Downhole drilling tool state identification method, device, equipment and medium

Abstract

The invention discloses a low-frequency model building method and device, equipment and a medium, and relates to the field of seismic data inversion and reservoir prediction, and the method comprises the steps: obtaining underground near-bit engineering parameters, carrying out the motion characteristic analysis and excitation characteristic analysis of the underground near-bit engineering parameters, and obtaining the motion characteristics of a shaft bottom drilling tool and the excitation characteristics of bit pressure and torque; establishing an initial drill bit-drill string system dynamic control equation by using the motion characteristics of the well bottom drilling tool and the bit pressure torque excitation characteristics, and performing parameter correction and supplementation on the initial drill bit-drill string system dynamic control equation to obtain a target drill bit-drill string system dynamic control equation; and solving the dynamic control equation of the target drill bit-drill string system to obtain a dynamic response value, and identifying and analyzing the motion state of the underground drilling tool based on the dynamic response value. According to the method, the accuracy of state recognition of the underground drilling tool can be improved, so that the profit level of a long horizontal section shale gas drilling single well is improved, the well building period is shortened, and the drilling cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of long horizontal section shale gas complex formation drilling, and in particular to a method, device, equipment and medium for identifying the state of a downhole drilling tool. Background Art

[0002] With the continuous deepening of oil exploration and development, the underground geological structure is becoming more and more complex, and there are more and more special and complex wells such as deep wells, large displacement wells, and long horizontal wells. The working environment of the underground drill string / drill bit is more severe, which will lead to premature failure of the drill bit, frequent fatigue damage of the drill tool, and damage to the underground equipment. At the same time, it limits the effective transmission of drilling pressure, which in turn affects the drilling time and the final economic benefits. At present, the traditional analysis method of the motion state of downhole drill tools only relies on expert experience and ground logging data. For the drilling of long horizontal sections of shale gas complex formations, the ground logging data can no longer truly reflect the actual characteristics of the underground, and the existing drilling tool motion state judgment scheme can no longer meet the current drilling needs of long horizontal sections of shale gas complex formations.

[0003] As can be seen from the above, how to improve the accuracy of downhole drilling tool status identification, thereby improving the profitability of single wells in long horizontal shale gas drilling, reducing the well construction cycle, and reducing drilling costs is a problem to be solved in this field. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method, device, equipment and medium for identifying the status of downhole drilling tools, which can improve the accuracy of downhole drilling tool status identification, thereby improving the profitability of long horizontal section shale gas drilling single well, reducing the well construction cycle, and reducing drilling costs. The specific scheme is as follows:

[0005] In a first aspect, the present application discloses a method for identifying a state of a downhole drilling tool, comprising:

[0006] Acquire downhole near-drill-bit engineering parameters, and respectively perform motion characteristic analysis and excitation characteristic analysis on the downhole near-drill-bit engineering parameters to obtain bottom hole drilling tool motion characteristics and drilling pressure torque excitation characteristics;

[0007] Establishing an initial drill bit-drill string system dynamics control equation using the bottom hole drilling tool motion characteristics and the bit pressure torque excitation characteristics, and performing parameter correction and supplementation on the initial drill bit-drill string system dynamics control equation to obtain a target drill bit-drill string system dynamics control equation;

[0008] The target drill bit-drill string system dynamics control equation is solved to obtain a dynamic response value, and the motion state identification and analysis of the downhole drilling tool is realized based on the dynamic response value.

[0009] Optionally, the performing motion characteristic analysis and excitation characteristic analysis on the downhole near-drill-bit engineering parameters respectively to obtain the motion characteristic of the bottom hole drilling tool and the excitation characteristic of the drilling pressure torque includes:

[0010] Using Fourier transform method to analyze the motion characteristics of the bottom hole drilling tool on the downhole near-drill bit engineering parameters to obtain the motion characteristics of the bottom hole drilling tool;

[0011] The wavelet analysis method is used to analyze the drilling pressure torque excitation characteristics of the downhole near-drill bit engineering parameters to obtain the drilling pressure torque excitation characteristics.

[0012] Optionally, the use of the bottom hole drilling tool motion characteristics and the bit pressure torque excitation characteristics to establish an initial drill bit-drill string system dynamic control equation includes:

[0013] Calculating the beam unit kinetic energy, beam unit potential energy, and unit and system stiffness damping force using the bottom hole drilling tool motion characteristics and the drilling pressure torque excitation characteristics;

[0014] A system stiffness Lagrangian equation is established, and the beam unit kinetic energy, the beam unit potential energy, and the unit and system stiffness damping force are substituted into the system stiffness Lagrangian equation to obtain the initial drill bit-drill string system dynamics control equation.

[0015] Optionally, solving the target drill bit-drill string system dynamics control equation to obtain a dynamic response value includes:

[0016] Determine a trial matrix whose matrix type is orthogonal, and use the trial matrix as a basis vector;

[0017] The Ritz method is used and the base vector is substituted into the target drill bit-drill string system dynamic control equation for simplification to obtain a simplified equation, and the simplified equation is solved by the generalized Jacobi method to obtain a dynamic response value.

