Three-dimensional modeling analysis method, system and equipment for roller bit and medium

Abstract

The invention relates to a roller bit three-dimensional modeling analysis method, system, equipment and medium, and the method comprises the steps: building a finite element mesh model according to the structure size data of a roller bit bearing sealing system and drilling parameters under a field working condition; obtaining an optimal hyperelastic material coefficient and an optimal viscoelastic material coefficient according to the material mechanical test data of the rubber O-shaped ring under the same temperature gradient; and performing dynamic solution settlement on the finite element mesh model based on the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient to obtain an analysis result comprising two contact pressure diagrams, according to the method, the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient which most fit the actual condition are determined by tightly combining real material mechanical test data, and then simulation analysis is performed by combining the finite element mesh model, so that the condition that constitutive model parameters are inaccurate in related technologies can be eliminated; the actual drilling working condition is truly reflected, the calculation precision is high, and an accurate reference basis is provided for designers.

Description

Technical Field

[0001] The present application relates to the technical field of bearing sealing systems, and in particular to a three-dimensional modeling and analysis method, system, equipment and medium for a roller drill bit. Background Art

[0002] In recent years, rubber seals have achieved major breakthroughs in theoretical mechanism research, material preparation technology, forward design technology, and product production processes. With the development of industrial technology, rubber sealing working conditions have become increasingly harsh. Coupled with the enhancement of global environmental awareness, rubber sealing technology is also facing new challenges.

[0003] For example, the bearing sealing system is one of the most important structures of the roller drill bit, and the sealing performance directly affects the service life of the drill bit. The sealing and lubrication systems of the drill bit are easily damaged under high temperature conditions. Once the drilling fluid enters the bearing sealing system, it will quickly wear out the seals and cause the seal to fail, which seriously affects the drilling efficiency. The bearing sealing system is the key structure of the roller drill bit, among which the O-ring is the core component. The sealing system is the heart of the roller drill bit. The quality of the sealing system directly affects or even determines the success or failure of the roller drill bit working underground.

[0004] In addition, the simulation method relies on the development of computing technology. Combined with the concept of finite element software, it can truly describe the physical nature of complex systems. It is an effective means to study sealing systems and reduce the empirical trial and error cycle. The relevant simulation methods mainly focus on the output results of the hyperelastic material model for design, but the sealing performance of the designed O-ring is difficult to meet the sealing requirements under high temperature conditions of actual drilling conditions, and the design iteration process is relatively cumbersome and time-consuming.

[0005] Therefore, how to design an O-ring that meets actual drilling conditions is an urgent problem to be solved. Summary of the invention

[0006] The embodiments of the present application provide a three-dimensional modeling and analysis method, system, equipment and medium for a roller drill bit to solve the problem that the relevant simulation method in the related art mainly focuses on the output results of the hyperelastic material model for design, but the sealing performance of the designed O-ring is difficult to meet the sealing requirements under high temperature conditions of actual drilling conditions, and the design iteration process is relatively cumbersome and time-consuming.

[0007] In a first aspect, a three-dimensional modeling and analysis method for a roller drill bit is provided, comprising:

[0008] A finite element mesh model is established according to the structural dimension data of the roller bit bearing sealing system, and then boundary conditions of the finite element mesh model are defined according to the drilling parameters under the field working conditions;

[0009] The optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient are obtained based on the material mechanical test data of the rubber O-ring under the same temperature gradient;

[0010] The finite element mesh model is dynamically solved and settled based on the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient to obtain two contact pressure diagrams; the two contact pressure diagrams are used as analysis results under the same temperature gradient.

[0011] In some embodiments, the following steps are also included:

[0012] Obtain material mechanical test data of rubber O-rings under different temperature gradients;

[0013] The steps of obtaining the analysis results of the rubber O-ring under the same temperature gradient according to the material mechanical test data of the rubber O-ring under the same temperature gradient are repeated to obtain the analysis results of the rubber O-ring under different temperature gradients.

[0014] In some embodiments, the material mechanical test data include test data of a uniaxial tensile test, an equibiaxial tensile test, a planar tensile test, and a stress relaxation test of a rubber O-ring under the same temperature gradient.

