Microemulsions to convert OBM filter cakes to WBM filter cakes having filtration control
First Claim
1. A thermodynamically stable, macroscopically homogeneous, single phase microemulsion (SPME) comprising:
- a polar phase;
a nonpolar phase;
a surfactant; and
a water-soluble filtration control additive selected from the group consisting of solid particulates, polymers and mixtures thereof.
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Accused Products
Abstract
Single phase microemulsions improve the removal of filter cakes formed during drilling with oil-based muds (OBMs). The single phase microemulsion removes oil and solids from the deposited filter cake. Optionally, an acid capable of solubilizing the filter cake bridging particles may also be used with the microemulsion. In one non-limiting embodiment the acid may be a polyamino carboxylic acid. Skin damage removal from internal and external filter cake deposition can be reduced. In another optional embodiment, the single phase microemulsion may contain a filtration control additive for delaying the filter cake removal, destruction or conversion.
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Citations
17 Claims
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1. A thermodynamically stable, macroscopically homogeneous, single phase microemulsion (SPME) comprising:
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a polar phase; a nonpolar phase; a surfactant; and a water-soluble filtration control additive selected from the group consisting of solid particulates, polymers and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A thermodynamically stable, macroscopically homogeneous, single phase microemulsion (SPME) comprising:
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a polar phase; a nonpolar phase; a surfactant selected from the group consisting of non-ionic surfactants, anionic surfactant, cationic surfactants and amphoteric surfactants; and from about 0.1 to about 10 lb/bbl, based on the SPME, of a water-soluble filtration control additive selected from the group consisting of solid particulates, polymers and mixtures thereof. - View Dependent Claims (9, 10, 11, 12)
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13. A thermodynamically stable, macroscopically homogeneous, single phase microemulsion (SPME) comprising:
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a polar phase; a nonpolar phase; a surfactant; and from about 0.1 to about 10 lb/bbl, based on the SPME, of a water-soluble filtration control additive selected from the group consisting of sized salts, hematite, ilmenite, manganese tetroxide, and mixtures thereof, and where the water-soluble polymers are selected from the group consisting of natural and synthetic polymers and copolymers and mixtures thereof. - View Dependent Claims (14, 15, 16, 17)
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Specification