IP Library › Granted Patent US 7,605,112
Granted Patent B2
US 7,605,112 · App. 11/266,787 · Granted Oct 20, 2009

Shale inhibition

Assignee: ISP Investments Inc.
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Quick Facts
Patent No.
US 7,605,112
App. No.
11/266,787
Granted
Oct 20, 2009
Kind
B2
Abstract

A method of shale inhibition comprises adding a two-phase polymer system of a water soluble copolymer of vinyl pyrrolidone and dimethylaminopropyl methacrylamide and in-situ formed water-insoluble particles of said copolymer, or, alternatively, a water-soluble copolymer of methylvinyl ether and maleic anhydride, into a drilling well fluid under aqueous, high temperature, high salinity conditions.

Claims (2)

1. A method of shale inhibition comprising adding a composition comprising a two-phase polymer system of a water-soluble copolymer of vinyl pyrrolidone and dimethylamino propyl methacrylamide and in-situ formed water-insoluble particles of said copolymer, into a drilling well fluid under aqueous, saline conditions.

2. A method according to claim 1 wherein said composition provides a percentage recovery of >90% when tested in accordance with American Petroleum Institute's Recommended Practice 131/ISO 14016:2002.

Assignments (7)
RELEASE OF SECURITY INTEREST Recorded Jan 10, 2020
From: THE BANK OF NOVA SCOTIA
To: AVOCA LLC; HERCULES LLC; ISP INVESTMENTS LLC; PHARMACHEM LABORATORIES LLC
Reel/Frame 051557/0504 →
SECURITY AGREEMENT Recorded Jul 3, 2017
From: AVOCA, INC.; HERCULES LLC; ISP INVESTMENTS LLC; PHARMACHEM LABORATORIES, INC.
To: THE BANK OF NOVA SCOTIA, AS ADMINISTRATIVE AGENT
Reel/Frame 043084/0753 →
CONVERSION Recorded Jan 30, 2017
From: ISP INVESTMENTS INC.
To: ISP INVESTMENTS LLC
Reel/Frame 041556/0499 →
RELEASE OF PATENT SECURITY AGREEMENT Recorded Mar 18, 2013
From: THE BANK OF NOVA SCOTIA
To: ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC; AQUALON COMPANY; ISP INVESTMENTS INC.; HERCULES INCORPORATED
Reel/Frame 030025/0320 →
PATENT RELEASE Recorded Sep 19, 2011
From: JPMORGAN CHASE BANK, N.A. (F/K/A THE CHASE MANHATTAN BANK)
To: ISP CAPITAL, INC.; ISP CHEMICAL PRODUCTS, INC.; VERONA, INC.
Reel/Frame 026930/0774 →
SECURITY AGREEMENT Recorded Sep 16, 2011
From: ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC; HERCULES INCORPORATED; AQUALON COMPANY; ISP INVESTMENT INC.
To: THE BANK OF NOVA SCOTIA, AS ADMINISTRATIVE AGENT
Reel/Frame 026918/0052 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 4, 2005
From: ORTON, SARAH; MINT, ANDREW; GIBBISON, ROBERT
To: ISP INVESTMENTS, INC.
Reel/Frame 017189/0696 →
Continuity (1)
Related Publication 20070105723A1 · May 10, 2007