CN-121993544-A - Longitudinal vibration suppression method for production string of high-temperature high-pressure well

CN121993544ACN 121993544 ACN121993544 ACN 121993544ACN-121993544-A

Abstract

The invention discloses a method for restraining longitudinal vibration of a production string of a high-temperature high-pressure well, which belongs to the technical field of oil and gas resource development and comprises the following steps of S1, obtaining longitudinal vibration characteristics of a tubing string, S2, selecting a corresponding spring vibration reduction unit and a shearing pin, S3, assembling the selected spring vibration reduction unit and the shearing pin into an underground telescopic vibration reduction tool, connecting the underground telescopic vibration reduction tool with the tubing string and descending the underground telescopic vibration reduction tool into the well, S4, enabling the tubing string to expand and contract under the action of fluid, enabling the expansion length to reach a preset value, enabling the shearing pin to break, enabling an expansion compensation mechanism of the underground telescopic vibration reduction tool to automatically compensate the distance of the tubing string, and S5, enabling the spring vibration reduction unit to work when the string vibration caused by flow occurs, and restraining the longitudinal vibration of the tubing string. According to the invention, the longitudinal vibration of the pipe column caused by the fluid under the condition of high temperature and high pressure can be effectively restrained, so that the efficient and stable production operation of the oil-gas well is ensured.

Inventors

ZHANG WENBIN
XIE SHENG
ZHANG MINGYOU
ZHANG PING
ZENG XIAOJUN
ZENG LU
HUANG CHUAN
XU YUDONG
LIU SONG
HAN TING

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. The method for restraining the longitudinal vibration of the production string of the high-temperature high-pressure well is characterized by comprising the following steps of: S1, acquiring longitudinal vibration characteristics of a tubing string of a three-high gas well through a three-dimensional nonlinear flow induced vibration model of the tubing string; s2, analyzing longitudinal vibration characteristics of the tubing string, and selecting a corresponding spring vibration reduction unit (2) and a shearing pin for the downhole telescopic vibration reduction tool; S3, assembling the selected spring vibration reduction unit (2) and the shearing pin into an underground telescopic vibration reduction tool, connecting the underground telescopic vibration reduction tool with a tubing string, and descending the tubing string into the underground; S4, after the tubing string is put in place and the packer is set, starting production, enabling the tubing string to stretch under the action of fluid, enabling the stretch length to reach a preset value, enabling the shearing pin to be broken, and enabling a stretch compensation mechanism (1) of the underground stretch vibration damping tool to automatically compensate the distance of the tubing string; And S5, when the vibration caused by the pipe column flow occurs, the spring vibration reduction unit (2) works to restrain the longitudinal vibration of the oil pipe column.
2. The method for suppressing longitudinal vibration of a production string of a high temperature and high pressure well according to claim 1, wherein in the step S1, obtaining the longitudinal vibration characteristic of the tubing string means collecting engineering parameters of a target well, including a wellbore track, a well body structure, a yield and tubing string parameters, inputting the engineering parameters of the target well into a three-dimensional nonlinear flow induced vibration model of the tubing string of the three-high pressure gas well for calculation, and outputting the longitudinal vibration characteristic of the tubing string.
3. The method for suppressing longitudinal vibration of a production string of a high temperature and high pressure well according to claim 1, wherein in the step S2, the downhole telescopic vibration suppressing tool comprises a telescopic compensation mechanism (1) and a spring vibration suppressing unit (2) connected with the telescopic compensation mechanism (1).
4. The method for suppressing longitudinal vibration of a production string of a high temperature and high pressure well according to claim 1, wherein in the step S4, the telescopic compensation mechanism (1) comprises a free travel housing (3) and a free travel mandrel (4) for tubing string distance compensation arranged in the free travel housing (3).
5. The method for restraining longitudinal vibration of production string of high-temperature and high-pressure well according to claim 4, wherein the free travel mandrel (4) is used for tubing string upward distance compensation or tubing string downward distance compensation.
6. The method for suppressing longitudinal vibration of a production string of a high-temperature high-pressure well according to claim 1, wherein in the step S2, the spring vibration suppressing unit (2) comprises a shell (5), a mandrel (6), a vibration suppressing spring set (7) and a rubber vibration suppressing ring (8), a boss is arranged on the mandrel (6), the vibration suppressing spring set (7) is located in the shell (5), one end of the mandrel (6) extends into the shell (5), the vibration suppressing spring set (7) is mounted on the mandrel (6), the rubber vibration suppressing ring (8) is sleeved on the mandrel (6), and the rubber vibration suppressing ring (8) is located between the boss and the shell (5).
7. The method for restraining longitudinal vibration of a production string of a high-temperature high-pressure well according to claim 6, wherein the vibration damping spring group (7) is an upper and lower combined vibration damping spring, an inner and outer combined vibration damping spring or an upper and lower asymmetric vibration damping spring.
8. The method for suppressing longitudinal vibration of a production string of a high-temperature and high-pressure well as claimed in claim 7, wherein the upper and lower combined damping springs have an applicable amplitude of 0-50mm and an applicable frequency of less than 10Hz.
9. The method for suppressing longitudinal vibration of a production string of a high-temperature and high-pressure well as claimed in claim 7, wherein the applicable amplitude of the inner and outer combined damping springs is 0-45mm, and the applicable frequency is more than 10Hz.
10. The method for suppressing longitudinal vibration of a production string of a high-temperature and high-pressure well as claimed in claim 7, wherein the upper and lower asymmetric damping springs have an applicable amplitude of 0-50mm and an applicable frequency of less than 10Hz.

