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Vibration fatigue life prediction method for gas storage gas injection string

A vibration fatigue and life prediction technology, applied in construction and other directions, can solve problems such as affecting the safe production of gas storage, oil pipe fatigue fracture, etc., and achieve the effect of improving the prediction and monitoring mechanism and the real monitoring data.

Inactive Publication Date: 2018-11-30
南智(重庆)能源技术有限公司
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  • Abstract
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Problems solved by technology

The injection-production tubing string of the gas storage is subjected to the combined action of the additional dynamic load induced by the large-flow fluid flow, the alternating load caused by the change of the injection-production condition, and the contact load caused by the vibration of the tubing colliding with the casing, etc., and the tubing is fatigued. The risk of fracture will affect the safe production of the gas storage

Method used

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  • Vibration fatigue life prediction method for gas storage gas injection string
  • Vibration fatigue life prediction method for gas storage gas injection string

Examples

Experimental program
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Effect test

Embodiment

[0023] Analysis of the force of the fluid flowing in the pipe string on the pipe string:

[0024] Taking a gas storage as an example for analysis, the maximum inclination angle of the well is 87°, and VM80S steel grade Φ177.8mm×10.36mm tubing is used for gas injection and production. The elastic modulus of the pipe is 206GPa, the Poisson's ratio is 0.3, and the density is 7800kg / m 3 , the acceleration of gravity is 9.8m / s 2 . Considering that the gas injection medium of this well is natural gas, the relative density of natural gas is taken as 0.55g / cm 3 . Establish the flow field analysis of natural gas flowing through the changing area of ​​the tubing string section and the pressure distribution diagram of the natural gas acting on the tubing string. In the connection area of ​​two oil pipes, the absolute pressure of the fluid changes regularly. When the natural gas passes through the changing section of the tubing string, that is, the section changes suddenly, the flow ...

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Abstract

The invention discloses a vibration fatigue life prediction method for a gas storage gas injection string. The vibration fatigue life prediction method comprises the steps of analysis on string actingforce generated by flowing of a fluid in the string, analysis on the additional load generated when the fluid passes through a bent area of the string, analysis on stiffness and strength of the oil string of a natural gas well, analysis on vibrating damage to the string, and analysis on erosion damage to the buckling string. Technical support is provided for safe operation of a gas storage, and decision making of maintaining and repairing for the string of the gas well.

Description

technical field [0001] The invention specifically relates to a method for predicting the vibration fatigue life of a gas injection pipe string in a gas storage. Background technique [0002] As a peak-shaving facility in the natural gas supply system, underground gas storage is an effective means to adjust the uneven consumption of natural gas. my country began to study underground gas storage in the early 1990s, and the understanding of key scientific issues of gas storage needs to be further explored. The injection-production tubing string of the gas storage is subjected to the combined action of the additional dynamic load induced by the large-flow fluid flow, the alternating load caused by the change of the injection-production condition, and the contact load caused by the vibration of the tubing colliding with the casing, etc., and the tubing is fatigued. The risk of fracture will affect the safe production of the gas storage. The gas well string of the gas storage is...

Claims

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Application Information

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IPC IPC(8): E21B47/007
CPCE21B47/007
Inventor 黄有为
Owner 南智(重庆)能源技术有限公司
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