Method of supporting fractures in geological formations and...

E - Fixed Constructions – 21 – B

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E21B 43/26 (2006.01) C09K 8/62 (2006.01) C09K 8/90 (2006.01) E21B 43/267 (2006.01) C09K 7/02 (1995.01)

Patent

CA 2071849

The addition of relatively small quantities of a bacterial cellulose to hydraulic fracturing fluids improves their rheological properties for hydraulic fracturing of geological formations. Proppant suspension is markedly improved and friction loss through well casings is significantly reduced, resulting in lower pumping energy requirements. Computer models also indicate that formation fractures will be propagated for greater distances as will the propped portion of the fracture. Normally only about 0.60-1.8 g of bacterial cellulose per liter of fracturing fluid is needed. A preferred bacterial cellulose is one made in agitated fermentors using mutation resistant strains of a bacterium from the genus Acetobacter,

L'addition de quantités relativement petites d'une cellulose bactérienne à des fluides de fracture hydraulique améliore leurs propriétés rhéologiques pour la cassure hydraulique de formations géologiques. Une suspension d'étançonnement est considérablement améliorée et les pertes de friction dans les cuvelages des puits sont réduites de manière significative, ce qui se traduit par des besoins en énergie de pompage moindres. Des modèles informatiques indiquent si les fractures de la formation se propageront sur des distances plus grandes que la partie étançonnée de la fracture. Normalement, uniquement environ 0,60 à 1,8 g de cellulose bactérienne par litre de fluide de fracture est nécessaire. Une cellulose bactérienne préférée est produite dans des cuves de fermentation avec agitateur en utilisant des souches résistantes à la mutation d'une bactérie provenant du genre Acetobacter.

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