反循环钻井技术返砂导流线设计及适应性分析  

Structure Design and Adaptability Analysis of Sand Return Diversion Pipeline for Reverse Circulation Drilling

作　　者：康波 樊洪海[1] 邓嵩 朱硕 邵帅 倪兴亚 刘雅莉 Kang Bo;Fan Honghai;Deng Song;Zhu Shuo;Shao Shuai;Ni Xingya;Liu Yali(China University of Petroleum(Beijing);Research Institute of Drilling Technology,Sinopec Shengli Petroleum Engineering Company;School of Petroleum Engineering,Changzhou University)

机构地区：[1]中国石油大学(北京) [2]中石化胜利石油工程公司钻井工艺研究院 [3]常州大学石油工程学院

出　　处：《石油机械》2020年第3期37-43,共7页China Petroleum Machinery

基　　金：国家自然科学基金项目“深水钻井隔水管-导(套)管力学特性研究与水下井口稳定性分析”(51574261);江苏省研究生科研与实践创新计划项目“基于卷积-循环神经网络有杆抽油系统工况诊断预警方法”(SJCX19_0670)。

摘　　要：针对常规返砂管道无法满足反循环钻井技术返砂要求的问题,采用耐冲软管与排砂硬管相结合的方式,提出了两种新型返砂导流管道方案--U形线方案和悬链线方案。建立了悬链线及U形线的返砂导流管道数学模型,采用Fluent软件对管道整体特别是T形接头处进行流动及冲刷腐蚀模拟。根据模拟结果优选出悬链线方案,并且研究了相关配套设备,给出完整的返砂系统优化设计。在乐安油田选取一口试验井进行了5 d的反循环钻井试验,试验中,返砂效率接近92. 53%,起钻后井底基本无沉砂。研究结果可为双壁钻杆反循环钻井技术的应用提供理论指导。To address the problem that conventional sand return pipeline cannot meet the sand return requirements of reverse circulation drilling technology,two new sand return pipeline schemes-U-shaped pipeline and catenary pipeline are proposed based on the combination of impact resistant hose and hard sand discharge pipe. Mathematical models of catenary and U-shaped sand return diversion pipelines are established. Fluent software is used to simulate the flow and erosion corrosion of the entire pipeline,especially the T-joint. According to the simulation results,the catenary scheme is selected,and related supporting equipment is studied to provide the design of the complete sand return system. A test well was selected in Lean Oilfield for a 5-day reverse circulation drilling test.The sand return efficiency was close to 92. 53%,and there was almost no sand at the bottom of the well after drilling. The study results can provide theoretical guidance for the application of double-wall drill pipe reverse circulation drilling technology.

关 键 词：双壁钻杆 反循环钻井 悬链线 返砂导流管 FLUENT 数值模拟 

分 类 号：TE921[石油与天然气工程—石油机械设备]