New and improved drilling fluids and additives therefor

Details New and improved drilling fluids and additives therefor New and improved drilling fluids and additives therefor

C - Chemistry, Metallurgy

09

K

C09K 8/90 (2006.01) C09K 8/08 (2006.01) C09K 8/514 (2006.01) E21B 33/138 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2326714

A process and composition are provided for permeability reduction in a hydrocarbon-bearing formation to improve hydrocarbon recovery therefrom. A moderately epichlorohydrin cross-linked, non- hydroxylpropylated starch is derived from high amylopectin waxy maize starch for use in drilling, workover and completion fluids. The starch is combined with xanthan gum and used in solutions of fresh water, non-saturated brine or saturated brine containing sized salt particles, typically sodium chloride, of various sizes, or sized calcium carbonate, or a combination of size salt and sized calcium carbonate.

L'invention concerne un procédé et une composition d'imperméabilisation d'une formation de gisement d'hydrocarbures pour améliorer l'extraction d'hydrocarbures de cette formation. Un amidon non hydroxylpropylé à réticulation par épichlorohydrine modérée est dérivé d'un amidon de maïs cireux à amylopectine élevée s'utilisant dans les fluides de forage, de reconditionnement et de complétion. L'amidon est combiné à une gomme xanthane et utilisé dans des solutions d'eau fraîche, de saumure non saturée ou de saumure saturée contenant des particules de sel calibrées, en général du chlorure de sodium de différentes tailles ou du carbonate de calcium calibré, ou une combinaison de sel calibré et de carbonate de calcium calibré.

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