[0015] In some embodiments, obtaining the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient according to the material mechanical test data of the rubber O-ring under the same temperature gradient specifically includes the following steps:

[0016] The test data of the uniaxial tensile test, the test data of the equibiaxial tensile test and the test data of the plane tensile test are respectively formed into a measured stress-strain curve, and then the optimal hyperelastic material coefficient is calculated according to the three measured stress-strain curves and the design rule one;

[0017] According to the experimental data of stress relaxation test and design rule 2, the optimal viscoelastic material coefficient is obtained.

[0018] In some embodiments, the design rule 1 specifically includes the following steps:

[0019] Obtain theoretical stress-strain curves of Mooney-Rivlin constitutive model, Yoeh constitutive model and Ogden constitutive model;

[0020] Select the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the uniaxial tensile test from the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, and record the similarity value;

[0021] Select the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the equibiaxial tensile test from the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, and record the similarity value;

[0022] Among the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the plane tensile test is selected and recorded as the similarity value;

[0023] The three similarity values ​​are compared to select the constitutive model with the largest similarity value as the final model;

[0024] The measured stress-strain curve and the theoretical stress-strain curve corresponding to the constitutive model with the largest similarity value are fitted using the least squares method to obtain the optimal hyperelastic material coefficient.

[0025] In some embodiments, the second design rule specifically includes the following steps:

[0026] Obtain test data on stress-relaxation tests on stress-time;

[0027] The experimental data of the stress relaxation test on stress-time are input into the viscoelastic constitutive model formed based on the Maxwell model;

[0028] The Prony series equation of the viscoelastic constitutive model is used to fit the optimal viscoelastic material coefficient using the least square method; the optimal viscoelastic material coefficient includes a viscoelastic coefficient related to the bulk modulus and an elastic coefficient related to the shear modulus.

[0029] In some embodiments, establishing a finite element mesh model based on the structural dimension data of the roller bit bearing sealing system includes the following steps:

[0030] Obtain the structural dimension data of the gear, tooth palm, metal sealing ring and rubber O-ring;

[0031] The cone and the cone palm of the cone bit bearing sealing system are established as rigid bodies according to the structural dimension data;

[0032] Then, remote points are set on the gear and the tooth palm, respectively, and the translation of the gear and the tooth palm in the x-axis, y-axis and z-axis directions, and the rotation in the x-axis, y-axis and z-axis directions are constrained at the remote points;

[0033] Then, the metal sealing ring and the rubber O-ring are modeled in the coordinate system of the gear and the tooth base according to the structural dimension data to form the finite element mesh model.

[0034] In a second aspect, a three-dimensional modeling and analysis system for a roller cone drill bit is provided, and the three-dimensional modeling and analysis system for a roller cone drill bit comprises:

[0035] The first module is used to establish a finite element mesh model according to the structural dimension data of the roller bit bearing sealing system, and then define the boundary conditions of the finite element mesh model according to the drilling parameters under the field working conditions;

[0036] The second module is used to obtain the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient according to the material mechanical test data of the rubber O-ring under the same temperature gradient;

[0037] The third module is used to perform dynamic solution and settlement on the finite element mesh model based on the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient respectively to obtain two contact pressure diagrams; and the two contact pressure diagrams are used as analysis results under the same temperature gradient.

[0038] In a third aspect, a three-dimensional modeling and analysis method device for a roller drill bit is provided, the three-dimensional modeling and analysis method device for a roller drill bit comprising a processor, a memory, and a three-dimensional modeling and analysis method program for a roller drill bit stored in the memory and executable by the processor, wherein when the three-dimensional modeling and analysis method program for a roller drill bit is executed by the processor, the steps of the three-dimensional modeling and analysis method for a roller drill bit are implemented.

[0039] In a fourth aspect, a computer-readable storage medium is provided, on which a three-dimensional modeling and analysis method program for a roller drill bit is stored. When the three-dimensional modeling and analysis method program for a roller drill bit is executed by a processor, the steps of the three-dimensional modeling and analysis method for a roller drill bit are implemented.

