Vibration reduction method and device for drill string

Abstract

The invention provides a drill string vibration reduction method and device.The method comprises the steps that longitudinal vibration data and torsional vibration data of a target drill string when a vibration reduction tool is tripped into multiple positions are obtained, and the longitudinal vibration data comprise hook load, a mass matrix, a stiffness matrix, a structural damping matrix, a drilling fluid damping effect matrix, a speed vector and an acceleration vector; the torsional vibration data comprises a rotational acceleration vector, a rotational speed vector, a rotational inertia matrix, a torsional rigidity matrix, a torsional structure damping matrix and a torsional drilling fluid damping matrix; the vibration intensity of the whole well section is determined by applying the longitudinal vibration model, the torsional vibration model, the longitudinal vibration data and the torsional vibration data; and according to the vibration intensity of the whole well section, the optimal tripping-in position of the vibration reduction tool is selected from all the positions, the vibration reduction tool is tripped into the optimal tripping-in position, and the vibration reduction process of the target drill column is completed. The reliability of the tripping-in position of the vibration reduction tool can be improved, and then the vibration reduction effect of the drill column can be improved.

Description

Technical Field

[0001] The present application relates to the field of drilling and exploration technology, and in particular to a drill string vibration reduction method and device. Background Art

[0002] In the process of oil and gas exploration, more and more proven oil and gas resources are found to be buried in deep strata. Deep well and ultra-deep well drilling technology has become a trend in oil and gas development.

[0003] However, during the drilling process of deep wells, ultra-deep wells, and horizontal wells with long horizontal sections, the drill string vibration intensity is high due to the complex and diverse formations encountered. Frequent and severe vibrations cause the drill string to be subjected to high-frequency alternating stress, which can easily lead to fatigue failure and serious underground safety accidents. Secondly, drill string vibration can easily lead to drill bit failure. The drill string vibration is transmitted to the drill bit, causing the drill bit to vibrate violently and unable to break the rock smoothly. As a result, the drill bit is prone to tooth collapse and failure under vibration impact, the drilling footage is short, and the rock breaking efficiency is reduced, resulting in slow project progress and extended drilling cycles.

[0004] In order to solve this problem and improve the safety of deep well drilling operations, the method of inserting a vibration damper tool is currently commonly used. The existing method of reducing drill string vibration is to use a vibration damping tool to convert the vibration energy into the elastic potential energy and internal energy of the hydraulic oil, or the friction energy between the springs in the vibration damping tool, and release it. This is not only a waste of energy, but the heat generated will also affect the performance of the downhole tool. Furthermore, the position of the vibration damping tool is usually based on experience, because the vibration intensity position is different in different well sections. It is impossible to determine the optimal position of the vibration damping tool based on experience alone, which is likely to result in poor vibration damping effect or even no vibration damping effect. Summary of the invention

[0005] In view of at least one problem in the prior art, the present application proposes a drill string vibration reduction method and device, which can improve the reliability of the lowering position of the vibration reduction tool, thereby improving the effect of drill string vibration reduction.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] In a first aspect, the present application provides a drill string vibration reduction method, comprising:

[0008] Acquire longitudinal vibration data and torsional vibration data corresponding to a target drill string when a vibration reduction tool is lowered into a plurality of positions of the target drill string, respectively, wherein the longitudinal vibration data includes: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector, and the torsional vibration data includes: rotational acceleration vector, rotational speed vector, moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix;

[0009] Determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position by using a pre-constructed longitudinal vibration model, a pre-constructed torsional vibration model, and longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions;

[0010] According to the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, the optimal lowering position of the vibration reduction tool is selected from each of the positions, and the vibration reduction tool is lowered to the optimal lowering position to complete the vibration reduction process of the target drill string.

[0011] In one embodiment, the applying of the pre-built longitudinal vibration model, the pre-built torsional vibration model, the longitudinal vibration data and the torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions to determine the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to the position comprises:

[0012] Determine the displacement vector corresponding to the target drill string when the vibration reduction tool is lowered to the position by applying a pre-constructed longitudinal vibration model and longitudinal vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each position;

[0013] Determine the torsional angle vector of the target drill string when the vibration reduction tool is lowered to the position based on a pre-constructed torsional vibration model and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each position;

[0014] Determine the stress distribution of the target drill string when the vibration reduction tool is lowered to the position according to the displacement vector and the torsion angle vector corresponding to the target drill string when the vibration reduction tool is lowered to each position;

[0015] The vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position is determined according to the stress distribution of the target drill string when the vibration reduction tool is lowered to each position.

[0016] In one embodiment, selecting the optimal running position of the vibration reduction tool from each of the positions according to the full-well section vibration intensity of the target drill string when the vibration reduction tool is run into each of the positions comprises:

[0017] The lowest full-well section vibration intensity is selected from the full-well section vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, and the position corresponding to the lowest full-well section vibration intensity is determined as the optimal lowering position of the vibration reduction tool.

[0018] In one embodiment, the mass matrix is ​​composed of the masses of multiple concentrated mass blocks corresponding to the target drill string, the stiffness matrix is ​​composed of the connection stiffness between adjacent concentrated mass blocks, the structural damping matrix is ​​based on the structural damping between adjacent concentrated mass blocks, the drilling fluid damping effect matrix is ​​composed of the mud damping coefficients of each of the concentrated mass blocks, the velocity vector is composed of the velocity of each of the concentrated mass blocks, and the acceleration vector is composed of the acceleration of each of the concentrated mass blocks.

[0019] In one embodiment, during the stage where the drill bit contacts the bottom of the well, the pre-built longitudinal vibration model is:

[0020]

[0021]

[0022] Where [M] represents the sub-mass matrix consisting of the elements of the first N-1 rows and first N-1 columns of the mass matrix, represents a vector consisting of the first N-1 elements of the acceleration vector, [C] represents the substructure damping matrix consisting of the first N-1 rows and first N-1 columns of the structural damping matrix, represents the vector composed of the first N-1 elements of the velocity vector, u represents the vector composed of the first N-1 elements of the displacement vector, F represents the load vector, P represents the hook load, and m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, c N-1 represents the structural damping between the N-1th concentrated mass block and the Nth concentrated mass block, represents the velocity of the Nth concentrated mass block, k N-1 represents the connection stiffness between the N-1th concentrated mass block and the Nth concentrated mass block, u b represents the displacement of the Nth concentrated mass block.

