Longitudinal vibration suppression method for production string of high-temperature and high-pressure well

Abstract

The invention discloses a longitudinal vibration suppression method for a high-temperature and high-pressure well production string, which belongs to the technical field of oil and gas resource development and comprises the following steps: S1, acquiring longitudinal vibration characteristics of the string; s2, corresponding spring vibration reduction units and shear pins are selected; s3, the selected spring vibration reduction unit and the shear pin are assembled into an underground telescopic vibration reduction tool, and the underground telescopic vibration reduction tool is connected with a tubing string and is put into a well; s4, the tubing string stretches out and draws back under the action of fluid, the stretching length reaches a preset value, the shear pin is broken, and a stretching compensation mechanism of the underground stretching vibration reduction tool automatically compensates for the distance of the tubing string; and S5, when flow-induced vibration of the tubing string occurs, the spring vibration reduction unit works, and longitudinal vibration of the tubing string is restrained. Longitudinal vibration, caused by fluid, of the tubular column can be effectively restrained under the high-temperature and high-pressure conditions, and then efficient and stable production and operation of an oil and gas well are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of oil and gas resource development technology, and in particular to a method for suppressing longitudinal vibration of production tubing in high-temperature and high-pressure wells. Background Technology

[0002] Currently, research on tubing mechanics analysis by numerous scholars both domestically and internationally has progressed from static analysis to dynamic analysis, from linear analysis to nonlinear analysis, from considering single factors to considering the influence of multiple complex factors, and from one-dimensional problems to three-dimensional problems. Building upon this foundation, some scholars, combining fluid excitation and fluid mechanics theories, have studied the vibration mechanism induced in oil tubing during natural gas flow and have developed some basic models of flow-induced vibration in production tubing. These models can, to a certain extent, simulate and predict the flow-induced vibration of oil and gas production tubing; through simulation data, the vibration intensity of the tubing can be checked, and potential failure points can be identified.

[0003] However, the research models mentioned above do not offer effective solutions or countermeasures for the flow-induced vibration problem of tubing strings. Flow-induced vibration of production tubing strings refers to the alternating fluid forces applied to the tubing wall surface by high-pressure oil and gas flow through the inner channel of the tubing string, causing the tubing string to reciprocate. This reciprocating motion of the tubing string changes the fluid flow state, thereby altering the fluid forces acting on the inner wall of the tubing string. This type of flow-induced vibration is complex and nonlinear.

[0004] Chinese patent document CN110344819A, published on October 18, 2019, discloses a method for predicting well completion string vibration in high-temperature, high-pressure, high-yield gas wells, including the following steps: A. With the horizontal direction to the right as the x-axis and the vertical depth direction of the well as the y-axis, establish a longitudinal and transverse coupled dynamic model of the tubing string to obtain the calculation formulas for the total kinetic energy T and the total potential energy U of the tubing string; B. Based on Hamilton's principle, the differential equations for the longitudinal and transverse vibrations of the tubing are derived from the formulas for calculating the total kinetic energy T and total potential energy U of the tubing. C. Solve the differential equations for the longitudinal and transverse vibrations of the tubular column; D. Analyze the longitudinal and transverse vibration displacements, axial stress, effective load, and bending moment of the tubing using the calculation results.

[0005] The patent document discloses a method for predicting vibration of completion tubing in high-temperature, high-pressure, and high-yield gas wells. This method can obtain the stress conditions of tubing of any unit length in the completion tubing, providing theoretical support for the design, construction, and maintenance of completion tubing in high-temperature, high-pressure, and high-yield wells. However, it can only predict vibration and cannot suppress longitudinal vibration of the tubing caused by fluid under high temperature and high pressure. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a method for suppressing longitudinal vibration of the production tubing in high-temperature and high-pressure wells. The present invention can effectively suppress longitudinal vibration of the tubing caused by fluid under high temperature and high pressure conditions, thereby ensuring efficient and stable production operation of oil and gas wells.

