the first segment; acquire the measured well depth and axial tensile force borne by the drilling tool at each measuring point corresponding to the second segment; a calculation module, used to input the measured well depth and temperature of each measuring point corresponding to the first segment into a pre-constructed thermal expansion correction model to calculate the total thermal expansion; input the measured well depth and axial tensile force borne by the drilling tool at each measuring point corresponding to the second segment into a pre-constructed elastic tensile correction model to calculate the total elastic tensile force; and a correction module, used to calculate the ultra-deep well depth based on the total thermal expansion, total elastic tensile force, and drilling tool entry modeling length, to achieve ultra-deep well depth correction.

[0171] The present invention also provides an apparatus comprising: a memory for storing a computer program; and a processor for executing the computer program to implement the steps of the ultra-deep well depth correction method.

[0172] When the processor executes the computer program, it implements the above-mentioned steps for ultra-deep well depth correction, for example: dividing the drilling tool's entry modeling length into the well into two segments based on the measuring points, into a first segment for temperature tensile correction calculation and a second segment for elastic tensile correction calculation; obtaining the measured depth of the well and the temperature of each measuring point corresponding to the first segment; obtaining the measured depth of the well and the axial tensile force borne by the drilling tool at each measuring point corresponding to the second segment; inputting the measured depth of the well and the temperature of each measuring point corresponding to the first segment into a pre-built thermal expansion correction model to calculate the total thermal expansion; inputting the measured depth of the well and the axial tensile force borne by the drilling tool at each measuring point corresponding to the second segment into a pre-built elastic tensile correction model to calculate the total elastic tensile force; and calculating the ultra-deep well depth based on the total thermal expansion, the total elastic tensile force, and the drilling tool's entry modeling length to achieve ultra-deep well depth correction.

[0173] Alternatively, the processor may execute the computer program to implement the functions of each module in the above system.

[0174] For example, the computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing preset functions, the instruction segments describing the execution process of the computer program in the ultra-deep well depth correction device. For example, the computer program can be divided into a segmentation module, a data acquisition module, a calculation module, and a correction module. The specific functions of each module are as follows: The segmentation module is used to divide the drilling tool's entry modeling length into the well twice based on the measuring points, into a first segment for temperature stretching correction calculation and a second segment for elastic stretching correction calculation; The data acquisition module is used to acquire the measured depth during drilling and the temperature of each measuring point corresponding to the first segment; and to acquire the measured depth during drilling and the axial tension borne by the drilling tool at each measuring point corresponding to the second segment; The calculation module is used to input the measured depth during drilling and the temperature of each measuring point corresponding to the first segment into a pre-built thermal expansion correction model to calculate the total thermal expansion; and to input the measured depth during drilling and the axial tension borne by the drilling tool at each measuring point corresponding to the second segment into a pre-built elastic stretching correction model to calculate the total elastic stretching; The correction module is used to calculate the ultra-deep well depth based on the total thermal expansion, the total elastic stretching, and the drilling tool's entry modeling length, to achieve ultra-deep well depth correction.

[0175] The ultra-deep well depth correction device can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The ultra-deep well depth correction device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that the above are examples of ultra-deep well depth correction devices and do not constitute a limitation on them. The device may include more components than described above, or combine certain components, or different components. For example, the ultra-deep well depth correction device may also include input / output devices, network access devices, buses, etc.

[0176] The processor referred to can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or any conventional processor. The processor is the control center of the ultra-deep well depth correction, connecting various parts of the ultra-deep well depth correction equipment via various interfaces and lines.

[0177] The memory can be used to store the computer program and / or modules. The processor implements various functions of the ultra-deep well depth correction device by running or executing the computer program and / or modules stored in the memory and calling the data stored in the memory.

[0178] The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function (such as sound playback, image playback, etc.). The data storage area may store data created based on the use of the mobile phone (such as audio data, phonebook, etc.). Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital cards (SD cards), flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0179] The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the ultra-deep well depth correction method described above.

