Open AccessSealing Performance Optimization of High Temperature Resistant Steam Sealing Thread of Casing in Heavy Oil Thermal Recovery Well in Xinjiang Oilfield
Author(s) -
Lin Song,
Xuegang Wang,
Yanxian Wu,
Shouming Zhong,
Wenfeng Yin
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/782/4/042025
Subject(s) - thread (computing) , casing , conical surface , petroleum engineering , materials science , thermal , mechanical engineering , composite material , engineering , physics , meteorology
API trapezoidal thread can not adapt to the high temperature environment of heavy oil thermal recovery in Xinjiang Oilfield. Serious casing damage occured due to leakage of API trapezoidal thread leakage. In this paper, based on API trapezoid thread structure, a sealing structure with conical surface and shoulder surface were added at the end of the thread. Therefore, a high temperature resistant steam sealing thread (HTRSS thread) suitable for heavy oil thermal recovery well was designed. The influence of the taper of the conical surface and the angle of the shoulder surface on the sealing performance of the thread was analyzed by the finite element method. The sealing structure with the taper of the conical surface of 1/16 and the angle of the shoulder of 10° was optimized. By comparing with the sealing performance of API trapezoid thread and field application, it is verified that the HTRSS thread has excellent sealing performance. The application of the HTRSS thread can effectively reduce the casing damage rate of heavy oil thermal recovery wells and save the heavy oil production cost.