西南石油大学学报(自然科学版)

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Research on Vibration Damage of Completion String in Yolotan#br# High-yield Gas Well

YANG Mingjun1, LI Haitao1*, JIANG Rui1, XIAO Kaiwen2, XIE Jiang3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. CNOOC Research Institute,Chaoyang,Beijing 100028,China
    3. Petroleum Production Engineering Institute of Huabei Oilfield,PetroChina,Renqiu,Hebei 062552,China
  • Online:2016-02-01 Published:2016-02-01

Abstract:

Yolotan gas field is characterized by high temperature and high pressure gas field. The high-speed gas flow in tubing
may cause erosion damage to the string,and the erosion seriously threats the security of gas production and operation. The
tubing string with packers tends to be buckled,making the fatigue wear more damaging,which is prone to cause downhole
string deformation or damage. Therefore,it is of great significance to study vibration damage and to predict fatigue life of
tubing string. We established finite element vibration model of pipe string with packer in high-yield gas wells by ANSYS. The
results of analysis of the tubing string vibration analysis show that the farther away the pipe string is from the packer the greater
the amplitude of vibration displacement,velocity and acceleration. With detail studies on axial stress,buckling damage and
neutral point changes of the whole sections of the tubing string,and analysis of the contact pressure changes over time between
buckling string and casing string in different locations and different production,this study provides quantitative data for studies
on friction and wear damage mechanism. Finally,we predict the fatigue life of string,which provides theoretical basis for
putting forward string vibration damage prevention measures.

Key words: completion pipe string, vibration analysis, buckling damage, friction damage, life prediction

CLC Number: