A method for determining the reasonable installation position of rotary punching tools

Abstract

The present invention discloses a method for determining a reasonable installation position of a rotary punch tool. The method comprises the following steps: based on measured wellbore trajectory parameters, drill string structural parameters and rotary punch tool characteristic parameters, taking into account different rotary punch tool installation positions, utilizing a drill string dynamics analysis method to obtain the maximum axial vibration speed of the drill string, determining the dynamic axial friction reduction amplitude of the drill string according to a Stribeck friction coefficient model, and determining the rotary punch tool position based on the maximum reduction amplitude.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield drilling, and in particular to a method for determining a reasonable installation position of a rotary percussion tool. Background Art

[0002] In order to reduce the stick-slip vibration of the drill string and increase the drilling speed, the research and development and application of drilling rotary percussion tools have received more and more attention.

[0003] The rotary percussion tool is not fixed in the drill string. When drilling in straight sections, it is generally connected directly to the drill bit or the upper end of the drill collar. By converting the kinetic energy of the drilling fluid into axial mechanical vibrations, the rotary percussion tool provides additional dynamic impact force for the drill bit's axial rock breaking, facilitating rock breaking and increasing drilling speed. Furthermore, due to the low weight on bit, the axial percussion-based rock breaking method minimizes lateral forces on the drill bit, thereby preventing deflection. This is particularly beneficial for preventing deflection and straightening the wellbore in steep structures and formations with high dip angles and prone to wellbore deviation. When drilling in highly deviated sections, the tool can be installed in the middle of the section, effectively addressing the problem of excessive axial friction.

[0004] However, during the use of the tool, due to the unreasonable installation position of the rotary punch, the drag reduction effect is often poor. Therefore, how to determine the appropriate installation position of the rotary punch tool is crucial. Summary of the Invention

[0005] In order to solve the problems of the existing technology, the purpose of the present invention is to overcome the shortcomings of the existing technology and provide a method for determining the reasonable installation position of the rotary punching tool. In response to the pseudo-problem existing in the drill tool combination with the rotary punching tool, the friction reduction amplitude is obtained, and the reasonable installation position of the rotary punching tool is determined based on the maximum reduction amplitude.

[0006] To achieve the above object, the present invention is conceived as follows:

[0007] Based on the measured wellbore trajectory parameters, drill string structural parameters, and rotary percussion tool characteristic parameters, and considering different rotary percussion tool installation positions, the drill string dynamics analysis method was used to obtain the maximum axial vibration velocity of the drill string. The dynamic axial friction reduction amplitude of the drill string was determined according to the Stribeck friction coefficient model, and the rotary percussion tool position was determined based on the maximum reduction amplitude.

[0008] According to the above invention concept, the present invention adopts the following technical solutions:

[0009] A method for determining the appropriate installation position of a rotary punching tool, the steps are as follows:

[0010] (1) Use laser measuring instruments, special gauges, etc. to measure the structural parameters of the drill string;

[0011] (2) Use three-axis accelerometers, fluxgate sensors or MWD, single-point, and multi-point inclinometers to measure wellbore trajectory parameters;

[0012] (3) Determine the performance parameters of the rotary punching tool;

[0013] (4) Establish a drill string dynamics analysis model;

[0014] (5) Calculate the reduction amplitude of the dynamic axial friction resistance of the drill string;

[0015] (6) Determine the installation position of the rotary punching tool corresponding to the maximum reduction amplitude as the reasonable installation position of the rotary punching tool.

[0016] Preferably, the step (1) of measuring the structural parameters of the drill string comprises measuring the outer diameter, inner diameter, length and density of the drill string using a measuring tool.

[0017] Preferably, the step (2) measures the wellbore trajectory parameters: measuring the wellbore trajectory parameters such as well diameter, well inclination and azimuth using a measuring tool.

[0018] Preferably, the step of determining the performance parameters of the rotary punching tool is: using a measuring tool or according to the performance parameters of the rotary punching tool provided by the manufacturer to determine the working frequency and impact force of the rotary punching tool.