[0040] The beneficial effects of the technical solution provided by this application include:

[0041] The embodiment of the present application provides a three-dimensional modeling and analysis method, system, device and medium for a roller drill bit. A finite element mesh model is established according to the structural dimension data of a roller drill bit bearing sealing system, and then the boundary conditions of the finite element mesh model are defined according to the drilling parameters under field conditions; an optimal hyperelastic material coefficient and an optimal viscoelastic material coefficient are obtained according to the material mechanics test data of a rubber O-ring under the same temperature gradient; the finite element mesh model is dynamically solved and settled based on the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient, respectively, to obtain two contact pressure diagrams; the two contact pressure diagrams are used as analysis results under the same temperature gradient. The optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient that best fit the actual situation are determined by closely combining the material mechanics test data of the real experiment, and simulation analysis is performed in the finite element mesh model whose boundaries are defined according to the drilling parameters under field conditions. This can eliminate the inaccuracy of the constitutive model parameters in the related art, truly reflect the actual drilling conditions with high calculation accuracy; in addition, the two contact pressure diagrams obtained correspond to the cases where stress relaxation is considered and the cases where stress relaxation is not considered, which can be compared and provide a reference for designers. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 It is a parametric modeling flow chart of the finite element numerical model of the present invention;

[0044] Figure 2 It is a finite element mesh model of the roller drill bit of the present invention.

[0045] Figure 3 It is the mesh diagram of the metal seal ring gear;

[0046] Figure 4 It is the O-ring gear mesh diagram;

[0047] Figure 5 It is a schematic diagram of the contact stress between the O-ring and the gear in the stress relaxation-free stage at 260 degrees of the present invention;

[0048] Figure 6 It is a schematic diagram of the contact stress between the O-ring and the tooth palm of the present invention at 260 degrees in the stress relaxation-free stage;

[0049] Figure 7 This is a schematic diagram of the contact stress between the O-ring and the gear in the stress relaxation stage at 260 degrees of the present invention;

[0050] Figure 8 It is a schematic diagram of the contact stress between the O-ring and the tooth palm during the stress relaxation stage of the present invention at 260 degrees. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0052] Some technical terms that should be understood for this application:

[0053] (1) About the constitutive model

[0054] There are many types of constitutive models for rubber. The earliest constitutive models were polynomial models and Ogden models, both based on the theory of continuous medium mechanics. Later, models based on the statistical theory of thermodynamics appeared. There are seven commonly used polynomial models: Neo-Hooke model, Mooney-Rivlin model, Yeoh model, Ogden model, Van der Waals model, Arruda-Boyce model, and Marlow model.

[0055] The material coefficients of different constitutive models are obtained by least squares fitting the measured stress-strain and the theoretically calculated stress-strain of each constitutive model.

[0056] (2) Test data

[0057] There are six basic experiments to describe rubber materials:

[0058] Uniaxial tension and compression test, biaxial tension and compression test, plane tension and compression (pure shear) test and volume change test (tension or compression). At present, the international definition of the mechanical behavior of rubber materials is: uniaxial tension, biaxial tension, plane shear and volume compression.

[0059] The material coefficients of different constitutive models are obtained by least squares fitting the measured stress-strain and the stress-strain calculated theoretically from each constitutive model.

[0060] (3) Analysis of rubber simulation calculations generally requires the selection of a hyperelastic material model. The hyperelastic material model assumes that the material is isotropic, isothermal and elastic, completely or nearly incompressible, and is an idealization of real rubber behavior.

[0061] Viscoelasticity defines the combination of viscosity and elasticity in a material, where the material is not only elastic but also has friction. When the stress is removed, part of the work is converted into heat due to frictional effects, which can be represented by a stress-strain curve. The contribution of viscosity and elasticity depends on time, temperature, stress and strain rate. Creep, stress relaxation and permanent deformation are important manifestations of the viscoelastic behavior of rubber.

[0062] (4) Both the Maxwell model and the Prgny series are commonly used models and methods in the fields of material mechanics and physics. The generalized Maxwell model is a model that describes the viscoelastic behavior of materials, while the Prgny series is a mathematical method used to describe the elastic and viscous behavior of materials.

[0063] In addition, in order to facilitate understanding of the concept of this application, the following explanations should also be understood:

[0064] Since the mechanical behavior of rubber materials has temperature and time characteristics, it is necessary to carry out experimental research on the mechanical behavior of rubber under high temperature conditions, and it is necessary to consider the influence of stress relaxation on the mechanical behavior of rubber. Using advanced test methods, we carry out uniaxial tensile tests (pure tensile state), plane tensile tests (pure shear state), equibiaxial tensile tests (pure compression state), stress relaxation tests and volume compression tests on rubber under different temperature conditions.

