Wellbore fluids containing particulates having acid...

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/512 (2006.01) C09K 8/035 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2339101

The present invention relates to a wellbore fluid comprising a particulate material composed of the reaction product of: A) one or more water soluble organic compound possessing a molecular weight of less than 30,000 and possessing at least two hydroxyl groups, and B) any other organic compound(s) capable of forming acetal or hemiacetal cross-links with the hydroxyl groups of compound A. The invention relates also to the specific particulate material itself and to applications of the wellbore fluid of the invention for well processes such as drilling, under-reaming, completing, working over, sealing loss zones, sealing fractures, sealing cavities or other very high permeability conduits in a rock formation, or hydraulic fracturing to stimulate a hydrocarbon-producing zone.

La présente invention concerne une boue de forage renfermant une substance particulaire composée du produit de la réaction de A) un ou plusieurs composés organiques hydrosolubles qui présentent un poids moléculaire inférieur à 30000 et au moins deux groupes hydroxyles, et B) tout autre composé organique capable de former des réticulations acétaliques ou hémi-acétaliques avec lesdits groupes hydroxyles du composé A. Cette invention concerne également la substance particulaire elle-même, ainsi que des applications de cette boue de forage à des processus tels que le forage, l'élargissement, la complétion, le reconditionnement, le scellement de zones de perte, de fractures, de cavités, ou d'autres conduits à perméabilité très élevée dans une lithogenèse, ou la fracturation hydraulique destinée à stimuler une zone de production d'hydrocarbures.

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