[0018] Optionally, the Ritz method is used and the base vector is substituted into the target drill bit-drill string system dynamic control equation for simplification to obtain a simplified equation, including:

[0019] Using a modal transformation method, substituting the basis vector into the target drill bit-drill string system dynamics control equation, so as to transform the target drill bit-drill string system dynamics control equation from a physical space to a modal space, and obtain a simplified equation;

[0020] Alternatively, the array superposition method or the direct integration method is used and the basis vector is substituted into the target drill bit-drill string system dynamics control equation so as to transform the target drill bit-drill string system dynamics control equation into a one-dimensional non-coupled differential equation to obtain the simplified equation.

[0021] Optionally, the adopting of the generalized Jacobi method to solve the simplified equation to obtain a dynamic response value includes:

[0022] Discretize the simplified equation in the time domain to obtain the discretized equation;

[0023] The downhole near-drill-bit engineering parameters are substituted into the discretized equations by the Newmark method to obtain the dynamic response values.

[0024] Optionally, the identifying and analyzing the motion state of the downhole drilling tool based on the dynamic response value includes:

[0025] Based on the dynamic response value, the drill bit type vibration characteristic analysis, the drilling pressure torque excitation characteristic analysis and the drilling state conversion analysis of the downhole drilling tool are realized; wherein, the drill bit type vibration characteristic analysis includes the roller cone drill bit-drill string vibration characteristic analysis and the polycrystalline diamond composite drill bit-drill string vibration characteristic analysis.

[0026] In a second aspect, the present application discloses a downhole drilling tool state identification device, comprising:

[0027] A feature analysis module is used to obtain downhole near-drill-bit engineering parameters, and to perform motion feature analysis and excitation feature analysis on the downhole near-drill-bit engineering parameters to obtain bottom hole drilling tool motion features and drilling pressure torque excitation features;

[0028] A dynamic control equation establishment module is used to establish an initial drill bit-drill string system dynamic control equation by using the bottom hole drilling tool motion characteristics and the bit pressure torque excitation characteristics, and to perform parameter correction and supplement on the initial drill bit-drill string system dynamic control equation to obtain a target drill bit-drill string system dynamic control equation;

[0029] The motion state identification and analysis module is used to solve the dynamic control equation of the target drill bit-drill string system to obtain a dynamic response value, and realize the motion state identification and analysis of the downhole drilling tool based on the dynamic response value.

[0030] In a third aspect, the present application discloses an electronic device, comprising:

[0031] Memory, used to store computer programs;

[0032] The processor is used to execute the computer program to implement the aforementioned method for identifying the state of a downhole drilling tool.

[0033] In a fourth aspect, the present application discloses a computer storage medium for storing a computer program; wherein, when the computer program is executed by a processor, the steps of the aforementioned disclosed method for identifying the state of a downhole drilling tool are implemented.

[0034] It can be seen that the present application provides a method for identifying the state of a downhole drilling tool, including obtaining downhole near-drill bit engineering parameters, performing motion characteristic analysis and excitation characteristic analysis on the downhole near-drill bit engineering parameters respectively to obtain the motion characteristics of the bottom hole drill tool and the drilling pressure torque excitation characteristics; using the bottom hole drill tool motion characteristics and the drilling pressure torque excitation characteristics to establish an initial drill bit-drill string system dynamics control equation, performing parameter correction and supplementation on the initial drill bit-drill string system dynamics control equation to obtain a target drill bit-drill string system dynamics control equation; solving the target drill bit-drill string system dynamics control equation to obtain a dynamic response value, and realizing the motion state identification analysis of the downhole drilling tool based on the dynamic response value. The present application obtains accurately measured downhole near-drill bit engineering parameters, and based on the downhole near-drill bit engineering parameters, can analyze the motion characteristics of the bottom hole drill tool and the drilling pressure torque excitation characteristics to construct the drill bit-drill string system dynamic control equation, thereby improving the accuracy of downhole drilling tool state identification, and solving the drill bit-drill string system dynamic control equation to achieve motion state identification and analysis of the downhole drilling tool, which can improve the profitability of single wells in long horizontal shale gas drilling, reduce the well construction cycle, and reduce drilling costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0036] Figure 1 A flow chart of a method for identifying a downhole drilling tool state disclosed in the present application;

[0037] Figure 2 A downhole near-drill-bit engineering parameter measurement curve diagram disclosed in this application;

[0038] Figure 3 A specific solution flow chart of the Newmark method disclosed in this application;

[0039] Figure 4 A dynamic response law diagram of a drill bit-drill string system disclosed in this application;

[0040] Figure 5 A flow chart of a method for identifying a downhole drilling tool state disclosed in the present application;

[0041] Figure 6 This is a characteristic analysis diagram of downhole near-drill-bit high-frequency measurement engineering parameters disclosed in this application;

[0042] Figure 7 This is a downhole vibration measurement diagram of a roller drill bit disclosed in this application;

[0043] Figure 8 This is a measured downhole vibration diagram of a polycrystalline diamond composite drill bit disclosed in this application;

[0044] Fig. 9 A spectrum diagram of bottom hole drilling pressure torque during a composite drilling process disclosed in the present application;

[0045] Fig.10 A spectrum diagram of bottom hole drilling pressure torque during a sliding drilling process disclosed in the present application;

[0046] Fig.11 A downhole working condition identification diagram disclosed in this application;

