The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 2021
Filed:
Jan. 18, 2019
Petrochina Company Limited, Beijing, CN;
Tianjiang Wu, Beijing, CN;
Mingke Zheng, Beijing, CN;
Xianwen Li, Beijing, CN;
Haien Yang, Beijing, CN;
Xiaorong Li, Beijing, CN;
Fan Tang, Beijing, CN;
Fangfang Xue, Beijing, CN;
Ronghuan Chen, Beijing, CN;
Rong Zhang, Beijing, CN;
Lijun Zheng, Beijing, CN;
Chunmei Xu, Beijing, CN;
Baoche Liu, Beijing, CN;
Ping Yi, Beijing, CN;
Jiajie Zhu, Beijing, CN;
Weiyu Bi, Beijing, CN;
PETROCHINA COMPANY LIMITED, Beijing, CN;
Abstract
The present invention provides a method for in-depth profile control and displacement of low-permeability oil reservoirs, comprising: sequentially injecting a flexible and elastic particle-containing pre-slug, a polymer microsphere-containing main slug and a flexible and elastic particle-containing protective slug into an oil layer, and the three slugs have a volume ratio of total injection amount of 1-2:6-8:1-2. The invention provides a method for in-depth profile control and displacement by using styrene-based flexible and elastic particles in combination with the polyacrylamide polymer microsphere, wherein the flexible elastic particles can block cracks and large pore channels of the oil layer, and the polymer microsphere can displace the remaining oil in the oil layer. In the present invention, different slugs of profile control and displacement system are combined to achieve the objective of blocking cracks and large pore channels, displacing crude oil, and improving oil well recovery.