Halliburton Company

Dwyann Dalrymple

Edward F Vinson

Kenneth W McKown

Frank A Wood

A method of controlling the permeability of underground well formations by the placement of a chemical barrier is provided. A first fluid and a second fluid are substantially simultaneously injected into the formation via a well bore wherein the first fluid generally contains either a viscosifying agent or a permeability reducing agent and the second fluid contains a sealant. As the two fluids extend radially from the well bore, the injection pressures of the first and second fluids are substantially balanced such that migration of the second fluid into portion of the formation occupied by the first fluid is inhibited.

Placement aid for dual injection placement techniques

A method of reducing the permeability to water of a subterranean geological formation containing sandstone. The method is carried out by contacting the formation with an aqueous mixture comprising a water-soluble anionic polymer having a molecular weight greater than 100,000 and subsequently contacting the anionic polymer with a polymer stabilizing fluid comprising a water-soluble cationic polymer having a molecular weight greater than 1,000.

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Duncan, OK, United States of America

Dwyann Dalrymple