克深气田油套窜通高压气井安全生产的思路及措施

Measures on safety production for gas well with the oil tubing-first casing cross flow in Keshen gas field

在高压、高温油气井的生产阶段,环空异常持续带压将直接影响到气井和现场作业人员的安全,其中以油套窜通的类型最为严重。针对克深气田12口油套窜通高压气井的生产现状,分析了油套窜通给安全生产带来的突出问题,结合油套窜通高压气井所表现出的环空压力异常现象,根据其产量、油套连通性、关井井口压力及环空最大许可工作压力的关系对这类井进行分类分级管理,提出了安全生产的思路和具体措施,对油气田安全高效开发具有重要的意义,同时也可作为高压环空带压隐患井治理的参考准则。

The unusual sustained casing pressure(SCP) can directly affect the safety of gas well and field operating persons during high pressure & high temperature(HPHT) oil/gas well producing, and the type of oil tubing- first casing cross flow is most dangerous among them. Based on the production status of 12 oil tubing- first casing cross flow HPHT gas wells, the safety production problems caused by oil tubing-first casing cross flow has been analyzed. Combining with the unusual SCP in oil tubing-first casing cross flow gas well, according to its output, the connectivity between oil tubing and first casing, and the relationship of well head pressure and the annulus maximum permissible working pressure under closing well, the classified management has been conducted, the ideas and concrete measures of the safety production have been presented. It is of great significance to safety and high-efficient developing of oil/gas field. It can also be used as reference to control the risk of HPHT SCP gas well.