Description

Longitudinal vibration suppression method for production string of high-temperature high-pressure well Technical Field The invention relates to the technical field of oil and gas resource development, in particular to a method for restraining longitudinal vibration of a production string of a high-temperature high-pressure well. Background At present, a plurality of scholars at home and abroad conduct the development processes from statics analysis to dynamics analysis, linear analysis to nonlinear analysis, single factor to compound multi-factor influence, and one-dimensional problem to three-dimensional problem on the basis, and on the basis, part of scholars combine fluid excitation and fluid mechanics theory to research the mechanism of inducing the vibration of the tubing string in the process of natural gas flowing in the tubing string, and form basic models of flow induced vibration of the production string. The model can simulate and predict the flow-induced vibration of the oil and gas production pipe column to a certain extent, and can check the vibration intensity of the pipe column through simulation data and find out failure risk points of the pipe column. However, the above research model does not provide an effective solution and countermeasure to the flow induced vibration problem of the pipe string. The flow induced vibration of the production string refers to that when high-pressure oil airflow flows through a channel in the tubing string, alternating fluid force is applied to the surface of the tubing wall, so that the tubing string reciprocates, and the reciprocation of the tubing string changes the fluid state, so that the fluid force acting on the inner wall of the tubing string is changed, and the flow induced vibration is complex and nonlinear. The Chinese patent literature with publication number CN110344819A and publication date 2019, 10 months and 18 days discloses a method for predicting vibration of a completion string of a high-temperature high-pressure high-yield gas well, which comprises the following steps: A. Taking the horizontal right as an x axis and the vertical depth direction as a y axis, and establishing a longitudinal and transverse coupling dynamics model of the pipe column to obtain a calculation formula of total kinetic energy T and total potential energy U of the pipe column; B. according to the Hamiltonian principle, a longitudinal vibration differential equation and a transverse vibration differential equation of the pipe column are deduced through calculation of total kinetic energy T and total potential energy U of the pipe column; C. Solving a longitudinal vibration differential equation and a transverse vibration differential equation of the pipe column; D. And analyzing the longitudinal and transverse vibration displacement, the axial stress, the effective load and the bending moment of the pipe column by using the calculation result. The vibration prediction method for the completion pipe string of the high-temperature high-pressure high-yield gas well disclosed by the patent document can obtain the stress condition of the pipe string with any unit length in the completion pipe string, and can provide theoretical support for the design, construction and maintenance of the completion pipe string of the high-temperature high-pressure high-yield gas well. However, only vibration prediction is possible, and longitudinal vibration of the column due to the fluid at high temperature and high pressure cannot be suppressed. Disclosure of Invention In order to overcome the defects of the prior art, the invention provides the method for inhibiting the longitudinal vibration of the production string of the high-temperature high-pressure well, which can effectively inhibit the longitudinal vibration of the string caused by fluid under the condition of high temperature and high pressure, thereby ensuring the efficient and stable production operation of an oil-gas well. The invention is realized by the following technical scheme: The method for restraining the longitudinal vibration of the production string of the high-temperature high-pressure well is characterized by comprising the following steps of: S1, acquiring longitudinal vibration characteristics of a tubing string of a three-high gas well through a three-dimensional nonlinear flow induced vibration model of the tubing string; s2, analyzing the longitudinal vibration characteristics of the tubing string, and selecting a corresponding spring vibration reduction unit and a corresponding shear pin for the downhole telescopic vibration reduction tool; s3, assembling the selected spring vibration reduction unit and the shearing pin into an underground telescopic vibration reduction tool, connecting the underground telescopic vibration reduction tool with a tubing string, and descending the tubing string into the underground; s4, after the tubing string is put in place and the packer is set, starting production, ena