A method and system for setting drilling parameters and power drilling tools

Abstract

The application discloses a drilling parameter and power drilling tool setting method and system, and relates to the field of drilling. The setting method comprises the following steps: establishing a drill string system dynamics model according to a drill string and a screw drill used in a drilling site; calculating structural parameters of the drill string system dynamics model according to the size of each part of the drill string; calculating the output rotating speed and output torque of the screw drill according to the parameters and hydraulic parameters corresponding to the current iteration screw drill model; inputting the output rotating speed of the screw drill, the output torque of the screw drill and the current iteration hydraulic parameters into the drill string system dynamics model to obtain the response parameters of a drill bit; calculating the current iteration stick-slip severity index according to the motion response parameters of the drill bit; and determining the power drilling tool and the drilling parameter according to the current iteration stick-slip severity index. The application can set the drilling parameter and the power drilling tool under the condition of considering the downhole stick-slip vibration, can avoid the occurrence of the drill string stick-slip vibration and can improve the rate of penetration.

Description

Technical Field

[0001] This invention relates to the field of drilling, and in particular to a method and system for setting drilling parameters and power drilling tools. Background Technology

[0002] Drilling, as a crucial link in the petroleum industry, plays an indispensable role in cost control. With the development of drilling technology and the deepening of oil and gas extraction, the frequent occurrence of downhole accidents has increased drilling costs. Drill string vibration is a significant cause of downhole accidents, with stick-slip vibration being the most common and destructive form. The drill string exhibits a periodic phenomenon of sticking-slipping-sticking. Because the torque transmitted from the drill pipe to the drill bit is insufficient to break the rock, the drill string is in a sticky state. When the accumulated torque at the drill bit is sufficient to break the rock, the drill bit breaks the sticky state, releasing the accumulated torque and rotating at several times the speed of the rotary table, entering a slipping state. Stick-slip vibration exacerbates drill bit wear, leading to drill string fatigue failure, reducing the rate of penetration (ROP), prolonging the drilling cycle, and increasing drilling costs.

[0003] Positive displacement motors (PDMs) are a widely used type of downhole power drilling tool. They can be used to drill specialized wells, such as directional wells, horizontal wells, and extended reach wells, as well as vertical wells. PDMs utilize a motor to convert the hydraulic energy of high-pressure fluid into mechanical energy, outputting rotational speed and torque to drive the drill bit for drilling. During operation, rotational speed and torque are two independent parameters. Rotational speed depends only on the displacement and structure, not on the operating conditions, while torque depends on pressure drop and structure, not on rotational speed. Therefore, the model and hydraulic parameters of the PDM have the greatest impact on its performance.

[0004] Currently, the selection of screw drill bits in the drilling field mainly focuses on matching the specific specifications, models, and structural types of the screw drill bits to the drilling process requirements, while neglecting the influence of downhole conditions during actual drilling. When stick-slip vibration occurs at the bottom of the well, whether the torque and speed provided by the screw drill bit can eliminate stick-slip vibration is crucial for ensuring drilling safety and improving drilling speed. Therefore, the impact of downhole stick-slip vibration should also be considered when setting hydraulic parameters and selecting screw drill bit models.

[0005] Patent CN113688482A discloses a simulation method for the dispersion quality of drill string stick-slip vibration. It establishes a stick-slip vibration simulation model based on the fundamental parameters of the actual drill string system. However, this method does not consider cases where the drill string structure includes screw drill bits, and the drilling parameters do not include hydraulic parameters. Patent CN116244906A discloses a simulation method for the stick-slip vibration of drill strings in the horizontal section of oil and gas horizontal wells. This method mainly focuses on the simulation of stick-slip vibration of drill strings in the horizontal section of horizontal wells and does not involve screw drill bits. Patent CN113638729A discloses a method for suppressing drill string stick-slip vibration considering a torsional impactor. This method establishes a drill string stick-slip vibration simulation model including torsional impact, and achieves the effect of drill string stick-slip vibration by adjusting the operating parameters of the torsional impactor. However, the model established by this method also does not consider screw drill bits and does not involve the setting of hydraulic parameters. Patent CN114021358A discloses a method for optimizing drilling parameters in horizontal wells, which selects the drilling pressure through MSE theory. However, this method is for horizontal wells, does not consider drill string stick-slip vibration and screw drill tools, and does not involve the setting of hydraulic parameters.

[0006] In summary, there is an urgent need to propose drilling parameters and power tool settings that take into account downhole stick-slip vibration, so as to guide drilling personnel to accurately control hydraulic parameters and select screw drill bit models, avoid the occurrence of drill string stick-slip vibration, improve mechanical drilling speed, and reduce drilling costs. Summary of the Invention

[0007] The purpose of this invention is to provide a system for setting drilling parameters and power drill tools. By setting drilling parameters and power drill tools in consideration of downhole stick-slip vibration, the occurrence of drill string stick-slip vibration can be avoided, thereby improving the mechanical drilling rate.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] A method for setting drilling parameters and power drilling tools, the method comprising:

[0010] Based on the drill string and screw drill used at the drilling site, a dynamic model of the drill string system is established using the Lagrange method and d'Alembert's principle;

[0011] Based on the dimensions of each part of the drill string, the structural parameters of the drill string system dynamic model are calculated;

[0012] Based on the parameters corresponding to the screw drill model in the current iteration and the hydraulic parameters in the current iteration, the output speed and output torque of the screw drill are calculated.

[0013] The output speed of the screw drill bit, the output torque of the screw drill bit, and the hydraulic parameters of the current iteration are input into the dynamic model of the drill string system to obtain the response parameters of the drill bit;

[0014] The stick-slip severity index for the current iteration is calculated based on the drill bit's motion response parameters.

[0015] Determine whether the stick-slip severity index of the current iteration meets the termination condition, and obtain the first determination result;

[0016] If the first judgment result is yes, then the screw drill string model of the current iteration will be output as the power drill string, and the hydraulic parameters of the current iteration will be output as the drilling parameters.

[0017] If the first judgment result is negative, then adjust the hydraulic parameters of the current iteration and / or change the screw drill bit model of the current iteration, and return to the step of calculating the output speed and output torque of the screw drill bit based on the parameters corresponding to the screw drill bit model of the current iteration and the hydraulic parameters of the current iteration.

