API SPEC 10A-2019 pdf download.Cements and Materials for Well Cementing.
1 Scope 1.1 General This document specifies requirements and gives recommendations for six classes of well cements, including their chemical and physical requirements, and procedures for physical testing. Annex B informs about two more classes of composite well cements. 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 (CaSO 4 ) 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, which are the products obtained by intergrinding Portland cement clinker and one or more forms of CaSO 4 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 CaSO 4 , water, or chemical additives as required for chromium (VI) reduction. 1.2 Application of the API Monogram 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. 1.3 Use of Metric SI and US Customary Units 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. 2 Normative References 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). 3.1.6 cement class Designation for classification of well cement according to its intended use. 3.1.7 clinker Fused materials produced in the kiln during cement manufacturing that are interground with CaSO 4 to make cement. 3.1.8 compressive strength Measured strength of a set cement sample calculated by the force required to cause it to fail in compression, expressed as a force per unit of area. 3.1.9 free-fluid (free-water) Colored or colorless liquid that separates from a cement slurry under static conditions. 3.1.10 grade Designation achieved under the API system for denoting the sulfate resistance of a particular cement. 3.1.11 intergrinding A process involving grinding Portland cement clinker with suitable other components to produce finely divided dry material. 3.1.12 load frame Frame to place a load on cement samples for determining compressive strength of cement. 3.1.13 pressurized consistometer Device used to measure the thickening time of a cement slurry under temperature and pressure. 3.1.14 slurry container (slurry cup) Container in an atmospheric or pressurized consistometer used to hold the slurry for pre-conditioning purpose or for the thickening-time test. 3.1.15 thickening time Time after which the consistency of a cement slurry has become so high that the slurry is considered unpumpable. NOTE The results of a thickening-time test provide an indication of the length of time a cement slurry remains pumpable under the test conditions. 4 Requirements 4.1 Specification, Chemical, and Physical Requirements 4.1.1 Classes and Grades 22.214.171.124 General Well cements shall be specified using the classes A, B, C, D, G, or H and the grades ordinary (O), moderate sulfate-resistant (MSR), and high sulfate-resistant (HSR). Composite well cements shall be specified using classes K and L, consisting of Portland cements and additional composite constituents according to Annex B. A well cement that has been manufactured and supplied in accordance with this specification may be mixed and placed in the field using alternate water ratios and/or additives. It is not intended that manufacturing compliance with this specification be based on such field conditions. Processing additives, set modifying agents, or chemical additives used to reduce chromium (VI) shall not prevent a well cement from performing its intended functions. 126.96.36.199 Class A This product is obtained by grinding clinker that consists of hydraulic calcium silicates and contains one or more forms of CaSO 4 as an interground additive. Processing additives used in the manufacture of Class A cement shall meet the requirements given in ASTM C465. NOTE This product is intended for use when special properties are not required and is available only in O grade, similar to the requirements given in ASTM C1 50 for Type I cement.