江沙33-6HF井尾管固井短路复杂情况分析

Short Circulation Happened in Liner Cementing of Jiangsha 33-6HF Well

江沙33-6HF井是四川盆地川西坳陷中江—回龙鼻状构造一口二开制开发水平井,以下沙溪庙组JS33-2砂组为主要目的层,设计井深3 784 m,水平段长904.5 m。在尾管固井过程中,发生短路循环,经过找漏、磨铣、试压等处理,顺利完成油气测试,满足后期生产要求。固井时发生短路循环的情况十分少见,没有类似的成功处理经验。对短路循环情况、处理情况和原因进行了分析,提出了环空试压、测循环迟到时间等预防措施。

Jiangsha 33- 6HF well, which is located at the Zhongjiang- Huilong nosed structure, western Sichuan depression,is a horizontal well with a system of two opening. During its drilling,the JS3-23 sandstone layer was taken as the main target zone, and the design depth and length of horizontal interval were 3 784 m and904.5 m, respectively. However, a situation of short circulation happened during its liner cementing. So, some measures against this situation, including finding out failures, milling, and pressure testing, were used to finish an oil test which might meet the requirement of a later production. Even though the short circulation happened during a cementing very rarely, some aspects of short circulation are presented in this paper, such as its processing and cause.In addition, many protective measures to carry on an annulus pres-sure test and to test a lag time of short circulation are made.