[0047] Fig.12 This is a schematic diagram of the structure of a downhole drilling tool device disclosed in this application;

[0048] Fig.13 A structural diagram of an electronic device provided for this application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] With the continuous deepening of oil exploration and development, the underground geological structure is becoming more and more complex, and there are more and more special and complex wells such as deep wells, large displacement wells, and long horizontal wells. The working environment of the underground drill string / drill bit is more severe, which will lead to premature failure of the drill bit, frequent fatigue damage of the drill tool, and damage to the underground equipment. At the same time, it limits the effective transmission of drilling pressure, which in turn affects the drilling time and the final economic benefits. At present, the traditional method of analyzing the motion state of downhole drilling tools only relies on expert experience and ground logging data. For the drilling of long horizontal sections of shale gas complex formations, the ground logging data can no longer truly reflect the actual characteristics of the well, and the existing drilling tool motion state judgment scheme can no longer meet the current drilling needs of long horizontal sections of shale gas complex formations. As can be seen from the above, how to improve the accuracy of downhole drilling tool status recognition, thereby improving the profitability of single wells in long horizontal sections of shale gas drilling, reducing the well construction cycle, and reducing drilling costs is a problem to be solved in this field.

[0051] See also Figure 1As shown, the embodiment of the present invention discloses a method for identifying the state of a downhole drilling tool, which may specifically include:

[0052] Step S11: acquiring downhole near-drill-bit engineering parameters, and performing motion characteristic analysis and excitation characteristic analysis on the downhole near-drill-bit engineering parameters to obtain bottom hole drilling tool motion characteristics and drilling pressure torque excitation characteristics.

[0053] In this embodiment, a self-developed near-drill-bit engineering parameter measurement tool is used to obtain downhole near-drill-bit engineering parameters. The near-drill-bit engineering parameter measurement tool overcomes key technical difficulties such as the acquisition of micro-strain variables of large-size tools and the storage of large-capacity data in a high-temperature downhole environment. It innovatively adopts an integrated strain gauge scheme and is a downhole storage-type engineering parameter measurement instrument. The instrument can accurately measure, collect and store downhole drilling pressure, torque, vibration, pipe pressure, annulus pressure, temperature and other engineering parameters, and has the characteristics of high collection frequency, large storage capacity and high safety factor. The tool was used to collect the downhole near-drill-bit engineering parameter measurement curve of a shale gas well, as shown below: Figure 2 As shown, the downhole near-bit engineering parameters determined based on the downhole near-bit engineering parameter measurement curve are obtained, and the downhole near-bit engineering parameters include but are not limited to the drilling pressure torque at the downhole near-bit position, the pressure and temperature inside and outside the wellbore, and the axial and radial vibrations of the drill string. Then, the motion characteristic analysis and the excitation characteristic analysis are performed on the downhole near-bit engineering parameters respectively to obtain the bottom hole drill tool motion characteristics and the drilling pressure torque excitation characteristics.

[0054] Step S12: using the bottom hole drilling tool motion characteristics and the drilling pressure torque excitation characteristics to establish an initial drill bit-drill string system dynamics control equation, and performing parameter correction and supplementation on the initial drill bit-drill string system dynamics control equation to obtain a target drill bit-drill string system dynamics control equation.

[0055] In this embodiment, the main methods used for the current study of drill string dynamics include two methods: differential equation method and finite element method. The two methods have their own characteristics: the differential equation method has a simple model and fast calculation speed, but there are too many assumptions and serious model simplification problems, so it is mostly used for regularity research; the finite element method can consider complex influencing factors, and the model's description of the actual situation is relatively more accurate. With the development of computer technology and the advancement of numerical simulation technology, its model solution speed is also accelerating. Based on the summary of existing models, this application introduces the latest research results at home and abroad, comprehensively considers drilling fluid, actual drilling borehole trajectory, PDC (Polycrystalline Diamond Compact) drill bit rock breaking and other factors, establishes an initial drill bit-drill string system dynamics finite element model (i.e., initial drill bit-drill string system dynamics control equation), corrects and supplements the simplified and unconsidered parameters in the initial drill bit-drill string system dynamics finite element model, so that the model can achieve a more accurate description of the motion form of the drill bit-drill string system, and obtains the target drill bit-drill string system dynamics finite element model (i.e., target drill bit-drill string system dynamics control equation).

[0056] Step S13: solving the target drill bit-drill string system dynamics control equation to obtain a dynamic response value, and realizing motion state recognition and analysis of the downhole drilling tool based on the dynamic response value.

[0057] In this embodiment, a trial matrix with an orthogonal matrix type is determined, and the trial matrix is ​​used as a basis vector; the Ritz method is used and the basis vector is substituted into the target drill bit-drill string system dynamic control equation for simplification to obtain a simplified equation, and the simplified equation is solved by the generalized Jacobi method to obtain a dynamic response value. Specifically, the drill string dynamic control equation is solved by the finite element method, and the equation needs to be discretized in time and space. The solution speed in the frequency domain is fast and the solution method is relatively mature. The present invention adopts the Ritz method, and its basic steps are as follows: (1) Select a trial matrix as the basis vector of the inherent formation, and the trial matrix must be orthogonal; (2) Substitute the trial matrix into the simplified dynamic equation. In the frequency domain solution, the dynamic equation no longer considers the damping term and the external force term, and uses the generalized Jacobi method to sum; (3) Solve the natural frequency and the natural formation to obtain the dynamic response value.