[0023] In one embodiment, in the stage where the drill bit is not in contact with the bottom of the well, the pre-built longitudinal vibration model is:

[0024]

[0025] F=[-P+m 1 gm 2 gm 3 g……m N-1 gm b g b ] T

[0026] Where [M] represents the mass matrix, represents the acceleration vector, [C] represents the structural damping matrix, represents the velocity vector, u represents the displacement vector, F represents the load vector, P represents the hook load, m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, P b Indicates drilling pressure.

[0027] In one embodiment, the moment of inertia matrix is ​​composed of the moments of inertia of multiple concentrated mass blocks corresponding to the target drill string, the torsional stiffness matrix is ​​composed of the shear stiffness between adjacent concentrated mass blocks, the torsional structural damping matrix is ​​composed of the shear damping between adjacent concentrated mass blocks, the torsional drilling fluid damping matrix is ​​composed of the torsional drilling fluid damping of each of the concentrated mass blocks, the rotational acceleration vector is composed of the rotational acceleration of each of the concentrated mass blocks, and the rotational speed vector is composed of the rotational speed of each of the concentrated mass blocks.

[0028] In one embodiment, the pre-built torsional vibration model is:

[0029]

[0030]

[0031] Where [J] represents the moment of inertia matrix, represents the rotation acceleration vector, [C τ ] represents the torsional structure damping matrix, [α τ ] represents the torsional drilling fluid damping matrix, [K τ ] represents the torsional stiffness matrix, represents the rotation speed vector, θ represents the torsion angle vector, k 1 τ represents the shear stiffness between the first concentrated mass block and the second concentrated mass block, c 1 τ represents the shear damping between the first concentrated mass block and the second concentrated mass block, ω represents the ground speed, t represents the time, T b Indicates the drill torque.

[0032] In a second aspect, the present application provides a drill string vibration reduction device, comprising:

[0033] An acquisition module, used to acquire longitudinal vibration data and torsional vibration data corresponding to a target drill string when a vibration reduction tool is lowered into a plurality of positions of the target drill string, the longitudinal vibration data including: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector, and the torsional vibration data including: moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix;

[0034] A determination module, for applying a pre-built longitudinal vibration model, a pre-built torsional vibration model, longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions, to determine the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to the position;

[0035] The vibration reduction module is used to select the optimal running position of the vibration reduction tool from each of the positions according to the full-well vibration intensity of the target drill string when the vibration reduction tool is run into each of the positions, and the vibration reduction tool is run into the optimal running position to complete the vibration reduction process of the target drill string.

[0036] In one embodiment, the determining module includes:

[0037] a displacement vector determination unit, for applying a pre-constructed longitudinal vibration model and longitudinal vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions, to determine a displacement vector corresponding to the target drill string when the vibration reduction tool is lowered to the position;

[0038] a torsional angle vector determining unit, configured to determine a torsional angle vector of the target drill string when the vibration reduction tool is lowered to the position based on a pre-constructed torsional vibration model and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each position;

[0039] A stress distribution determination unit is used to determine the stress distribution of the target drill string when the vibration reduction tool is lowered to each position according to the displacement vector and the torsion angle vector corresponding to the target drill string when the vibration reduction tool is lowered to the position;

[0040] The vibration intensity determination unit is used to determine the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each position according to the stress distribution of the target drill string when the vibration reduction tool is lowered to the position.

[0041] In one embodiment, the vibration reduction module comprises:

[0042] The optimal running position determination unit is used to select the lowest full-well section vibration intensity from the full-well section vibration intensity when the target drill string is run into the vibration reduction tool at each of the positions, and determine the position corresponding to the lowest full-well section vibration intensity as the optimal running position of the vibration reduction tool.

[0043] In one embodiment, the mass matrix is ​​composed of the masses of multiple concentrated mass blocks corresponding to the target drill string, the stiffness matrix is ​​composed of the connection stiffness between adjacent concentrated mass blocks, the structural damping matrix is ​​based on the structural damping between adjacent concentrated mass blocks, the drilling fluid damping effect matrix is ​​composed of the mud damping coefficients of each of the concentrated mass blocks, the velocity vector is composed of the velocity of each of the concentrated mass blocks, and the acceleration vector is composed of the acceleration of each of the concentrated mass blocks.

[0044] In one embodiment, during the stage where the drill bit contacts the bottom of the well, the pre-built longitudinal vibration model is:

[0045]

[0046]

[0047] Where [M] represents the sub-mass matrix consisting of the elements of the first N-1 rows and first N-1 columns of the mass matrix, represents a vector consisting of the first N-1 elements of the acceleration vector, [C] represents the substructure damping matrix consisting of the first N-1 rows and first N-1 columns of the structural damping matrix, represents the vector composed of the first N-1 elements of the velocity vector, u represents the vector composed of the first N-1 elements of the displacement vector, F represents the load vector, P represents the hook load, and m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, c N-1 represents the structural damping between the N-1th concentrated mass block and the Nth concentrated mass block, represents the velocity of the Nth concentrated mass block, k N-1 represents the connection stiffness between the N-1th concentrated mass block and the Nth concentrated mass block, u b represents the displacement of the Nth concentrated mass block.

[0048] In one embodiment, in the stage where the drill bit is not in contact with the bottom of the well, the pre-built longitudinal vibration model is:

[0049]

[0050] F=[-P+m 1 gm 2 gm 3 g……m N-1 gm b g b ] T

[0051] Where [M] represents the mass matrix, represents the acceleration vector, [C] represents the structural damping matrix, represents the velocity vector, u represents the displacement vector, F represents the load vector, P represents the hook load, m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, P b Indicates drilling pressure.

[0052] In one embodiment, the moment of inertia matrix is ​​composed of the moments of inertia of multiple concentrated mass blocks corresponding to the target drill string, the torsional stiffness matrix is ​​composed of the shear stiffness between adjacent concentrated mass blocks, the torsional structural damping matrix is ​​composed of the shear damping between adjacent concentrated mass blocks, the torsional drilling fluid damping matrix is ​​composed of the torsional drilling fluid damping of each of the concentrated mass blocks, the rotational acceleration vector is composed of the rotational acceleration of each of the concentrated mass blocks, and the rotational speed vector is composed of the rotational speed of each of the concentrated mass blocks.

[0053] In one embodiment, the pre-built torsional vibration model is:

[0054]

[0055] T=[k 1τ ωt+c 1τ ω0……0-T b ] T

[0056] Where [J] represents the moment of inertia matrix, represents the rotation acceleration vector, [C τ ] represents the torsional structure damping matrix, [α τ ] represents the torsional drilling fluid damping matrix, [K τ ] represents the torsional stiffness matrix, represents the rotation speed vector, θ represents the torsion angle vector, k 1 τ represents the shear stiffness between the first concentrated mass block and the second concentrated mass block, c 1 τ represents the shear damping between the first concentrated mass block and the second concentrated mass block, ω represents the ground speed, t represents the time, T b Indicates the drill torque.

