Method of raising oil deposil erude petroleum recovery ratio
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 中国石化胜利油田有限公司地质科学研究院
- Publication Date
- 2005-08-10
- Estimated Expiration
- Not applicable · inactive patent
Abstract
Description
Technical field:
[0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a method for increasing the recovery rate of crude oil in underground oil reservoirs in the late stage of oil field development. Background technique:
[0002] When oilfield production is in the later stage of development, that is, it enters the stage of high water cut and ultra-high water cut. For many years, many experts in oil exploration technology have been working hard to discuss how to improve the development effect of old oilfields and increase recoverable reserves. At present, oilfields usually use water injection wells to flood oil, and the recovery rate of water flooding is about 30%, and there is still a large amount of crude oil remaining underground that cannot be recovered, resulting in a huge waste of oil resources that are already very tight. Polymer flooding is currently a relatively advanced tertiary recovery technology, which can increase t...