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Nanoemulsion, macroemulsions, miniemulsions, microemulsion systems with excess oil or water or both (Winsor I, II or III phase behavior) or single phase microemulsions (Winsor IV) improve the removal of filter cakes formed during hydrocarbon reservoir wellbore drilling with OBM. Such filter cakes an

Nanoemulsion, macroemulsions, miniemulsions, microemulsion systems with excess oil or water or both (Winsor I, II or III phase behavior) or single phase microemulsions (Winsor IV) improve the removal of filter cakes formed during hydrocarbon reservoir wellbore drilling with OBM. Such filter cakes and their particles can contact, impact and affect the movement of the drill string undesirably resulting in a “stuck pipe” condition. The macroemulsion, nanoemulsion, miniemulsion, microemulsion systems with excess oil or water or both or single phase microemulsion removes oil and solids from the filter cake, thereby releasing the drill string from its stuck condition. In one non-limiting embodiment, the emulsion system may be formed in situ (downhole) rather than produced or prepared in advance and pumped downhole.

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1. A method for releasing a stuck drill string from a hydrocarbon reservoir wellbore comprising: drilling a wellbore with a drill string in a hydrocarbon reservoir with an OBM;forming a filter cake of OBM particles over at least part of the wellbore, which filter cake contacts the drill string to in