[0018] Optionally, based on the drill string and screw drill tools used at the drilling site, a dynamic model of the drill string system is established using the Lagrange method and d'Alembert's principle, specifically including:

[0019] The drill string is modeled according to its length to obtain multiple drill string mass blocks;

[0020] The screw drill bit is modeled as an upper component and a lower component; the upper component is the part of the screw drill bit that connects to the drill collar, and is modeled as a discrete mass block with the same moment of inertia as the drill collar; the lower component is the part of the screw drill bit that connects to the drill bit, and is modeled as a discrete mass block with the same moment of inertia as the drill bit.

[0021] The universal joint and drive shaft of the screw drill are modeled as a connecting body;

[0022] Based on the multiple drill string mass blocks, discrete mass blocks with the same moment of inertia as the drill collar, discrete mass blocks with the same moment of inertia as the drill bit, and the connecting body, a dynamic model of the drill string system is established using the Lagrange method and d'Alembert's principle.

[0023] Optionally, the dynamic model of the drill string system is:

[0024]

[0025] Among them, J r J represents the moment of inertia of the turntable. dp1 J represents the moment of inertia of the first section of the drill pipe; dp(i) J represents the moment of inertia of the i-th segment of the drill pipe; dc1 J represents the moment of inertia of the first drill collar. dc(i) J represents the moment of inertia of the i-th drill collar; pb This represents the moment of inertia of the drill bit. This represents the angular acceleration of the first section of the drill pipe; This represents the angular acceleration of the i-th segment of the drill pipe; This represents the angular acceleration of the first section of the drill collar; Let represent the angular acceleration of the i-th drill collar; dp1 represents the angular acceleration of the screw-drill bit mass block; r represents the rotary table; dp1 represents the first drill pipe segment; dp(i) represents the i-th drill pipe segment; dc1 represents the first drill collar segment; dc(i) represents the i-th drill collar segment; pb represents the screw-drill bit mass block; J represents the moment of inertia. Indicates angular acceleration; θ represents angular velocity; θ represents angular displacement; θ dp1 θ represents the angular displacement of the first section of the drill pipe. dp(i) θ represents the angular displacement of the i-th segment of the drill pipe; dc1 θ represents the angular displacement of the first drill collar. dc(i) θ represents the angular displacement of the i-th drill collar segment; pb This indicates the angular displacement of the lower part of the screw-drill bit mass block; This indicates the angular velocity of the first section of the drill pipe connected to the rotary table; This represents the angular velocity of the i-th segment of the drill pipe; This indicates the angular velocity of the first drill collar; This represents the angular velocity of the i-th drill collar; θ represents the angular velocity of the lower screw-drill bit mass block. r Indicates the angular displacement of the turntable; Indicates the angular velocity of the turntable; k represents the angular acceleration of the turntable. rp Indicates the torsional stiffness between the rotary table and the drill pipe; k pp Indicates the torsional stiffness between drill pipes; k pc Indicates the torsional stiffness between the drill pipe and the drill collar; k cc Indicates the torsional stiffness between drill collars; k cb This indicates the torsional stiffness between the upper mass block of the drill collar-screw and the lower mass block of the screw-drill bit; c rp This indicates the torsional damping between the rotary table and the drill pipe; c pp Indicates the torsional damping between drill pipes; c pc Indicates the torsional damping between the drill pipe and the drill collar; c cc This indicates the torsional damping between drill collars; c cb T represents the torsional damping between the upper mass block of the drill collar-screw and the lower mass block of the screw-drill bit; T represents the torque input to the rotary table by the drive motor; T ar T represents the loss damping of the drive system; fb T represents the frictional torque between the drill bit and the formation. ab T represents the viscous damping torque of the drill bit. tThis indicates the output torque of the screw drill bit.

[0026] Optionally, the structural parameters include the rotational inertia of the drill pipe, drill collar, and lower screw-drill bit; the torsional stiffness between the rotary table and the drill pipe, between the drill pipe and the drill pipe, between the drill pipe and the drill collar, and between the drill collars; the torsional stiffness between the drill collar and the upper screw and between the lower screw and the drill bit; the torsional damping between the rotary table and the drill pipe, between the drill pipe and the drill pipe, between the drill pipe and the drill collar, and between the drill collars; and the torsional damping between the drill collar and the upper screw and between the lower screw and the drill bit.

[0027] Optionally, based on the parameters corresponding to the screw drill bit model in the current iteration and the hydraulic parameters in the current iteration, the formulas for calculating the output speed and output torque of the screw drill bit are as follows:

[0028]

[0029]

[0030]

[0031] Where n represents the output rotational speed of the screw drill bit; T t Indicates the output torque of the screw drill bit; Q represents the displacement of the current iteration; η v The volumetric efficiency of the current iteration is represented by pl; the pressure drop of the current iteration is represented by q; the displacement per revolution of the screw drill bit model corresponding to the current iteration is represented by D. k The stator outer diameter of the motor corresponding to the screw drill bit model in the current iteration is represented by η; N represents the number of motor heads corresponding to the screw drill bit model in the current iteration is represented by r0; η represents the equidistant radius coefficient ... m The value of represents the mechanical efficiency of the screw drill bit; h represents the pitch of the screw drill bit.

[0032] Optionally, the formula for calculating the stick-slip severity index of the current iteration based on the drill bit's motion response parameters is as follows:

[0033]

[0034] Where TSE represents the stick-slip severity index of the current iteration; MAX response-parameter Indicates the maximum response parameter of the drill bit within the time interval; Ave response-parameter This represents the average drill bit response parameters over the time interval.

