基于弹性网眼体的油基钻井液堵漏体系研究与应用

Research and Application of Oil-based Drilling Fluid Plugging System Based on Elastic Mesh Body

侯华丹 于雷

HOU Huadan YU Lei

中石化海洋石油工程有限公司，上海　200137 中石化胜利石油工程有限公司钻井液技术服务中心，山东东营　257017

SINOPEC Offshore Oil Engineering Co. Ltd., Shanghai 200120, China Drilling Fluid Technical Service Center of SINOPEC Shengli Petroleum Engineering Co. Ltd., Dongying, Shandong 257017, China

针对常规堵漏材料与裂缝适应性差的难题，优选压缩变形性好的弹性网眼体作为架桥材料，对其表面改性制备了耐温耐油弹性孔网材料，通过研选刚性颗粒、弹性颗粒、纤维材料，构建了基于弹性孔网的油基钻井液堵漏体系。室内利用2 mm×1 mm楔形长裂缝封堵模拟评价实验装置对堵漏体系封堵性能进行了评价。实验结果表明，形成的堵漏体系裂缝封堵区域位置适中，封堵区域厚度增加，漏失量小，承压能力高。基于弹性孔网的油基钻井液堵漏体系在现场进行了多口井的应用，一次堵漏成功率达84.6%。该技术成果可为裂缝性地层油基钻井液漏失提供行之有效的技术思路。

In order to solve the problem of poor adaptability of conventional plugging materials and cracks, elastic mesh body with good compression and deformation was selected as the bridging material, and temperature-resistant and oil-resistant elastic mesh material was prepared by surface modification. By selecting rigid particles, elastic particles and fiber materials, an oil-based drilling fluid plugging system based on elastic mesh body was constructed. In the laboratory, the plugging performance of the plugging system was evaluated by using a 2 mm×1 mm wedge-shaped long crack plugging simulation on evaluation experimental device. The experimental results show that the fracture sealing area of the formed plugging system is moderate, the thickness of the sealing area increases, the leakage is small, and the pressure bearing capacity is high. The oil-based drilling fluid plugging system based on elastic mesh has been applied in multiple wells on site, and the success rate of one-time plugging has reached 84.6%. The technical results can provide effective technical ideas for oil-based drilling fluid loss in fractured formations.

https://doi.org/10.3969/j.issn.1008-2336.2023.01.055