涪陵页岩气田防漏堵漏技术应用研究

涪陵页岩气田开发过程中最大的问题就是井漏,据统计,有67.2%的井在钻井过程中都发生了不同程度的漏失,影响了钻井工程质量、进度及效益,特别是三开长水平段漏失油基钻井液,造成了严重的经济损失。为了降低钻井工程风险、提高钻井速度、降低钻井成本,从现场实际情况出发,对钻井漏失情况进行了统计分析,认为中浅层漏失以溶洞型漏失、缝洞型漏失为主,龙马溪、五峰组漏失以裂缝型漏失为主。重点介绍了针对涪陵页岩气田各开次特点采取的防漏堵漏技术及现场应用情况。同时随着开发区域扩大,地质情况有所改变,井漏问题更加复杂,提出了下一步防漏堵漏技术发展方向及建议。

Application Research on Lost Circulation Prevention and Plugging in Fuling Shale Gas Field

Lost circulation control is the biggest problem in the development process of Fuling shale gas field. According to statistics, different degrees of lost circulation occurred in 67.2% wells during drilling, which has bad affect on the engineering quality, the construction progress and the economic benefit; especially the lost circulation of oil-based drilling fluid in the three opening and long horizontal section, which caused serious economic losses. In order to reduce the risk of drilling engineering, improve drilling efficiency and reduce drilling cost, starting from the actual situation on site, the statistical analysis was made on drilling leakage, it was thought that in middle-shallow layer were mainly karst cave leakage and fracture-cavity type leakage; in Longmaxi formation and Wufeng formation was mainly fracture type leakage. The paper introduces the lost circulation prevention and plugging technologies adopted in Fuling shale gas field according to the characteristics of each opening and the field application. Along with the development region extension, the geological conditions become changing and the leakage is more complicated, the next development direction of lost circulation prevention and plugging technologies are put forward with some suggestions.