[0035] Optionally, adjusting the hydraulic parameters of the current iteration and / or changing the screw drill bit model of the current iteration specifically includes:

[0036] Determine whether the screw drill bit of the current iteration has reached the screw rated value under the hydraulic parameters of the current iteration, and obtain the second judgment result;

[0037] Determine whether the drilling pump has reached its rated value under the hydraulic parameters of the current iteration, and obtain the third judgment result;

[0038] If the second judgment result or the third judgment result is yes, then change the screw drill model of the current iteration and adjust the hydraulic parameters based on the hydraulic parameters of the current iteration;

[0039] If the second and third judgment results are negative, then adjust the hydraulic parameters of the current iteration until the screw drill bit of the current iteration reaches the screw rated value or the drilling pump reaches the drilling pump rated value under the adjusted hydraulic parameters. Then return to the step of changing the screw drill bit model of the current iteration and adjusting the hydraulic parameters based on the hydraulic parameters of the current iteration.

[0040] Optionally, the output rotational speed, output torque of the screw drill bit, and the hydraulic parameters of the current iteration are input into the dynamic model of the drill string system to obtain the response parameters of the drill bit, specifically including:

[0041] The output speed, output torque, and hydraulic parameters of the screw drill bit are input into the dynamic model of the drill string system, and the Runge-Kutta method with variable step size is used to solve the problem to obtain the response parameters of the drill bit.

[0042] A drilling parameter and power drill bit setting system is provided, wherein the drilling parameter and power drill bit setting system is applied to the above-described drilling parameter and power drill bit setting method, and the drilling parameter and power drill bit setting system includes:

[0043] The module is used to build a dynamic model of the drill string system based on the drill string and screw drill tools used at the drilling site, using the Lagrange method and d'Alembert's principle.

[0044] The first calculation module is used to calculate the structural parameters of the drill string system dynamic model based on the dimensions of each part of the drill string;

[0045] The second calculation module is used to calculate the output speed and output torque of the screw drill bit based on the parameters corresponding to the screw drill bit model of the current iteration and the hydraulic parameters of the current iteration.

[0046] The third calculation module is used to input the output speed of the screw drill bit, the output torque of the screw drill bit, and the hydraulic parameters of the current iteration into the dynamic model of the drill string system to obtain the response parameters of the drill bit;

[0047] The fourth calculation module is used to calculate the stick-slip severity index of the current iteration based on the motion response parameters of the drill bit.

[0048] The output judgment module is used to determine whether the stick-slip severity index of the current iteration meets the termination condition and obtain a first judgment result. If the first judgment result is yes, the screw drill string model of the current iteration is output as the power drill string, and the hydraulic parameters of the current iteration are output as drilling parameters. If the first judgment result is no, the hydraulic parameters of the current iteration are adjusted and / or the screw drill string model of the current iteration is changed, and the steps of calculating the output speed and output torque of the screw drill string based on the parameters corresponding to the screw drill string model of the current iteration and the hydraulic parameters of the current iteration are returned.

[0049] A computer-readable storage medium storing a computer program that, when executed, implements the above-described method for setting drilling parameters and power drilling tools.

[0050] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0051] This invention discloses a method and system for setting drilling parameters and power drilling tools. The method includes: establishing a dynamic model of the drill string system based on the drill string and screw drilling tool used at the drilling site; calculating the structural parameters of the dynamic model of the drill string system based on the dimensions of each part of the drill string; calculating the output speed and output torque of the screw drilling tool based on the parameters and hydraulic parameters corresponding to the screw drilling tool model of the current iteration; inputting the output speed, output torque, and hydraulic parameters of the screw drilling tool of the current iteration into the dynamic model of the drill string system to obtain the response parameters of the drill bit; calculating the stick-slip severity index of the current iteration based on the motion response parameters of the drill bit; and determining the power drilling tool and drilling parameters based on the stick-slip severity index of the current iteration. This invention sets drilling parameters and power drilling tools considering downhole stick-slip vibration, which can avoid the occurrence of drill string stick-slip vibration and improve the mechanical drilling rate. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a flowchart illustrating the method for setting drilling parameters and power drilling tools in an embodiment of the present invention;

[0054] Figure 2 This is a graph showing the response parameters of the drill bit in the drilling parameters and power drilling tool setting method of this invention embodiment;

[0055] Figure 3This is a schematic diagram of the drill bit response parameters in the drilling parameters and power drilling tool setting method of this embodiment of the invention. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] The purpose of this invention is to provide a system for setting drilling parameters and power drill tools. By setting drilling parameters and power drill tools in consideration of downhole stick-slip vibration, the occurrence of drill string stick-slip vibration can be avoided, thereby improving the mechanical drilling rate.

[0058] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] Example 1

[0060] like Figure 1 As shown, the present invention provides a method for setting drilling parameters and power drilling tools, the method comprising:

[0061] Step 101: Based on the drill string and screw drill used at the drilling site, establish a dynamic model of the drill string system using the Lagrange method and d'Alembert's principle.

[0062] Step 102: Calculate the structural parameters of the drill string system dynamic model based on the dimensions of each part of the drill string.

[0063] Step 103: Calculate the output speed and output torque of the screw drill bit based on the parameters corresponding to the current iteration's screw drill bit model and the hydraulic parameters of the current iteration. The screw drill bit corresponding to the first iteration in the current iteration is the screw drill bit used at the drilling site.

[0064] Step 104: Input the output speed of the screw drill bit, the output torque of the screw drill bit, and the hydraulic parameters of the current iteration into the dynamic model of the drill string system to obtain the response parameters of the drill bit.

[0065] Step 105: Calculate the stick-slip severity index for the current iteration based on the drill bit's motion response parameters. The stick-slip severity index is calculated based on the obtained drill bit's motion response parameters to evaluate and quantify stick-slip vibration.

[0066] Step 106: Determine the power drill string and drilling parameters based on the stick-slip severity index of the current iteration, specifically including:

[0067] Determine whether the stick-slip severity index of the current iteration meets the termination condition to obtain the first determination result. If the first determination result is yes, then the screw drill string model of the current iteration is output as the power drill string, and the hydraulic parameters of the current iteration are output as the drilling parameters.

[0068] If the first judgment result is negative, then adjust the hydraulic parameters of the current iteration and / or change the screw drill bit model of the current iteration, and return to the step of calculating the output speed and output torque of the screw drill bit based on the parameters corresponding to the screw drill bit model of the current iteration and the hydraulic parameters of the current iteration.

[0069] By changing hydraulic parameters or selecting the type of screw drill bit, the stick-slip severity index can be reduced, thereby suppressing or eliminating stick-slip vibration.

