초록 ▼

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. The macroemulsion, n

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. The macroemulsion, nanoemulsion, miniemulsion, microemulsion systems with excess oil or water or both or single phase microemulsion removes oil and solids from the deposited filter cake. In one non-limiting embodiment, the emulsion system (e.g. single phase microemulsion, nanoemulsion, or other emulsions) may be formed in situ (downhole) rather than produced or prepared in advance and pumped downhole. Skin damage removal from internal and external filter cake deposition can be reduced.

대표청구항 ▼

1. A method of cleaning oil-based mud (OBM) filter cake particles from a hydrocarbon reservoir wellbore comprising: drilling a wellbore in a hydrocarbon reservoir with an OBM;forming a filter cake of OBM particles over at least part of the wellbore;contacting the OBM and filter cake with at least on

1. A method of cleaning oil-based mud (OBM) filter cake particles from a hydrocarbon reservoir wellbore comprising: drilling a wellbore in a hydrocarbon reservoir with an OBM;forming a filter cake of OBM particles over at least part of the wellbore;contacting the OBM and filter cake with at least one surfactant, at least one co-surfactant and a polar liquid in the absence of a propionate and the absence of a co-solvent and forming in situ an in-situ fluid selected from the group consisting of a miniemulsion, a nanoemulsion, and a single phase microemulsion (Winsor IV), and thereby incorporating at least a portion of the oil in the filter cake particles into the in-situ fluid, where the co-surfactant is selected from the group consisting of alcohols, glycols, ethoxylated alcohols, ethoxylated glycols, ethoxylated phenols, propoxylated alcohols, propoxylated glycols, propoxylated phenols, ethoxylated and propoxylated alcohols, ethoxylated and propoxylated glycols, ethoxylated and propoxylated phenols, and combinations thereof. 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 and polyethoxylated, alcohols that have been polypropoxylated, alcohols that have been polyethoxylated; 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 and polyethoxylated sulfates, 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, and surfactants 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 in-situ fluid is a thermodynamically stable, macroscopically homogeneous mixture of at least three components, where the three components comprise: a polar phase from the polar liquid, 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 where the in-situ fluid further comprises an acid selected from the group consisting of mineral acids and organic acids. 8. The method of claim 7 further comprising generating the acid in situ. 9. A method of cleaning oil-based mud (OBM) filter cake particles from a hydrocarbon reservoir wellbore comprising: drilling a wellbore in a hydrocarbon reservoir with an OBM;forming a filter cake of OBM particles over at least part of the wellbore;pumping into the wellbore a gravel pack carrier brine comprising: sized gravel,at least one surfactant,at least one co-surfactant, anda polar liquid in the absence of added oil or solvent and in the absence of a propionate and the absence of a co-solvent;placing a gravel pack into the wellbore;contacting the OBM and filter cake with the gravel pack carrier brine and forming in situ an in-situ fluid selected from the group consisting of a miniemulsion, a nanoemulsion, and a single phase microemulsion (Winsor IV), and thereby incorporating at least a portion of the oil from the OBM into the in-situ fluid by solubilization without circulating the well;changing the wettability of the filter cake particles from oil-wet to water-wet;allowing the in-situ fluid to contact the filter cake for a period of time as a soak solution; andremoving a majority of the filter cake particles, where the co-surfactant is selected from the group consisting of alcohols, glycols, ethoxylated alcohols, ethoxylated glycols, ethoxylated phenols, propoxylated alcohols, propoxylated glycols, propoxylated phenols, ethoxylated and propoxylated alcohols, ethoxylated and propoxylated glycols, ethoxylated and propoxylated phenols, and combinations thereof. 10. The method of claim 9 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. 11. The method of claim 10 where in the surfactants, the nonionic surfactants are selected from the group consisting of alkyl polyglyco-sides, sorbitan esters, amine ethoxylates, diamine ethoxylates, methyl glucoside esters, polyglycerol esters , alkyl ethoxylates, alcohols that have been polypropoxylated and polyethoxylated, alcohols that have been polypropoxylated, alcohols that have been polyethoxylated; 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 and polyethoxylated sulfates, 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, and surfactants containing a non-ionic spacer-arm central extension and an ionic or nonionic polar group. 12. The method of claim 9 where the in-situ fluid further comprises brine containing salts selected from the group consisting of inorganic salts, organic salts and combinations thereof. 13. The method of claim 9 where the in-situ fluid is a thermodynamically stable, macroscopically homogeneous mixture. 14. The method of claim 9 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. 15. The method of claim 9 where the in-situ fluid further comprises an acid selected from the group consisting of mineral acids and organic acids. 16. The method of claim 15 further comprising generating the acid in situ. 17. A method of cleaning oil-based mud (OBM) filter cake particles from a hydrocarbon reservoir comprising: drilling a wellbore in a hydrocarbon reservoir with an OBM;forming a filter cake of OBM particles over at least part of the wellbore;contacting the OBM and filter cake with at least one surfactant, at least one co-surfactant and a brine in the absence of added oil or solvent and in the absence of a propionate and the absence of a co-solvent and forming in situ an in-situ fluid selected from the group consisting of a miniemulsion, a nanoemulsion, and a single phase microemulsion (Winsor IV), and thereby incorporating at least a portion of the oil in the filter cake particles into the in-situ fluid,where the in-situ fluid 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, and where the co-surfactant is selected from the group consisting of alcohols, glycols, ethoxylated alcohols, ethoxylated glycols, ethoxylated phenols, propoxylated alcohols, propoxylated glycols, propoxylated phenols, ethoxylated and propoxylated alcohols, ethoxylated and propoxylated glycols, ethoxylated and propoxylated phenols, and combinations thereof. 18. The method of claim 17 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. 19. The method of claim 18 where in the surfactants, the nonionic surfactants are selected from the group consisting of alkyl polyglyco-sides, sorbitan esters, amine ethoxylates, diamine ethoxylates, methyl glucoside esters, polyglycerol esters , alkyl ethoxylates, alcohols that have been polypropoxylated and polyethoxylated, alcohols that have been polypropoxylated, alcohols that have been polyethoxylated; 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 and polyethoxylated sulfates, 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, and surfactants containing a non-ionic spacer-arm central extension and an ionic or nonionic polar group. 20. The method of claim 17 where the in-situ fluid further comprises an acid selected from the group consisting of mineral acids and organic acids.