C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/524 (2006.01) C09K 8/36 (2006.01) E21B 21/06 (2006.01) E21B 21/14 (2006.01) E21B 37/06 (2006.01)
Patent
CA 2603751
A method of cleaning a wellbore prior to the production of oil or gas, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake is disclosed. The method may include circulating a breaker fluid into the wellbore, where the breaker fluid includes a non-oleaginous internal phase and an oleaginous external phase, where the non-oleaginous phase includes a water soluble polar organic solvent, a hydrolysable ester of a carboxylic acid, and a weighting agent, and the oleaginous external phase includes an oleaginous fluid and an emulsifier, and where the hydrolysable ester is selected so that upon hydrolysis an organic acid is released and the invert emulsion of the filter cake breaks.
La présente invention concerne un procédé pour nettoyer un puits de forage avant la production de pétrole ou de gaz, le puits de forage ayant été foré par un forage à émulsion inverse qui forme un gâteau de filtrage d'émulsion inverse. Le procédé peut comprendre la mise en circulation d'un liquide de rupture à l'intérieur du puits, le liquide de rupture comprenant une phase interne non oléagineuse et une phase externe oléagineuse, la phase interne non oléagineuse comprenant un solvant organique polaire soluble dans l'eau, un ester hydrolysable d'acide carboxylique, et un agent d'alourdissement, et la phase externe oléagineuse comprenant un liquide oléagineux et un émulsifiant, l'ester hydrolysable étant sélectionné de sorte que l'hydrolyse provoque la libération d'un acide organique et la rupture de l'émulsion inverse du gâteau de filtrage.
Luyster Mark
Ravitz Raymond D.
Svoboda Charles
Kirby Eades Gale Baker
M-I Llc
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