[0058] The specific simplification process is: using the modal transformation method and substituting the base vector into the target drill bit-drill string system dynamics control equation, so as to transform the target drill bit-drill string system dynamics control equation from physical space to modal space, and obtain the simplified equation; or, using the array superposition method or the direct integration method and substituting the base vector into the target drill bit-drill string system dynamics control equation, so as to transform the target drill bit-drill string system dynamics control equation into a one-dimensional non-coupled differential equation, and obtain the simplified equation. There are two main methods for solving dynamic response problems in the time domain: modal transformation and direct integration: the modal transformation method is to transform the target drill bit-drill string system dynamics control equation from physical space to modal space before solving, so as to achieve price reduction and simplify equation calculation. Among them, the commonly used formation superposition method is to use the formation matrix of undamped free vibration as the transformation matrix, so as to transform the target drill bit-drill string system dynamic control equation into a set of uncoupled differential equations, and solve them one by one, and superimpose these results to obtain the solution of the system dynamic equation. The formation superposition method must first perform formation analysis; the direct integration method is also called the step-by-step integration method, which directly performs numerical integration to obtain the simplified equation.

[0059] The specific solution process is: discretize the simplified equation in the time domain to obtain the discretized equation; use the Newmark method to substitute the downhole near-drill bit engineering parameters into the discretized equation for solution to obtain the dynamic response value. Discretize the simplified equation in the time domain, and then use the Newmark method to linearly combine the acceleration and velocity at that moment into the displacements at adjacent moments. Use the Newmark method to solve the simplified equation. The Newmark method has a clear meaning for the time domain discretization of the dynamic equation. The choice of step size can be determined according to the requirements of calculation accuracy. The algorithm itself has a fast calculation speed. The solution algorithm steps are as follows: Figure 3 As shown: the displacement vector of the simplified equation that should be satisfied at any time t is replaced by a simplified equation that is satisfied at discrete points in time, and a certain assumption is made on the relationship between displacement, velocity and acceleration within a time interval. Different assumptions are taken, and there are different step-by-step integration methods, such as the central difference method, Houbolt method, linear acceleration method and Newmark method. According to the characteristics of the system model, considering factors such as the calculation speed of the algorithm and the damping of the algorithm, this application uses Newmark to solve the simplified equation.

[0060] In this embodiment, the bit type vibration characteristic analysis, drilling pressure torque excitation characteristic analysis and drilling state conversion analysis of the downhole drilling tool are realized based on the dynamic response value; wherein, the bit type vibration characteristic analysis includes roller cone bit-drill string vibration characteristic analysis and polycrystalline diamond composite bit-drill string vibration characteristic analysis. This application can obtain the dynamic response law of the drill bit-drill string system based on the motion state recognition analysis of the downhole drilling tool. The specific dynamic response law of the drill bit-drill string system is as follows: Figure 4 shown.

[0061] In this embodiment, downhole near-drill bit engineering parameters are obtained, and motion characteristic analysis and excitation characteristic analysis are performed on the downhole near-drill bit engineering parameters respectively to obtain bottom hole drill tool motion characteristics and drilling pressure torque excitation characteristics; the bottom hole drill tool motion characteristics and the drilling pressure torque excitation characteristics are used to establish an initial drill bit-drill string system dynamics control equation, and the initial drill bit-drill string system dynamics control equation is corrected and supplemented with parameters to obtain a target drill bit-drill string system dynamics control equation; the target drill bit-drill string system dynamics control equation is solved to obtain a dynamic response value, and the motion state recognition and analysis of the downhole drilling tool is realized based on the dynamic response value. The present application obtains accurately measured downhole near-drill bit engineering parameters, and based on the downhole near-drill bit engineering parameters, can analyze the motion characteristics of the bottom hole drill tool and the drilling pressure torque excitation characteristics to construct the drill bit-drill string system dynamic control equation, thereby improving the accuracy of downhole drilling tool state identification, and solving the drill bit-drill string system dynamic control equation to achieve motion state identification and analysis of the downhole drilling tool, which can improve the profitability of single wells in long horizontal shale gas drilling, reduce the well construction cycle, and reduce drilling costs.

[0062] See also Figure 5 As shown, the embodiment of the present invention discloses a method for identifying the state of a downhole drilling tool, which may specifically include:

[0063] Step S21: Acquire downhole near-drill bit engineering parameters, use Fourier transform method to analyze the downhole drill tool motion characteristics of the downhole near-drill bit engineering parameters to obtain the downhole drill tool motion characteristics, and use wavelet analysis method to analyze the drilling pressure torque excitation characteristics of the downhole near-drill bit engineering parameters to obtain the drilling pressure torque excitation characteristics.

