摘要
页岩气开发采用水平井多段体积压裂工艺,压裂压力高达100 MPa以上。生产管柱采用高钢级厚壁特殊螺纹接箍式连接套管。接箍冲击功执行API SPEC 5CT《套管和油管规范》标准规定,在高内压压裂时接箍易发生开裂。本文通过对1口页岩气开发井生产套管试压过程中外螺纹脱扣失效分析,揭示了API SPEC 5CT标准规定只是针对API螺纹连接形式,没有考虑特殊螺纹连接的台肩效应。特殊螺纹接箍冲击功,需依据螺纹结构形式和适用的井下工况载荷确定。
The horizontal well and multistage hydraulic fracturing was used on shale gas development, and the fracturing pressure was more than 100MPa. The high grade, thick wall, premium connection T＆C casing was used in production string. Calculating coupling impact ener- gy according to the standard of API 5CT casing and tubing, coupling was prone to cracking on high internal pressure fracturing. In this pa- per,through failure analysis on production casing pin dropout in one development well of shale gas, which the API 5CT standard only fit for API connection form but didn＇ t take into account the premium connection shoulder effect was revealed. The premium connection coupling impact energy was determined by the thread structure and applicable condition of load.
出处
《石油管材与仪器》
2016年第2期47-52,共6页
Petroleum Tubular Goods & Instruments
关键词
生产套管
特殊螺纹
接箍
冲击功
production easing
premium connection
coupling
impact energy
