CEMENTITIOUS COMPOSITIONS AND CEMENTITIOUS SLURRIES FOR PERMANENTLY PLUGGING ABANDONED WELLS AND PROCESSES AND METHODS THEREFOR

摘要

A dry cementitious composition which when slurried withwater produces an economical hydraulic cementitious slurryfor closing abandoned wells. The dry cementitiouscomposition is a cement/CKD blend as the major componentwith a weight ratio of parts cement to parts of CKD betweenabout 2/3 and about 3/1. Hydraulic cementitious slurrieswhen cured can produce hard cementitious bodies which willmeet or exceed the API specification for a competent hardplug. A process for blending the cement and CKD duringtransit from the cement source to the off-load site withoutrequiring further blending after off-loading. Methods areprovided for determining the formulation having the cheapestcost per unit volume of hydraulic cementitious slurrythereby enabling competitive quotes based on cf of hydrauliccementitious slurry required.