00-03_cementing.htm (Mar-2000)
The 2000 Cementing Supplement is a comprehensive listing of cementing products and additives available from major suppliers. This most recent update now comprises seven companies How To Use This Reference Listings reflect available cement additives from seven service companies. Products are grouped into functional categories. Some products are unique to a company, and many are protected by patent rights or other legal means. They may be chemically similar, but not identical, and provide comparable performance in cement slurry formulations. Exact equivalency is not implied. Where applicable, products are subdivided into groups having similar performance within each functional category. Performance groups have been subdivided to reflect significant differences in chemical nature of additives and emphasize uniqueness within each company's product line. What cannot be different cements, or performance variations resulting from different sources of the same material around the world. Materials should be tested according to accepted procedures to ensure that performance requirements are met. Also, users are cautioned that it is generally not possible or prudent to make direct "translations" of cement formulations between service companies based solely on additive descriptions. Products are grouped in 15 functional categories: Temperature has a significant effect on many cementing additives and is the single most important variable in affecting cement hydration. This is particularly true for retarders, but also applies to fluid loss control additives, anti-gas migration, expanding and other agents. Salt tolerance is particularly important in fluid loss control additive selection. Where applicable, this reference includes temperature range groupings, salt tolerance and other variables critical to additive performance. Temperature and salt tolerance are broad groupings and actual performance may vary somewhat in formulations and well conditions. Important note. Fluid loss control additives are listed according to maximum temperature and salt tolerance for that product. For example, if an additive is shown to be effective up to about 250ºF in the presence over 18% salt (by weight of mix water), it is very likely that this product is also effective at higher temperatures with lower salt concentrations. There are several examples of this in the table. Finally, if a company does not have an equivalent to a competitor's product listing, it does not mean that the company cannot come up with a cement formulation that achieves similar performance. Our recommendation is to call the company, describe the application or problem and let them work on a solution. Even though additive technology has advanced, it is still best applied with a measure of experience.
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