[0070] In practice, if the stick-slip severity index is less than 1, select the hydraulic parameters at this time as the drilling parameters and select this type of screw drill as the power drill. If the stick-slip severity index is greater than 1, adjust the hydraulic parameters and repeat steps 103-106 to obtain the stick-slip severity index under different hydraulic parameter conditions until the stick-slip severity index is lower than 1. Select the hydraulic parameters at this time as the drilling parameters. If adjusting the hydraulic parameters to reach the rated value of this type of screw drill or the rated value of the drilling pump still cannot reduce the stick-slip severity index, it is necessary to change the model of the screw drill and select a screw drill with greater output power. Repeat steps 103-106 to finally obtain the hydraulic parameters and screw drill model with a stick-slip severity index lower than 1.

[0071] As a specific embodiment, based on the drill string and screw drill used at the drilling site, a dynamic model of the drill string system is established using the Lagrange method and d'Alembert's principle, specifically including:

[0072] Model the drill string according to its length to obtain multiple drill string mass blocks.

[0073] The screw drill bit is modeled as an upper component and a lower component; the upper component is the part of the screw drill bit that connects to the drill collar, and is modeled as a discrete mass block with the same moment of inertia as the drill collar; the lower component is the part of the screw drill bit that connects to the drill bit, and is modeled as a discrete mass block with the same moment of inertia as the drill bit.

[0074] The universal joint and drive shaft of the screw drill bit are modeled as a connecting body. The universal joint and drive shaft of the screw drill bit are modeled as the same spring in the model, used to connect the upper and lower components, located between a discrete mass block with the same moment of inertia as the drill collar and a discrete mass block with the same moment of inertia as the drill bit.

[0075] Based on the multiple drill string mass blocks, discrete mass blocks with the same moment of inertia as the drill collar, discrete mass blocks with the same moment of inertia as the drill bit, and the connecting body, a dynamic model of the drill string system is established using the Lagrange method and d'Alembert's principle.

[0076] As a specific embodiment, the dynamic model of the drill string system is as follows:

[0077]

[0078] Among them, J r J represents the moment of inertia of the turntable. dp1 J represents the moment of inertia of the first section of the drill pipe; dp(i) J represents the moment of inertia of the i-th segment of the drill pipe; dc1 J represents the moment of inertia of the first drill collar. dc(i) J represents the moment of inertia of the i-th drill collar; pb This represents the moment of inertia of the drill bit. This represents the angular acceleration of the first section of the drill pipe; This represents the angular acceleration of the i-th segment of the drill pipe; This represents the angular acceleration of the first section of the drill collar; Let represent the angular acceleration of the i-th drill collar; dp1 represents the angular acceleration of the screw-drill bit mass block; r represents the rotary table; dp1 represents the first drill pipe segment; dp(i) represents the i-th drill pipe segment; dc1 represents the first drill collar segment; dc(i) represents the i-th drill collar segment; pb represents the screw-drill bit mass block; J represents the moment of inertia. Indicates angular acceleration; θ represents angular velocity; θ represents angular displacement; θ dp1 θ represents the angular displacement of the first section of the drill pipe. dp(i) θ represents the angular displacement of the i-th segment of the drill pipe; dc1 θ represents the angular displacement of the first drill collar. dc(i) θ represents the angular displacement of the i-th drill collar segment; pb This indicates the angular displacement of the lower part of the screw-drill bit mass block; This indicates the angular velocity of the first section of the drill pipe connected to the rotary table; This represents the angular velocity of the i-th segment of the drill pipe; 1 represents the angular velocity of the first drill collar; This represents the angular velocity of the i-th drill collar; θ represents the angular velocity of the lower screw-drill bit mass block. r Indicates the angular displacement of the turntable; Indicates the angular velocity of the turntable; k represents the angular acceleration of the turntable. rp Indicates the torsional stiffness between the rotary table and the drill pipe; k ppIndicates the torsional stiffness between drill pipes; k pc Indicates the torsional stiffness between the drill pipe and the drill collar; k cc Indicates the torsional stiffness between drill collars; k cb This indicates the torsional stiffness between the upper mass block of the drill collar-screw and the lower mass block of the screw-drill bit; c rp This indicates the torsional damping between the rotary table and the drill pipe; c pp Indicates the torsional damping between drill pipes; c pc Indicates the torsional damping between the drill pipe and the drill collar; c cc This indicates the torsional damping between drill collars; c cb T represents the torsional damping between the upper mass block of the drill collar-screw and the lower mass block of the screw-drill bit; T represents the torque input to the rotary table by the drive motor; T ar T represents the loss damping of the drive system; fb T represents the frictional torque between the drill bit and the formation. ab T represents the viscous damping torque of the drill bit. t This indicates the output torque of the screw drill bit.

[0079] As a specific embodiment, the structural parameters include the rotational inertia of the drill pipe, drill collar, and lower screw-drill bit; the torsional stiffness between the rotary table and the drill pipe, between the drill pipe and the drill pipe, between the drill pipe and the drill collar, and between the drill collars; the torsional stiffness between the drill collar-upper screw and the lower screw-drill bit; the torsional damping between the rotary table and the drill pipe, between the drill pipe and the drill pipe, between the drill pipe and the drill collar, and between the drill collars; and the torsional damping between the drill collar-upper screw and the lower screw-drill bit.

[0080] As a specific embodiment, based on the parameters corresponding to the screw drill bit model in the current iteration and the hydraulic parameters in the current iteration, the formulas for calculating the output speed and output torque of the screw drill bit are as follows:

[0081]

[0082]

[0083]

[0084] Where n represents the output rotational speed of the screw drill bit; T t Indicates the output torque of the screw drill bit; Q represents the displacement of the current iteration; η v The volumetric efficiency of the current iteration is represented by pl; the pressure drop of the current iteration is represented by q; the displacement per revolution of the screw drill bit model corresponding to the current iteration is represented by D. k The stator outer diameter of the motor corresponding to the screw drill bit model in the current iteration is represented by N; the number of motor heads corresponding to the screw drill bit model in the current iteration is represented by r0; the equidistant radius coefficient is represented by η. mThe value of represents the mechanical efficiency of the screw drill bit; h represents the pitch of the screw drill bit.