[0180] If the modules / units integrated in the ultra-deep well depth correction system are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0181] Based on this understanding, the present invention can implement all or part of the processes in the above-mentioned ultra-deep well depth correction method, or it can be accomplished by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above-mentioned ultra-deep well depth correction method. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or a preset intermediate form, etc.

[0182] The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0183] It should be noted that the content contained in the computer-readable storage medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electrical carrier signals and telecommunication signals.

[0184] This invention provides a method for correcting the depth of ultra-deep wells, which has the following advantages compared with existing well depth correction methods:

[0185] This method significantly improves the accuracy of ultra-deep well depth measurement by processing the thermal expansion and elastic tensile deformation of the drill string in a segmented and parallel manner, combining the total deformation with a pre-built dedicated correction model and superimposing it onto the wellbore length. For the high-temperature, high-tension coupled environment, it achieves independent segmented modeling and collaborative correction of the two key deformations for the first time. Measurement point data drives the thermal expansion model and elastic tensile model to accurately quantify temperature-induced elongation and force-induced elongation, respectively. Simultaneously, temperature gradient interpolation, cross-sectional area calculation, and operating condition correction coefficients are introduced to ensure reliable and realistic model input. Finally, the corrected well depth is output through simple algebraic superposition. This not only overcomes the shortcomings of insufficient accuracy in traditional methods and significantly reduces computational complexity, but also innovatively constructs an error evaluation mechanism for the correction results, providing crucial support for wellbore trajectory reliability decisions. It comprehensively surpasses the limitations of existing correction methods, which suffer from poor performance, cumbersome calculations, and lack of evaluation capabilities.

[0186] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for correcting the depth of a superdeep well, characterized in that, The method comprises the steps of: segmenting the modeled length of the drilling tool into a first number of segments for temperature stretch correction calculation and a second number of segments for elastic stretch correction calculation based on the measuring points; obtaining the measured well depth of each measuring point and the temperature of each measuring point corresponding to the first number of segments, and obtaining the measured well depth of each measuring point and the axial tension of the drilling tool of each measuring point corresponding to the second number of segments; inputting the measured well depth of each measuring point and the temperature of each measuring point corresponding to the first number of segments into a pre-constructed thermal expansion correction model to calculate the total thermal expansion amount; inputting the measured well depth of each measuring point and the axial tension of the drilling tool of each measuring point corresponding to the second number of segments into a pre-constructed elastic stretch correction model to calculate the total elastic stretch amount; calculating the depth of the ultra-deep well based on the total thermal expansion amount, the total elastic stretch amount and the modeled length of the drilling tool, so as to correct the depth of the ultra-deep well; wherein the specific expression of the thermal expansion correction model is as follows: R1 In the formula, represents the thermal expansion elongation of the i-th section of the drill string; represents the thermal expansion elongation of the i-th section of the drill string; represents the thermal expansion coefficient of the material of the drill string; represents the temperature of the measuring point of the i-th section; represents the temperature of the measuring point of the i-1-th section; represents the surface temperature; represents the measured depth of the measuring point of the i-th section; represents the measured depth of the measuring point of the i-1-th section; represents the total thermal expansion amount; i is an integer from 1 to n, n is a positive integer; R1 represents the constraint coefficient of the thermal expansion correction; the step of inputting the measured well depth of each measuring point and the axial tension of the drilling tool of each measuring point corresponding to the second number of segments into a pre-constructed elastic stretch correction model to calculate the total elastic stretch amount comprises: wherein the specific expression of the elastic stretch correction model is as follows: R2 In the formula, represents the elastic stretch of the jth section of the drill string; represents the axial tension borne by the drill string at the jth measuring point; represents the axial tension borne by the drill string at the j-1th measuring point; represents the measured depth while drilling of the jth section of the measuring point; represents the measured depth while drilling of the j-1th section of the measuring point; represents the elastic modulus of the jth section of the drill string; represents the cross-sectional area of the jth measuring point; represents the total elastic stretch; j is an integer from 1 to m, m is a positive integer; R2 represents the working condition correction coefficient of the elastic stretch correction.