[0057] In a third aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the drill string vibration reduction method is implemented when the processor executes the program.

[0058] In a fourth aspect, the present application provides a computer-readable storage medium having computer instructions stored thereon, wherein the instructions implement the drill string vibration reduction method when executed by a processor.

[0059] It can be seen from the above technical solution that the present application provides a drill string vibration reduction method and device. Among them, the method includes: obtaining longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to multiple positions of the target drill string, the longitudinal vibration data includes: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector, and the torsional vibration data includes: rotational acceleration vector, rotational speed vector, moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix; applying a pre-constructed longitudinal vibration model, a pre-constructed torsional vibration model, the longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions, Determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position; select the optimal lowering position of the vibration reduction tool from each of the positions according to the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to each of the positions; lower the vibration reduction tool to the optimal lowering position to complete the vibration reduction process of the target drill string, thereby improving the reliability of the lowering position of the vibration reduction tool, and further improving the vibration reduction effect of the drill string; specifically, not only the longitudinal vibration of the drill string can be considered, but also the torsional vibration of the drill string can be considered at the same time, and the vibration intensity of the entire well section of the drill string can be comprehensively evaluated, thereby improving the drilling efficiency and safety of deep wells and ultra-deep wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present application 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1 is a first flow chart of the drill string vibration reduction method in an embodiment of the present application;

[0062] Figure 2 is a second flow chart of the drill string vibration reduction method in an embodiment of the present application;

[0063] Figure 3 is the force diagram of the i-th concentrated mass block in the application example of this application;

[0064] Figure 4 It is a flow chart of the drill string vibration reduction method in the application example of the present application;

[0065] Figure 5 is a schematic structural diagram of a drill string vibration reduction device in an embodiment of the present application;

[0066] Figure 6 is a schematic diagram of the structure of the determination module in the embodiment of the present application;

[0067] Figure 7 is a schematic structural diagram of a drill string vibration reduction system in an embodiment of the present application;

[0068] Figure 8 It is a schematic diagram of the structure of the vibration reduction tool in the application example of the present application;

[0069] Fig. 9 It is a schematic block diagram of the system structure of the electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0070] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0071] The vibration problem of drill string is particularly prominent during the actual drilling of deep wells and ultra-deep wells, which not only affects the construction efficiency of drilling, but also brings serious safety risks. Frequent and severe vibration leads to alternating stress of the drill string, which will cause fatigue fracture damage of the drill string, thereby increasing the construction cost and causing great economic losses. The existing method of reducing drill string vibration is to use shock absorbers to convert vibration energy into elastic potential energy and internal energy of hydraulic oil, or to release friction energy between springs in shock absorbers, which is not only a waste of energy, but also the heat generated will affect the performance of downhole tools.

[0072] Based on this, the embodiment of the present application proposes a drill string vibration reduction method and device, which can realize integrated deep well and ultra-deep well drill string vibration reduction, improve the drilling efficiency and safety of deep well and ultra-deep well, not only consider the longitudinal vibration of the drill string, but also consider the torsional vibration of the drill string at the same time, and can comprehensively evaluate the vibration intensity of the entire well section of the drill string.

[0073] The details are described through the following embodiments.

[0074] In order to improve the reliability of the lowering position of the vibration reduction tool and thus improve the effect of drill string vibration reduction, this embodiment provides a drill string vibration reduction method in which the execution subject is a drill string vibration reduction device, and the drill string vibration reduction device includes but is not limited to a server, such as Figure 1As shown, the method specifically includes the following contents:

[0075] Step 100: Obtain longitudinal vibration data and torsional vibration data corresponding to a target drill string when a vibration reduction tool is lowered into multiple positions of the target drill string, respectively. The longitudinal vibration data includes: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector; the torsional vibration data includes: rotational acceleration vector, rotational speed vector, moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix.

[0076] Specifically, multiple positions of the target drill string can be threaded connections of the drill pipe, and the positions can be pre-specified according to actual conditions. The drill string is equivalent to a series of discrete mass points connected by springs and damping, and the position of the discrete mass points is the concentrated mass block. The concentrated mass block is generally at the threaded connection of the drill pipe, and the drill string can be connected by a drill pipe of about 9 meters. The vibration reduction tool is also called a shock absorber, a shock absorber tool, and a bottom hole drill string vibration reduction and energy enhancement device, which can be an existing vibration reduction tool.

[0077] Specifically, the mass matrix may be composed of the masses of the multiple concentrated mass blocks corresponding to the target drill string, the stiffness matrix is ​​composed of the connection stiffness between adjacent concentrated mass blocks, the structural damping matrix is ​​composed based on the structural damping between adjacent concentrated mass blocks, the drilling fluid damping effect matrix is ​​composed of the mud damping coefficient of each of the concentrated mass blocks, the velocity vector is composed of the velocity of each of the concentrated mass blocks, and the acceleration vector is composed of the acceleration of each of the concentrated mass blocks. The moment of inertia matrix may be composed of the moment of inertia of the multiple concentrated mass blocks corresponding to the target drill string, the torsional stiffness matrix is ​​composed of the shear stiffness between adjacent concentrated mass blocks, the torsional structural damping matrix is ​​composed of the shear damping between adjacent concentrated mass blocks, the torsional drilling fluid damping matrix is ​​composed of the torsional drilling fluid damping of each of the concentrated mass blocks, the rotational acceleration vector is composed of the rotational acceleration of each of the concentrated mass blocks, and the rotational speed vector is composed of the rotational speed of each of the concentrated mass blocks.

[0078] Step 200: Apply a pre-constructed longitudinal vibration model, a pre-constructed torsional vibration model, and the longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions to determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position.

[0079] Step 300: According to the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, the optimal lowering position of the vibration reduction tool is selected from each of the positions, and the vibration reduction tool is lowered to the optimal lowering position to complete the vibration reduction process of the target drill string.

[0080] In order to improve the reliability of determining the vibration intensity of the entire well section, in one embodiment, Figure 2 As shown, step 200 includes:

[0081] Step 201: applying a pre-constructed longitudinal vibration model and longitudinal vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions, determine a displacement vector corresponding to the target drill string when the vibration reduction tool is lowered to the position.

[0082] Step 202: Based on a pre-constructed torsional vibration model and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions, determine a torsional angle vector of the target drill string when the vibration reduction tool is lowered to the position.

[0083] Step 203: Determine the stress distribution of the target drill string when the vibration reduction tool is lowered to each position according to the displacement vector and the torsion angle vector corresponding to the target drill string when the vibration reduction tool is lowered to the position.

