东海油基钻井液井漏治理堵漏方法与作业实践
Plugging methods and field practices for well leakage control on oil-based drilling fluids in the East China Sea
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- 引用格式:
-
张海山.东海油基钻井液井漏治理堵漏方法与作业实践[J].天然气与石油,2025,43(6):70-76.doi:10.3969/j.issn.1006-5539.2025.06.010
ZHANG Haishan.Plugging methods and field practices for well leakage control on oil-based drilling fluids in the East China Sea[J].Natural Gas and Oil,2025,43(6):70-76.doi:10.3969/j.issn.1006-5539.2025.06.010
- DOI:
- 10.3969/j.issn.1006-5539.2025.06.010
- 作者:
- 张海山
ZHANG Haishan
- 作者单位:
- 中海石油(中国)有限公司上海分公司, 上海 200335
CNOOC China Ltd., Shanghai Branch, Shanghai, 200335, China
- 关键词:
- 油基钻井液;井漏治理;防漏堵漏;堵漏工艺;堵漏材料;随钻堵漏;段塞堵漏
Oil-based drilling fluids; Leakage control; Prevention and plugging of leakage; Leakage plugging process; Plugging material; Drill-with-plugging; Segmental plugging
- 摘要:
油基钻井液在东海油气勘探开发中应用广泛,但油基钻井液易漏失,堵漏难度大,亟需研发治理油基钻井液井漏的技术方法。分析东海地层特性,梳理钻井液堵漏治理挑战。系统地集成东海堵漏工作法,创新利用电成像测井资料获取漏失层裂缝宽度,综合地层漏失裂缝宽度增量和挤注裂缝宽度增量,估算堵漏材料架桥粒子大小;创新优选适用于油基钻井液的强承压堵漏剂PF-LCLOCK和片状树脂材料PF-BLN等堵漏材料,科学配制颗粒多级配承压堵漏浆;按照不同井漏情况,实施随钻堵漏、段塞堵漏、专项堵漏等工艺技术。作业实践应用6井次,成功率100%,封堵井筒漏失地层,大幅提高了地层承压能力,支撑裸眼井眼稳定和延伸,顺利完成后续作业,节约工期超25 d。东海油基钻井液井漏治理堵漏方法有效解决了油基钻井液井漏治理难题,拓展了油基钻井液在易漏层的应用,对其他区域的井漏治理有指导意义。
Oil-based drilling fluids(OBDFs) are widely used in exploration and development in the East China Sea. However, OBDFs are prone to leakage and difficult to seal, creating an urgent need for technical methods to control OBDF well leakage. The geological characteristics of the East China Sea and the difficulties in controlling well leakage are analyzed. The East China Sea leakage-control workflow is integrated systematically. Using electrical-imaging logging data to obtain the width of fractures in the loss zone, and by considering the increment of loss-zone fracture width and squeeze-fracture width, the bridging particle size of the plugging material is estimated. Innovatively selected high-pressure-resistant plugging materials suitable for OBDFs, such as PF-LCLOCK and sheet-like resin PF-BLN, and scientifically prepared a multi-stage graded bridging slurry for pressure plugging. Depending on different well leakage situations, operations such as drilling-with-plugging, segmental plugging, and specialized plugging are implemented. Field practice was conducted on 6 wells with a success rate of 100%. The leakage in the loss zones within the wellbore was sealed, significantly improving the formation's pressure-bearing capacity and supporting the stability and extension of the open-hole interval, enabling subsequent operations and saving more than 25 days of construction duration. The OBDF leakage-control method effectively solves the issue of OBDF leakage, expands OBDF application to leaky formations, and provide guidance for leakage control in other areas.
