Non-aqueous breaker fluids and methods of use thereof
AssigneeM-I L.L.C.
InventorsEugene Dakin, Chris Shepherd, Steven Young
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Abstract
A method of cleaning a wellbore drilled with an oil-based drilling fluid that forms an oil-based filter cake where the method includes: emplacing a breaker fluid into the wellbore, the breaker fluid comprising: a water-miscible non-aqueous fluid; at least one weighting salt; and at least one breaking agent; and shutting in the well for a period of time sufficient to initiate breaking of the oil-based filter cake is disclosed.
Claims26
A method of cleaning a wellbore drilled with an oil-based drilling fluid that forms an oil-based filter cake, the method comprising:
- emplacing a breaker fluid into the wellbore, the breaker fluid comprising:
- a water-miscible non-aqueous fluid;
- at least one weighting salt;
- and
- at least one breaking agent;
- and
- shutting in the well for a period of time sufficient to initiate breaking of the oil-based filter cake.
A method for completing a wellbore, comprising:
- drilling the wellbore with an oil-based drilling fluid to form an oil-based filter cake on the walls thereof;
- gravel packing at least one interval of the wellbore;
- emplacing a breaker fluid into the wellbore, the breaker fluid comprising:
- a water-miscible non-aqueous fluid;
- at least one weighting salt;
- and
- at least one breaking agent;
- and
- shutting in the well for a period of time sufficient to initiate breaking of the oil-based filter cake.
A breaker fluid, comprising:
- about 50 to 90 percent by weight of a non-aqueous base fluid comprising:
- a water-miscible non-aqueous fluid;
- at least one weighting salt;
- and
- about 10 to 50 percent by weight of a breaking agent selected at least one of an emulsifier, a fragmentation agent, an acid source, and a chelant.
Dependencies are inferred from the claim text.