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:
Jan. 30, 1996
Filed:
Sep. 22, 1994
Takamasa Ohno, Musashino, JP;
Keietsu Kato, Chiba, JP;
Yoshiyuki Yamaguchi, Tokyo, JP;
Masami Murakami, Akishima, JP;
Shogo Suzuki, Calgary, CA;
Shoichi Kanda, Yokohama, JP;
Tsuyoshi Nakagawa, Yokohama, JP;
Nitto Chemical Industry Co., Ltd., Tokyo, JP;
Japan Petroleum Exploration Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a composition for recovery of petroleum and gas, which comprises (a) a copolymer having a molecular weight of 100,000 or more, composed of 30-75 mole % of N-vinylpyrrolidone unit, 5-70 mole % of (meth)acrylamide unit and 0-20 mole % of (meth)acrylic acid unit or a salt thereof, (b) a water-soluble aldehyde, (c) a phenol compound, and (d) water. This composition can form a gel in a required gelling time even at high temperatures and even in the presence of bivalent metal ions and accordingly can be used for efficient recovery of petroleum and gas.