[0019] Preferably, in the step (4) of establishing the drill string dynamics analysis model, a pulse axial force determined by the performance of the rotary impact tool is provided to the drill string at the installation position:

[0020]

[0021] Where F0 is the impact force of the hammer on the anvil, kN; Δt is the contact time, s; T is the period, s; ​​t represents time, s. Convert it into the superposition excitation of the Fourier series form of the corresponding node to obtain the frequency w of each order n , Hz and amplitude A n , kN, take the synthesis result of the first n-order components:

[0022] P(t)=∑A n sin w n t (2)

[0023] Preferably, in step (4) of establishing a drill string dynamics analysis model, the excitation in the form of Fourier series is substituted into the following drill string dynamics finite element model to determine the axial vibration velocity of the drill string and the contact force between the drill string and the well wall:

[0024]

[0025] Among them, M is the mass matrix, M Add is the additional mass matrix, C is the damping matrix, KL is the linear stiffness matrix, K NL is the nonlinear stiffness matrix, F is the external force matrix, U are generalized acceleration, generalized velocity, and generalized displacement respectively.

[0026] Preferably, the step (5) calculates the dynamic axial friction reduction amplitude of the drill string: according to the Stribeck model and the axial vibration speed caused by the rotary percussion tool, the dynamic friction coefficient at different positions is determined, and the friction reduction amplitude of the drill string is calculated;

[0027] Preferably, the step (6) determines the installation position of the rotary punching tool corresponding to the maximum reduction amplitude: by changing the installation position of the rotary punching tool, the optimal installation position is determined with the maximum friction reduction amplitude as an indicator.

[0028] Preferably, the wellbore is a vertical well, a directional well, a horizontal well or an extended reach well.

[0029] Preferably, the operating frequency of the rotary punching tool is between 5 and 200 Hz.

[0030] Compared with the prior art, the present invention has the following obvious outstanding substantial features and significant advantages:

[0031] 1. This new method for determining the optimal installation position of a rotary percussion tool decomposes the pulse excitation of the rotary percussion tool into a multi-order sinusoidal function. The axial vibration velocity of each node of the drill string is determined based on a drill string dynamics model. The dynamic friction coefficient of each node is obtained using Stribeck friction theory. Combined with the average dynamic contact force, the friction reduction of the drill string is calculated.

[0032] 2. The present invention adjusts the installation position and operating frequency of the rotary punching tool to obtain the friction reduction amplitude. Based on the maximum reduction amplitude, the optimal installation position of the rotary punching tool is determined.

[0033] 3. The present invention is applicable to a range of commonly used drill bits and drill collar sizes, various rotary percussion tools, and various wellbore trajectories, including vertical wells, directional wells, horizontal wells, and extended reach wells; the rotary percussion tool frequency is generally between 5 and 200 Hz;

[0034] 4. The method of the present invention is simple, easy to implement, low in cost, and suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flowchart of the operating procedures of the present invention.

[0036] Figure 2 This is the time history curve of the rotary impact excitation.

[0037] Figure 3 It synthesizes pulse excitation in the form of trigonometric function.

[0038] Figure 4 This is a typical Stribeck model - the relationship curve between relative motion speed and dynamic friction coefficient.

[0039] Figure 5 The maximum axial velocity distribution of the drill string corresponding to the rotary percussion tool (20 Hz) installed at different positions.

[0040] Figure 6 is the friction coefficient curve.

[0041] Figure 7 The figure shows the reduction of overall friction resistance of the drill string under the action of rotary percussion tools at different installation positions and working frequencies.

[0042] Figure 8 The figure shows the change of friction resistance at each contact point when the rotary punch tool (20Hz) is installed in different positions. DETAILED DESCRIPTION

[0043] The above solution is further described below with reference to specific implementation examples. The preferred embodiments of the present invention are described in detail as follows:

[0044] Example 1:

[0045] In this embodiment, see Figure 1 A method for determining the proper installation position of a rotary punching tool is described in the following steps:

[0046] (1) Measure the structural parameters of the drill string;

[0047] (2) measuring wellbore trajectory parameters;

[0048] (3) Determine the performance parameters of the rotary punching tool;

[0049] (4) Establish a drill string dynamics analysis model;

[0050] (5) Calculate the reduction amplitude of the dynamic axial friction resistance of the drill string;

[0051] (6) Determine the installation position of the rotary punching tool corresponding to the maximum reduction amplitude as the reasonable installation position of the rotary punching tool.

