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:
Dec. 19, 2006
Filed:
Sep. 24, 2002
Karl Heinz Heier, Frankfurt am Main, DE;
Christoph Kayser, Mainz, DE;
Aranka Tardi, Neuberg, DE;
Michael Schaefer, Gruendau, DE;
Roman Morschhaeuser, Mainz, DE;
James C Morgan, Yateley, GB;
Alistair M. Gunn, Reading, GB;
Karl Heinz Heier, Frankfurt am Main, DE;
Christoph Kayser, Mainz, DE;
Aranka Tardi, Neuberg, DE;
Michael Schaefer, Gruendau, DE;
Roman Morschhaeuser, Mainz, DE;
James C Morgan, Yateley, GB;
Alistair M. Gunn, Reading, GB;
Clariant UK Ltd., West Yorkshire, GB;
Abstract
A method for reducing or completely eliminating water influx in an oil or natural gas borehole includes introducing in the borehole an aqueous solution of a copolymer comprising: A) 40–98 wt. % of structural units of formula (I), wherein: Ris hydrogen or methyl; Rrepresents C–Calkylene; and Merepresents an ammonium metal ion and an alkali metal ion; B) 0.1 to 58 wt. % of structural units of formula (II); C) 0.1 to 10 wt. % of structural units of formula (III), wherein: Rand Rindependently of each other represent hydrogen, methyl or ethyl, or Rand Rrepresent together a propylene group, which, with inclusion of a radical (A), form a pyrrolidon radical or, with inclusion of a pentamethylene group, forms a caprolactam radical; D) 0.10 to 10 wt % of structural units of formula (IV). The method also includes introducing in the ground or deposit, simultaneously with the copolymer or subsequently, an agent for crosslinking the copolymer.