Well treatment fluid compositions and methods for their use

Details Well treatment fluid compositions and methods for their use Well treatment fluid compositions and methods for their use

C - Chemistry, Metallurgy

09

K

C09K 8/88 (2006.01) C09K 8/68 (2006.01) E21B 43/25 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2432160

A well treatment fluid composition comprises a solvent (such as water), a polymer soluble or hydratable in the solvent, a crosslinking agent, an inorgnaic breaking agent, and an ester compound,. Preferably, the hydratable polymer is a polysaccharide, such as galactomannan, cellulose, or derivatives thereof. The crosslinking agent is preferably a borate, titanate, or zirconium- containing compound. The inorganic breaking agent is preferably a metal-based oxidizing agent, such as an alkaline ear metal or transition metal-based oxidizing agent. The ester compound is preferably an ester of polycarboxylic acid, such as an ester of oxalate, citrate, or ethylenediamine tetraacetate. One example of a suitable ester compound is acetyl triethyl citrate.

L'invention concerne une composition fluide de traitement de puits, qui comprend un solvant (tel que l'eau), un polymère soluble ou pouvant être hydraté dans le solvant, un agent de réticulation, un agent de fragmentation inorganique, et un composé ester. De préférence, le polymère pouvant être hydraté est un polysaccharide, tel qu'un galactomannan, une cellulose ou des dérivés de ceux-ci. L'agent de réticulation est de préférence un borate, un titanate, ou un composé contenant du zirconium. L'agent de fragmentation inorganique est de préférence un agent oxydant à base de métal, tel un métal terreux alcalin ou un agent oxydant à base de métal de transition. Le composé ester est de préférence un ester d'acide polycarboxylique, tel qu'un ester d'oxalate, de citrate ou d'éthylène diamine tétra acétate. Un exemple de composé ester adéquat est un citrate d'acétyl-thriéthyle.

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