Method for controlling loss of drilling fluid

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/02 (2006.01) E21B 21/00 (2006.01) E21B 47/08 (2006.01)

Patent

CA 2689912

Methods for drilling and treating for lost returns continuously while drilling are provided. High fluid loss drilling fluid is used, along with particulate material that forms an immobile mass in hydraulic fractures to prevent their growth. The particulate material may be selected based on the predicted size of a hydraulic fracture, based on particle size to minimize fines, based on specific gravity to attain high solids content for a selected fluid density, and/or based on permeability of the particles to attain a high spurt loss.

L'invention porte sur des procédés de forage et de traitement des pertes de fluide de forage en continu lors du forage. Un fluide de forage à perte de fluide élevée est utilisé, en même temps qu'une matière particulaire qui forme une masse immobile dans des fractures hydrauliques pour empêcher leur croissance. La matière particulaire peut être choisie sur la base de la dimension prédite d'une fracture hydraulique, sur la base d'une dimension de particule pour rendre minimale les fines, sur la base du poids spécifique pour parvenir à une teneur en matières solides pour une densité de fluide spécifiée, et/ou sur la base de la perméabilité des particules pour parvenir à une perte au jaillissement élevée.

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