[0084] Step 204: Determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to each of the positions according to the stress distribution of the target drill string when the vibration reduction tool is lowered to the position.

[0085] (i) During the contact stage between the drill bit and the bottom of the well, the pre-built longitudinal vibration model may be:

[0086]

[0087]

[0088] Where [M] represents the sub-mass matrix consisting of the elements of the first N-1 rows and first N-1 columns of the mass matrix, represents a vector consisting of the first N-1 elements of the acceleration vector, [C] represents the substructure damping matrix consisting of the first N-1 rows and first N-1 columns of the structural damping matrix, represents the vector composed of the first N-1 elements of the velocity vector, u represents the vector composed of the first N-1 elements of the displacement vector, F represents the load vector, P represents the hook load, and m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, c N-1represents the structural damping between the N-1th concentrated mass block and the Nth concentrated mass block, represents the velocity of the Nth concentrated mass block, k N-1 represents the connection stiffness between the N-1th concentrated mass block and the Nth concentrated mass block, u b Represents the displacement of the Nth concentrated mass block. When the drill bit is in contact with the bottom of the well, the displacement of the drill bit mass point, i.e., the displacement of the Nth concentrated mass block, can be equal to the fluctuation of the bottom of the well, and the velocity of the drill bit mass point, i.e., the velocity of the Nth concentrated mass block, can be equal to the rate of fluctuation of the bottom of the well; therefore, when the drill bit is in contact with the bottom of the well, only the pre-constructed longitudinal vibration model can be applied to solve the displacement of the first N-1 concentrated mass blocks to obtain the displacement vector.

[0089] (ii) When the drill bit is not in contact with the bottom of the well, the pre-built longitudinal vibration model may be:

[0090]

[0091] F=[-P+m 1 gm 2 gm 3 g……m N-1 gm b g b ] T

[0092] Where [M] represents the mass matrix, represents the acceleration vector, [C] represents the structural damping matrix, represents the velocity vector, u represents the displacement vector, F represents the load vector, P represents the hook load, m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, P b Indicates drilling pressure.

[0093] The mass matrix can be:

[0094]

[0095] Among them, m N-1 represents the mass of the N-1th concentrated mass block, m b represents the mass of the Nth concentrated mass block, which can be equivalent to the drill bit. The structural damping matrix can be:

[0096]

[0097] Among them, c N-1 represents the structural damping between the N-1th concentrated mass block and the Nth concentrated mass block. The drilling fluid damping effect matrix can be:

[0098]

[0099] Among them, α N-1 represents the mud damping coefficient of the N-1th concentrated mass block, α b represents the mud damping coefficient of the Nth concentrated mass block. The stiffness matrix can be:

[0100]

[0101] Among them, k N-1 represents the connection stiffness between the N-1th concentrated mass block and the Nth concentrated mass block.

[0102] The acceleration vector can be: represents the acceleration of the N-1th concentrated mass block, represents the acceleration of the Nth concentrated mass block.

[0103] The velocity vector can be: represents the velocity of the N-1th concentrated mass block, Represents the velocity of the Nth concentrated mass block.

[0104] The displacement vector can be: u = [u 1 u 2 u 3 ……u N-1 u b ] T ,u N-1 represents the displacement of the N-1th concentrated mass block, u b represents the displacement of the Nth concentrated mass block.

[0105] It can be understood that when the vibration reduction tool is lowered to any of the positions A, the current hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector of the target drill string can be input into the pre-constructed longitudinal vibration model to obtain the displacement of each concentrated mass block of the target drill string when the vibration reduction tool is lowered to position A.

[0106] When the drill bit is in contact with the bottom of the well, the corrected force on the drill bit, the load vector at this time can be expressed as: The mass matrix, stiffness matrix, structural damping matrix, and drilling fluid damping effect matrix all take the first (N-1) rows and columns, and the velocity vector and acceleration vector all take the first (N-1) elements and substitute them into the longitudinal vibration model. At this time, the displacement vector is: u = [u 1 u 2 u 3 ……uN-2 u N-1 ] T Among them, c N-1 represents the structural damping between the N-1th concentrated mass block and the Nth concentrated mass block, represents the velocity of the Nth concentrated mass block, k N-1 represents the connection stiffness between the N-1th concentrated mass block and the Nth concentrated mass block, u b represents the displacement of the Nth concentrated mass block.

[0107] (III) The pre-constructed torsional vibration model may be:

[0108]

[0109] T=[k 1τ ωt+c 1τ ω0……0-T b ] T

[0110] Where [J] represents the moment of inertia matrix, represents the rotation acceleration vector, [C τ ] represents the torsional structure damping matrix, [α τ ] represents the torsional drilling fluid damping matrix, [K τ ] represents the torsional stiffness matrix, represents the rotation speed vector, θ represents the torsion angle vector, k 1 τ represents the shear stiffness between the first concentrated mass block and the second concentrated mass block, c 1 τ represents the shear damping between the first concentrated mass block and the second concentrated mass block, ω represents the ground speed, t represents the time, T b Indicates the drill torque.

[0111] Among them, the moment of inertia matrix can be:

[0112]

[0113] Among them, J N-1 represents the moment of inertia of the N-1th concentrated mass block, J b represents the moment of inertia of the Nth concentrated mass block. The torsional structure damping matrix can be:

[0114]

[0115] Among them, c N-1 τ represents the shear damping between the N-1th concentrated mass block and the Nth concentrated mass block. The torsional drilling fluid damping matrix can be:

[0116]

[0117] Among them, α N-1 τ represents the torsional drilling fluid damping of the N-1th concentrated mass block, α b τ represents the torsional drilling fluid damping of the Nth concentrated mass block. The torsional stiffness matrix can be:

[0118]

[0119] Among them, k N-1 τ represents the shear stiffness between the N-1th concentrated mass block and the Nth concentrated mass block.

[0120] The rotational acceleration vector can be: represents the rotational acceleration of the N-1th concentrated mass block, represents the rotational acceleration of the Nth concentrated mass block.

[0121] The speed vector can be represents the rotation speed of the N-1th concentrated mass block, Represents the rotation speed of the Nth concentrated mass block.

[0122] The torsion angle vector can be: θ = [θ 2 θ 3 … … θ N-1 θ b ] T ,θ N-1 represents the torsion angle of the N-1th concentrated mass block, θ b represents the torsion angle of the Nth concentrated mass block.