[0064] In this embodiment, analyzing the amplitude change of the vibration signal can directly reflect the intensity of the drilling tool vibration. The downhole vibration as a whole shows a periodic change pattern. The vibration change is caused by multiple factors such as the interaction between the drill bit and the formation and the movement of the drill string itself. Therefore, by calculating the spectral characteristic of the vibration signal, the relationship between the spectral distribution of the vibration energy and the working conditions and formations can be clearly observed. The spectrum is an important feature of the signal in the frequency domain. It reflects the frequency components and distribution of the signal. The theoretical basis is the Fourier transform of the signal, which decomposes the vibration signal into a superposition of a series of sine waves of different frequencies. The mathematical expression of the Fourier transform is as follows:

[0065] X(ω)=∫x(t)e -i2πft dt;

[0066] Among them, x(t) is the time domain signal; X(ω) is the frequency domain amplitude signal after the change; f is the frequency. Fourier transform has the disadvantages of large amount of calculation and high storage space requirements, so FFT (Fast Fourier Transform) was proposed. The FFT algorithm is an improvement on the Fourier transform algorithm, and the calculation speed is significantly improved. Based on FFT analysis, previous researchers have also proposed wavelet analysis, which decomposes the signal into a superposition of a series of wavelet functions, and these wavelet functions are obtained by translation and scaling of a mother wavelet function. The wavelet analysis method has the property of adaptive window. Its definition is:

[0067]

[0068] Among them, WT(b,c) is the transformed frequency domain amplitude signal; x(t) is the time domain signal; b and c are the scale parameter and displacement parameter respectively.

[0069] The Fourier transform method is used to analyze the motion characteristics of the bottom hole drill tool, and the wavelet analysis method is used to analyze the drilling pressure torque excitation characteristics. Finally, the downhole near-drill bit high-frequency measurement engineering parameter characteristic analysis diagram including the bottom hole drill tool motion characteristics and the drilling pressure torque excitation characteristics is obtained, such as Figure 6 shown.

[0070] Step S22: Utilizing the bottom hole drilling tool motion characteristics and the drilling pressure torque excitation characteristics, the beam unit kinetic energy, the beam unit potential energy, and the unit and system stiffness damping force are calculated to establish the system stiffness Lagrangian equation, and the beam unit kinetic energy, the beam unit potential energy, and the unit and system stiffness damping force are substituted into the system stiffness Lagrangian equation to obtain the initial drill bit-drill string system dynamics control equation, and the initial drill bit-drill string system dynamics control equation is parameterized and supplemented to obtain the target drill bit-drill string system dynamics control equation.

[0071] In this embodiment, the drill string is discretized into a spatial straight beam unit along the axis of the drill string. The discretized spatial straight beam unit has bending, torsion, tensile stiffness, and compressive stiffness. The kinetic energy of the beam unit can be calculated according to the node displacement of the beam unit:

[0072]

[0073] Potential energy of beam element:

[0074]

[0075] Element and system stiffness and damping forces:

[0076]

[0077]

[0078] Establish the system stiffness Lagrange equation:

[0079]

[0080] By bringing kinetic energy, potential energy and damping force into the Lagrange equation, we can obtain the dynamic control equation of the drill bit-drill string system:

[0081]

[0082] in, {U}, {F} are generalized acceleration, velocity, displacement and external force vector, respectively. [M], [C], [K] are mass matrix, damping matrix and stiffness matrix, respectively.

[0083] Step S23: solving the target drill bit-drill string system dynamics control equation to obtain a dynamic response value, and realizing motion state recognition and analysis of the downhole drilling tool based on the dynamic response value.

[0084] In this embodiment, the motion state recognition analysis includes: (1) vibration characteristic analysis of the roller cone drill bit-drill string and the PDC drill bit-drill string of the downhole drilling tool.

[0085] The actual measurement and analysis of the vibration of the roller bit when drilling downhole Figure 7 As shown, Figure 7The measured vibration and rotation speed data of the roller bit sliding drilling downhole are listed in the figure. It can be found from the figure that the three-axis acceleration signals all have synchronous periodicity. The lateral vibration components X and Z values ​​fluctuate violently with 0 as the baseline, while the axial vibration Z fluctuates up and down with -1g as the center (along the axial direction of the drill string), reflecting the gravity acceleration characteristics of the vertical well. When the vibration is severe, the axial vibration peak is about 3.5g, which mainly reflects that the center position of the roller is constantly changing during the rolling process, resulting in axial up and down reciprocating impact on the rock; the lateral vibration components X and Z peak values ​​exceed 10g. The large lateral vibration peak value is caused by the lateral deviation caused by the meshing impact of the stator and rotor of the screw drill and the axial vibration of the roller bit. When the vibration is small, the lateral vibration fluctuates around 0g, with a peak value of about 1g. At this time, the drill string is in a weak vibration state and the drill string rotation speed is significantly reduced. It can be seen that the downhole vibration reflects the periodic characteristics of "strong vibration-weak vibration-strong vibration-weak vibration", which is a typical stick-slip vibration. PDC drill bit-drill string vibration characteristic analysis is as follows Figure 8 As shown, Figure 8 The measured vibration data of the PDC bit sliding drilling underground are listed. From the figure, it can be found that the lateral vibration X and Z acceleration signals have synchronous periodicity, and the lateral vibration components fluctuate violently around 0 as the baseline, with the peak value exceeding 15g. Figure 8 It can be seen that in sliding drilling, since the drill bit above the screw is in a stationary state, the lateral vibration and axial vibration are mainly caused by the meshing of the stator and rotor of the screw drill bit. The axial vibration Z fluctuates up and down (along the axial direction of the drill string) with -1g as the center, reflecting the gravity acceleration characteristics of the vertical well. When the vibration is severe, the Z-axis peak is about 1g, which reflects that the lateral vibration of the drill string in the narrow wellbore is large and the axial vibration level is weak. This is related to the working principle of the PDC drill bit. The PDC drill bit mainly breaks rocks by cutting, and its axial vibration is relatively small.

