- 责任者：Wang Jianyan (Research Institute of Drilling Engineering Technology ; Daqing Drilling and Exploration Engineering Corporation ; Daqing 163413 ; China) ; Li Ruiying
- 刊名：Exploration Engineering
- 出版年：2013
- 卷期：40(11)
- 关键词：欠平衡压力钻进 ; under-balance pressure drilling
- 页码：p.32-34
- 图表：1 illus., 3 tables, 5 refs.
- 分类号：2000
- issnNo：ISSN1672-7428
- isbnNo：CN11-5063/TD
Putaohua reservoir is the main target layer for exploration appraisal well in middle-shallow layer of periphery of Daqing oilfield, but it is a ＂three low＂ reservoir, the conventional drilling will cause high cost and low benefit; and by the characteristics of ＂three low＂ reservoir, the filtrate under differential pressure is harmful to reservoir. The formation charac- teristics and overbalance drilling result in low single well production. As a circulating medium of gas drilling in the reser- voir, nitrogen has obvious advantages in the reservoir discovery and protection. The nitrogen drilling practice was made in Putaohua reservoir in middle-shallow layer of periphery of Daqing oilfield in 2011, technological innovation was carried out in the well structure, drilling technology and completion methods, the average penetration rate reached 24.43m/h in the 4 test wells, which was more than 2 times of that of adjacent wells by conventional drilling technology. Oil flow was found at sand draining outlet in the drilling process with good reservoir protection effects.