[0123] In order to further improve the reliability of determining the position where the vibration reduction tool is lowered, in one embodiment of the present application, the optimal lowering position of the vibration reduction tool is selected from each of the positions according to the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions in step 300, including: selecting the full-well vibration intensity with the lowest value from the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, and determining the position corresponding to the full-well vibration intensity with the lowest value as the optimal lowering position of the vibration reduction tool.

[0124] In order to further illustrate the present solution, the present application provides an application example of a drill string vibration reduction method, which is specifically described as follows:

[0125] Step 1: Longitudinal vibration model construction:

[0126] A dynamic equation that conforms to Newton's second law is established at each concentrated mass block, and the first concentrated mass block satisfies the following equilibrium equation:

[0127]

[0128] Among them, m 1 is the mass of the first concentrated mass block, k 1 is the connection stiffness between the first and second concentrated mass blocks, c 1 is the structural damping of the pipe string between the first and second concentrated mass blocks, α 1 is the mud damping coefficient of the first concentrated mass block pipe string section, P is the hook load, g is the gravity acceleration, u 2 and u 1 are the displacements of the first and second concentrated mass blocks, and are the velocities of the first and second concentrated masses, is the acceleration of the first concentrated mass.

[0129] like Figure 3 As shown, the force analysis of the ith concentrated mass block is performed. It can be seen that the ith concentrated mass block satisfies the following equilibrium equation:

[0130]

[0131] In the above formula, i=2,3,4,…,N-1.

[0132] The Nth concentrated mass block satisfies the following dynamic equation:

[0133]

[0134] Among them, P b u is the force exerted by the bottom hole drilling fluid pressure on the bottom of the drill string, and its value is approximately the buoyancy of the entire string immersed in the drilling fluid; b is the displacement of the drill bit node; α b is the drilling fluid damping on the drill bit node; f wob It is the axial force of the rock on the drill bit. According to Newton's third law, it reflects the instantaneous drilling pressure of the drill bit on the rock surface at the bottom of the well. Its value is unknown. The Nth concentrated mass block can be equivalent to the drill bit. After combining equations (1-2) to (1-3), we can get N second-order ordinary differential equations (1-4):

[0135]

[0136] That is to say, the dynamic equation at each concentrated mass block can be expanded to construct a matrix equation to obtain N second-order ordinary differential equations. The N second-order ordinary differential equations can be equivalent to the matrix form of the dynamic equation of axial vibration, or equivalent to the above-mentioned longitudinal vibration model.

[0137] When the drill bit jumps off the bottom of the well, the above equation is an N×N matrix equation, and the coefficient matrix is ​​represented by the following equations (1-5 to 1-8). Among them, the mass matrix of axial vibration is:

[0138]

[0139] The stiffness matrix is ​​expressed as:

[0140]

[0141] The structural damping matrix is ​​expressed as:

[0142]

[0143] The damping effect of drilling fluid is expressed as:

[0144]

[0145] F is the load vector, expressed as:

[0146] F=[-P+m 1 gm 2 gm 3 g … … m N-1 gm b g b ] T (1-9)

[0147] u is the displacement vector, expressed as:

[0148] u=[u 1 u 2 u 3 … … u N-1 u b ] T (1-10)

[0149] During the contact stage between the drill bit and the bottom of the well, the concentrated mass block of the drill bit satisfies the geometric relationship of the above equation (1-4). Therefore, the dynamic equation of the string is expressed as a (N-1)×(N-1) matrix equation. Its form is as shown in the above equation (1-4), and the coefficient matrix is ​​the (N-1) rows and columns of the above equations (1-5 to 1-8). At this time, the load vector is expressed as:

[0150]

[0151] At this time, the displacement vector at the concentrated mass block of the pipe string is expressed as:

[0152] u=[u 1 u 2 u 3 … … u N-2 u N-1 ] T (1-12)

[0153] Step 2: Construct a torsional vibration model.

[0154] When analyzing torsional vibration, the pipe string is discretized into N mass points with concentrated rotational inertia. Since the boundary condition of the top boundary is assumed to be a constant speed, the motion state of the first concentrated mass block is determined, and the speed of the first concentrated mass block is a constant, so there is no need to establish the dynamic equilibrium equation of the first concentrated mass block. Therefore, the vibration equation of torsional vibration will be used to solve the torsional deformation law of N-1 concentrated mass blocks. Similar to the solution of the dynamic equilibrium equation of axial vibration, the dynamic equilibrium equation of torsional vibration at the node is obtained by solving the torque through Newton's second law:

[0155]

[0156] Among them, J i represents the moment of inertia of the ith concentrated mass block, θ i represents the rotation speed of the ith concentrated mass block, k i τ represents the shear stiffness between the ith concentrated mass block and the i+1th concentrated mass block, c i τ represents the shear damping between the i-th concentrated mass block and the i+1-th concentrated mass block, i=2,3,4,…,N-1. The dynamic equation of the drill bit, i.e. the N-th concentrated mass block, is expressed as:

[0157]

[0158] Therefore, the equilibrium equation of the torsional vibration of the system is written in matrix form as follows:

[0159]

[0160] in,

[0161] θ=[θ 2 θ 3 … … θ N-1 θ b ] T (1-16)

[0162] T=[k 1 τ ωt+c1 τ ω 0 … … 0 -T b ] T (1-17)

[0163] Where ω is the ground speed, that is, the speed of the first concentrated mass block. The coefficient matrix of the matrix equation (1-15) is expressed by the following equations (1-18 to 1-21). The moment of inertia matrix is ​​expressed as:

[0164]

[0165] The torsional stiffness matrix is ​​expressed as:

[0166]

[0167] The torsional structural damping matrix is ​​expressed as:

[0168]

[0169] The torsional drilling fluid damping matrix is ​​expressed as:

[0170]

[0171] Step 3: Determine the optimal position for lowering the vibration reduction tool to complete drill string vibration reduction.

[0172] Specifically, the longitudinal vibration balance equation (1-4) and the torsional vibration balance equation (1-15) are in the form of second-order ordinary differential equations with matrix coefficients, and the coefficient matrix is ​​N×N. Given the initial conditions and load conditions, they can be obtained by numerical integration algorithms. The results directly obtained are the axial displacement and torsion angle at each concentrated mass block position of the drill string. The stress distribution of the drill string can be obtained by post-processing the direct results, and then the strength can be evaluated. The vibration reduction tool is installed at different positions to repeat the above drill string dynamics analysis and comparison to obtain the optimal lowering position of the vibration reduction tool.