[0086] (2) Analysis of drilling pressure torque excitation characteristics: Spectral transformation of drilling pressure torque signal can effectively identify compound drilling and sliding drilling. During compound drilling, the drill bit is driven by the screw rotor and the rotary table / top drive to rotate and break the rock. The main frequencies of the first two amplitudes extracted from the spectrum of drilling pressure torque are 0.7 and 1.4 Hz, respectively, of which 0.7 Hz is the frequency of the screw stator rotating with the upper drill string, and 1.4 Hz is the rotation frequency of the screw rotor. The spectrum of drilling pressure torque at the bottom of the hole during compound drilling is as follows: Fig. 9 During the sliding drilling process, the upper drill bit of the screw is stationary, and the screw rotor is driven by the drilling fluid to rotate, driving the drill bit to rotate and cut the formation rock. At this time, there is only one amplitude in the drilling pressure torque spectrum diagram, the main frequency is 2Hz, corresponding to the screw speed of 120r / min. The bottom hole drilling pressure torque spectrum during sliding drilling is as follows Fig.10By checking the daily drilling report and logging data in the same time period, the downhole working conditions identified based on the drilling pressure torque signal are consistent with the actual conditions.

[0087] (3) Drilling state transition analysis: Based on the drilling pressure (or torque) measurement data, different bottom hole working conditions can be determined, including: directional, compound, reaming cycle, single root connection, etc. Downhole working condition identification based on downhole near-bit engineering parameters such as Fig.11 Taking Well 201H-XX as an example, the drilling pressure data was analyzed, and the daily drilling report and logging data in the same time period were consulted. The downhole working conditions identified based on the drilling pressure signal were consistent with the actual conditions.

[0088] In this embodiment, downhole near-drill bit engineering parameters are obtained, and motion characteristic analysis and excitation characteristic analysis are performed on the downhole near-drill bit engineering parameters respectively to obtain bottom hole drill tool motion characteristics and drilling pressure torque excitation characteristics; the bottom hole drill tool motion characteristics and the drilling pressure torque excitation characteristics are used to establish an initial drill bit-drill string system dynamics control equation, and the initial drill bit-drill string system dynamics control equation is corrected and supplemented with parameters to obtain a target drill bit-drill string system dynamics control equation; the target drill bit-drill string system dynamics control equation is solved to obtain a dynamic response value, and the motion state recognition and analysis of the downhole drilling tool is realized based on the dynamic response value. The present application obtains accurately measured downhole near-drill bit engineering parameters, and based on the downhole near-drill bit engineering parameters, can analyze the motion characteristics of the bottom hole drill tool and the drilling pressure torque excitation characteristics to construct the drill bit-drill string system dynamic control equation, thereby improving the accuracy of downhole drilling tool state identification, and solving the drill bit-drill string system dynamic control equation to achieve motion state identification and analysis of the downhole drilling tool, which can improve the profitability of single wells in long horizontal shale gas drilling, reduce the well construction cycle, and reduce drilling costs.

[0089] See also Fig.12 As shown, the embodiment of the present invention discloses a downhole drilling tool device, which may specifically include:

[0090] The characteristic analysis module 11 is used to obtain downhole near-drill-bit engineering parameters, and respectively perform motion characteristic analysis and excitation characteristic analysis on the downhole near-drill-bit engineering parameters to obtain the motion characteristics of the bottom hole drilling tool and the excitation characteristics of the drilling pressure torque;

[0091] A dynamic control equation establishment module 12 is used to establish an initial drill bit-drill string system dynamic control equation by using the bottom hole drilling tool motion characteristics and the bit pressure torque excitation characteristics, and to perform parameter correction and supplement on the initial drill bit-drill string system dynamic control equation to obtain a target drill bit-drill string system dynamic control equation;

[0092] The motion state identification and analysis module 13 is used to solve the dynamic control equation of the target drill bit-drill string system to obtain a dynamic response value, and realize motion state identification and analysis of the downhole drilling tool based on the dynamic response value.

[0093] In this embodiment, downhole near-drill bit engineering parameters are obtained, and motion characteristic analysis and excitation characteristic analysis are performed on the downhole near-drill bit engineering parameters respectively to obtain bottom hole drill tool motion characteristics and drilling pressure torque excitation characteristics; the bottom hole drill tool motion characteristics and the drilling pressure torque excitation characteristics are used to establish an initial drill bit-drill string system dynamics control equation, and the initial drill bit-drill string system dynamics control equation is corrected and supplemented with parameters to obtain a target drill bit-drill string system dynamics control equation; the target drill bit-drill string system dynamics control equation is solved to obtain a dynamic response value, and the motion state recognition and analysis of the downhole drilling tool is realized based on the dynamic response value. The present application obtains accurately measured downhole near-drill bit engineering parameters, and based on the downhole near-drill bit engineering parameters, can analyze the motion characteristics of the bottom hole drill tool and the drilling pressure torque excitation characteristics to construct the drill bit-drill string system dynamic control equation, thereby improving the accuracy of downhole drilling tool state identification, and solving the drill bit-drill string system dynamic control equation to achieve motion state identification and analysis of the downhole drilling tool, which can improve the profitability of single wells in long horizontal shale gas drilling, reduce the well construction cycle, and reduce drilling costs.

