?193.7mm套管开窗侧钻分支井钻完井技术

Drilling and completion technique for multilateral well sidetracked through ?193.7 mm casing hole

曙125-H3井位于辽河坳陷西部凹陷曙光低潜山曙125区块,是一口利用复杂结构分支井技术提高单井控制储量的特殊工艺井。该井是国内首口?193.7 mm套管开窗侧钻的分支井,存在井身结构复杂、井场位置受限、井深、水平段长、轨迹上翘等实施难点。通过井身结构优化、开窗位置优选、井眼轨迹优化实现了井身结构瘦身,节约了钻井投资,通过高压造斜器底座的研制与应用、钻具优选、钻进方式优化、紧后扩眼、强刚性钻具通井、弯管-导管重入等技术解决了现场实施中的技术难点。该井的成功实施提供了一种新的分支井井身结构,可以有效降低钻井投资,提高单井井眼波及范围。

Well Shu 125-H3, deployed in the Shu 125 Block in the Shuguang low buried hill, western Liaohe depression, is a techni-cally special well to control more reserves by using complicated multilateral well technique. It is the frst multilateral well sidetracked through Ф193.7 mm casing hole. Operations of Well Shu 125-H3 were challenged by complicated well structure, restricted well site, large well depth, long horizontal section and upwarding trajectory. Through optimizations of casing program, casing hole position and hole trajectory, the well structure was optimized effectively and the drilling investment was reduced. Technical diffculties in feld op-erations were addressed by virtue of high-pressure whipstock seat, optimal drilling tools, optimized drilling mode, immediate reaming, drifting with highly-stiff tools, and bend-conductor re-entry. The successful drilling and completion of Well Shu 125-H3 recommends a new casing program of multilateral well to reduce drilling cost effectively and increase single-well sweeping coverage.