[0007] This invention is achieved through the following technical solution: A method for suppressing longitudinal vibration of a production tubing in a high-temperature, high-pressure well, characterized by comprising the following steps: S1. The longitudinal vibration characteristics of the tubing string were obtained by using a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-pressure gas well. S2. Analyze the longitudinal vibration characteristics of the tubing string and select the corresponding spring damping unit and shear pin for the downhole telescopic vibration reduction tool. S3. Assemble the selected spring damping unit and shear pin into the downhole telescopic damping tool, connect the downhole telescopic damping tool to the tubing string and run it downhole; S4. After the tubing string is lowered into place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches the preset value, the shear pin breaks. The expansion and contraction compensation mechanism of the downhole telescopic vibration damping tool automatically compensates for the distance of the tubing string. S5. When flow-induced vibration occurs in the tubing string, the spring damping unit works to suppress the longitudinal vibration of the tubing string.

[0008] In step S1, obtaining the longitudinal vibration characteristics of the tubing string refers to collecting the engineering parameters of the target well, including wellbore trajectory, well structure, production rate and tubing string parameters, inputting the engineering parameters of the target well into the three-dimensional nonlinear flow-induced vibration model of the tubing string of the high-temperature gas well for calculation, and outputting the longitudinal vibration characteristics of the tubing string.

[0009] In step S2, the downhole telescopic vibration reduction tool includes a telescopic compensation mechanism and a spring vibration reduction unit connected to the telescopic compensation mechanism.

[0010] The telescoping compensation mechanism includes a free-travel housing and a free-travel mandrel disposed within the free-travel housing for tubing string distance compensation.

[0011] The free-travel mandrel is used for upward or downward distance compensation of the tubing string.

[0012] The spring damping unit includes a housing, a spindle, a damping spring assembly, and a rubber damping ring. The spindle has a boss, the damping spring assembly is located inside the housing, one end of the spindle extends into the housing, the damping spring assembly is mounted on the spindle, and a rubber damping ring is fitted on the spindle, with the rubber damping ring located between the boss and the housing.

[0013] The damping spring assembly can be an upper and lower combined damping spring, an inner and outer combined damping spring, or an upper and lower asymmetrical damping spring.

[0014] The applicable amplitude of the combined upper and lower damping spring is 0-50mm, and the applicable frequency is less than 10Hz.

[0015] The applicable amplitude of the combined internal and external damping spring is 0-45mm, and the applicable frequency is greater than 10Hz.

[0016] The applicable amplitude of the asymmetrical damping spring is 0-50mm, and the applicable frequency is less than 10Hz.

[0017] The beneficial effects of this invention are mainly reflected in the following aspects: 1. This invention comprises: S1. Obtaining the longitudinal vibration characteristics of the tubing string through a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-temperature, high-pressure gas well; S2. Analyzing the longitudinal vibration characteristics of the tubing string and selecting corresponding spring damping units and shear pins for the downhole telescopic vibration reduction tool; S3. Assembling the selected spring damping units and shear pins into the downhole telescopic vibration reduction tool, connecting the downhole telescopic vibration reduction tool to the tubing string, and running it downhole; S4. After the tubing string is in place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches a preset value, the shear pin breaks, and the expansion and contraction compensation mechanism of the downhole telescopic vibration reduction tool automatically compensates for the distance of the tubing string; S5. When flow-induced vibration occurs in the tubing string, the spring damping unit operates to suppress the longitudinal vibration of the tubing string. Compared with the prior art, this can effectively suppress the longitudinal vibration of the tubing string caused by fluid under high temperature and high pressure conditions, thereby ensuring the efficient and stable production operation of the oil and gas well.

[0018] 2. This invention, through the spring damping unit, can alleviate the longitudinal vibration problem of different oil tubing strings under different high temperature and high pressure conditions and different vibration characteristics, and has good applicability.

