Variable density drilling mud

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/03 (2006.01) E21B 21/08 (2006.01)

Patent

CA 2570263

One embodiment of the invention is a variable density drilling mud comprising compressible particulate material in the drilling mud wherein the density of the drilling mud changes in response to pressure changes at depth. A second embodiment is a method for varying drilling mud density. The method comprises estimating the pore pressure and fracture gradient, and choosing a drilling mud with compressible materials wherein the effective mud weight of the drilling mud remains between the pore pressure and the fracture gradient in at least one interval of the well bore. A third embodiment is an apparatus for drilling a wellbore.

Un mode de réalisation de la présente invention concerne une boue de forage à densité variable comprenant une matière particulaire compressible dans la boue de forage, la densité de la boue de forage variant en réponse aux variations de pression selon la profondeur. Un deuxième mode de réalisation de la présente invention concerne un procédé permettant de faire varier la densité de la boue de forage. Ce procédé consiste à estimer la pression interstitielle et le gradient de fracture, puis à sélectionner une boue de forage avec des matières compressibles, la masse utile de la boue de forage restant entre la pression interstitielle et le gradient de fracture dans au moins un intervalle du puits de forage. Un troisième mode de réalisation de la présente invention concerne un dispositif destiné au forage d'un puits.

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