[0065] Because rubber has the characteristics of large deformation and small volume change when subjected to external force. In most cases, considering the calculation efficiency and economic cost, rubber materials are usually considered to be incompressible in volume, but in fact, the volume of rubber materials is compressible. In order to obtain accurate material mechanical property parameters and curves, it is necessary to carry out volume compression test research. When conducting a volume compression test, a cylindrical rubber specimen is placed in a fixed fixture and a compressive load is applied. During the test, the engineering stress-strain curve can be directly given. The slope of the curve can be used to calculate the bulk modulus of the rubber material. Generally, the bulk modulus is 2 to 3 orders of magnitude higher than the shear modulus.

[0066] Stress relaxation and creep are typical viscoelastic properties of rubber. From a mechanical point of view, stress relaxation test and creep test are equivalent. Therefore, to test the viscoelastic properties of rubber, only one of the two tests, stress relaxation test or creep test, is needed. The essence of stress relaxation test is that when a rubber material is stretched to a specific strain state and then maintains this strain state unchanged, the stress will gradually decay with the extension of time and approach the limit value infinitely.

[0067] From the above, we can know that the performance of rubber is different under different temperature gradients. When it is specifically applied in the bearing sealing system of the roller bit, due to different drilling conditions, under the requirement of ensuring sealing, in order to make the designed rubber O-ring meet the use of different working conditions, it is necessary to ensure that the analysis results of the output of the simulation analysis are relatively accurate, so that corresponding design and adjustment can be carried out. The relevant simulation methods mainly focus on the impact of temperature and expansion coefficient on the results, but it is difficult to meet the sealing requirements under high temperature conditions of actual drilling conditions, and the design iteration process is cumbersome and time-consuming.

[0068] refer to Figure 2 , Figure 2 The metal sealing ring palm, metal sealing ring gear, palm, O-ring palm, O-ring gear, and gear are marked with b, a, d, c, e, and f respectively. This application is a simulation analysis of the O-ring palm and O-ring gear. The O-ring palm and O-ring gear are rubber O-rings.

[0069] Therefore, how to solve the problem that the relevant simulation methods mainly focus on the output results of the hyperelastic material model for design, but the sealing performance of the designed O-ring is difficult to meet the sealing requirements under high temperature conditions of actual drilling conditions, and the design iteration process is cumbersome and time-consuming, and how to quickly combine the data of the compression test and the stress relaxation test to output the analysis results, which needs to be solved. The following is an explanation of the simulation analysis under the same temperature gradient:

[0070] refer to Figure 1 In a first aspect, a three-dimensional modeling and analysis method for a roller drill bit is provided, which comprises:

[0071] Step 100: Establish a finite element mesh model based on the structural dimension data of the roller bit bearing seal system, and then define the boundary conditions of the finite element mesh model based on the drilling parameters under the field working conditions; the finite element mesh model is Figure 2 As shown, the metal sealing ring gear a is as shown Figure 3 The model shown here is built using mesh elements, and the O-ring gear e is Figure 4 The model shown is built using grid units; the modeling methods of the metal sealing ring tooth palm a and the O-ring tooth palm c are the same and will not be shown in detail here.

[0072] Step 101, obtaining an optimal hyperelastic material coefficient and an optimal viscoelastic material coefficient according to material mechanics test data of the rubber O-ring under the same temperature gradient; the material mechanics test data include test data of a uniaxial tensile test, an equibiaxial tensile test, a planar tensile test, and a stress relaxation test of the rubber O-ring under the same temperature gradient;

[0073] Step 102, define the automatic step size and total analysis time of the finite element mesh model, and then perform dynamic solution settlement on the finite element mesh model based on the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient to obtain two contact pressure diagrams; the two contact pressure diagrams are used as the analysis results under the same temperature gradient. The analysis results are as follows Figure 5-Figure 8 The contact stress diagram is shown in Figure 2. Based on the analysis results, corresponding design changes can be made until the design requirements are met.

[0074] The above method determines the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient that best fit the actual situation by closely combining the material mechanics test data of the real experiment, and participates in the simulation analysis in the finite element mesh model with the boundary defined by the drilling parameters under the field conditions. It can eliminate the inaccuracy of the constitutive model parameters in the relevant technology and truly reflect the actual drilling conditions with high calculation accuracy. In addition, the two contact pressure diagrams corresponding to the cases of considering stress relaxation and not considering stress relaxation can be compared, providing a reference for designers.

