Using Alternative Sources of Oilwell Cement

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA survey of cement manufacturers in the Asia Pacific Region revealed that only five companies produce a certified API Class G cement. Because of this, certain countries have been forced to import cement and in many cases ship it great distances. In some situations, API Class G cement can cost three times more than local construction cement. While the authors believe that the API Monogram is an excellent benchmark for oilwell cement, the question is -is it necessary to preclude good local cements from use simply because they are not certified. After all, the key issues for oilwell cement are predictability and performance, not certification In the absence of local API Class G cement, the authors propose two ways to use local cement in oilwell applications. First, work with existing construction cement companies to develop cements that consistently meet specifications of the desired API Class and use it in the field. Second, when and where it is applicable, use construction cement for oilwell cementing. The authors are implementing both techniques successfully in parts of South East Asia. This paper presents historical and technical background as well as laboratory data to support the use of local cements as an alternative to imported API Class G cement. Also, presented are several case studies on the use of local cement in oilwell applications as a means to save drilling costs.