[0094] In some specific embodiments, the feature analysis module 11 may specifically include:

[0095] A bottom hole drilling tool motion characteristic analysis module is used to perform a bottom hole drilling tool motion characteristic analysis on the downhole near-drill bit engineering parameters using a Fourier transform method to obtain a bottom hole drilling tool motion characteristic;

[0096] The drilling pressure torque excitation characteristic analysis module is used to perform drilling pressure torque excitation characteristic analysis on the downhole near-drill bit engineering parameters by using wavelet analysis to obtain drilling pressure torque excitation characteristics.

[0097] In some specific embodiments, the dynamic control equation establishment module 12 may specifically include:

[0098] A calculation module, used to calculate the beam unit kinetic energy, beam unit potential energy and unit and system stiffness damping force by using the bottom hole drilling tool motion characteristics and the drilling pressure torque excitation characteristics;

[0099] The initial equation establishment module is used to establish the system stiffness Lagrangian equation, and substitute the beam unit kinetic energy, the beam unit potential energy, and the unit and system stiffness damping force into the system stiffness Lagrangian equation to obtain the initial drill bit-drill string system dynamics control equation.

[0100] In some specific embodiments, the motion state recognition and analysis module 13 may specifically include:

[0101] A basis vector determination module, used to determine a trial matrix whose matrix type is orthogonal, and use the trial matrix as a basis vector;

[0102] The dynamic response value calculation module is used to adopt the Ritz method and substitute the base vector into the target drill bit-drill string system dynamic control equation for simplification to obtain a simplified equation, and adopt the generalized Jacobi method to solve the simplified equation to obtain a dynamic response value.

[0103] In some specific embodiments, the motion state recognition and analysis module 13 may specifically include:

[0104] A first simplification module is used to use a modal transformation method and substitute the basis vector into the target drill bit-drill string system dynamics control equation so as to transform the target drill bit-drill string system dynamics control equation from a physical space to a modal space to obtain a simplified equation;

[0105] The second simplification module is used to use the array superposition method or the direct integration method and substitute the basis vector into the target drill bit-drill string system dynamics control equation so as to transform the target drill bit-drill string system dynamics control equation into a one-dimensional uncoupled differential equation to obtain the simplified equation.

[0106] In some specific embodiments, the motion state recognition and analysis module 13 may specifically include:

[0107] A discretization module is used to discretize the simplified equation in the time domain to obtain a discretized equation;

[0108] The dynamic response value calculation module is used to substitute the downhole near-drill-bit engineering parameters into the discretized equation by the Newmark method to solve it, so as to obtain the dynamic response value.

[0109] In some specific embodiments, the motion state recognition and analysis module 13 may specifically include:

[0110] A motion state identification and analysis module is used to implement drill bit type vibration characteristic analysis, drilling pressure torque excitation characteristic analysis and drilling state conversion analysis of downhole drilling tools based on the dynamic response value; wherein the drill bit type vibration characteristic analysis includes roller bit-drill string vibration characteristic analysis and polycrystalline diamond composite piece drill bit-drill string vibration characteristic analysis.

[0111] Fig.13A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device 20 may specifically include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 is used to store a computer program, which is loaded and executed by the processor 21 to implement the relevant steps in the method for identifying the state of a downhole drilling tool performed by the electronic device disclosed in any of the aforementioned embodiments.

[0112] In this embodiment, the power supply 23 is used to provide working voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and the external device, and the communication protocol it follows is any communication protocol that can be applied to the technical solution of the present application, and is not specifically limited here; the input and output interface 25 is used to obtain external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs and is not specifically limited here.

[0113] In addition, the memory 22, as a carrier for storing resources, can be a read-only memory, a random access memory, a disk or an optical disk, etc. The resources stored thereon include an operating system 221, a computer program 222 and data 223, etc. The storage method can be temporary storage or permanent storage.

[0114] Among them, the operating system 221 is used to manage and control the hardware devices and computer programs 222 on the electronic device 20 to realize the operation and processing of the data 223 in the memory 22 by the processor 21, which can be Windows, Unix, Linux, etc. In addition to including a computer program that can be used to complete the downhole drilling tool state identification method performed by the electronic device 20 disclosed in any of the aforementioned embodiments, the computer program 222 can further include a computer program that can be used to complete other specific tasks. In addition to data transmitted from an external device received by the downhole drilling tool equipment, the data 223 can also include data collected by its own input and output interface 25, etc.

[0115] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0116] Furthermore, an embodiment of the present application also discloses a computer-readable storage medium, in which a computer program is stored. When the computer program is loaded and executed by a processor, the steps of the method for identifying the state of a downhole drilling tool disclosed in any of the aforementioned embodiments are implemented.

