Cement compositions for high temperature applications
AssigneeSchlumberger Technology Corporation
InventorsVéronique Barlet-Gouedard, Chrystel Cambus, Samuel Danican, Erik Nelson, Bruno Goffe
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Abstract
In a process to design high temperature cement sluries, the temperature stable phases (anorthite, wairakite) are selected; aluminum modifiers and silica oxides are added to the dry cement so that the elemental composition of the blend corresponds to the phases selected; the control of the particle size distribution and the relative amount of those minerals allow their addition at high concentration while leaving the slurry easily mixable and pumpable; and the kinetics of the targeted phases formation is then controlled by adjusting the crystallinity and the particles sizes of the different solids.
Claims11
A pumpable cement slurry, comprised of water and particulate solids, including cement and mineral oxides, intended to be exposed to a temperature range between about 250° C. and 900° C., wherein:
- (i) said cement is a Portland cement or an aluminum enriched Portland cement;
- (ii) said mineral oxides comprise:
- up to 190% by mass of cement (BMOC) kaolin, calcinations products of kaolin, metakaolin or calcination products of metakaolin,
- up to 80% by BMOC silica,
- up to 72% BMOC fly ash;
- (iii) all particulate materials have discrete particle sizes so that the packing of the particulate materials is optimized;
- (iv) the slurry density ranges from about 1.40 g/cm3 to 1.94 g/cm3;
- and
- (v) the mineralogical bulk oxide composition of the particulate solids falls within the margarite-quartz-pectolite triangle within the Ca—Al—Si ternary diagram and promotes the formation of anorthite at said temperature range.
A pumpable cement slurry, comprised of water and particulate solids, including cement and mineral oxides, intended to be exposed to a temperature range between about 250° C. and 900° C., wherein:
- (i) said cement is a Portland cement or an aluminum enriched Portland cement;
- (ii) said mineral oxides comprise:
- up to 190% by mass of cement (BMOC) kaolin, calcinations products of kaolin, metakaolin or calcination products of metakaolin,
- up to 80% by BMOC silica,
- up to 72% BMOC fly ash;
- (iii) said particulate solids include low-density particles with a specific gravity less than 0.8;
- (iv) all particulate materials have discrete particle sizes so that the packing of the particulate materials is optimized;
- (v) the slurry density ranges from about 1.40 g/cm3 to 1.94 g/cm3;
- and
- (vi) the mineralogical bulk oxide composition of the particulate solids falls within the margarite-quartz-pectolite triangle within the Ca—Al—Si ternary diagram and promotes the formation of anorthite at said temperature range.
Dependencies are inferred from the claim text.