Baker Hughes Corporation

Patricia A Potts

Michael A Jarrett

Tao Xiang

Frank E Evans

James E Norfleet

Allen Dale Gabrysch

John C Welch

Harold R Krause

A drilling system fluid and method of using same. The drilling system fluid comprises water as a continuous phase, an amount of a multivalent metal, and a quantity of a water soluble polyacrylamide copolymer having a charge density of at least about 1%. In a preferred embodiment, the fluid also comprises a second amount of a monovalent salt effective to increase gas hydrate suppression and decrease density when compared to a fluid consisting essentially of only a divalent salt in the absence of the monovalent salt.

Water based fluids comprising multivalent salts and low molecular weight, low charge cationic polyacrylamide copolymers

A drilling fluid and method of using same. The drilling fluid comprises water as a continuous phase, an amount of calcium chloride, and a quantity of a polyacrylamide copolymer. The amount of calcium chloride and the quantity of polyacrylamide copolymer in the drilling fluid are sufficient to produce a rate of penetration approaching that achieved using a synthetic oil-based drilling fluid while preventing substantial screen blinding. In a preferred embodiment, the continuous phase also comprises a second amount of a monovalent salt effective to increase gas hydrate suppression and decrease density when compared to a fluid consisting essentially of only a divalent salt in the absence of the monovalent salt.

Shale stabilizing drilling fluids comprising calcium chloride and low molecular weight low charge cationicpolyacrylamide copolymers

A drilling fluid having a brine base fluid, aluminum chlorohydrate as a viscosifying agent, an alkoxylated surfactant, and an amphoteric polymer encapsulant has been found to have excellent viscoelasticity and suspension characteristics. Surprisingly, it has been discovered that a synergistic effect is present between the aluminum chlorohydrate and the surfactant such that less of each component is required when both are used together to suspend the same amount of solids, than if one or the other is used separately.

Use of alkoxylated surfactants and aluminum chlorohydrate to improve brine-based drilling fluids

Growing community of inventors

Houston, TX, United States of America

Patricia A Potts