Ondeo Nalco Energy Services, L.p.

Bp Chemicals Limited

Nalco Company

T R Oil Services Limited

Clariant UK Ltd.

James Charles Morgan

Kin-Tai Chang

Harry Frampton

Alistair Manson Gunn

Ian Ralph Collins

Roman Morschhaeuser

Christoph Kayser

Karl Heinz Heier

Nevin John Stewart

Aranka Tardi

Stephen Paul Goodwin

Michael Schaefer

A composition comprising expandable cross linked polymeric microparticles having an unexpanded volume average particle size diameter of from about 0.05 to about 10 microns and a cross linking agent content of about 6,000 to less than about 9,000 ppm of labile cross linkers and from 0 to about 300 ppm of non-labile cross linkers, useful for modifying the permeability of subterranean formations and increasing the mobilization and/or recovery rate of hydrocarbon fluids present in the formations.

Composition for recovering hydrocarbon fluids from a subterranean reservoir

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&#x2013;98 wt. % of structural units of formula (I), wherein: Ris hydrogen or methyl; Rrepresents C&#x2013;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.

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

A process for treating a hydrocarbon-bearing formation having at least one hydrocarbon bearing zone and at least one water bearing zone wherein the ratio of the permeability of the hydrocarbon bearing zone(s) to the permeability of the water bearing zone(s) is in the range of from 1:20 to 3:1 comprising: a) sequentially injecting into the formation: (i) an aqueous polymer solution comprising 0.01 to 0.5 weight percent of a water-soluble polymer having from 0.01 to 7.5 mole % of crosslinkable carboxylate and/or phosphonate groups and a molecular weight in the range of 250,000 to 12,000,000; and (ii) an aqueous solution of a crosslinking agent; and b) back-producing the aqueous polymer solution over the crosslinking agent so that the polymer crosslinks within the formation to form a gel which is collapsible to allow hydrocarbon flow.

Process for altering the relative permeability if a hydrocarbon-bearing formation

A composition comprising expandable cross linked polymeric microparticles having an unexpanded volume average particle size diameter of from about 0.05 to about 10 microns and a cross linking agent content of from about 9,000 to about 200,000 ppm of labile cross linkers and from 0 to about 300 ppm of non-labile cross linkers. The composition is used for modifying the permeability of subterranean formations and increasing the mobilization and/or recovery rate of hydrocarbon fluids present in the formations.

Composition and method for recovering hydrocarbon fluids from a subterranean reservoir

This invention is directed to a composition comprising expandable cross linked polymeric microparticles having an unexpanded volume average particle size diameter of from about 0.05 to about 10 microns and a cross linking agent content of about 1,000 to less than about 9,000 ppm of labile cross linkers and from 0 to about 300 ppm of non-labile cross linkers and to the use of the composition for modifying the permeability of subterranean formations and increasing the mobilization and/or recovery rate of hydrocarbon fluids present in the formations.

Method of recovering hydrocarbon fluids from a subterranean reservoir

This invention is directed to a composition comprising expandable cross linked polymeric microparticles having an unexpanded volume average particle size diameter of from about 0.05 to about 10 microns and a cross linking agent content of from about 9,000 to about 200,000 ppm of labile cross linkers and from 0 to about 300 ppm of non-labile cross linkers and to the use of the composition for modifying the permeability of subterranean formations and increasing the mobilization and/or recovery rate of hydrocarbon fluids present in the formations.

A method of recovering or increasing the recovery of oil and/or gas from an underground formation involving injecting into the formation, preferably in the form of an aqueous solution, at least one mono alkyl ether of polyethylene glycol in which the alkyl group has 3-5 carbons and the polyethylene glycol contains 3-6 ethylene oxy units e.g. butyl ether of triethylene glycol. Especially preferred are mixtures comprising that and at least one mono alkyl ether of mono or di ethylene glycol e.g. a mixture of butyl triglycol ether, butyl tetraglycol ether, butyl pentaglycol ether and butyl diglycol ether. The method of the invention may be applied to well stimulation treatments such as water blocking, sand consolidation, sandstone acidizing and methods of increasing the recovery of oil such as tertiary oil recovery.

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Yateley, United Kingdom

James Charles Morgan