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:
Aug. 02, 2022
Filed:
Sep. 03, 2020
Tsinghua University, Beijing, CN;
Shanxi Research Institute for Clean Energy, Tsinghua University, Shanxi, CN;
TSINGHUA UNIVERSITY, Beijing, CN;
Abstract
The present invention provides an enhanced oil recovery method by nanofluid-assisted COhuff-n-puff. A nanofluid is injected into an injection well in an oil reservoir formation having hydrophilic wetting characteristics, and soaking is performed; in the soaking stage, after the nanofluid tends to replace crude oil to occupy dead-ends of fractures and pores, and liquid COis injected; and in the process of production, COoriginally dissolved in the formation fluid reaches a supersaturated state. As a result, COpreferentially nucleates at the nanofluid side to generate CObubbles, grows and expands with the continuous reduction of formation pressure, and pushes crude oil near the dead-ends of fractures and pores to move outward, thereby improving the recovery efficiency.