Atlantic Richfield Company

J Benjamin Bloys

Robert B Carpenter

William N Wilson

Roger D Bradshaw

Bonsall S Wilton

David L Johnson

Kenneth R Riggs

A cement slurry composition suitable for well bore cementation is provided containing as an essential component a synthetic hectorite clay in amount sufficient to reduce free water formation and solids segregation.

Cement composition

Gas leakage from oil wells through casing thread connections and other small leakage spaces is reduced or eliminated by injecting into the lift gas flowstream a sealant composition comprising a carrier liquid, such as diesel fuel or water, an ethoxylated phenol surfactant and particulate silica and/or Gilsonite. A liquid sealant composition is injected into oil wells on artificial gas lift comprising arctic diesel fuel, a surfactant and solubilized Gilsonite in a weight ratio of about 10:1 diesel fuel to Gilsonite and diesel fuel to surfactant, respectively. Effective reduction in leakage flow rates is obtained over a relatively short time period (one to ten hours).

Well conduit sealant and placement method

What is disclosed is a method of accelerating the set of a retarded cement. The cement may range from a drilling fluid containing dispersants or retarders that will slow down the set of the drilling fluid when cementitious fluid is added thereto, through overwashing, or treating a retarded primary or remedial cement that may have been injected into fractures or areas within a well to overwashing a plug or any volume of retarded cement that needs to be set in a well. The specific uses are discussed.

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Plano, TX, United States of America

J Benjamin Bloys