塔河油田盐上裸眼承压堵漏技术

Pressure sealing technology of open holes in suprasalt structures of Tahe Oilfield

孙明光

SUN Ming-guang

胜利石油管理局钻井工艺研究院, 山东东营 257017

Drilling Technology Research Institute of Shengli Petroleum Administrative Bureau, Dongying 257017, Shandong, China

为开发塔河油田石炭系巴楚组盐膏层以下的油气藏,采用盐上裸眼与盐层同层揭开的方案,由于存在裂缝性地层或渗漏性地层的漏失,同时地层压力复杂,因此承压堵漏技术成为关键技术之一。介绍了塔河油田盐上井段地层岩性特征,分析了漏失类型及区域分布特征,描述了塔河油田盐层井堵漏技术现状,分析了先前堵漏技术的经验教训,提出了针对不同漏失特征地层优选堵漏材料类型、粒径、浓度、配比,并优化出了2种典型的堵漏配方,配合相应的对策和施工作业措施,明显提高了一次堵漏成功率。实践表明,塔河油田盐上井段长裸眼采用承压堵漏技术是可行的,根据具体情况制定的承压堵漏技术,明显缩短了施工时间,满足了盐层钻井施工要求。

The scheme that uncovers the open holes of suprasalt structures and the salt beds in the same formation is adopted in this paper.Because of the leakage of the fractured formation and the absorbent formation and the complex formation pressure,pressure sealing technology becomes one of the key technologies in developing the hydrocarbon reservoir under the salt-gypsum bed of Carboniferous Bachu Formation of Tahe Oilfield.This paper introduces the lithologic features of the formation in suprasalt structures of Tahe Oilfield,analyzing the leakage types and their regional distribution features,describing the plugging technology used in the wells with salt beds of the oilfield,and summarizing the experiences and lessons obtained from applying the former plugging technologies.It is proposed that the types,grain diameters,density,and rates of plugging materials be selected for formations with different leakage features.As a result,two typical plugging formulas are optimized and corresponding measures are adopted,obviously increasing the primary success rate of plugging.Practices show that it is feasible to apply the pressure sealing technology to the long open holes in suprasalt structures of Tahe Oilfield,which shortens the operation time obviously and meets the need of drilling in salt beds.

10.3969/j.issn.1000-7393.2007.02.026