C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 28/04 (2006.01) C04B 7/00 (2006.01) C04B 7/02 (2006.01) E21B 33/14 (2006.01)
Patent
CA 2406183
The present invention concerns cementing compositions for an oil well or the like, based on a Portland cement, silica and alumina, wherein the mineralogical composition of the cement matrix is included in the Si-Ca-Al triangle in one of the margarite- haüyne-[epidote/pumpellyite], haüyne-prehnite-[epidote/pumpellyite] and haüyne- prehnite-pectolite composition triangles. More particularly, the cementing compositions of the invention are suitable for cementing wells subjected to high temperatures and to chemical attack by brines, and are more suitable when the brine - or a saline formulation close to that of the brine - is used as the mixing water.
La présente invention concerne des compositions de cimentation destinées à un puits de pétrole ou analogue, se basant sur un ciment Portland, de la silice et de l'alumine, la composition minéralogique de la matrice de ciment étant comprise à l'intérieur du triangle Si-Ca-Al dans l'un des triangles margarite-haüyne-[épidote/pumpellyite], haüyne-préhnite-[épidote/pumpellyite] et à composition haüyne-préhnite-pectolite. Plus particulièrement, les compositions de cimentation de l'invention conviennent à la cimentation de puits exposés à des températures élevées et à des attaques chimiques par des saumures, et sont encore plus appropriées lorsque la saumure - ou la formulation saline proche de celle de la saumure - est utilisée comme eau de gâchage.
Barlet-Gouedard Veronique
Goffe Bruno
Schlumberger Canada Limited
Smart & Biggar
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