Thixotropic materials

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/46 (2006.01) C04B 14/10 (2006.01) C04B 28/00 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2209516

A settable thixotropic material comprises a thixotrope and a settable substance, the material being capable of gelling reversibly in a gelling time of less than 60 seconds. The thixotrope conveniently comprises a fine grained clay, especially smectite clays, e.g. hectorites. It is preferred to use synthetic smectite type clay colloids, and good results have been obtained with the synthetic clay known as Laponite RDS. The settable material conveniently comprises cement, particularly Portland cement. The thixotropic material finds use generally in oilwell applications, e.g. to plug lost circulation zones, to repair damaged or corroded casing, as grouts, and to limit annular gas migration. The material also finds particular application in techniques for completion of horizontal wells completed with slotted or pre-drilled liners, as described in International Application WO-95/00739.

La présente invention concerne une matière thixotrope durcissablee constituée d'une substance thixotrope et durcissable, ladite matière étant capable de se gélifier de façon réversible en un temps de prise inférieur à 60 secondes. Ce thixotrope comprend idéalement une argile à grains fins, en l'occurrence telle que des argiles à smectite comme les hectorites. On préfère utiliser des colloïdes d'argiles de type smectite synthétique, de bons résultats ayant été obtenus avec une argile synthétique de type "Laponite RDS". La matière durcissable comprend idéalement du ciment, en l'occurrence du portland. Cette matière thixotrope convient particulièrement aux applications de forages pétroliers, pour le colmatage de zones de pertes de boues, pour la réparation des tubages de revêtement endommagés ou corrodés, et pour la limitation des migrations gazeuses annulaires. Cette matière convient également particulièrement à des applications concernant des techniques de finition des forages horizontaux mettant en oeuvre des colonnes crépinées à fente ou des colonnes préalablement percées, conformément à la description de la Demande Internationale WO-95/00739.

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