[0173] In order to further illustrate the present invention, the present application provides an application example of a drill string vibration reduction method, such as Figure 4 The method is described in detail as follows:

[0174] Initialize / Update i The moment shaft torsion data, check t i Axial vibration status at the moment, judge contact / jump off? If contact, check t i The torsional vibration state at the moment, determine whether it is slipping or sticking? If it is slipping, calculate the torsional vibration state: take t i Calculate the sliding friction torque of the drill bit at the instant speed; if it is sticky, calculate the torsional vibration state: fix the drill bit node; check t i+1The torsional vibration state at time t i Is the state consistent at the moment? If not, correct it: use t i+1 The torsional vibration is recalculated at the moment state. There is a change in the torsional vibration state at the current time step. If it jumps off, the torsional vibration state is calculated: zero torque sliding friction of the drill bit.

[0175] In determining t i+1 The torsional vibration state at time t i The state is consistent at all times, and the drill bit has zero torque sliding friction. i+1 After recalculating the torsional vibration, check t i Torsional vibration state at all times, judge contact / jump off? If it is jump off, calculate the axial vibration model: drill bit rock no contact, if it is contact, calculate the axial vibration model: drill bit rock motion coupling; check t i+1 The axial vibration state at time t i Is the state consistent at each moment? If so, determine whether the simulation is over. If t i+1 The axial vibration state at time t i If the state at the moment is inconsistent, correction is made: i+1 The axial vibration is recalculated at the current time step. If there is a change in the axial vibration state at the current time step, it is determined whether the simulation is finished. The functions implemented by the axial vibration model are equivalent to those implemented by the longitudinal vibration model described above.

[0176] From the software level, in order to improve the reliability of the lowering position of the vibration reduction tool and thus improve the effect of drill string vibration reduction, the present application provides an embodiment of a drill string vibration reduction device for realizing all or part of the contents of the drill string vibration reduction method, see Figure 5 The drill string vibration reduction device specifically includes the following contents:

[0177] The acquisition module 01 is used to obtain longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to multiple positions of the target drill string, respectively. The longitudinal vibration data includes: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector; the torsional vibration data includes: moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix.

[0178] The determination module 02 is used to apply a pre-built longitudinal vibration model, a pre-built torsional vibration model, and the longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions to determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position.

[0179] The vibration reduction module 03 is used to select the optimal running position of the vibration reduction tool from each of the positions according to the full-well vibration intensity of the target drill string when the vibration reduction tool is run into each of the positions, and the vibration reduction tool is run into the optimal running position to complete the vibration reduction process of the target drill string.

[0180] like Figure 6 As shown, in one embodiment, the determining module includes:

[0181] The displacement vector determination unit 021 is used to apply a pre-constructed longitudinal vibration model and longitudinal vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions to determine the displacement vector corresponding to the target drill string when the vibration reduction tool is lowered to the position.

[0182] The torsional angle vector determination unit 022 is used to determine the torsional angle vector of the target drill string when the vibration reduction tool is lowered to the position based on a pre-constructed torsional vibration model and the torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each position.

[0183] The stress distribution determination unit 023 is used to determine the stress distribution of the target drill string when the vibration reduction tool is lowered to each position according to the displacement vector and the torsion angle vector corresponding to the target drill string when the vibration reduction tool is lowered to the position.

[0184] The vibration intensity determination unit 024 is used to determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to each position according to the stress distribution of the target drill string when the vibration reduction tool is lowered to the position.

[0185] In one embodiment, the vibration reduction module comprises:

[0186] The optimal running position determination unit is used to select the lowest full-well section vibration intensity from the full-well section vibration intensity when the target drill string is run into the vibration reduction tool at each of the positions, and determine the position corresponding to the lowest full-well section vibration intensity as the optimal running position of the vibration reduction tool.

[0187] In one embodiment, the mass matrix is ​​composed of the masses of multiple concentrated mass blocks corresponding to the target drill string, the stiffness matrix is ​​composed of the connection stiffness between adjacent concentrated mass blocks, the structural damping matrix is ​​based on the structural damping between adjacent concentrated mass blocks, the drilling fluid damping effect matrix is ​​composed of the mud damping coefficients of each of the concentrated mass blocks, the velocity vector is composed of the velocity of each of the concentrated mass blocks, and the acceleration vector is composed of the acceleration of each of the concentrated mass blocks.

[0188] In one embodiment, during the stage where the drill bit contacts the bottom of the well, the pre-built longitudinal vibration model is:

[0189]

[0190]

[0191] Where [M] represents the sub-mass matrix consisting of the elements of the first N-1 rows and first N-1 columns of the mass matrix, represents a vector consisting of the first N-1 elements of the acceleration vector, [C] represents the substructure damping matrix consisting of the first N-1 rows and first N-1 columns of the structural damping matrix, represents the vector composed of the first N-1 elements of the velocity vector, u represents the vector composed of the first N-1 elements of the displacement vector, F represents the load vector, P represents the hook load, and m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, c N-1 represents the structural damping between the N-1th concentrated mass block and the Nth concentrated mass block, represents the velocity of the Nth concentrated mass block, k N-1 represents the connection stiffness between the N-1th concentrated mass block and the Nth concentrated mass block, u b represents the displacement of the Nth concentrated mass block.

[0192] In one embodiment, in the stage where the drill bit is not in contact with the bottom of the well, the pre-built longitudinal vibration model is:

[0193]

[0194] F=[-P+m 1 gm 2 gm 3 g……m N-1 gm b g b ] T

[0195] Where [M] represents the mass matrix, represents the acceleration vector, [C] represents the structural damping matrix, represents the velocity vector, u represents the displacement vector, F represents the load vector, P represents the hook load, m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, P b Indicates drilling pressure.

[0196] In one embodiment, the moment of inertia matrix is ​​composed of the moments of inertia of multiple concentrated mass blocks corresponding to the target drill string, the torsional stiffness matrix is ​​composed of the shear stiffness between adjacent concentrated mass blocks, the torsional structural damping matrix is ​​composed of the shear damping between adjacent concentrated mass blocks, the torsional drilling fluid damping matrix is ​​composed of the torsional drilling fluid damping of each of the concentrated mass blocks, the rotational acceleration vector is composed of the rotational acceleration of each of the concentrated mass blocks, and the rotational speed vector is composed of the rotational speed of each of the concentrated mass blocks.

[0197] In one embodiment, the pre-built torsional vibration model is:

[0198]

[0199] T=[k 1 τ ωt+c 1 τ ω 0 … … 0 -T b ] T

[0200] Where [J] represents the moment of inertia matrix, represents the rotation acceleration vector, [C τ ] represents the torsional structure damping matrix, [α τ ] represents the torsional drilling fluid damping matrix, [K τ ] represents the torsional stiffness matrix, represents the rotation speed vector, θ represents the torsion angle vector, k 1 τ represents the shear stiffness between the first concentrated mass block and the second concentrated mass block, c 1 τ represents the shear damping between the first concentrated mass block and the second concentrated mass block, ω represents the ground speed, t represents the time, T b Indicates the drill torque.