[0075] In some preferred embodiments, step 103 is further included, and step 103 is specifically:

[0076] Step 10300, obtaining material mechanical test data of the rubber O-ring under different temperature gradients;

[0077] Step 10300, repeating steps 100 to 102 to obtain analysis results of the rubber O-ring at different temperature gradients. That is, repeating the step of obtaining the analysis results of the rubber O-ring at the same temperature gradient according to the material mechanics test data of the rubber O-ring at the same temperature gradient to obtain the analysis results of the rubber O-ring at different temperature gradients.

[0078] In this way, analysis results under different temperature gradients can be obtained, and the parameters that engineers are concerned about can be obtained, providing a reference basis for optimizing the sealing effect of the O-ring.

[0079] In some preferred embodiments, step 101 specifically includes the following steps:

[0080] The optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient are obtained according to the material mechanical test data of the rubber O-ring under the same temperature gradient, specifically including the following steps:

[0081] Step 10100, forming a measured stress-strain curve with the test data of the uniaxial tensile test, the test data of the equibiaxial tensile test and the test data of the plane tensile test respectively, and then calculating the optimal hyperelastic material coefficient according to the three measured stress-strain curves and design rule 1;

[0082] Step 10101: Obtain the optimal viscoelastic material coefficient based on the test data of the stress relaxation test and in accordance with design rule 2.

[0083] Among them, the design rule one specifically includes the following steps:

[0084] Obtain theoretical stress-strain curves of Mooney-Rivlin constitutive model, Yoeh constitutive model and Ogden constitutive model;

[0085] Select the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the uniaxial tensile test from the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, and record the similarity value;

[0086] Select the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the equibiaxial tensile test from the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, and record the similarity value;

[0087] Among the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the plane tensile test is selected and recorded as the similarity value;

[0088] The three similarity values ​​are compared, and the constitutive model with the largest similarity value is taken as the final model;

[0089] The measured stress-strain curve and the theoretical stress-strain curve corresponding to the constitutive model with the largest similarity value are fitted using the least squares method to obtain the optimal hyperelastic material coefficient.

[0090] By designing rule one, a constitutive model that best fits the actual test data can be selected from a variety of test types of constitutive models, so that the optimal hyperelastic material coefficient calculated is convenient for the accuracy of simulation analysis.

[0091] Design rule 2 specifically includes the following steps:

[0092] Obtain test data on stress-relaxation tests on stress-time;

[0093] The experimental data of the stress relaxation test on stress-time are input into the viscoelastic constitutive model formed based on the Maxwell model;

[0094] The Prony series equation of the viscoelastic constitutive model is used to fit the optimal viscoelastic material coefficient using the least square method; the optimal viscoelastic material coefficient includes a viscoelastic coefficient related to the bulk modulus and an elastic coefficient related to the shear modulus.

[0095] The determination of the above optimal viscoelastic material coefficients depends on whether the test data can be fully and accurately described. The compressibility of rubber is also very important. The compressibility is related to the bulk modulus, so the influence of volume compression is also fully considered to accurately describe the viscoelastic constitutive model of rubber.

[0096] This is because the bulk modulus is related to the compressibility of rubber; the bulk modulus is a physical quantity that describes the change in volume of a material when it is subjected to equal pressure in all directions. Within the elastic range, the bulk modulus reflects the resistance of an object when it is compressed, that is, the resistance of the object's volume to uniform compression.

[0097] The test data of the stress relaxation test includes the measured data:

[0098] Shear stress vs. time

[0099] τ0, time0; τ1, time1; τ2, time2; τ3, time3;

[0100] The test data of the stress relaxation test can only be used after normalization, and all measured stress values ​​are normalized with the initial shear stress τ0:

[0101] τ0 / τ0,time0; τ1 / τ0,time1; τ2 / τ0,time2;

[0102] τ3 / τ0,time3;

[0103] The above analysis is performed using ABAQUS, which is a commonly used finite element analysis software. The viscoelastic constitutive model is the Maxwell model, and the Prony series of the Maxwell model is expressed as follows:

[0104]

[0105] In Abaqus, G0 and K0 are determined by fitting the Prony series curve using stress relaxation test data. Abaqus will use the elastic modulus and Poisson's ratio specified by the user to determine G and K. G0 and K0 are the transient moduli of the viscoelastic material. are the coefficients of the Prony series. is the shear modulus, is the bulk modulus. G(τ) and K(τ) represent the basic form of expressing viscoelastic properties using Prony series, namely, the viscoelastic coefficient with respect to the bulk modulus and the elastic coefficient with respect to the shear modulus, respectively.

