Hughes Tool Company LLC

Lee F McKenzie

Dyke W Reese

Ray S Pace

Paul M McElfresh

A well bore cementing composition and method are shown in which a hydraulic cement, water and fluid loss additive are combined to form a cementing slurry. The fluid loss additive is a copolymer of a first monomer of dimethyl-diallyl ammonium chloride and a second anionic monomer. The monomer ratio of the non-ionic, water soluble monomer to the anionic monomer is in the range from about 85:15 to 95:5, and the copolymer has a molecular weight in the range from about 200,000 to 400,000.

Non-retarding fluid loss additives for well cementing compositions

A well bore cementing composition and method are shown in which a hydraulic cement, water and a non-retarding fluid loss additive are combined to form a cementing slurry. The non-retarding fluid loss additive is a copolymer of a first non-ionic water soluble monomer which resists hydrolyzing in a cement slurry and a second anionic monomer. The monomer ratio of the non-ionic, water soluble monomer to the anionic monomer is in the range from about 85:15 to 95:5, and the copolymer has a molecular weight in the range from about 200,000 to 400,000.

An aqueous cement composition is shown for cementing the annular space between a pipe and the surrounding bore in a well. The cement composition includes a hydraulic cement, water present in an amount effective to produce a pumpable slurry, a polyamine fluid loss additive, and a sulfonated polymer. By neutralizing the polyamine to a pH of approximately 7, improved free water and fluid loss properties are imparted to the system.

Polyamine fluid loss additive for oil well cements

A fluid loss additive and method are shown for use in cementing oil and gas well bores which comprises the reaction product of a polyamine compound and a high molecular weight sulfonated polymer. The polyamine and high molecular weight sulfonated polymer are prereacted in solution and dried to form a dry product which can be added to the dry cement blend on the shelf or added to the mixing water during the formation of the cement slurry at the well site. The prereacted additive is effective to control fluid loss in cement slurries at 350.degree. F. and higher.

Growing community of inventors

Arlington, TX, United States of America

Lee F McKenzie