[0201] The embodiment of the drill string vibration reduction device provided in this specification can be specifically used to execute the processing flow of the embodiment of the above-mentioned drill string vibration reduction method. Its functions are not repeated here, and reference can be made to the detailed description of the embodiment of the above-mentioned drill string vibration reduction method.

[0202] In order to further illustrate the present solution, the present application provides an application example of a drill string vibration reduction system. In this application example, Figure 7As shown, the drill string vibration reduction system includes: a logging instrument 102, a logging instrument docking device 103 and the drill string vibration reduction device, and the drill string vibration reduction device may include: a drill string vibration prediction module 101, a central processing computer 104 and a client computer 105; the drill string vibration prediction module may be a server. The drill string vibration prediction module, the central processing computer and the client computer are connected in sequence, and the logging instrument, the logging instrument docking device and the central processing computer are connected in sequence.

[0203] Among them, the drill string vibration prediction module can be used to input drilling engineering information, calculate the vibration distribution of the drill string in the entire well section, design the position of the vibration reduction and energy enhancement tool, and transmit it to the central processing computer. The logging instrument can be connected to the central processing computer to conduct real-time drill string vibration risk assessment, specify the vibration reduction plan, and compare it with the predicted drill string vibration situation to optimize the position of the vibration reduction tool. The central processing computer can transmit the generated drill string vibration reduction plan and tool installation plan to the client computer in real time, and the drilling site tool construction plan can be used to perform drill string vibration reduction operations.

[0204] Furthermore, if Figure 8 As shown, the present application also provides an application example of a vibration reduction tool, which can be applied to the drill string vibration reduction method. In this application example, the vibration reduction tool includes: a tool upper joint 1; a core shaft 2; an upper sealing assembly pressure cover 3; an upper sealing assembly 4; a spline outer cylinder 5; a limit body 6; an outer sleeve with a protective cylinder 7; a spring 8; a tool center joint 9; a lower sealing assembly 10; a plunger head 11; a sliding seal assembly 12; a control one-way valve 13; a plunger jacket 14; a plunger cylinder sleeve 15; a drill bit 16; and a special jet channel 17 for high-pressure fluid.

[0205] The vibration of the drill string causes fluctuations in drilling pressure. The upper joint 1 of the tool is connected to the upper drilling tool assembly. The mandrel 2 is used to provide the required strength of the main body. The spline outer cylinder 5 is used to connect the upper vibration reduction module and the lower booster module of the device. The spring 8 is used to absorb the vibration energy of the upper drill string. The upper sealing assembly gland 3 and the upper sealing assembly 4 are used to seal the drilling fluid inside the device to maintain pressure. The upper part of the plunger head 11 is connected to the mandrel 2, which can realize up and down piston-like movement and compress the drilling fluid in the plunger cylinder sleeve 15. The high-pressure drilling fluid is connected to the drill bit 16 through the high-pressure jet channel 17 and directly acts on the bottom of the well to achieve downhole energy enhancement. The high-pressure jet channel 17 directly connected to the vibration reduction tool and the drill bit nozzle has the following functions: the drilling fluid jet energy increased by the vibration reduction tool is usually 4-8MPa, which cannot effectively break rocks. If the energy is concentrated through the high-pressure jet channel 17 and directly acts on the drill bit, the jet energy can reach 80MPa, which can directly break rocks and greatly improve the rock breaking efficiency of deep ultra-hard formations.

[0206] In this application example, the drill string vibration reduction tool uses drill string vibration as an energy source to drive the plunger of the tool's plunger pump to move up and down, thereby increasing the drill bit jet pressure. The tool is directly connected to the drill bit, which reduces drill string vibration and protects the drill bit while increasing the bottom hole jet pressure, improving the bottom hole cuttings cleaning effect, and achieving downhole energy enhancement and rock breaking. It can solve the problems of high downhole vibration intensity, insufficient bottom hole hydraulic energy, and insufficient bottom hole cleaning. The vibration reduction tool converts drill string vibration energy into drilling fluid jet energy, turning harm into benefit, and achieving speed and efficiency improvement in deep and ultra-deep wells.

[0207] Fig. 9 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as Fig. 9 As shown, the electronic device includes: a memory 901, a processor 902, and a computer program stored in the memory 901 and executable on the processor 902. When the processor 902 executes the computer program, the following method is implemented:

[0208] Acquire longitudinal vibration data and torsional vibration data corresponding to a target drill string when a vibration reduction tool is lowered into a plurality of positions of the target drill string, respectively, wherein the longitudinal vibration data includes: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector, and the torsional vibration data includes: rotational acceleration vector, rotational speed vector, moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix;

[0209] Determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position by using a pre-constructed longitudinal vibration model, a pre-constructed torsional vibration model, and longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions;

[0210] According to the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, the optimal lowering position of the vibration reduction tool is selected from each of the positions, and the vibration reduction tool is lowered to the optimal lowering position to complete the vibration reduction process of the target drill string.

[0211] This embodiment discloses a computer program product, the computer program product including a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0212] Acquire longitudinal vibration data and torsional vibration data corresponding to a target drill string when a vibration reduction tool is lowered into a plurality of positions of the target drill string, respectively, wherein the longitudinal vibration data includes: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector, and the torsional vibration data includes: rotational acceleration vector, rotational speed vector, moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix;

[0213] Determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position by using a pre-constructed longitudinal vibration model, a pre-constructed torsional vibration model, and longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions;

[0214] According to the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, the optimal lowering position of the vibration reduction tool is selected from each of the positions, and the vibration reduction tool is lowered to the optimal lowering position to complete the vibration reduction process of the target drill string.

[0215] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0216] Acquire longitudinal vibration data and torsional vibration data corresponding to a target drill string when a vibration reduction tool is lowered into a plurality of positions of the target drill string, respectively, wherein the longitudinal vibration data includes: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector, and the torsional vibration data includes: rotational acceleration vector, rotational speed vector, moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix;

[0217] Determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position by using a pre-constructed longitudinal vibration model, a pre-constructed torsional vibration model, and longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions;

[0218] According to the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, the optimal lowering position of the vibration reduction tool is selected from each of the positions, and the vibration reduction tool is lowered to the optimal lowering position to complete the vibration reduction process of the target drill string.