2. The method according to claim 1, wherein, after the step of obtaining the measured well depth of each measuring point and the temperature of each measuring point corresponding to the first number of segments, the method further comprises the step of: obtaining the temperature gradient between adjacent measuring points by using a linear interpolation method according to the temperature of each measuring point, and the specific formula is as follows: wherein represents the temperature gradient between the i-th segment and the adjacent measuring point.

3. The method according to claim 1, wherein, before the step of obtaining the measured well depth of each measuring point and the axial tension of the drilling tool of each measuring point corresponding to the second number of segments, the method comprises the step of: calculating the cross-sectional area of each measuring point based on the specification parameters of the drilling tool, and the specific formula is as follows: wherein Aji represents the cross-sectional area of the jth measurement point; Dji represents the outer diameter of the jth measurement point; Rji represents the inner diameter of the jth measurement point.

4. The method of claim 1, wherein, the step of calculating the depth of the ultra-deep well based on the total thermal expansion amount, the total elastic stretch amount and the modeled length of the drilling tool comprises: obtaining the calculated total thermal expansion amount, the total elastic stretch amount and the measured modeled length of the drilling tool; calculating the sum of the total thermal expansion amount, the total elastic stretch amount and the modeled length of the drilling tool to obtain the depth of the ultra-deep well, and the specific formula is as follows: wherein represents the well depth of an ultra-deep well; represents the in-hole modeling length of the drilling tool; represents the total elastic stretch amount; represents the total thermal expansion amount.

5. The method of claim 1, wherein, after the step of calculating the depth of the ultra-deep well based on the total thermal expansion amount, the total elastic stretch amount and the modeled length of the drilling tool to correct the depth of the ultra-deep well, the method further comprises the steps of: calculating the thermal expansion correction error limit based on the relative error of the thermal expansion coefficient, the relative error of the surface temperature and the relative error of the drilling tool length, and combining the measured well depth of each measuring point and the temperature of each measuring point corresponding to the first number of segments and the total thermal expansion amount; calculating the elastic stretch correction error limit based on the relative error of the axial tension, the relative error of the elastic modulus and the relative error of the cross-sectional area, and combining the measured well depth of each measuring point and the axial tension of the drilling tool of each measuring point corresponding to the second number of segments and the total elastic stretch amount; evaluating the total thermal expansion amount based on the thermal expansion correction error limit and a preset thermal expansion correction error threshold; evaluating the total elastic stretch amount based on the elastic stretch correction error limit and a preset elastic stretch correction error threshold.

6. A system for implementing the steps of the method of any one of claims 1-5 for correcting the depth of a superdeep well, characterized by, ​ The segmented module is used for segmenting the modeled length of the downhole drilling tool into two segments respectively based on the measuring points, the first number of segments for temperature stretch correction calculation and the second number of segments for elastic stretch correction calculation; The data acquisition module is used for acquiring the measured depth of each measuring point and the temperature of each measuring point corresponding to the first number of segments; The second number of segments corresponding to the measured depth of each measuring point and the axial tension of the drilling tool borne by each measuring point are acquired; The calculation module is used for inputting the measured depth of each measuring point and the temperature of each measuring point corresponding to the first number of segments into the pre-constructed thermal expansion correction model to calculate the total thermal expansion amount; and inputting the measured depth of each measuring point and the axial tension of the drilling tool borne by each measuring point corresponding to the second number of segments into the pre-constructed elastic stretch correction model to calculate the total elastic stretch amount; The correction module is used for calculating the ultra-deep well depth based on the total thermal expansion amount, the total elastic stretch amount and the modeled length of the downhole drilling tool to realize the correction of the ultra-deep well depth.

7. An ultra-deep well depth correction apparatus, characterized by, It comprises: a memory for storing a computer program; a processor for executing the computer program to realize the steps of the ultra-deep well depth correction method according to any one of claims 1-5.

8. A computer-readable storage medium storing a computer program, the computer-readable storage medium comprising: The computer program is executed by the processor to realize the steps of the ultra-deep well depth correction method according to any one of claims 1-5.

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