A powder consisting of alumina, silica, lime, and other substances that hardens when mixed with water. Cements are used in oil, gas, geothermal, injection, or water wells for protecting and supporting casing, isolating intervals within the wellbore, repairing casing leaks, sealing perforated or open hole intervals, and protecting fresh water aquifers. Well cements are manufactured to meet MI Specification lOA, which includes chemical, physical, and performance requirements for MI Classes A through H.

Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global Standards


Cement (or Portland Cement)

Ground clinker generally consisting of hydraulic calcium silicates and aluminates and usually containing one or more of the forms of calcium sulfate as an interground addition. NOTE 1 Hydraulic calcium silicates and aluminates are those which harden under water. NOTE 2 Interground additions are added before grinding, rather than after grinding.

Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards



“Cement” means a complex, finely-ground kiln-fired calcium silicate which, when mixed with water, forms a slurry which will harden in the borehole to form an effective seal between the well bore and casing or tubing, or to effectively seal formations penetrated by the well bore.

Source: Division of Mineral Resources Management – Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations



Cement—A mixture of materials for bonding or sealing that attains a 7-day maximum permeability of 0.01 millidarcies and a 24-hour compressive strength of at least 500 psi in accordance with applicable standards and specifications.

Source: Oil and Gas Wells, Pennsylvania Code, Title 25, Chapter 78, December 2012. Regulations


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