[0019] 3. The present invention provides an applicable amplitude of 0-50mm for the upper and lower combined damping springs and an applicable frequency of less than 10Hz. Different damping effects can be achieved by changing the wire diameter and lead of the springs.

[0020] 4. The applicable amplitude of the internal and external combined vibration damping spring of this invention is 0-45mm, and the applicable frequency is greater than 10Hz. When the vibration characteristics of the target well exhibit high-frequency non-uniform vibration, it can effectively suppress the longitudinal vibration of the tubing string with a wide distribution of vibration characteristics.

[0021] 5. The present invention provides an applicable amplitude of 0-50mm for the upper and lower asymmetrical damping springs, an applicable frequency of less than 10Hz, and is suitable for damping when the target well experiences upper and lower asymmetrical vibration.

[0022] 6. This invention, by suppressing the longitudinal vibration of the tubing string under high temperature and high pressure, can avoid tubing string damage and failure caused by downhole flow-induced vibration, thereby improving the overall production efficiency of oil and gas wells. Attached Figure Description

[0023] The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the structure of the downhole telescopic vibration reduction tool of the present invention; The markings in the diagram are: 1. Telescopic compensation mechanism, 2. Spring damping unit, 3. Free travel housing, 4. Free travel spindle, 5. Housing, 6. Spindle, 7. Damping spring assembly, 8. Rubber damping ring. Detailed Implementation

[0024] Example 1 See Figure 1 A method for suppressing longitudinal vibration of a high-temperature, high-pressure well production string includes the following steps: S1. The longitudinal vibration characteristics of the tubing string were obtained by using a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-pressure gas well. S2. Analyze the longitudinal vibration characteristics of the tubing string and select the corresponding spring damping unit 2 and shear pin for the downhole telescopic vibration reduction tool; S3. Assemble the selected spring damping unit 2 and shear pin into the downhole telescopic damping tool, connect the downhole telescopic damping tool to the tubing string and run it downhole; S4. After the tubing string is lowered into place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches the preset value, the shear pin breaks. The expansion and contraction compensation mechanism 1 of the downhole expansion and contraction damping tool automatically compensates for the distance of the tubing string. S5. When flow-induced vibration occurs in the tubing string, the spring damping unit 2 works to suppress the longitudinal vibration of the tubing string.

[0025] This embodiment is the most basic implementation method. S1, the longitudinal vibration characteristics of the tubing string are obtained through a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-temperature, high-pressure gas well. S2, the longitudinal vibration characteristics of the tubing string are analyzed, and corresponding spring damping units 2 and shear pins are selected for the downhole telescopic vibration damping tool. S3, the selected spring damping units 2 and shear pins are assembled into the downhole telescopic vibration damping tool, and the downhole telescopic vibration damping tool is connected to the tubing string and run downhole. S4, after the tubing string is run into place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches the preset value, the shear pin breaks, and the expansion and contraction compensation mechanism 1 of the downhole telescopic vibration damping tool automatically compensates for the distance of the tubing string. S5, when the tubing string experiences flow-induced vibration, the spring damping unit 2 works to suppress the longitudinal vibration of the tubing string. Compared with the prior art, this can effectively suppress the longitudinal vibration of the tubing string caused by fluid under high temperature and high pressure conditions, thereby ensuring the efficient and stable production operation of the oil and gas well.

[0026] Example 2 See Figure 1 A method for suppressing longitudinal vibration of a high-temperature, high-pressure well production string includes the following steps: S1. The longitudinal vibration characteristics of the tubing string were obtained by using a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-pressure gas well. S2. Analyze the longitudinal vibration characteristics of the tubing string and select the corresponding spring damping unit 2 and shear pin for the downhole telescopic vibration reduction tool; S3. Assemble the selected spring damping unit 2 and shear pin into the downhole telescopic damping tool, connect the downhole telescopic damping tool to the tubing string and run it downhole; S4. After the tubing string is lowered into place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches the preset value, the shear pin breaks. The expansion and contraction compensation mechanism 1 of the downhole expansion and contraction damping tool automatically compensates for the distance of the tubing string. S5. When flow-induced vibration occurs in the tubing string, the spring damping unit 2 works to suppress the longitudinal vibration of the tubing string.