[0085] As a specific embodiment, the formula for calculating the stick-slip severity index of the current iteration based on the drill bit's motion response parameters is as follows:

[0086]

[0087] Where TSE represents the stick-slip severity index of the current iteration; MAX response-parameter Indicates the maximum response parameter of the drill bit within the time interval; Ave response-parameter This represents the average drill bit response parameters over the time interval.

[0088] As a specific embodiment, adjusting the hydraulic parameters of the current iteration and / or changing the screw drill bit model of the current iteration specifically includes:

[0089] Determine whether the screw drill bit of the current iteration has reached the screw rated value under the hydraulic parameters of the current iteration, and obtain the second judgment result.

[0090] Determine whether the drilling pump has reached its rated value under the hydraulic parameters of the current iteration, and obtain the third judgment result.

[0091] If the second or third judgment result is yes, then the screw drill model of the current iteration is changed, and the hydraulic parameters are adjusted based on the hydraulic parameters of the current iteration.

[0092] If the second and third judgment results are negative, then adjust the hydraulic parameters of the current iteration until the screw drill bit of the current iteration reaches the screw rated value or the drilling pump reaches the drilling pump rated value under the adjusted hydraulic parameters. Then return to the step of changing the screw drill bit model of the current iteration and adjusting the hydraulic parameters based on the hydraulic parameters of the current iteration.

[0093] As a specific embodiment, the output rotational speed, output torque of the screw drill bit, and the hydraulic parameters of the current iteration are input into the dynamic model of the drill string system to obtain the response parameters of the drill bit, specifically including:

[0094] The output speed, output torque, and hydraulic parameters of the screw drill bit are input into the dynamic model of the drill string system, and the Runge-Kutta method with variable step size is used to solve the problem to obtain the response parameters of the drill bit.

[0095] As a specific example:

[0096] The selected drill string parameters were from a deep well in the Shunbei Block of the Tarim Oilfield, which was drilled to a depth of 5000m.

[0097] Step 1: Based on the structure and length of the drill string used at the drilling site, establish a dynamic model of the drill string system, including the screw drill string, using the Lagrange method and d'Alembert's principle.

[0098] The drill string structure for this well section mainly consists of a rotary table, drill pipe, drill collars, screw drill string, and drill bit. The drill pipe (total length 4800m) is subdivided into 16 mass blocks, the drill collars (total length 140m) are assumed to be 2 mass blocks, and the rotary table and drill bit are each considered as one mass block. The screw drill string consists of an upper assembly and a lower assembly. The upper assembly is discrete mass block A, which has the same moment of inertia as the drill collars, representing the part where the screw drill string connects to the drill collars. The lower assembly is discrete mass block B, which has the same moment of inertia as the drill bit, representing the part where the screw drill string connects to the drill bit. The universal joint and drive shaft of the screw drill string are modeled as the connection between discrete mass blocks A and B. The established dynamic model of the drill string system including the screw drill string is as follows:

[0099]

[0100] Where the subscripts r, dp1~dp 16 dc1~dc2 and pb represent the rotary table, the first to the 16th drill pipe sections, the first to the second drill collar sections, and the lower part of the screw-drill bit mass block, respectively; J represents the moment of inertia. θ and θ represent angular acceleration, angular velocity, and angular displacement, respectively; k rp k pp k pc and k cc k represents the torsional stiffness between the rotary table and drill pipe, between drill pipes, between drill pipes, and between drill collars, respectively. cp This indicates the torsional stiffness between the upper mass block of the drill collar-screw and the lower mass block of the screw-drill bit; c rp c pp c pc and c cc c represents the torsional damping between the rotary table and drill pipe, between drill pipes, between drill pipes, and between drill collars, respectively. cb Torsional damping between the upper mass block of the drill collar-screw and the lower mass block of the drill bit; T represents the torque input to the turntable by the drive motor.

[0101]

[0102] Where, ω d Set the rotation speed for the turntable. This refers to the actual rotational speed of the turntable. T represents the actual rotational speed of the drill pipe connected to the rotary table. ar Indicates the loss damping of the drive system:

[0103]

[0104] Among them, C rs The damping coefficient of the drive system. The frictional torque T between the drill bit and the formation. fb for:

[0105]

[0106] in, D is the drill bit rotation speed, which is the sum of the rotation speed transmitted from the rotary table to the drill bit and the output rotation speed of the screw drill bit; v T represents a very small positive integer; eb (x) represents the dynamic friction torque at the drill bit at the corresponding rotational speed:

[0107]

[0108] T ab For the viscous damping torque of the drill bit:

[0109]

[0110] Among them, c pb T is the damping coefficient of the drill bit. sb The static friction torque between the drill bit and the formation:

[0111] T sb =R b ·W ob μ sb

[0112] R b W is the drill bit radius. ob For drilling pressure, μ sb Represents the static friction coefficient, and sign(y) is the sign function:

[0113]

[0114] μ b The coefficient of friction at the drill bit:

[0115]

[0116] μ cb γ represents the coefficient of kinetic friction; γ represents the attenuation coefficient.

[0117] Step 2: Calculate the structural parameters used in the model based on the dimensions of each part of the drill string, namely, moment of inertia, torsional stiffness, and torsional damping, etc.

[0118] The drill pipe has an outer diameter of 139.7 mm and an inner diameter of 118.62 mm. The drill collar has an outer diameter of 203.2 mm and an inner diameter of 71.44 mm. The screw drill bit has an outer diameter of 127 mm and a drill bit diameter of 333.38 mm.

[0119]

[0120]

[0121]

[0122] Among them, J dp J dc J is the moment of inertia of the drill pipe and drill collar. pb Let ρ be the moment of inertia of the drill bit, ρ be the density of the drill string material, and D be the moment of inertia of the drill bit. p d p D represents the outer and inner diameters of the drill pipe. c d c L represents the outer and inner diameters of the drill collar. p L is the length of the drill pipe. c This is the length of the drill collar.

[0123]

[0124] Where k is the torsional stiffness, L is the length, G is the shear modulus, D is the outer diameter, and d is the inner diameter.