[0219] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0220] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0221] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0222] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0223] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0224] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drill string vibration reduction method, characterized in that: include: Acquire longitudinal vibration data and torsional vibration data corresponding to a target drill string when a vibration reduction tool is lowered into a plurality of positions of the target drill string, respectively, wherein the longitudinal vibration data includes: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector, and the torsional vibration data includes: rotational acceleration vector, rotational speed vector, moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix; Determine the vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position by using a pre-constructed longitudinal vibration model, a pre-constructed torsional vibration model, and longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions; According to the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, the optimal lowering position of the vibration reduction tool is selected from each of the positions, and the vibration reduction tool is lowered to the optimal lowering position to complete the vibration reduction process of the target drill string.

2. The drill string vibration reduction method according to claim 1, characterized in that: The method uses a pre-built longitudinal vibration model, a pre-built torsional vibration model, and longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions to determine the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to the position, including: Determine the displacement vector corresponding to the target drill string when the vibration reduction tool is lowered to the position by applying a pre-constructed longitudinal vibration model and longitudinal vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each position; Determine the torsional angle vector of the target drill string when the vibration reduction tool is lowered to the position based on a pre-constructed torsional vibration model and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each position; Determine the stress distribution of the target drill string when the vibration reduction tool is lowered to the position according to the displacement vector and the torsion angle vector corresponding to the target drill string when the vibration reduction tool is lowered to each position; The vibration intensity of the entire well section of the target drill string when the vibration reduction tool is lowered to the position is determined according to the stress distribution of the target drill string when the vibration reduction tool is lowered to each position.

3. The drill string vibration reduction method according to claim 1, characterized in that: The step of selecting the optimal running position of the vibration reduction tool from each of the positions according to the full-well section vibration intensity of the target drill string when the vibration reduction tool is run into each of the positions comprises: The lowest full-well section vibration intensity is selected from the full-well section vibration intensity of the target drill string when the vibration reduction tool is lowered to each of the positions, and the position corresponding to the lowest full-well section vibration intensity is determined as the optimal lowering position of the vibration reduction tool.

4. The drill string vibration reduction method according to claim 1, characterized in that: The mass matrix is ​​composed of the masses of multiple concentrated mass blocks corresponding to the target drill string, the stiffness matrix is ​​composed of the connection stiffness between adjacent concentrated mass blocks, the structural damping matrix is ​​based on the structural damping between adjacent concentrated mass blocks, the drilling fluid damping effect matrix is ​​composed of the mud damping coefficients of each of the concentrated mass blocks, the velocity vector is composed of the velocity of each of the concentrated mass blocks, and the acceleration vector is composed of the acceleration of each of the concentrated mass blocks.

5. The drill string vibration reduction method according to claim 4, characterized in that: During the drill bit contact with the bottom of the well, the pre-built longitudinal vibration model is: Where [M] represents the sub-mass matrix consisting of the elements of the first N-1 rows and first N-1 columns of the mass matrix, represents a vector consisting of the first N-1 elements of the acceleration vector, [C] represents the substructure damping matrix consisting of the first N-1 rows and first N-1 columns of the structural damping matrix, represents the vector composed of the first N-1 elements of the velocity vector, u represents the vector composed of the first N-1 elements of the displacement vector, F represents the load vector, P represents the hook load, and m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, c N-1 represents the structural damping between the N-1th concentrated mass block and the Nth concentrated mass block, represents the velocity of the Nth concentrated mass block, k N-1 represents the connection stiffness between the N-1th concentrated mass block and the Nth concentrated mass block, u b represents the displacement of the Nth concentrated mass block.

6. The drill string vibration reduction method according to claim 4, characterized in that: In the stage where the drill bit is not in contact with the bottom of the well, the pre-built longitudinal vibration model is: F=[-P+m1g m2g m3g……m N-1 g m b g-P b ] T Where [M] represents the mass matrix, represents the acceleration vector, [C] represents the structural damping matrix, represents the velocity vector, u represents the displacement vector, F represents the load vector, P represents the hook load, m N-2 represents the mass of the N-2th concentrated mass block, g represents the gravitational acceleration, P b Indicates drilling pressure.

7. The drill string vibration reduction method according to claim 1, characterized in that: The moment of inertia matrix is ​​composed of the moments of inertia of multiple concentrated mass blocks corresponding to the target drill string, the torsional stiffness matrix is ​​composed of the shear stiffness between adjacent concentrated mass blocks, the torsional structural damping matrix is ​​composed of the shear damping between adjacent concentrated mass blocks, the torsional drilling fluid damping matrix is ​​composed of the torsional drilling fluid damping of each of the concentrated mass blocks, the rotational acceleration vector is composed of the rotational acceleration of each of the concentrated mass blocks, and the rotational speed vector is composed of the rotational speed of each of the concentrated mass blocks.

8. The drill string vibration reduction method according to claim 7, characterized in that: The pre-built torsional vibration model is: T=[k 1τ ωt+c 1τ ω0……0-T b ] T Where [J] represents the moment of inertia matrix, represents the rotation acceleration vector, [C τ ] represents the torsional structure damping matrix, [α τ ] represents the torsional drilling fluid damping matrix, [K τ ] represents the torsional stiffness matrix, represents the rotation speed vector, θ represents the torsion angle vector, k1 τ represents the shear stiffness between the first concentrated mass block and the second concentrated mass block, c1 τ represents the shear damping between the first concentrated mass block and the second concentrated mass block, ω represents the ground speed, t represents the time, T b Indicates the drill torque.

9. A drill string vibration reduction device, characterized in that: include: An acquisition module, used to acquire longitudinal vibration data and torsional vibration data corresponding to a target drill string when a vibration reduction tool is lowered into a plurality of positions of the target drill string, the longitudinal vibration data including: hook load, mass matrix, stiffness matrix, structural damping matrix, drilling fluid damping effect matrix, velocity vector and acceleration vector, and the torsional vibration data including: moment of inertia matrix, torsional stiffness matrix, torsional structural damping matrix and torsional drilling fluid damping matrix; A determination module, for applying a pre-built longitudinal vibration model, a pre-built torsional vibration model, longitudinal vibration data and torsional vibration data corresponding to the target drill string when the vibration reduction tool is lowered to each of the positions, to determine the full-well vibration intensity of the target drill string when the vibration reduction tool is lowered to the position; The vibration reduction module is used to select the optimal running position of the vibration reduction tool from each of the positions according to the full-well vibration intensity of the target drill string when the vibration reduction tool is run into each of the positions, and the vibration reduction tool is run into the optimal running position to complete the vibration reduction process of the target drill string.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the drill string vibration reduction method according to any one of claims 1 to 8 is implemented.

11. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the instructions are executed by the processor, the drill string vibration reduction method according to any one of claims 1 to 8 is implemented.

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