[0117] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0118] The above is a detailed introduction to a method, device, equipment and storage medium for identifying the state of a downhole drilling tool provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for a general technician in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for identifying the state of a downhole drilling tool, characterized in that: include: Acquire downhole near-drill-bit engineering parameters, and respectively perform motion characteristic analysis and excitation characteristic analysis on the downhole near-drill-bit engineering parameters to obtain bottom hole drilling tool motion characteristics and drilling pressure torque excitation characteristics; Establishing an initial drill bit-drill string system dynamics control equation using the bottom hole drilling tool motion characteristics and the bit pressure torque excitation characteristics, and performing parameter correction and supplementation on the initial drill bit-drill string system dynamics control equation to obtain a target drill bit-drill string system dynamics control equation; The target drill bit-drill string system dynamics control equation is solved to obtain a dynamic response value, and the motion state identification and analysis of the downhole drilling tool is realized based on the dynamic response value.

2. The method for identifying the state of a downhole drilling tool according to claim 1, characterized in that: The motion characteristic analysis and excitation characteristic analysis of the downhole near-drill-bit engineering parameters are respectively performed to obtain the motion characteristics of the bottom hole drilling tool and the excitation characteristics of the drilling pressure torque, including: Using Fourier transform method to analyze the motion characteristics of the bottom hole drilling tool on the downhole near-drill bit engineering parameters to obtain the motion characteristics of the bottom hole drilling tool; The wavelet analysis method is used to analyze the drilling pressure torque excitation characteristics of the downhole near-drill bit engineering parameters to obtain the drilling pressure torque excitation characteristics.

3. The method for identifying the state of a downhole drilling tool according to claim 1, characterized in that: The method of establishing an initial drill bit-drill string system dynamic control equation by using the bottom hole drilling tool motion characteristics and the drilling pressure torque excitation characteristics includes: Calculating the beam unit kinetic energy, beam unit potential energy, and unit and system stiffness damping force using the bottom hole drilling tool motion characteristics and the drilling pressure torque excitation characteristics; A system stiffness Lagrangian equation is established, and the beam unit kinetic energy, the beam unit potential energy, and the unit and system stiffness damping force are substituted into the system stiffness Lagrangian equation to obtain the initial drill bit-drill string system dynamics control equation.

4. The method for identifying the state of a downhole drilling tool according to claim 1, characterized in that: The step of solving the target drill bit-drill string system dynamics control equation to obtain a dynamic response value includes: Determine a trial matrix whose matrix type is orthogonal, and use the trial matrix as a basis vector; The Ritz method is used and the base vector is substituted into the target drill bit-drill string system dynamic control equation for simplification to obtain a simplified equation, and the simplified equation is solved by the generalized Jacobi method to obtain a dynamic response value.

5. The method for identifying the state of a downhole drilling tool according to claim 4, characterized in that: The Ritz method is used and the base vector is substituted into the target drill bit-drill string system dynamic control equation for simplification to obtain a simplified equation, including: Using a modal transformation method, substituting the basis vector into the target drill bit-drill string system dynamics control equation, so as to transform the target drill bit-drill string system dynamics control equation from a physical space to a modal space, and obtain a simplified equation; Alternatively, the array superposition method or the direct integration method is used and the basis vector is substituted into the target drill bit-drill string system dynamics control equation so as to transform the target drill bit-drill string system dynamics control equation into a one-dimensional non-coupled differential equation to obtain the simplified equation.

6. The method for identifying the state of a downhole drilling tool according to claim 4, characterized in that: The generalized Jacobi method is used to solve the simplified equation to obtain a dynamic response value, including: Discretize the simplified equation in the time domain to obtain the discretized equation; The downhole near-drill-bit engineering parameters are substituted into the discretized equations by the Newmark method to obtain the dynamic response values.

7. The method for identifying the state of a downhole drilling tool according to any one of claims 1 to 6, characterized in that: The method of realizing the motion state identification and analysis of the downhole drilling tool based on the dynamic response value includes: Based on the dynamic response value, the drill bit type vibration characteristic analysis, the drilling pressure torque excitation characteristic analysis and the drilling state conversion analysis of the downhole drilling tool are realized; wherein, the drill bit type vibration characteristic analysis includes the roller cone drill bit-drill string vibration characteristic analysis and the polycrystalline diamond composite drill bit-drill string vibration characteristic analysis.

8. A downhole drilling tool status identification device, characterized in that: include: A feature analysis module is used to obtain downhole near-drill-bit engineering parameters, and to perform motion feature analysis and excitation feature analysis on the downhole near-drill-bit engineering parameters to obtain bottom hole drilling tool motion features and drilling pressure torque excitation features; A dynamic control equation establishment module is used to establish an initial drill bit-drill string system dynamic control equation by using the bottom hole drilling tool motion characteristics and the bit pressure torque excitation characteristics, and to perform parameter correction and supplement on the initial drill bit-drill string system dynamic control equation to obtain a target drill bit-drill string system dynamic control equation; The motion state identification and analysis module is used to solve the dynamic control equation of the target drill bit-drill string system to obtain a dynamic response value, and realize the motion state identification and analysis of the downhole drilling tool based on the dynamic response value.

9. An electronic device, characterized in that: include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the method for identifying the state of a downhole drilling tool as claimed in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Used to store a computer program; wherein, when the computer program is executed by a processor, the method for identifying the state of a downhole drilling tool as described in any one of claims 1 to 7 is implemented.

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