[0125] The formula for calculating the torsional damping is:

[0126] c=αM+βK

[0127] Where c is the torsional damping, M is the mass matrix, K is the torsional stiffness matrix, and α and β are the Rayleigh damping coefficients.

[0128] The drill string structural parameters are calculated as follows: J dp = 42.285 kg·m 2 J dc = 90.568 kg·m 2 J pb = 111.71 kg·m 2 ;k rp = 4764 N·m / rad; k pp = 4764 N·m / rad; k pc = 187420 N·m / rad; k cc = 187420 N·m / rad; k cb = 216570 N·m / rad; c rp = 477 N·m·s / rad; c pp = 477 N·m·s / rad; c pc= 919.87 N·m·s / rad; c cc = 919.87 N·m·s / rad; c cb = 239.54 N·m·s / rad.

[0129] Step 3: Calculate the output speed and output torque of the screw drill bit based on its structure and hydraulic parameters:

[0130] The well is approximately 5000m deep, with a drill bit size of 333.38mm. Therefore, a screw rod size of 244mm was selected, and a motor with 7 heads was chosen. The final screw drill string was determined to be the 7LZ244 type. Based on its structure and hydraulic parameters, the output parameters of the screw drill string were calculated, including:

[0131]

[0132]

[0133]

[0134] The selected parameter values ​​are: Q = 25 L / s, η v =0.92, pl=21MPa, D k =15.2cm, N=7, r0=2. The calculated output parameters of the screw drill are: n=50.26r / min, T t =8843.8 N·m.

[0135] like Figure 2 and Figure 3 As shown, in step four, the output speed, output torque, and drilling parameters of the screw drill bit are used as input parameters for the drill string dynamics model. The Runge-Kutta method with variable step size is used to solve the model and obtain the response parameters of the drill bit.

[0136] Step 5: Based on the obtained drill bit motion response parameters, calculate the stick-slip severity index to evaluate and quantify stick-slip vibration.

[0137]

[0138] In this implementation case, the stick-slip severity index was calculated using the drill bit rotation speed. The calculated stick-slip severity index for the period of 100s to 150s was 1.9951, which is far greater than 1, indicating severe stick-slip vibration. It is necessary to adjust the hydraulic parameters and increase the output parameters of the screw drill bit to suppress stick-slip vibration.

[0139] Step Six: By changing hydraulic parameters or selecting the type of screw drill bit, the stick-slip severity index can be reduced, thereby suppressing or eliminating stick-slip vibration.

[0140] Adjusting the hydraulic parameters and increasing the displacement to 30 L / s, steps three, four, and five were repeated. The calculated output speed of the screw drill bit was 59.59 r / min, the output torque was 9976 N·m, and the TSE was 1.7532, indicating that stick-slip vibration remained severe. Increasing the displacement to 40 L / s and repeating steps three, four, and five resulted in an output speed of 80 r / min, an output torque of 13301 N·m, and a stick-slip severity index of 1.4567. Considering the rated displacement of the screw drill bit, further increasing the hydraulic parameters would affect the tool's lifespan. Therefore, the screw drill bit model was adjusted. While maintaining the same well depth and drill bit size, and keeping the outer diameter of the screw drill bit at 244 mm, the number of motor heads was reduced to 5, allowing for a higher output speed compared to a 7-head motor. Repeat steps three, four, and five above. The output speed of the screw drill bit is calculated to be 123.9 r / min, the output torque is 8528.4 N·m, and the TSE is 0.686. The stick-slip vibration is effectively suppressed, and the drill bit drills relatively smoothly.

[0141] Example 2

[0142] A drilling parameter and power drill bit setting system is provided, wherein the drilling parameter and power drill bit setting system is applied to the drilling parameter and power drill bit setting method described in Embodiment 1, and the drilling parameter and power drill bit setting system includes:

[0143] The module is used to build a dynamic model of the drill string system based on the drill string and screw drilling tools used at the drilling site, using the Lagrange method and d'Alembert's principle.

[0144] The first calculation module is used to calculate the structural parameters of the drill string system dynamic model based on the dimensions of each part of the drill string.

[0145] The second calculation module is used to calculate the output speed and output torque of the screw drill bit based on the parameters corresponding to the screw drill bit model of the current iteration and the hydraulic parameters of the current iteration.

[0146] The third calculation module is used to input the output speed of the screw drill bit, the output torque of the screw drill bit, and the hydraulic parameters of the current iteration into the dynamic model of the drill string system to obtain the response parameters of the drill bit.

[0147] The fourth calculation module is used to calculate the stick-slip severity index of the current iteration based on the motion response parameters of the drill bit.

[0148] The output judgment module is used to determine whether the stick-slip severity index of the current iteration meets the termination condition and obtain a first judgment result. If the first judgment result is yes, the screw drill string model of the current iteration is output as the power drill string, and the hydraulic parameters of the current iteration are output as drilling parameters. If the first judgment result is no, the hydraulic parameters of the current iteration are adjusted and / or the screw drill string model of the current iteration is changed, and the steps of calculating the output speed and output torque of the screw drill string based on the parameters corresponding to the screw drill string model of the current iteration and the hydraulic parameters of the current iteration are returned.

[0149] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for setting drilling parameters and power drilling tools as described in Embodiment 1.

[0150] A computer-readable storage medium storing a computer program that, when executed, implements the method for setting drilling parameters and power drilling tools as described in Embodiment 1.

[0151] This invention includes: first, establishing a dynamic model of the drill string system (a multi-degree-of-freedom lumped mass model of the drill string system including the screw drill bit) using d'Alembert's principle and Lagrange's equations; second, calculating the drill string structural parameters used in the dynamic model; then, calculating the output rotational speed and output torque of the screw drill bit based on its structural and hydraulic parameters; next, using the output rotational speed, output torque, and hydraulic parameters (rotational speed, drilling pressure) of the screw drill bit as input parameters of the model, solving the model using the Runge-Kutta method to obtain the motion response parameters of the drill bit; then, calculating the stick-slip severity index based on the motion response parameters of the drill bit; finally, adjusting the hydraulic parameters or optimizing the screw drill bit model based on the stick-slip severity index to eliminate stick-slip vibration. This solves the problem of poor screw drill bit performance and the inability to suppress stick-slip vibration, leading to low mechanical drilling speed. This invention is based on the principle of "fully utilizing the performance of screw drill bits, optimizing hydraulic parameters, reducing stick-slip vibration, and improving drilling efficiency". It sets reasonable hydraulic parameters as much as possible, selects screw drill bits with matching models, reduces stick-slip vibration, increases mechanical drilling speed, shortens drilling cycle, and reduces drilling costs.