[0052] This embodiment addresses a pseudo-problem existing in a drilling tool assembly with a rotary punching tool, obtains the friction reduction amplitude, and determines a reasonable installation position of the rotary punching tool based on the maximum reduction amplitude.

[0053] Example 2:

[0054] This embodiment is basically the same as the first embodiment, with the following special features:

[0055] In this embodiment, a method for determining a reasonable installation position of a rotary punching tool is provided, and the steps are as follows:

[0056] 1) Measure the structural parameters of the drill string: Use measuring tools to measure the outer diameter, inner diameter and length of each part of the drill string;

[0057] 2) Measuring wellbore trajectory parameters: Use measuring tools to measure wellbore trajectory parameters such as well diameter, well inclination, and azimuth;

[0058] 3) Determine the performance parameters of the rotary punching tool: Use measuring tools or the rotary punching performance parameters provided by the manufacturer to determine the operating frequency and impact force of the rotary punching tool;

[0059] 4) Establish a drill string dynamics analysis model: Provide the drill string with a pulsed axial force determined by the performance of the rotary percussion tool at the installation location:

[0060]

[0061] Where F0 is the impact force of the hammer on the anvil, kN; Δt is the contact time, s; T is the period, s; ​​t represents time, s. The time history curve of the impact action of the rotary punch tool is shown as follows: Figure 2 As shown;

[0062] In order to facilitate dynamic calculations, Fourier transform is used to transform equation (1) into a trigonometric function form:

[0063] P(t)=∑A n sin w n t (2)

[0064] The pulse form excitation F(t) is transformed by Fourier to obtain the frequency w of each order n , Hz and amplitude A n , kN, take the synthesis result of the first n order components, such as Figure 3 As shown. Substitute the Fourier series excitation into the following finite element model:

[0065]

[0066] Among them, M is the mass matrix, M Add is the additional mass matrix, C is the damping matrix, K L is the linear stiffness matrix, K NL is the nonlinear stiffness matrix, F is the external force matrix, U represents generalized acceleration, generalized velocity, and generalized displacement, respectively. The dynamic characteristics of the drill string are calculated to obtain the dynamic characteristics of the entire wellbore drill string under this excitation. The vibration parameters of each node of the drill string with stable fluctuations are taken, and the maximum axial vibration velocity of each node is sorted out to obtain the axial velocity peak distribution. At the same time, the contact force between the drill string and the wellbore wall is obtained.

[0067] 5) Calculate the reduction amplitude of the dynamic axial friction resistance of the drill string: According to Stribeck friction theory, see Figure 3 Based on the calculation results of the drill string axial velocity, the axial vibration velocity of each node of the drill string over a period of time is determined, and an appropriate friction coefficient-velocity model is determined; the axial velocity of each node of the drill string is used to obtain the reduction amplitude of the dynamic friction coefficient of each node; the average lateral contact force of each node of the drill string is determined, and the friction force reduction amplitude caused by the vibration of the rotary percussion tool at each node during stable vibration is obtained. The friction reduction amplitude of the entire drill string under the action of the rotary percussion tool is obtained by accumulating the results;

[0068] 6) Determine the rotary tool installation position corresponding to the maximum reduction amplitude: Determine the overall friction reduction amplitude of the drill string at different frequencies and different rotary tool installation positions. By comparison, determine the reasonable rotary tool installation position based on the maximum reduction amplitude.

[0069] In this embodiment, the wellbore is a vertical well, a directional well, a horizontal well, or an extended reach well. The operating frequency of the rotary percussion tool is between 5 and 200 Hz.

