石油钻采工艺2017，Vol.39Issue(3)：288-292,5.DOI:10.13639/j.odpt.2017.03.006
高温高压井双封隔器管柱安全评估
Safety assessment on twin-packer string of HTHP well
摘要
Abstract
After HTHP (high temperature and high pressure) oil and gas wells are put into production, the fluid medium in the closed space of twin packer of completion string is thermally expanded due to the effect of high temperature reservoir fluids, and leads to confined pressure building. As a result, the tubing may be collapsed and the production casing may be damaged, doing serious harm to string service life and wellbore integrity. To deal with the safe production problems caused by the increasing of pressure in closed space, the coupling mechanism between borehole and strata under the effect of temperature load was analyzed by using the theories of elasticity and thermal conduction. Then, the relationships of string displacement deformation at free tubing and cemented production casing vs. temperature and pressure were investigated. Finally, a pressure prediction model for the closed space of twin packer was established. Meanwhile, the safety performance of packer string in different working conditions was checked and analyzed. It is indicated in the stage of flowing production, the annulus pressure increases with the spacing of twin packer and the safety of strings is not impacted. In the stage of completion fluid circulation, the annulus pressure decreases with the increasing of twin packer spacing if the extreme work-ing condition is taken into consideration, but it is always higher than the internal pressure strength of production casing. Therefore, the packer shall not be set at once and its setting shall be performed after a while so as to ensure the safety of strings.关键词
完井/高温高压/套管强度/安全校核/双封隔器/圈闭环空压力Key words
well completion/high temperature and high pressure/casing strength/safety check/twin packer/annulus pressure of trap分类
能源科技引用本文复制引用
胡志强,杨进,李中,李文龙,顾岳,李舒展..高温高压井双封隔器管柱安全评估[J].石油钻采工艺,2017,39(3):288-292,5.基金项目
国家自然科学基金"海洋深水浅层钻井关键技术基础理论研究"(编号:51434009) （编号:51434009）
国家科技重大专项"浅层地质灾害识别与风险评价技术研究"(编号:2016ZX05033004-005) （编号:2016ZX05033004-005）
国家自然科学创新研究群体项目"复杂油气井钻井与完井基础研究"(编号:51221003). （编号:51221003）
