希望油田钻井技术研究及应用

Study and application of drilling techniques in Xiwang Oilfield

吴志均 唐红君 陈刚 李俊波

WU Zhijun TANG Hongjun CHEN Gang LI Junbo

西南石油大学，四川成都　610500 中国石油勘探开发研究院廊坊分院，河北廊坊　065007 恒泰艾普石油天然气技术有限公司，北京　100084

Southwest Petroleum University, Chengdu 610500, China PetroChina Research Institute of Petroleum Exploration and Development-Langfang, Langfang 065007, China LandOcean Energy Services Co. Ltd, Beijing 100084, China

希望油田要钻遇泥岩、盐岩和膏岩等复杂层段，探井采用3层套管的井身结构，钻井成本较高，钻井周期较长。为降低钻井成本和加快产能建设速度，决定利用开发井的钻井技术来进行开发。该油田具有正常地层压力系统，破裂压力梯度高，但是存在泥岩、盐岩和膏岩层段的井壁稳定和保护油层2个技术难题。选用两性离子聚合物钻井液，并保持钻井液中大分子含量达到合理值等技术措施，保证井壁的稳定；采用屏蔽暂堵技术保护油层。将井身结构优化技术和钻井液技术结合起来形成开发井的钻井技术，将井身结构由3层套管优化为2层。现场应用结果表明：钻井施工顺利，钻井周期缩短，钻井成本降低，油井产量高，经济和社会效益明显。

Because the complicated formations（such as mudstone, salt bed and gypsolyte）are drilled in Xiwang Oilfield, three-section casing is usually taken as the well structure of exploration wells, but the drilling cost is high, and the drilling period is long. The drilling technique of development wells is determined to be used to decrease drilling cost and to speed up the pace of productivity construction. The advantages of the well are normal formation pressure and high formation fracture pressure gradient, but two problems must been resolved which are wall stabilization of mudstone, salt bed and gypsolyte and formation damage control. To ensure wall stabilization, zwitterionic polymer drilling fluid is selected and macromolecule polymer must been maintained at reasonable value. the technique of temporary shielded plugging is applied to protect the two formations. Therefore, the drilling technique of development wells is formed by combining the optimization technique of well structure with drilling fluid technique, and well structure may be optimized from three-section casing to two-section casing. The results of the field application of the technique show that the drilling operation is smooth, the drilling period is shortened, the drilling cost is reduced, the productivity is high, and the economical and social benefit are apparent.