[0027] Preferably, in step S1, obtaining the longitudinal vibration characteristics of the tubing string refers to collecting the engineering parameters of the target well, including wellbore trajectory, well structure, production rate and tubing string parameters, inputting the engineering parameters of the target well into the three-dimensional nonlinear flow-induced vibration model of the tubing string of the high-temperature gas well for calculation, and outputting the longitudinal vibration characteristics of the tubing string.

[0028] In step S2, the downhole telescopic vibration reduction tool includes a telescopic compensation mechanism 1 and a spring vibration reduction unit 2 connected to the telescopic compensation mechanism 1.

[0029] This embodiment is a preferred implementation. The spring damping unit 2 can alleviate the longitudinal vibration problem of different tubing strings under different high temperature and high pressure and different vibration characteristics, and has good applicability.

[0030] Example 3 See Figure 1 A method for suppressing longitudinal vibration of a high-temperature, high-pressure well production string includes the following steps: S1. The longitudinal vibration characteristics of the tubing string were obtained by using a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-pressure gas well. S2. Analyze the longitudinal vibration characteristics of the tubing string and select the corresponding spring damping unit 2 and shear pin for the downhole telescopic vibration reduction tool; S3. Assemble the selected spring damping unit 2 and shear pin into the downhole telescopic damping tool, connect the downhole telescopic damping tool to the tubing string and run it downhole; S4. After the tubing string is lowered into place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches the preset value, the shear pin breaks. The expansion and contraction compensation mechanism 1 of the downhole expansion and contraction damping tool automatically compensates for the distance of the tubing string. S5. When flow-induced vibration occurs in the tubing string, the spring damping unit 2 works to suppress the longitudinal vibration of the tubing string.

[0031] In step S1, obtaining the longitudinal vibration characteristics of the tubing string refers to collecting the engineering parameters of the target well, including wellbore trajectory, well structure, production rate and tubing string parameters, inputting the engineering parameters of the target well into the three-dimensional nonlinear flow-induced vibration model of the tubing string of the high-temperature gas well for calculation, and outputting the longitudinal vibration characteristics of the tubing string.

[0032] In step S2, the downhole telescopic vibration reduction tool includes a telescopic compensation mechanism 1 and a spring vibration reduction unit 2 connected to the telescopic compensation mechanism 1.

[0033] More preferably, the telescopic compensation mechanism 1 includes a free travel housing 3 and a free travel mandrel 4 disposed within the free travel housing 3 for tubing string distance compensation.

[0034] The free travel mandrel 4 is used for upward or downward distance compensation of the tubing string.

[0035] The spring damping unit 2 includes a housing 5, a spindle 6, a damping spring assembly 7, and a rubber damping ring 8. A boss is provided on the spindle 6. The damping spring assembly 7 is located inside the housing 5. One end of the spindle 6 extends into the housing 5. The damping spring assembly 7 is installed on the spindle 6. A rubber damping ring 8 is sleeved on the spindle 6. The rubber damping ring 8 is located between the boss and the housing 5.

[0036] The damping spring assembly 7 is an upper and lower combined damping spring.

[0037] The applicable amplitude of the combined upper and lower damping spring is 0-50mm, and the applicable frequency is less than 10Hz.

[0038] This embodiment is another preferred implementation. The applicable amplitude of the upper and lower combined damping spring is 0-50mm, and the applicable frequency is less than 10Hz. Different damping effects can be achieved by changing the wire diameter and lead of the spring.