1. A method for releasing a stuck drill string from a hydrocarbon reservoir wellbore comprising: drilling a wellbore with a drill string in a hydrocarbon reservoir with an OBM;forming a filter cake of OBM particles over at least part of the wellbore, which filter cake contacts the drill string to inhibit movement of the drill string;contacting the OBM and filter cake with a composition for a period of time sufficient to remove at least a portion of the OBM filter cake particles to permit free movement of the drill string, where the composition comprises at least one surfactant and water; andforming in situ an in-situ fluid selected from the group consisting of a water continuous miniemulsion, a water continuous nanoemulsion, and a bi-continuous single phase microemulsion (Winsor IV), where the in-situ fluid further comprises an acid selected from the group consisting of mineral acids, acetic acid, formic acid, polyamino carboxylic acids, salts of these acids and mixtures thereof, and therebyincorporating at least a portion of the oil in the filter cake particles into the in-situ fluid. 2. The method of claim 1 where the at least one surfactant is selected from the group consisting of non-ionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants, surfactants containing a non-ionic spacer-arm central extension and an ionic or nonionic polar group, and mixtures thereof. 3. The method of claim 2 where in the surfactants: the nonionic surfactants are selected from the group consisting of alkyl polyglycosides, sorbitan esters, amine ethoxylates, diamine ethoxylates, methyl glucoside esters, polyglycerol esters, alkyl ethoxylates, alcohols that have been polypropoxylated, alcohols that have been ethoxylated, and alcohols that have been propoxylated and ethoxylated;the anionic surfactants are selected from the group consisting of alkali metal alkyl sulfates, alkyl or alkylaryl sulfonates, linear or branched alkyl ether sulfates and sulfonates, alcohol polypropoxylated sulfates, alcohol polyethoxylated sulfates, alkyl or alkylaryl disulfonates, alkyl disulfates, alkyl sulphosuccinates, alkyl ether sulfates, linear and branched ether sulfates;the cationic surfactants are selected from the group consisting of arginine methyl esters, alkanolamines, and alkylenediamides, and mixtures thereof, andsurfactants containing a non-ionic spacer-arm central extension and an ionic or nonionic polar group. 4. The method of claim 1 where the in-situ fluid further comprises brine containing salts selected from the group consisting of inorganic salts, organic salts and combinations thereof. 5. The method of claim 1 where the bi-continuous single phase microemulsion, water continuous miniemulsion, or water continuous nanoemulsion is a macroscopically homogeneous mixture of at least three components, where the three components comprise: a polar phase from the water, a nonpolar phase from the OBM or filter cake and the at least one surfactant. 6. The method of claim 1 where the filter cake particles are selected from the group consisting of calcium carbonate, hematite, ilmenite, manganese tetroxide, manganous oxide, iron carbonate, magnesium oxide, barium sulfate, and mixtures thereof. 7. The method of claim 1 further comprising generating the acid in situ. 8. A method for releasing a stuck drill string from a hydrocarbon reservoir wellbore comprising: drilling a wellbore with a drill string in a hydrocarbon reservoir with an OBM;forming a filter cake of OBM particles over at least part of the wellbore, which filter cake contacts the drill string to inhibit movement of the drill string;contacting the OBM and filter cake with a composition for a period of time sufficient to remove at least a portion of the OBM filter cake particles to permit free movement of the drill string, where the composition comprises at least one surfactant and water, in an absence of introduced oil or solvent; andforming in situ an in-situ fluid selected from the group consisting of a water continuous miniemulsion, a water continuous nanoemulsion, and a bi-continuous single phase microemulsion (Winsor IV), where the in-situ fluid further comprises an acid selected from the group consisting of mineral acids, acetic acid, formic acid, polyamino carboxylic acids, salts of these acids and mixtures thereof, and thereby,incorporating at least a portion of the oil in the filter cake particles into the in-situ fluid, where the at least one surfactant is selected from the group consisting of non-ionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants, surfactants containing a non-ionic spacer-arm central extension and an ionic or nonionic polar group, and mixtures thereof. 9. The method of claim 8 where in the surfactants: the nonionic surfactants are selected from the group consisting of alkyl polyglycosides, sorbitan esters, amine ethoxylates, diamine ethoxylates, methyl glucoside esters, polyglycerol esters, alkyl ethoxylates, alcohols that have been polypropoxylated, alcohols that have been ethoxylated, and alcohols that have been propoxylated and ethoxylated;the anionic surfactants are selected from the group consisting of alkali metal alkyl sulfates, alkyl or alkylaryl sulfonates, linear or branched alkyl ether sulfates and sulfonates, alcohol polypropoxylated sulfates, alcohol polyethoxylated sulfates, alkyl or alkylaryl disulfonates, alkyl disulfates, alkyl sulphosuccinates, alkyl ether sulfates, linear and branched ether sulfates;the cationic surfactants are selected from the group consisting of arginine methyl esters, alkanolamines, and alkylenediamides, and mixtures thereof, andsurfactants containing a non-ionic spacer-arm central extension and an ionic or nonionic polar group. 10. The method of claim 8 where the bi-continuous single phase microemulsion, water continuous miniemulsion or water continuous nanoemulsion is a, macroscopically homogeneous mixture of at least three components, where the three components comprise: a polar phase from the water, a nonpolar phase from the OBM or filter cake and the at least one surfactant. 11. The method of claim 8 where the filter cake particles are selected from the group consisting of calcium carbonate, hematite, ilmenite, manganese tetroxide, manganous oxide, iron carbonate, magnesium oxide, barium sulfate, and mixtures thereof. 12. The method of claim 8 further comprising generating the acid in situ. 13. A method of releasing a stuck drill string from a hydrocarbon reservoir wellbore comprising: drilling a wellbore with a drill string in a hydrocarbon reservoir with an OBM;forming a filter cake of OBM particles over at least part of the wellbore, which filter cake contacts the drill string to prevent or undesirably inhibit movement of the drill string;contacting the OBM and filter cake with a composition for a period of time sufficient to remove at least a portion of the OBM filter cake particles to permit free movement of the drill string, where the composition at least one surfactant and a brine, in the absence of a co-solvent, in an absence of introduced oil or solvent; andforming in situ an in-situ fluid selected from the group consisting of a brine continuous miniemulsion, a brine continuous nanoemulsion, and a bi-continuous single phase microemulsion (Winsor IV), where the in-situ fluid further comprises an acid selected from the group consisting of mineral acids, acetic acid, formic acid, polyamino carboxylic acids, salts of these acids and mixtures thereof, and therebyincorporating at least a portion of the oil in the filter cake particles into the in-situ fluid; where the bi-continuous single phase microemulsion, brine continuous miniemulsion, or brine continuous nanoemulsion is a thermodynamically stable, macroscopically homogeneous mixture of at least three components, where the three components comprise: brine, a nonpolar phase from the OBM or filter cake and the at least one surfactant, and where the filter cake particles are selected from the group consisting of calcium carbonate, hematite, ilmenite, manganese tetroxide, manganous oxide, iron carbonate, magnesium oxide, barium sulfate, and mixtures thereof. 14. The method of claim 13 where the at least one surfactant is selected from the group consisting of non-ionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants, surfactants containing a non-ionic spacer-arm central extension and an ionic or nonionic polar group, and mixtures thereof. 15. The method of claim 14 where in the surfactants: the nonionic surfactants are selected from the group consisting of alkyl polyglycosides, sorbitan esters, amine ethoxylates, diamine ethoxylates, methyl glucoside esters, polyglycerol esters, alkyl ethoxylates, alcohols that have been polypropoxylated, alcohols that have been ethoxylated, and alcohols that have been propoxylated and ethoxylated;the anionic surfactants are selected from the group consisting of alkali metal alkyl sulfates, alkyl or alkylaryl sulfonates, linear or branched alkyl ether sulfates and sulfonates, alcohol polypropoxylated sulfates, alcohol polyethoxylated sulfates, alkyl or alkylaryl disulfonates, alkyl disulfates, alkyl sulphosuccinates, alkyl ether sulfates, linear and branched ether sulfates;the cationic surfactants are selected from the group consisting of arginine methyl esters, alkanolamines, and alkylenediamides, and mixtures thereof, andsurfactants containing a non-ionic spacer-arm central extension and an ionic or nonionic polar group.