Increased rate of penetration from low rheology wellbore fluids

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/02 (2006.01)

Patent

CA 2663117

A method of increasing a rate of penetration when drilling as compared to drilling with a baseline drilling fluid comprising an API-grade barite weighting agent and having a given sag, settling rate, density, flow rate, and pressure drop through a wellbore, comprising: circulating a drilling fluid comprising a base fluid and a micronized weighting agent through the wellbore; wherein the drilling fluid is characterized as having an equivalent density, an equivalent or lower settling rate, and an equivalent or lower sag than the baseline drilling fluid; wherein the circulating is at a higher flow rate than the baseline drilling fluid flow rate; and wherein the circulating results in an equivalent or lower pressure drop through the wellbore.

L'invention concerne un procédé permettant d'augmenter la vitesse de pénétration lors d'un forage comparé à un forage effectué avec un fluide de forage produit de base comprenant un agent alourdissant de barite de qualité API et possédant un affaissement, une vitesse de sédimentation, une densité, un débit et une chute de pression donnés dans un puits de forage. Ce procédé consiste : à faire circuler un fluide de forage comprenant un fluide de base et un agent alourdissant micronisé à travers le puits de forage, ce fluide de forage étant caractérisé en ce qui le possède une densité équivalente, une vitesse de sédimentation équivalente ou plus faible et un affaissement équivalent ou plus faibles que le fluide de forage produit de base, la circulation étant effectuée à un débit supérieur au débit de fluide de forage produit de base et la circulation donnant une chute de pression équivalente ou inférieure dans le puits de forage.

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