新型裸眼旁通在塔河油田的改进及应用

Improvement and application of new type open hole by-pass valve in the Tahe Oil Field

谢进 刘练 樊凌云 杨坤 周生福

Xie Jin Liu Lian Fan Lingyun Yang Kun Zhou Shengfu

中国石化西北油田分公司完井测试管理中心, 新疆轮台 841600

Completion Test Management Center, SINOPEC Northwest Company, Luntai, Xinjiang 841600, China

塔河油田地层测试主要采用MFE测试工艺,探井地层压力系数和流体性质很难预测,对于高压地层,在关井过程中由于地层压力高,主旁通为单向密封,可能会出现裸眼旁通处内压大于外压的情况,造成裸眼旁通主旁通刺漏;副旁通结构为滑套式,可能会出现流体冲击或射孔等压力激动可能造成测试过程中副旁通意外打开,油套连通,导致测试失败。通过将主旁通改进为双向密封、密封芯轴套长度加长为改进前的两倍及去掉副旁通,解决了裸眼旁通由于主旁通单向密封造成刺漏和副旁通意外打开的问题,实验效果良好,提高了DST作业一次成功率,已在塔河油田推广应用。

The application of MFE technique in formation tests is very common in the Tahe Oil Field; however, it is difficult to predict the formation pressure coefficient and fluid properties of exploratory wells. The chief by-pass valve of open hole is one-way sealed. It is easy to leak during well shutting when internal pressure is greater than external pressure. The assistant valve has a sleeve type structure. It might open accidentally when pressure changes due to fluid impact or perforation. As a result, oil tube and case are connected, and test fails. We replaced the chief by-pass valve by a two-way sealing valve, double the length of sealing core shaft sleeve, and remove the assistant valve. These measurements improve DTS success rate, and have been applied in field works in the Tahe Oil Field.

https://doi.org/10.11781/sysydz2015S1093