Method for reducing or completely eliminating water influx in an underground formation, and crosslinkable copolymers for implementing said method

US7150319B2 · kind B2 · utility

Assignee

• Clariant UK Ltd. · GB

Inventors

• Karl Heinz Heier · Frankfurt am Main, DE
• Christoph Kayser · Mainz, DE
• Aranka Tardi · Neuberg, DE
• Michael Schaefer · Heidenau, DE
• Roman Morschhaeuser · Mainz, DE
• James C. Morgan · Yateley, GB
• Alistair Gunn · Reading, GB

Key dates

• Filing date: Sep 24, 2002
• Grant date: Dec 19, 2006
• Expiry date: Dec 10, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/512
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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: R1 is hydrogen or methyl; R2 represents C2–C10 alkylene; and Me+ represents 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: R3 and R4 independently of each other represent hydrogen, methyl or ethyl, or R3 and R4 represent 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.