Method of stabilising clay or shale

Details Method of stabilising clay or shale Method of stabilising clay or shale

E - Fixed Constructions

21

B

E21B 43/26 (2006.01) C09K 8/16 (2006.01) C09K 8/20 (2006.01) C09K 8/504 (2006.01) C09K 8/514 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2469051

A method of reducing the swelling of shale or clay encountered in a wellbore, the method comprising introducing into the wellbore a composition comprising: (a) a continuous aqueous phase; (b) a source of borate ions; (c) a source of ions selected from the group consisting of alkali metal ions, alkaline earth metal ions and ammonium ions; and (d) optionally a source of at least one sugar selected from the group consisting of monosaccharides and oligosaccharides having from 2 to 4 saccharide groups.

Cette invention concerne un procédé propre à réduire le foisonnement du schiste ou de l'argile dans un puits de forage. Ce procédé consiste à introduire dans un puits de forage une composition comprenant: (a) une phase aqueuse continue; (b) une source d'ions borate; (c) une source d'ions pris dans le groupe composé d'ions métalliques alcalins, d'ions métalliques alcalino-terreux et d'ions d'ammonium; et (d) éventuellement une source d'au moins un sucre pris dans le groupe composé de monosaccharides et d'oligosaccharides comprenant de 2 à 4 groupes saccharides.

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