Bj-Hughes Inc.

Hughes Tool Company LLC

Richard G Gandy

Virgilio G Boncan

Garry L Briggs

Rudolf J Novotny

Vincent Cohee White

Benton L Dibrell

An additive blend for a well cementing composition is shown which comprises a copolymer of acrylamide and 2-acrylamido-2-methylpropane sulfonate, the sodium salt of naphthalene formaldehyde sulfonate, and polyvinylpyrrolidone polymer. The fluid loss additive is mixed together with a hydraulic cement and water in an amount to produce a pumpable slurry. The cement slurry is pumped to the desired location in the wellbore and allowed to harden to a solid mass.

Well cementing method using an AM/AMPS fluid loss additive blend

A cement composition is shown for use in preparing a pumpable slurry capable of setting and developing compressive strength at low temperatures. The cement composition includes a hydraulic cement, gypsum, calcium chloride and a setting time retarding agent. The cement composition also includes an additive blend comprising sodium metasilicate, lime and hydroxyethyl cellulose. The cement slurries of the invention are prepared by adding mixing water to the dry cement composition in an amount ranging from about 8 to about 13 gallons of water per 89 pounds of dry cement composition.

Cold set cement composition and method

A well cementing composition and method of cementing well bores are disclosed in which a slurry is first prepared utilizing cement, mixing water, and aluminum hydroxychloride in the range of 0.1 to 4.5 weight percent based on the dry weight of cement. The slurry thus prepared when pumped into place in the well bore has zero free water content thereby reducing the bridging or channeling in the cement column which is associated with free water formation.

Zero free water cement composition and method

An expansive admixture is shown of the type used in cementing oil and gas well bores. Aluminum particles are coated with a gasoline and water insoluble wood resin. The resin coated aluminum particles in combination with activated charcoal and a fluid loss additive provide controlled expansion of the slurry over an extended period of time without detracting from other desirable properties of the slurry.

Expansive admixture

A method of making lightweight cement slurry which involves dissolving sodium metasilicate and an activator in mix water, and thereafter mixing Portland cement therewith. The activator may be calcium chloride, calcium formate, calcium oxide, a water soluble calcium compound or a mixture thereof. The lightweight cement slurry so formed may be used for cementing well pipe in wells or for casting lightweight structural members, such as board, columns, and the like.

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Grand Prairie, TX, United States of America

Richard G Gandy