[0039] Example 4 See Figure 1 A method for suppressing longitudinal vibration of a high-temperature, high-pressure well production string includes the following steps: S1. The longitudinal vibration characteristics of the tubing string were obtained by using a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-pressure gas well. S2. Analyze the longitudinal vibration characteristics of the tubing string and select the corresponding spring damping unit 2 and shear pin for the downhole telescopic vibration reduction tool; S3. Assemble the selected spring damping unit 2 and shear pin into the downhole telescopic damping tool, connect the downhole telescopic damping tool to the tubing string and run it downhole; S4. After the tubing string is lowered into place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches the preset value, the shear pin breaks. The expansion and contraction compensation mechanism 1 of the downhole expansion and contraction damping tool automatically compensates for the distance of the tubing string. S5. When flow-induced vibration occurs in the tubing string, the spring damping unit 2 works to suppress the longitudinal vibration of the tubing string.

[0040] In step S1, obtaining the longitudinal vibration characteristics of the tubing string refers to collecting the engineering parameters of the target well, including wellbore trajectory, well structure, production rate and tubing string parameters, inputting the engineering parameters of the target well into the three-dimensional nonlinear flow-induced vibration model of the tubing string of the high-temperature gas well for calculation, and outputting the longitudinal vibration characteristics of the tubing string.

[0041] In step S2, the downhole telescopic vibration reduction tool includes a telescopic compensation mechanism 1 and a spring vibration reduction unit 2 connected to the telescopic compensation mechanism 1.

[0042] The telescopic compensation mechanism 1 includes a free travel housing 3 and a free travel mandrel 4 for tubing string distance compensation, which is disposed inside the free travel housing 3.

[0043] The free travel mandrel 4 is used for upward or downward distance compensation of the tubing string.

[0044] The spring damping unit 2 includes a housing 5, a spindle 6, a damping spring assembly 7, and a rubber damping ring 8. A boss is provided on the spindle 6. The damping spring assembly 7 is located inside the housing 5. One end of the spindle 6 extends into the housing 5. The damping spring assembly 7 is installed on the spindle 6. A rubber damping ring 8 is sleeved on the spindle 6. The rubber damping ring 8 is located between the boss and the housing 5.

[0045] The damping spring assembly 7 is an internal and external combined damping spring.

[0046] The applicable amplitude of the combined internal and external damping spring is 0-45mm, and the applicable frequency is greater than 10Hz.

[0047] This embodiment is another preferred implementation. The applicable amplitude of the internal and external combined vibration damping spring is 0-45mm, and the applicable frequency is greater than 10Hz. When the vibration characteristics of the target well exhibit high-frequency non-uniform vibration, it can effectively suppress the longitudinal vibration of the tubing string with a wide distribution of vibration characteristics.

[0048] Example 5 See Figure 1 A method for suppressing longitudinal vibration of a high-temperature, high-pressure well production string includes the following steps: S1. The longitudinal vibration characteristics of the tubing string were obtained by using a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-pressure gas well. S2. Analyze the longitudinal vibration characteristics of the tubing string and select the corresponding spring damping unit 2 and shear pin for the downhole telescopic vibration reduction tool; S3. Assemble the selected spring damping unit 2 and shear pin into the downhole telescopic damping tool, connect the downhole telescopic damping tool to the tubing string and run it downhole; S4. After the tubing string is lowered into place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches the preset value, the shear pin breaks. The expansion and contraction compensation mechanism 1 of the downhole expansion and contraction damping tool automatically compensates for the distance of the tubing string. S5. When flow-induced vibration occurs in the tubing string, the spring damping unit 2 works to suppress the longitudinal vibration of the tubing string.

[0049] In step S1, obtaining the longitudinal vibration characteristics of the tubing string refers to collecting the engineering parameters of the target well, including wellbore trajectory, well structure, production rate and tubing string parameters, inputting the engineering parameters of the target well into the three-dimensional nonlinear flow-induced vibration model of the tubing string of the high-temperature gas well for calculation, and outputting the longitudinal vibration characteristics of the tubing string.

