Methods and compositions for delaying the crosslinking of...

Details Methods and compositions for delaying the crosslinking of... Methods and compositions for delaying the crosslinking of...

E - Fixed Constructions

21

B

E21B 43/26 (2006.01) C09K 8/08 (2006.01) C09K 8/20 (2006.01) C09K 8/514 (2006.01) C09K 8/575 (2006.01) C09K 8/68 (2006.01) E21B 33/138 (2006.01) E21B 43/02 (2006.01)

Patent

CA 2328235

Permeable subterranean underground formations and fractures can be sealed using lost circulating material fluids having borate and metallic cross-linked polysaccharide gels that are cross-linked in the well bore. Compositions and methods are illustrated whereby lost circulation material solids can be mixed in a mixing tank on the surface with a cross-linkable polysaccharide and a cross-linking agent under conditions whereby the lost circulating material fluid can be pumped into the well bore before undergoing gelation. Once the lost circulation material fluid equilibrates to the reservoir temperature the polysaccharide component of the lost circulation material fluid will cross- link.

On peut fermer de manière étanche des fractures et des formations souterraines perméables, au moyen de fluides de pertes de circulation comprenant des gels de polysaccharide réticulé métallique et de borate, gels qui sont réticulés dans le puits de forage. L'invention concerne des compositions et des procédés permettant de mélanger des solides de matériau de pertes de circulation, dans une cuve de mélangeage, à la surface, avec un polysaccharide réticulable et un agent de réticulation, dans des conditions dans lesquelles le fluide de matériau de pertes de circulation peut être envoyé par pompage dans le puits, avant sa gélification. Une fois le fluide de matériau de pertes de circulation équilibré par rapport à la température du réservoir, le composant polysaccharide du fluide de matériau de perte de circulation se transforme par réticulation.

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