张店叠瓦状油藏注水见效特征研究及对策

Response characteristics of water injection in the imbricated reservoirs of Zhangdian oilfield and corresponding measures

张店油田属于复杂断块油田,其油藏类型主要为断鼻、断层-岩性油藏,油气分布规律为“叠瓦状”。采用大斜度定向井采油,直井注水,在注水过程中油井呈现出常规型、突变型和波动型三种见效特征。结合张店油田储层低渗透、裂缝存在状况、强水敏、油层叠瓦状分布且面积小等实际状况,研究了产生三种见效特征的相应原因,对不同井组、不同的受效类型提出了相应的对策。

Reservoirs in Zhangdian oilfield, a complicated fault block oilfield, are mainly of fault nose and fault-litholog-ic types, and show 'imbricated' distribution. Three types of response features occur during waterflooding, with highly deviated directional wells as production wells and vertical wells as injectors. In combination with the characteristics of Zhangidan oilfield, such as low permeability, existence of fractures, strong water sensitivity and imbricated oil layers with small areas, the causes of these three response features are studied and corresponding measures are presented according to different well groups and different response types.