风险探井驿探1井钻井技术实践

Well Yitan-1: A drilling technology practice of a risk exploration well

韩成福 张建卿 胡祖彪 王清臣 朱明明 王浩

HAN Chengfu ZHANG Jianqing HU Zubiao WANG Qingchen ZHU Mingming WANG Hao

中国石油集团川庆钻探工程有限公司长庆钻井总公司

Changqing Drilling Company, CNPC Chuanqing Drilling Engineering Co., Ltd., Xi’an 710018, Shaanxi, China

驿探1井位于鄂尔多斯盆地西缘冲断带，由于该区块地层倾角大、刘家沟及石千峰组裂缝发育、地质构造复杂，因此防斜打直、防漏堵漏和井壁失稳是该井钻探施工过程中的主要技术难点。针对驿探1井上部地层狗腿度超标、断层地应力异常、井壁稳定性差、地层承压能力弱等问题，通过优化钻具组合,采用套管防磨工艺、高性能钻井液、韧性水泥护壁等技术措施，解决了钻井过程中存在的卡钻、频繁断钻具、井壁失稳等技术难题，保证了该井的安全顺利完钻，有力地促进了复杂地质构造条件下风险探井安全高效钻进技术的提高。

Well Yitan-1 is placed in the western margin thrust belt of the Ordos Basin. Due to the high dip angle of strata, well-developed fractures of the Liujiagou and Shiqianfeng Formations and complex geologic structure, the well inclination prevention, leakoff prevention and plugging, and wellbore instability are the main technical challenges of the well construction operation. Given the excessive dogleg severity of the upper strata, fault-related in-situ stress anomaly, inferior wellbore stability, and low pressure-bearing capacity of strata in Well Yitan-1, the BHA optimization was performed, and the casing anti-abrasion technology, high-performance drilling fluid, and flexible cement borehole wall protection were applied. These implemented measures solved the technical difficulties during drilling, such as bit sticking, frequent tool breaking, and wellbore instability and ensured the safety and operation smoothness of drilling. The drilling practice and obtained understanding effectively promote the advancement of safe high-efficiency drilling of risk exploration wells in complex geological structures.

10.13639/j.odpt.2022.06.003