[0050] In step S2, the downhole telescopic vibration reduction tool includes a telescopic compensation mechanism 1 and a spring vibration reduction unit 2 connected to the telescopic compensation mechanism 1.

[0051] The telescopic compensation mechanism 1 includes a free travel housing 3 and a free travel mandrel 4 for tubing string distance compensation, which is disposed inside the free travel housing 3.

[0052] The free travel mandrel 4 is used for upward or downward distance compensation of the tubing string.

[0053] More preferably, the spring damping unit 2 includes a housing 5, a spindle 6, a damping spring assembly 7, and a rubber damping ring 8. The spindle 6 is provided with a boss, the damping spring assembly 7 is located inside the housing 5, one end of the spindle 6 extends into the housing 5, the damping spring assembly 7 is mounted on the spindle 6, and the rubber damping ring 8 is sleeved on the spindle 6. The rubber damping ring 8 is located between the boss and the housing 5.

[0054] The damping spring group 7 is an asymmetrical damping spring.

[0055] The applicable amplitude of the asymmetrical damping spring is 0-50mm, and the applicable frequency is less than 10Hz.

[0056] This embodiment is the best implementation method. The applicable amplitude of the upper and lower asymmetrical damping spring is 0-50mm, and the applicable frequency is less than 10Hz. It is suitable for damping when the target well experiences upper and lower asymmetrical vibration.

[0057] By suppressing the longitudinal vibration of the tubing string under high temperature and high pressure, it is possible to avoid tubing string damage and failure caused by downhole flow-induced vibration, thereby improving the overall production efficiency of oil and gas wells.

[0058] The basic principle of this invention is as follows: The three-dimensional nonlinear flow-induced vibration model of the tubing string in high-temperature, high-pressure, and high-yield gas wells described in this invention is an existing technology. See the Journal of Vibration Engineering, No. 4, 2022.

[0059] First, a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-pressure gas well is used to simulate and predict the vibration characteristics of the tubing string. Then, according to the vibration characteristics of the tubing string, a vibration damping spring unit is configured for the downhole telescopic vibration damping tool. Finally, the downhole telescopic vibration damping tool is run in to reduce the longitudinal vibration of the tubing string. When the longitudinal vibration of the tubing string is suppressed, the additional load on the tubing string will be reduced, thereby reducing the risk of fatigue failure of the tubing string and ensuring the efficient and stable production operation of the oil and gas well.

[0060] The invention will now be illustrated with specific examples: Well A1H is a horizontal well in a high-temperature, high-pressure gas field. The vertical section is 1500m, the upper build-up section is 120m, and the stabilization section extends to 2520m at an inclination angle of 12.74°, before being built up again to the packer position at 3500m. The coordinates are positive vertically downwards and horizontally to the right. The upper end of the tubing string is the tubing hanger. In the three-dimensional nonlinear flow-induced vibration model calculation for high-temperature, high-pressure gas wells, the tubing string is considered a fixed end. The production packer is located at a depth of 3045m, and the middle packer is located at 3500m of the tubing; both are set as fixed ends in the calculation and analysis.

[0061] A three-dimensional nonlinear flow-induced vibration model of the tubing string in the A1H gas well was used to calculate the vibration displacement data of the tubing string in different well sections, as well as the amplitude-frequency response curves. Vibration was monitored at four locations in the A1H gas well under different production rates: the vibration displacements at 700m, 1400m, and 2100m were relatively similar, while the vibration displacement at 2800m was larger and more uneven, exhibiting greater fluctuations. The amplitude-frequency curves showed that the vibration frequency distribution was relatively wide above 2100m, while the vibration frequency was more concentrated at 2800m. The overall vibration frequency of the tubing string was mainly concentrated in the 0-5Hz range.

[0062] Based on the vibration characteristics calculated from the three-dimensional nonlinear flow-induced vibration model of the tubing string in the high-pressure gas well, vibration damping spring units were selected for the downhole telescopic vibration damping tool, as shown in Table 1.

