摘要
高温高压高含硫气井当前已经形成了基于两级完整性屏障分析的气井完整性评价方法,该方法将井完整性屏障评价分为一级井屏障和二级井屏障,通过孤立的分析各级屏障部件服役状况来确定气井完整性状况,但针对大量非三高气井的完整性评价,直接采用两级屏障分析方法获取的井完整性评价结论过于保守,因为单一的屏障部件削弱和失效并不会导致井筒流体不受控制的进入地表或大气。因此,文章引入一种全新的井完整性分析方法。该方法将气井完整性屏障作为一个不可分割的整体进行系统可靠性分析,通过引入事件树分析方法,对井屏障系统进行泄漏路径识别,构造事件树及系统逻辑框图,分析各个泄漏路径上各级完整性屏障部件的失效概率,并依据系统逻辑框图定量计算气井井屏障系统发生失效的可能性。
A two-stage integrity barrier analysis method has been developed to evaluate the integrity of gas wells in high temperature,high pressure and high sulfur gas wells.This method divides the evaluation of well integrity barrier into first-stage barrier and second-stage barrier.It is too conservative to use the two-stage barrier analysis method directly to evaluate the integrity of non-three-high gas wells,because the weakening and failure of a single barrier component will not lead to uncontrolled entry of wellbore fluids into the surface or atmosphere.Therefore,a new method of well integrity analysis is introduced in this paper.The method uses gas well integrity barrier as an inseparable system for reliability analysis.By introducing the event tree analysis method,the leakage path of the well barrier system is identified,the event tree and the system logic block diagram are constructed,the failure probability of the integrity barrier components at all levels on each leakage path is analyzed,and the failure probability of the gas well barrier system is calculated quantitatively according to the system logic block diagram.
作者
刘祥康
汪传磊
周浪
陈奎
余曼
张林
LIU Xiangkang;WANG Chuanlei;ZHOU Lang;CHEN Kui;YU Man;ZHANG Lin(Engineering Technology Research Institute of Petrochina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610000,China)
出处
《钻采工艺》
CAS
北大核心
2020年第4期31-34,I0002,I0003,共6页
Drilling & Production Technology
基金
中国石油集团公司重大专项“西南油气田上产300亿方勘探开发关键技术研究与应用”之课题6“川中地区灯四气藏规模有效开发关键技术研究与应用”(编号:2016E-0606)
西南油气田公司重大专项“川东地区天然气勘探开发关键技术研究与应用”(编号:2016ZD01)。
关键词
事件树
井完整性屏障
定量分析
泄漏路径
event tree
well integrity barrier
quantitative analysis
leakage path
