Cement compositions containing flexible, compressible beads...

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 28/02 (2006.01) C04B 20/00 (2006.01) C09K 8/42 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2513561

Cement compositions comprising flexible, compressible beads, processes for preparing such cement compositions, and methods of cementing in subterranean formations using such cement compositions. One or more flexible, compressible beads are mixed with the cement before pumping the cement into a well bore. The flexible, compressible beads are preferably composed of an elastomeric material such as a copolymer of methylmethacrylate and acrylonitrile; a terpolymer of methylmethacrylate, acrylonitrile, and dichloroethane; a styrene- divinylbenzene copolymer; and polystyrene. The flexible, compressible beads may be heated to expand the beads before mixing with the cement such that the ensuing cement composition will have a desired density. Non-flexible beads such as spherulites may also be added to the cement compositions.

L'invention concerne des compositions de ciment renfermant des billes souples et compressibles, des procédés de préparation de telles compositions de ciment, ainsi que des procédés de cimentation à mettre en oeuvre dans des formations souterraines et utilisant de telles compositions de ciment. Une ou plusieurs billes souples et compressibles sont mélangées avec le ciment avant le pompage de celui-ci dans un puits de forage. Les billes souples et compressibles sont, de préférence, composées d'un matériau élastomère, tel qu'un copolymère de méthylméthacrylate et acrylonitrile; un terpolymère de méthylméthacrylate, acrylonitrile et dichloroéthane; un copolymère de styrène-divinylbenzène; et du polystyrène. Les billes souples et compressibles peuvent être chauffées de manière à étendre celles-ci avant le mélange avec le ciment, afin que la composition de ciment ainsi obtenue possède une densité souhaitée. Des billes non souples, telles que des sphérulites, peuvent également être ajoutées dans les compositions de ciment.

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