[0070] The method of this embodiment is a new method for determining the reasonable installation position of the rotary punch tool. The method decomposes the pulse excitation of the rotary punch tool into a multi-order sinusoidal function, determines the axial vibration velocity of each node of the drill string based on the drill string dynamics model, uses the Stribeck friction theory to obtain the dynamic friction coefficient of each node, and combines the average dynamic contact force to obtain the friction reduction amplitude of the drill string. The method of this embodiment adjusts the installation position and operating frequency of the rotary punch tool to obtain the friction reduction amplitude, and determines the reasonable installation position of the rotary punch tool based on the maximum reduction amplitude.

[0071] Example 3:

[0072] This embodiment is basically the same as the above embodiment, with the following special features:

[0073] In this example, a 3,000-meter vertical well was drilled using a dual-stabilizer drill string assembly with a Power-V tool. To reduce friction, improve the drill bit's rock-breaking capability and drilling speed, and mitigate stick-slip vibration, the method described in this patent application was used to determine the optimal installation location for the rotary percussion tool.

[0074] Implementation process:

[0075] 1) By measuring parameters such as inner diameter, outer diameter, and length, the drill tool structure is obtained as follows:

[0076] Φ333.4mm drill bit*0.4m+Φ228.6mm drill collar*18m+Φ331mm stabilizer*1.95m+Φ228.6mm drill collar*9m+Φ331mm stabilizer*1.95m+Φ228.6mm drill collar*45m+Φ203.2mm drill collar*135m+Φ139.7mm drill pipe.

[0077] The inner diameter of the drill collar is 76mm and the inner diameter of the drill pipe is 108mm.

[0078] 2) Consult the drilling design to obtain the wellbore structure:

[0079] Φ365.1mm surface casing*500m+Φ333.4mm open hole.

[0080] 3) The axial impact force of the rotary punch tool was measured to be 80 kN, and the operating frequency was between 2 and 30 Hz.

[0081] 4) The density of the drill string material was measured to be 7.9×10 3 kg / m 3 , the elastic modulus is 201GPa.

[0082] 5) The rotary percussion tool was placed at 3m, 9m, 13.5m, 24.45m, and 28.3m from the drill bit. Calculations were performed using different frequencies of 2Hz, 4Hz, 5Hz, 10Hz, and 20Hz to determine the vibration characteristics and kinetic energy index of the drill bit under different parameter combinations.

[0083] 6) High-frequency vibration of the rotary percussion tool will cause high-frequency axial movement of the nearby drill string, such as Figure 5 As shown in the figure, the axial motion velocity reaches its maximum value at the node where the rotary punch tool is installed and gradually decreases towards the sides. Under different vibration frequencies and excitation forces, when the rotary punch tool is installed at different positions, the maximum value and distribution range of the axial velocity vary significantly. Take 20Hz rotary punching as an example:

[0084] 7) Determine the coefficient of kinetic friction using the Stribeck model based on the axial velocity. Figure 5 As shown, the friction reduction effect of not installing the rotary punching tool is compared with that of installing the rotary punching tool. Figure 7 The figure shows the overall friction reduction of the drill string under the action of rotary percussion tools at different installation positions and working frequencies. It can be seen that when the rotary percussion working frequency is low, the overall friction reduction effect of the drill string is better, and the friction reduction effect corresponding to 10Hz is the worst.

[0085] 8) When the rotary percussion tool with a frequency of 20Hz is installed in different positions, the friction between the drill bit, Power-V, lower stabilizer and upper stabilizer is as follows: Figure 8The closer the rotary punch is installed to the drill bit, the better it reduces overall friction in the drill string. The farther the rotary punch is installed from the drill bit, the weaker the effect of reducing friction at the drill bit and at the Power-V.

[0086] 9) For this embodiment, the rotary punching tool (20 Hz) is preferably directly connected to the drill bit during installation, and the distance from the drill bit should be less than 5m.

[0087] The method for determining the appropriate installation position of the rotary punch tool in this embodiment is based on the measured wellbore trajectory parameters, drill string structural parameters, and rotary punch tool characteristic parameters. Different rotary punch tool installation positions are considered, and the maximum axial vibration speed of the drill string is obtained using the drill string dynamics analysis method. The dynamic axial friction reduction amplitude of the drill string is determined according to the Stribeck friction coefficient model, and the rotary punch tool position is determined based on the maximum reduction amplitude.

