测试作业之井筒完整性标准

Well integrity criteria for testing operations

本文旨在介绍与井筒完整性有关的预探井及评价井井筒测试作业要求和标准。该测试作业始于钻完设计井深和电测录完裸眼井段,终于井筒压井结束和测试管柱起出。介绍了在过平衡、平衡、欠平衡3种压力条件时的测试作业以及建立不间断压力系统的工作,给出了4个典型图例以说明海洋井测试作业所用井筒屏障的功能、结构组件及其验收标准,并在附录中给出了就地地层、测试管柱作为井筒屏障及其验收要求。明确了测试作业时的井控程序及在井控条件下的钻井作业。在井筒完整性标准基础上,对测试作业的测试压力、测试载荷进行了设计,对测试作业的准备工作和风险防范工作进行了标准化。

The requirements and standards related to well integrity during well testing of exploration wells and appraisal wells were illustrated. Testing operation begins when the well is drilled to the designed depth and the electric logging in the open hole is finished, and ends when the well is killed and the testing string is tripped out. Firstly, the testing operation in three pressure conditions （overbalance-balance-underbalance） and the operation to establish a continuous pressure system were illustrated. Secondly, 4 typical diagrams were provided to describe the function, structural component and acceptance standard of well barrier in testing operation. It was pointed out in the appendix that in-situ formation and testing string are taken as the well barrier and its acceptance requirements were also listed. Thirdly, the well control procedure in the process of testing operation and the drilling activities under the condition of well control were described. Fourthly, the design basis, testing load and design assumption of testing operation were illustrated. And finally, the way to prevent the formation of hydrate in the process of testing operation was introduced briefly.