[0106] The above illustrates that the stress-time stress relaxation experimental data is used, which can finally be converted into a shear / bulk modulus-time curve.

[0107] In step 100, a finite element mesh model is established according to the structural dimension data of the roller bit bearing sealing system, including the following steps:

[0108] Obtain the structural dimension data of the gear, tooth palm, metal sealing ring and rubber O-ring;

[0109] The cone and the palm of the cone bit bearing sealing system are established as rigid bodies according to the structural dimension data;

[0110] Then, remote points are set on the gear and the tooth palm, respectively, and the translation of the gear and the tooth palm in the x-axis, y-axis and z-axis directions, and the rotation in the x-axis, y-axis and z-axis directions are constrained at the remote points;

[0111] Then, the metal sealing ring and the rubber O-ring are modeled in the coordinate system of the gear and the tooth palm according to the structural dimension data to form a finite element mesh model.

[0112] In a second aspect, a three-dimensional modeling and analysis system for a roller cone drill bit is provided, and the three-dimensional modeling and analysis system for a roller cone drill bit includes:

[0113] The first module is used to establish a finite element mesh model according to the structural dimension data of the roller bit bearing sealing system, and then define the boundary conditions of the finite element mesh model according to the drilling parameters under the field working conditions;

[0114] The second module is used to obtain the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient according to the material mechanical test data of the rubber O-ring under the same temperature gradient;

[0115] The third module is used to perform dynamic solution and settlement on the finite element mesh model based on the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient respectively to obtain two contact pressure diagrams; the two contact pressure diagrams are used as analysis results under the same temperature gradient.

[0116] Among them, the functional implementation of each module in the above-mentioned three-dimensional modeling and analysis system for roller drill bits corresponds to the various steps in the above-mentioned three-dimensional modeling and analysis method embodiment for roller drill bits, and their functions and implementation processes will not be repeated here one by one.

[0117] In a third aspect, an embodiment of the present application provides a three-dimensional modeling and analysis device for a roller drill bit. The three-dimensional modeling and analysis device for a roller drill bit can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0118] In the embodiment of the present application, the three-dimensional modeling and analysis device for a roller drill bit may include a processor, a memory, a communication interface, and a communication bus.

[0119] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0120] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the three-dimensional modeling and analysis device of the roller drill bit, and the interface used to realize the interconnection of the three-dimensional modeling and analysis device of the roller drill bit with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0121] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0122] The processor may be a general-purpose processor, which may call the three-dimensional modeling and analysis program for the roller drill bit stored in the memory and execute the three-dimensional modeling and analysis method for the roller drill bit provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the three-dimensional modeling and analysis program for the roller drill bit is called may refer to the various embodiments of the three-dimensional modeling and analysis method for the roller drill bit of the present application, which will not be described in detail here.

[0123] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0124] The computer-readable storage medium of the present application stores a three-dimensional modeling and analysis program for a roller drill bit, wherein when the three-dimensional modeling and analysis program for a roller drill bit is executed by a processor, the steps of the three-dimensional modeling and analysis method for a roller drill bit as described above are implemented.

[0125] Among them, the method implemented when the three-dimensional modeling and analysis program for the roller drill bit is executed can refer to the various embodiments of the three-dimensional modeling and analysis method for the roller drill bit of the present application, and will not be repeated here.

[0126] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0127] It should be noted that, in this application, relational terms such as "first" and "second" 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.

[0128] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A three-dimensional modeling and analysis method for a roller drill bit, characterized in that: It includes: A finite element mesh model is established according to the structural dimension data of the roller bit bearing sealing system, and then boundary conditions of the finite element mesh model are defined according to the drilling parameters under the field working conditions; The optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient are obtained based on the material mechanical test data of the rubber O-ring under the same temperature gradient; The finite element mesh model is dynamically solved and settled based on the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient to obtain two contact pressure diagrams; the two contact pressure diagrams are used as analysis results under the same temperature gradient.

2. The three-dimensional modeling and analysis method of a roller drill bit according to claim 1, characterized in that: The following steps are also included: Obtain material mechanical test data of rubber O-rings under different temperature gradients; The steps of obtaining the analysis results of the rubber O-ring under the same temperature gradient according to the material mechanical test data of the rubber O-ring under the same temperature gradient are repeated to obtain the analysis results of the rubber O-ring under different temperature gradients.

