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

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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 (2)
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 →
CONVERSION Recorded Jan 30, 2017
From: ISP INVESTMENTS INC.
To: ISP INVESTMENTS LLC
Reel/Frame 041556/0499 →