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API Spec 10A Specification for Cements and Materials for Well Cementing, Twenty-Fifth Edition, Includes Addendum (2019)
standard by American Petroleum Institute, 03/01/2019
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API SPECIFICATION 10A
TWENTY-FIFTH EDITION, MARCH 2019
API MONOGRAM PROGRAM EFFECTIVE DATE: SEPTEMBER 2019 ADDENDUM 1, NOVEMBER 2019
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the term “shall” denotes a minimum requirement in order to conform to the specification;
the term “should” denotes a recommendation or that which is advised but not required in order to conform to the specification;
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It is necessary that users of this specification be aware that further or differing requirements can be required for individual applications. This specification is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This can be particularly applicable where there is innovative or developing technology. Where an alternative is offered, it is the responsibility of the vendor to identify any variations from this specification and provide details.
In this specification, where practical, US Customary (USC) units are included in brackets for information. The units do not necessarily represent a direct conversion of SI to USC units, or USC to SI units. Consideration has been given to the precision of the instrument making the measurement. For example, thermometers are typically marked in 1° increments, thus temperature values have been rounded to the nearest degree.
In this specification, calibrating an instrument refers to assuring the accuracy of the measurement. Accuracy is the degree of conformity of a measurement of a quantity to its actual or true value. Accuracy is related to precision, or reproducibility, of a measurement. Precision is the degree to which further measurements or calculations will show the same or similar results. Precision is characterized in terms of the standard deviation of the measurement. The results of calculations or a measurement can be accurate, but not precise, precise but not accurate, neither or both. A result is valid if it is both accurate and precise.
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Cements and Materials for Well Cementing
This document specifies requirements and gives recommendations for six classes of well cements, and two classes of composite well cements including their chemical and physical requirements, and procedures for physical testing.
This specification is applicable to well cement classes A, B, C, and D, which are the products obtained by grinding Portland cement clinker and, if needed, calcium sulfate (CaSO4) as an interground additive. Processing additives can be used in the manufacture of cement of these classes. Suitable set-modifying agents can be interground or blended during the manufacture of Class D cement. Annex B describes composite well cement classes K and L, which are the products obtained by intergrinding Portland cement clinker and one or more forms of CaSO4 with composite constituents, or by subsequent blending of separately produced Portland cement with separately processed composite constituents. Composite constituents are also specified in Annex B.
This specification is also applicable to well cement classes G and H, which are the products obtained by grinding clinker with no additives other than one or more forms of CaSO4, water, or chemical additives as required for chromium (VI) reduction.
When product is manufactured at a facility licensed by API and is intended to be supplied bearing the API Monogram, the requirements of Annex A shall apply.
This document contains metric SI and US customary oilfield units. For the purposes of this document, the conversion between the systems is not exact and has been intentionally rounded to allow for ease of use in calibration and measurement.
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document applies (including any addenda/errata). However, not all documents listed may apply to your specific needs. The body of the standard should be referred to for how these documents are specifically applied.
API Specification 13A, Specification for Drilling Fluid Materials
ASTM1 C109/C109M, Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens)
ASTM C114, Standard Test Methods for Chemical Analysis of Hydraulic Cement
ASTM C115, Standard Test Method for Fineness of Portland Cement by the Turbidimeter
1 ASTM International, 100 Barr Harbor Drive, West Conshohoken, PA 19428-2959, www.astm.org.