3. The three-dimensional modeling and analysis method for a roller drill bit according to claim 1, characterized in that: The material mechanical test data include the test data of uniaxial tension test, equibiaxial tension test, plane tension test and stress relaxation test of rubber O-ring under the same temperature gradient.

4. The three-dimensional modeling and analysis method of a roller drill bit according to claim 3, characterized in that: The optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient are obtained according to the material mechanical test data of the rubber O-ring under the same temperature gradient, specifically including the following steps: The test data of the uniaxial tensile test, the test data of the equibiaxial tensile test and the test data of the plane tensile test are respectively formed into a measured stress-strain curve, and then the optimal hyperelastic material coefficient is calculated according to the three measured stress-strain curves and the design rule one; According to the experimental data of stress relaxation test and design rule 2, the optimal viscoelastic material coefficient is obtained.

5. The three-dimensional modeling and analysis method of a roller drill bit according to claim 4, characterized in that: The design rule 1 specifically includes the following steps: Obtain theoretical stress-strain curves of Mooney-Rivlin constitutive model, Yoeh constitutive model and Ogden constitutive model; Select the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the uniaxial tensile test from the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, and record the similarity value; Select the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the equibiaxial tensile test from the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, and record the similarity value; Among the Mooney-Rivlin constitutive model, the Yoeh constitutive model and the Ogden constitutive model, the constitutive model whose theoretical stress-strain curve is most similar to the measured stress-strain curve of the plane tensile test is selected and recorded as the similarity value; The three similarity values ​​are compared to select the constitutive model with the largest similarity value as the final model; The measured stress-strain curve and the theoretical stress-strain curve corresponding to the constitutive model with the largest similarity value are fitted using the least squares method to obtain the optimal hyperelastic material coefficient.

6. The three-dimensional modeling and analysis method of a roller drill bit according to claim 4, characterized in that: The second design rule specifically includes the following steps: Obtain test data on stress-relaxation tests on stress-time; The experimental data of the stress relaxation test on stress-time are input into the viscoelastic constitutive model formed based on the Maxwell model; The Prony series equation of the viscoelastic constitutive model is used to fit the optimal viscoelastic material coefficient using the least square method; the optimal viscoelastic material coefficient includes a viscoelastic coefficient related to the bulk modulus and an elastic coefficient related to the shear modulus.

7. The three-dimensional modeling and analysis method of a roller drill bit according to claim 1, characterized in that: The finite element mesh model is established according to the structural dimension data of the roller bit bearing sealing system, including the following steps: Obtain the structural dimension data of the gear, tooth palm, metal sealing ring and rubber O-ring; The cone and the cone palm of the cone bit bearing sealing system are established as rigid bodies according to the structural dimension data; Then, remote points are set on the gear and the tooth palm, respectively, and the translation of the gear and the tooth palm in the x-axis, y-axis and z-axis directions, and the rotation in the x-axis, y-axis and z-axis directions are constrained at the remote points; Then, the metal sealing ring and the rubber O-ring are modeled in the coordinate system of the gear and the tooth base according to the structural dimension data to form the finite element mesh model.

8. A three-dimensional modeling and analysis system for a roller drill, characterized in that: The three-dimensional modeling and analysis system for roller drill bits comprises: The first module is used to establish a finite element mesh model according to the structural dimension data of the roller bit bearing sealing system, and then define the boundary conditions of the finite element mesh model according to the drilling parameters under the field working conditions; The second module is used to obtain the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient according to the material mechanical test data of the rubber O-ring under the same temperature gradient; The third module is used to perform dynamic solution and settlement on the finite element mesh model based on the optimal hyperelastic material coefficient and the optimal viscoelastic material coefficient respectively to obtain two contact pressure diagrams; and the two contact pressure diagrams are used as analysis results under the same temperature gradient.

9. A three-dimensional modeling and analysis method and device for a roller drill, characterized in that: The three-dimensional modeling and analysis method device for a roller drill bit includes a processor, a memory, and a three-dimensional modeling and analysis method program for a roller drill bit stored in the memory and executable by the processor. When the three-dimensional modeling and analysis method program for a roller drill bit is executed by the processor, the steps of the three-dimensional modeling and analysis method for a roller drill bit as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a three-dimensional modeling and analysis method program for a roller drill bit, wherein when the three-dimensional modeling and analysis method program for a roller drill bit is executed by a processor, the steps of the three-dimensional modeling and analysis method for a roller drill bit according to any one of claims 1 to 7 are implemented.

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