Cement compositions containing coarse barite, process for...

E - Fixed Constructions – 21 – B

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E21B 33/13 (2006.01) C04B 14/00 (2006.01) C04B 28/02 (2006.01) C09K 8/42 (2006.01)

Patent

CA 2510239

Cement comprising barite, a process for preparing such cement, and methods of cementing in a subterranean formation or well bore using such cement are provided. The cement is prepared by introducing coarse barite to the cement, the course barite comprising particles having a particle size primarily greater than about 125 microns. Preferably, 90 percent of the barite particles is greater than about 125 microns in size. The presence of the coarse barite in the cement causes the cement to have a relatively low viscosity. Introducing the barite to the cement also increases the density of the cement, thus rendering the cement capable of controlling high hydrostatic pressures in a well bore.

L'invention concerne un ciment comprenant de la barytine, un procédé de préparation de ce ciment ainsi que des procédés destinés à réaliser une cimentation dans une formation souterraine ou un puits de forage au moyen de ce ciment. Le ciment est préparé par introduction de barytine grossière dans le ciment, cette barytine grossière comprenant des particules présentant une taille initialement supérieure à environ 125 microns. De préférence, 90 % des particules de barytine présentent une taille supérieure à environ 125 microns. Du fait de la présence de barytine grossière dans le ciment, ce dernier présente une viscosité relativement faible. L'introduction de barytine dans le ciment permet également d'augmenter la densité du ciment, lequel peut ainsi supporter des pressions hydrostatiques élevées dans un puits de forage.

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