[0088] The above describes the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made according to the purpose of the invention. Any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principles of the technical solution of the present invention should be equivalent replacement methods. As long as they comply with the purpose of the invention and do not deviate from the technical principles and inventive concepts of the present invention, they belong to the scope of protection of the present invention.

Claims

1. A method for determining a reasonable installation position of a rotary punching tool, characterized in that: The steps are as follows: (1) Use laser measuring instruments and special gauges to measure the structural parameters of the drill string; (2) Use three-axis accelerometers, fluxgate sensors or MWD, single-point, and multi-point inclinometers to measure wellbore trajectory parameters; (3) Determine the performance parameters of the rotary punching tool; (4) Establish a drill string dynamics analysis model; (5) Calculate the reduction amplitude of the dynamic axial friction resistance of the drill string; (6) Determine the installation position of the rotary punching tool corresponding to the maximum reduction amplitude as the reasonable installation position of the rotary punching tool; In the step (4) of establishing the drill string dynamics analysis model, a pulse axial force determined by the performance of the rotary punch tool is provided to the drill string at the installation position: Where F0 is the impact force of the hammer on the anvil, kN; Δt is the contact time, s; T is the period, s; ​​t represents time, s; Convert it into the superposition excitation of the Fourier series form of the corresponding node, and the pulse form excitation F s (t) After Fourier transform, the frequency w of each order is obtained n , Hz and amplitude A n , kN, take the synthesis result of the first n-order components, and use Fourier transform to transform (1) into trigonometric function form: P(t)=∑A n sinw n t (2)。 2. The method for determining a reasonable installation position of a rotary punching tool according to claim 1, characterized in that: The step (1) of measuring the structural parameters of the drill string is: using a measuring tool to measure the outer diameter, inner diameter, length and density of the drill string.

3. The method for determining a reasonable installation position of a rotary punching tool according to claim 1, characterized in that: The step (2) measures the wellbore trajectory parameters: using a measuring tool to measure the wellbore trajectory parameters such as well diameter, well inclination and azimuth.

4. The method for determining a reasonable installation position of a rotary punching tool according to claim 1, characterized in that: The step of determining the performance parameters of the rotary punching tool is: using a measuring tool or according to the performance parameters of the rotary punching tool provided by the manufacturer, determining the working frequency and impact force of the rotary punching tool.

5. The method for determining a reasonable installation position of a rotary punching tool according to claim 1, characterized in that: In the step (4) of establishing the drill string dynamics analysis model, the excitation in the form of Fourier series is substituted into the following drill string dynamics finite element model to determine the axial vibration velocity of the drill string and the contact force between the drill string and the well wall: Among them, M is the mass matrix, M Add is the additional mass matrix, C is the damping matrix, K L is the linear stiffness matrix, K NL is the nonlinear stiffness matrix, F is the external force matrix, U are generalized acceleration, generalized velocity, and generalized displacement respectively.

6. The method for determining a reasonable installation position of a rotary punching tool according to claim 1, characterized in that: The step (5) calculates the dynamic axial friction reduction amplitude of the drill string: according to the Stribeck model and the axial vibration speed caused by the rotary percussion tool, the dynamic friction coefficient at different positions is determined, and the drill string friction reduction amplitude is calculated.

7. The method for determining a reasonable installation position of a rotary punching tool according to claim 1, characterized in that: The step (6) determines the installation position of the rotary punching tool corresponding to the maximum reduction amplitude: by changing the installation position of the rotary punching tool, the optimal installation position is determined with the maximum friction reduction amplitude as an indicator.

8. The method for determining a reasonable installation position of a rotary punching tool according to claim 1, wherein: The wellbore is a vertical well, a directional well, a horizontal well or an extended reach well.

9. The method for determining a reasonable installation position of a rotary punching tool according to claim 1, characterized in that: The operating frequency of the rotary punching tool is between 5 and 200 Hz.

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