[0152] The beneficial effects of this invention are as follows:

[0153] (1) The present invention proposes a method for setting hydraulic parameters, which takes into account downhole stick-slip vibration, expands the basis for selecting screw drill bits, gives fuller play to the working performance of screw drill bits, ensures that less stick-slip vibration occurs during drilling, and achieves safe and fast drilling.

[0154] (2) This invention proposes a method for selecting the optimal screw drill string, taking into account actual drilling conditions. In the industry, it is common practice to select the screw drill string model based on the drilling process design. If the performance is unsatisfactory after drilling, the drill string is pulled out and replaced, which increases non-working time and prolongs the drilling cycle. The screw drill string type selected by the method described in this invention can avoid downhole vibration and reduce tripping time.

[0155] (3) This invention derives the kinematic differential equations of a screw drill. Based on a full consideration of the working principle of the screw drill, the upper component of the screw drill is modeled as a mass block with the same moment of inertia as the drill collar, and the lower component of the screw drill is modeled as a mass block with the same moment of inertia as the drill bit, which conforms to the working characteristics of the screw drill.

[0156] (4) This invention quantifies the stick-slip vibration of the drill string including the screw drill. The TSE is calculated using the drill bit motion response parameters obtained from simulation as the basis for quantification, which fully considers the motion characteristics of the drill bit during stick-slip vibration. Furthermore, the magnitude of TSE can more intuitively determine the length of the sticking time.

[0157] (5) This invention realizes the simulation of stick-slip vibration of drill strings containing screw drills, filling a gap in the current technical field. As a widely used speed-up tool, no one has yet established a dynamic model of screw drills. The simulation method of this invention can reproduce the stick-slip vibration when using screw drills and evaluate the effectiveness of screw drills in eliminating stick-slip vibration.

[0158] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0159] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for setting drilling parameters and power drilling tools, characterized in that, The methods for setting drilling parameters and power drilling tools include: Based on the drill string and screw drill used at the drilling site, a dynamic model of the drill string system is established using the Lagrange method and d'Alembert's principle; Based on the dimensions of each part of the drill string, the structural parameters of the drill string system dynamic model are calculated; Based on the parameters corresponding to the screw drill bit model in the current iteration and the hydraulic parameters in the current iteration, the formulas for calculating the output speed and output torque of the screw drill bit are as follows: ； ； ； in, n This indicates the output speed of the screw drill bit; T t This indicates the output torque of the screw drill bit; Q Indicates the displacement of the current iteration; η v This indicates the volumetric efficiency of the current iteration; pl This represents the pressure drop in the current iteration; q This indicates the displacement per revolution corresponding to the screw drill bit model in the current iteration; D k This indicates the outer diameter of the motor stator corresponding to the screw drill bit model in the current iteration; N This indicates the number of motor heads corresponding to the screw drill bit model in the current iteration; r 0 Indicates the equidistant radius coefficient; η m Indicates the mechanical efficiency of the screw drill bit; Indicates the pitch of the screw drill bit; The output speed of the screw drill bit, the output torque of the screw drill bit, and the hydraulic parameters of the current iteration are input into the dynamic model of the drill string system to obtain the response parameters of the drill bit; The stick-slip severity index for the current iteration is calculated based on the drill bit's motion response parameters. Determine whether the stick-slip severity index of the current iteration meets the termination condition, and obtain the first determination result; If the first judgment result is yes, then the screw drill string model of the current iteration will be output as the power drill string, and the hydraulic parameters of the current iteration will be output as the drilling parameters. If the first judgment result is negative, then adjust the hydraulic parameters of the current iteration and / or change the screw drill bit model of the current iteration, and return to the step of calculating the output speed and output torque of the screw drill bit based on the parameters corresponding to the screw drill bit model of the current iteration and the hydraulic parameters of the current iteration.

2. The method for establishing the dynamic model of the drill string system according to claim 1, characterized in that, Based on the drill string and screw drilling tools used at the drilling site, a dynamic model of the drill string system is established using the Lagrange method and d'Alembert's principle, specifically including: The drill string is modeled according to its length to obtain multiple drill string mass blocks; The screw drill bit is modeled as an upper component and a lower component; the upper component is the part of the screw drill bit that connects to the drill collar, and is modeled as a discrete mass block with the same moment of inertia as the drill collar; the lower component is the part of the screw drill bit that connects to the drill bit, and is modeled as a discrete mass block with the same moment of inertia as the drill bit. The universal joint and drive shaft of the screw drill are modeled as a connecting body; Based on the multiple drill string mass blocks, discrete mass blocks with the same moment of inertia as the drill collar, discrete mass blocks with the same moment of inertia as the drill bit, and the connecting body, a dynamic model of the drill string system is established using the Lagrange method and d'Alembert's principle.

