API RP 10B Recommended Practice for Testing Well Cements - Twenty-Second Edition; Addendum 1 October 1999; Addendum 2 November 2000
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American Petroleum Institute
Recommended Practice for Testing Well Cements - Twenty-Second Edition; Addendum 1 October 1999; Addendum 2 November 2000
N RP 10B
Annotation
1 Scope
1.1 Well Cements
Well cement slurries can be based on (but are not limited to) one of the API classes and grades of cement identified in this section and shown in Table 1. API well cements are produced by grinding Portland cement 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.
API cements are graded according to sulfate resistance. Three grades are defined: ordinary (O), moderate sulfate-resistant (MSR), and high sulfate-resistant (HSR).
1.2 API CEMENT CLASSES
The following is a brief discussion of the differences and similarities among API classes of cement.
1.2.1 Class A
This product is intended for use when special properties are not required. It is available only in ordinary (O) grade. Class A cement is similar to ASTM C 150, Type I with regard to both chemistry and fineness. Processing additions may be used in the manufacture of Class A cement provided such materials in the amounts used have been shown to meet the requirements of AST C 465. Specification testing of Class A cement slurries requires 46 percent water (100 parts dry cement by weight to 46 parts mixing water by weight) according to API Specification 10A.
1.2.2 Class B
This product is intended for use when conditions require moderate or high sulfate-resistance. Class B cement is similar to Class A cement except that it is available in both moderate (MSR) and high sulfate-resistant (HSR) grades. The MSR grade is similar to ASTM C 150, Type II with regard to both chemistry and fineness. The HSR grade is similar to ASTM C 150 Type V with regard to both chemistry and fineness. Specification testing of Class B cement slurries requires 46 percent water (100 parts dry cement by weight to 46 parts mixing water by weight) according to API Specification 10A.
