Using Concrete Technology to Improve the Performance of Lightweight Cements
1997; Linguagem: Inglês
10.2118/39276-ms
AutoresÉric Moulin, Philippe Revil, Bipin Jain,
Tópico(s)Concrete and Cement Materials Research
ResumoAbstract To successfully cement across and isolate formations with low fracture gradients requires the use of lightweight cement slurries. Conventional lightweight slurries usually have a high water-to-solid ratio, which results in long waiting-on-cement times, limited compressive strength development, and a relatively permeable cement sheath subject to acid and brine attack. A new approach to designing cement slurries effectively decouples the physical properties of set cement from the slurry properties and density, resulting in high performance lightweight cement slurries that reduce rig time and the logistics and costs associated with using conventional slurry designs. This has been clearly demonstrated in the cases of completing in reservoirs with a low fracture gradient (eliminating the risk of block squeeze), replacement of two-stage cement jobs by a single stage, and the use of a single slurry to replace lead/tail cement and side-track plugs. Results are described from various field applications where the technology has been used.
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