柔性钻具侧钻短半径双分支水平井成井-压裂关键技术  

Integrated techniques of flexible drilling tools assisted side-tracking short radius dual-branches and fracturing

作　　者：李根生[1] 黄中伟[1] 史怀忠[1] 杨睿月 武晓光[1] 王天宇 谷子昂 LI Gensheng;HUANG Zhongwei;SHI Huaizhong;YANG Ruiyue;WU Xiaoguang;WANG Tianyu;GU Ziang(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249

出　　处：《中国石油大学学报(自然科学版)》2025年第2期16-27,共12页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金重大项目(52192620);国家自然科学基金创新研究群体项目(52421002);国家自然科学基金面上项目(52374016)。

摘　　要：“两深一非一老”是当前油气勘探开发的重点领域,为加快突破油气高效开发关键技术瓶颈,提出“柔性钻具侧钻短半径双分支水平井成井-压裂一体化技术”,即将柔性钻具侧钻短半径水平井钻井技术与水力喷射压裂相结合,创新研发柔性钻具和压裂管柱组合,在2~4 m超短半径内完成造斜,水平钻进50 m以上,分支内完成趾端定点压裂,最终实现“一井多层、一层多支、一支多缝”的多层系-多分支立体缝控增产改造。首先介绍工艺提出的背景需求、柔性钻具侧钻短半径双分支水平井成井和压裂关键技术,然后结合长庆油田首口现场试验井阐明该技术的可行性与适用性,最后展望该技术的应用前景。结果表明:采用自主研发的柔性钻具可实现在直井多层位沿径向钻出双分支井眼(R1和R^(2)),其中R1分支井眼长度为51.00 m、造斜半径为2.80 m,R^(2)分支井眼长度为30.30 m、造斜半径为3.18 m;采用自主研发的柔性压裂管+底部喷砂射孔-压裂组合工具,实现双分支水平井眼趾端定点起裂,累积加砂量9.00 m^(3)、入井净液量198.13 m^(3),按设计加砂完成率100%,压裂一次成功率100%;改造后日产油量由0.84 t提升至2.06 t,提升2.45倍。In this study,a dual-branch horizontal well completion-fracturing integration technique using a flexible drilling tool with side-drill of short radius was proposed,in which short-radius horizontal well drilling is combined with hydraulic jet fracturing with innovatively developed flexible drilling tools and fracturing strings.The new technique includes directional drilling within a 2-4 m ultra-short radius and further horizontally drilling over 50 m,and then toe-point water jet fracturing within the horizontal well branches can be carried out.It can achieve the goals of one well with multi-layers,multi-branches and multi-fractures for enhanced oil recovery.The background for the development of the new technique and its key technical aspects were introduced in this paper.The feasibility and applicability of the technique was verified through the first on-site trial well in Changqing Oilfield.The developed flexible drilling tool was successfully used for dual-branch wellbores(R1 and R^(2))to be drilled radially along the multi-layered vertical well,in which the R1 branch has a length of 51.00 m with a build-up radius of 2.80 m,and the R^(2)branch has a length of 30.30 m with a build-up radius of 3.18 m.Then the flexible fracturing pipe and bottom sand-perforating fracturing tool were used to conduct toe-point fracturing in the dual-branch horizontal wellbores with cumulative sand volume of 9.00 m^(3)and a net liquid entry into the well of 198.13 m^(3).The sand placement success rate is 100%,and the fracturing success rate is also 100%.After the side well drilling and fracturing operations,daily oil production is increased from 0.84 t to 2.06 t,a 2.45 fold of increase.

关 键 词：超短半径多分支井 柔性钻具 水力喷射压裂 立体缝网 

分 类 号：TE21[石油与天然气工程—油气井工程]