大位移延伸井固井技术

CEMENTING TECHNOLOGY OF EXTENDED REACH WELL

以QK17- 2E区块为例 ,介绍了渤海湾 6口大位移延伸钻井 (ExtendedReachDrilling)后固井的成功作业 ,重点说明了大位移延伸段 ( 311.15mm井眼 )固井的关键技术套管漂浮技术 ,即用“盲板浮鞋 +漂浮接箍”实现套管漂浮 ;用双弓扶正器保证套管居中、减少下套管的摩阻 ;用滚轮扶正器降低界面摩擦系数 ;用CemSAIDS固井仿真软件进行摩阻预测。为提高顶替效率 ,保证固井质量 ,采用双速替钻井液技术 ,实现紊塞流上返 ;采用海水顶替液 ,实现套管的浮力漂浮。文中还阐述长裸眼井况下单级多封的固井技术 ,对陆上大位移固井具有一定的现实意义。

The drilling and cementing operations of six extended reach wells in the block QK17-2E of Bohai Bay is described, and the focus is on the casing floating, a key technology for cementing the 311.15mm hole, which is the displacement section of the extended reach wells. Specifically, casing floating is achieved by combining blind baffle float shoe with floating collar, and using dual-bow centralizers to ensure the centralization of casing and less friction, while roller centralizers are used to reduce the fraction index. A friction prediction software CemSAIDS is used to simulate the real downhole conditions. Double speed drilling fluid displacement technology is applied, to improve displacement efficiency and ensure cementing quality, while return of turbulent and plug flow is achieved. Sea water is used as displacement fluid, which can provide the floating force of casing string. Cementing technology of multi-isolation in single stage in the long open hole is also applied, and it is beneficial for improving the cementing quality of extended reach well on land.