3. The method for setting drilling parameters and power drilling tools according to claim 1, characterized in that, The dynamic model of the drill string system is as follows: ； in, J r This represents the moment of inertia of the turntable. J dp1 This represents the moment of inertia of the first section of the drill pipe; J dp(i) Let represent the moment of inertia of the i-th segment of the drill pipe; J dc1 This represents the moment of inertia of the first drill collar. J dc(i) Let represent the moment of inertia of the i-th drill collar; J pb This represents the moment of inertia of the drill bit. dp1 This represents the angular acceleration of the first section of the drill pipe; dp(i) This represents the angular acceleration of the i-th segment of the drill pipe; dc1 This represents the angular acceleration of the first section of the drill collar; dc(i) Let represent the angular acceleration of the i-th drill collar; pb This indicates the angular acceleration of the lower screw-drill bit mass block; r Indicates a turntable; dp1 Indicates the first section of the drill pipe; dp(i) This represents the i-th segment of the drill pipe; dc1 This indicates the first section of the drill collar; dc(i) This represents the i-th drill collar; pb This indicates the lower part of the screw - the drill bit mass block; J Indicates the moment of inertia. Indicates angular acceleration; Indicates angular velocity; θ Indicates angular displacement; θ dp1 This indicates the angular displacement of the first section of the drill pipe; θ dp(i) This represents the angular displacement of the i-th segment of the drill pipe; θ dc1 This indicates the angular displacement of the first drill collar; θ dc(i) This represents the angular displacement of the i-th drill collar segment; θ pb This indicates the angular displacement of the lower part of the screw-drill bit mass block; dp1 This indicates the angular velocity of the first section of the drill pipe connected to the rotary table; dp(i) This represents the angular velocity of the i-th segment of the drill pipe; dc1 This indicates the angular velocity of the first drill collar; dc(i) This represents the angular velocity of the i-th drill collar; pb This indicates the angular velocity of the lower part of the screw-drill bit mass block; θ r Indicates the angular displacement of the turntable; r Indicates the angular velocity of the turntable; r This represents the angular acceleration of the turntable; k rp This indicates the torsional stiffness between the rotary table and the drill pipe; k pp This indicates the torsional stiffness between drill pipes; k pc This indicates the torsional stiffness between the drill pipe and the drill collar; k cc This indicates the torsional stiffness between drill collars; k cb This indicates the torsional stiffness between the upper mass block of the drill collar-screw and the lower mass block of the screw-drill bit; c rp This indicates the torsional damping between the rotary table and the drill pipe; c pp This indicates the torsional damping between drill pipes; c pc This indicates the torsional damping between the drill pipe and the drill collar; c cc This indicates the torsional damping between drill collars; c cb This indicates the torsional damping between the upper mass block of the drill collar-screw and the lower mass block of the screw-drill bit; T This indicates the torque input to the turntable by the drive motor; T ar Indicates the loss damping of the drive system; T fb This represents the frictional torque between the drill bit and the formation; T ab This represents the viscous damping torque of the drill bit; T t This indicates the output torque of the screw drill bit.

4. The method for setting drilling parameters and power drilling tools according to claim 1, characterized in that, The structural parameters include the rotational inertia of the drill rod, drill collar, and lower screw-drill bit; the torsional stiffness between the rotary table and the drill rod, between the drill rod and the drill rod, between the drill rod and the drill collar, and between the drill collars; the torsional stiffness between the drill collar and the upper screw and between the lower screw and the drill bit; the torsional damping between the rotary table and the drill rod, between the drill rod and the drill rod, between the drill rod and the drill collar, and between the drill collars; and the torsional damping between the drill collar and the upper screw and between the lower screw and the drill bit.

5. The method for setting drilling parameters and power drilling tools according to claim 1, characterized in that, Based on the drill bit's motion response parameters, the formula for calculating the stick-slip severity index for the current iteration is as follows: ； in, TSE This indicates the stick-slip severity index for the current iteration; MAX response-parameter This represents the maximum response parameter of the drill bit within the time interval; Ave response-parameter This represents the average drill bit response parameters over the time interval.

6. The method for setting drilling parameters and power drilling tools according to claim 1, characterized in that, The adjustment of hydraulic parameters for the current iteration and / or replacement of the screw drill bit model for the current iteration specifically includes: Determine whether the screw drill bit of the current iteration has reached the screw rated value under the hydraulic parameters of the current iteration, and obtain the second judgment result; Determine whether the drilling pump has reached its rated value under the hydraulic parameters of the current iteration, and obtain the third judgment result; If the second judgment result or the third judgment result is yes, then change the screw drill model of the current iteration and adjust the hydraulic parameters based on the hydraulic parameters of the current iteration; If the second and third judgment results are negative, then adjust the hydraulic parameters of the current iteration until the screw drill bit of the current iteration reaches the screw rated value or the drilling pump reaches the drilling pump rated value under the adjusted hydraulic parameters. Then return to the step of changing the screw drill bit model of the current iteration and adjusting the hydraulic parameters based on the hydraulic parameters of the current iteration.

7. The method for setting drilling parameters and power drilling tools according to claim 1, characterized in that, The output speed, output torque, and hydraulic parameters of the screw drill bit are input into the dynamic model of the drill string system to obtain the response parameters of the drill bit, specifically including: The output speed, output torque, and hydraulic parameters of the screw drill bit are input into the dynamic model of the drill string system, and the Runge-Kutta method with variable step size is used to solve the problem to obtain the response parameters of the drill bit.

8. A system for setting drilling parameters and power drilling tools, characterized in that, The drilling parameter and power tool setting system is applied to the drilling parameter and power tool setting method according to any one of claims 1-7, and the drilling parameter and power tool setting system includes: The module is used to build a dynamic model of the drill string system based on the drill string and screw drill tools used at the drilling site, using the Lagrange method and d'Alembert's principle. The first calculation module is used to calculate the structural parameters of the drill string system dynamic model based on the dimensions of each part of the drill string; The second calculation module is used to calculate the output speed and output torque of the screw drill bit based on the parameters corresponding to the screw drill bit model of the current iteration and the hydraulic parameters of the current iteration. The third calculation module is used to input the output speed of the screw drill bit, the output torque of the screw drill bit, and the hydraulic parameters of the current iteration into the dynamic model of the drill string system to obtain the response parameters of the drill bit; The fourth calculation module is used to calculate the stick-slip severity index of the current iteration based on the drill bit's motion response parameters; The output judgment module is used to determine whether the stick-slip severity index of the current iteration meets the termination condition and obtain a first judgment result. If the first judgment result is yes, the screw drill string model of the current iteration is output as the power drill string, and the hydraulic parameters of the current iteration are output as drilling parameters. If the first judgment result is no, the hydraulic parameters of the current iteration are adjusted and / or the screw drill string model of the current iteration is changed, and the steps of calculating the output speed and output torque of the screw drill string based on the parameters corresponding to the screw drill string model of the current iteration and the hydraulic parameters of the current iteration are returned.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed, implements the method as described in any one of claims 1 to 7.

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