[0063] Table 1 serial number wire diameter outer diameter Free length Material Vibration damping spring unit Remark 1 12 55 45 50CrVA Upper and lower combination damping springs 700-1400m well section 2 12 55 45 50CrVA Upper and lower combination damping springs 1400-2800m well section 3 11 / 12 55 48 50CrVA Asymmetrical damping springs Between the first packer and the second packer 4 11 / 12 55 48 50CrVA Asymmetrical damping springs Below the second packer By selecting the vibration damping spring unit, the longitudinal vibration of the tubing string can be effectively reduced, ensuring efficient and stable production of the A1H gas well.

Claims

1. A method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing, characterized in that, Includes the following steps: S1. The longitudinal vibration characteristics of the tubing string were obtained by using a three-dimensional nonlinear flow-induced vibration model of the tubing string in a high-pressure gas well. S2. Analyze the longitudinal vibration characteristics of the tubing string and select the corresponding spring damping unit (2) and shear pin for the downhole telescopic vibration reduction tool; S3. Assemble the selected spring damping unit (2) and shear pin into the downhole telescopic damping tool, connect the downhole telescopic damping tool to the tubing string and run it downhole; S4. After the tubing string is lowered into place and the packer is seated, production begins. The tubing string expands and contracts under the action of fluid. When the expansion and contraction length reaches the preset value, the shear pin breaks. The expansion and contraction compensation mechanism of the downhole expansion and contraction damping tool (1) automatically compensates for the distance of the tubing string. S5. When flow-induced vibration occurs in the tubing string, the spring damping unit (2) works to suppress the longitudinal vibration of the tubing string.

2. The method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 1, characterized in that: In step S1, obtaining the longitudinal vibration characteristics of the tubing string refers to collecting the engineering parameters of the target well, including wellbore trajectory, well structure, production rate and tubing string parameters, inputting the engineering parameters of the target well into the three-dimensional nonlinear flow-induced vibration model of the tubing string of the high-temperature gas well for calculation, and outputting the longitudinal vibration characteristics of the tubing string.

3. The method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 1, characterized in that: In step S2, the downhole telescopic vibration reduction tool includes a telescopic compensation mechanism (1) and a spring vibration reduction unit (2) connected to the telescopic compensation mechanism (1).

4. The method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 1, characterized in that: In step S4, the telescopic compensation mechanism (1) includes a free travel housing (3) and a free travel mandrel (4) for tubing string distance compensation disposed in the free travel housing (3).

5. The method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 4, characterized in that: The free travel mandrel (4) is used for upward or downward distance compensation of the tubing string.

6. The method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 1, characterized in that: In step S2, the spring damping unit (2) includes a housing (5), a spindle (6), a damping spring assembly (7), and a rubber damping ring (8). The spindle (6) is provided with a boss. The damping spring assembly (7) is located inside the housing (5). One end of the spindle (6) extends into the housing (5). The damping spring assembly (7) is installed on the spindle (6). The rubber damping ring (8) is sleeved on the spindle (6). The rubber damping ring (8) is located between the boss and the housing (5).

7. The method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 6, characterized in that: The damping spring assembly (7) is an upper and lower combined damping spring, an inner and outer combined damping spring, or an upper and lower asymmetrical damping spring.

8. The method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 7, characterized in that: The applicable amplitude of the combined upper and lower damping spring is 0-50mm, and the applicable frequency is less than 10Hz.

9. A method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 7, characterized in that: The applicable amplitude of the combined internal and external damping spring is 0-45mm, and the applicable frequency is greater than 10Hz.

10. A method for suppressing longitudinal vibration of a high-temperature, high-pressure well production tubing according to claim 7, characterized in that: The applicable amplitude of the asymmetrical damping spring is 0-50mm, and the applicable frequency is less than 10Hz.

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