Water based completion and displacement fluid and method of use
AssigneeM-I L.L.C.
InventorsCharles Svoboda, Raymond Ravitz, Mark Luyster
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Abstract
A method of cleaning a wellbore prior to the production of oil or gas is disclosed, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake. The method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid includes an aqueous fluid, a water soluble polar organic solvent, a hydrolysable ester of a carboxylic acid, and a weighting age, 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.
Claims24
A method of cleaning a wellbore, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake, the method comprising:
- circulating a breaker fluid into the wellbore, the breaker fluid comprising:
- an aqueous fluid;
- a water soluble polar organic solvent;
- a hydrolysable ester of a carboxylic acid;
- and
- a weighting agent;
- and
- wherein the hydrolysable ester is selected so that upon hydrolysis an organic acid is released and the invert emulsion of the filter cake breaks.
A method of producing a hydrocarbon from a formation, the method comprising:
- drilling the formation with an invert emulsion drilling mud;
- performing at least one completion operation in the wellbore;
- emplacing a water-based breaker fluid in the wellbore, the breaker fluid comprising:
- an aqueous fluid;
- a water soluble polar organic solvent;
- a hydrolysable ester of a carboxylic acid;
- and
- a weighting agent;
- and
- shutting the well for a predetermined time to allow the hydrolysis of the ester and the breaking of the invert emulsion filter cake.
A solution, comprising:
- an aqueous fluid;
- a water soluble polar organic solvent;
- a hydrolysable ester of a carboxylic acid;
- and
- a weighting agent.
Dependencies are inferred from the claim text.