초록 ▼

A water-based fluid, containing: a non-ionic surfactant, which is stable in a temperature range from 10 to 90° C. and soluble in water; and a salt, wherein the non-ionic surfactant contains an alkyl polyglucoside selected from the group consisting of a C8 alkyl polyglucoside, a C10 alkyl polyglucosi

A water-based fluid, containing: a non-ionic surfactant, which is stable in a temperature range from 10 to 90° C. and soluble in water; and a salt, wherein the non-ionic surfactant contains an alkyl polyglucoside selected from the group consisting of a C8 alkyl polyglucoside, a C10 alkyl polyglucoside, and mixtures thereof, and the salt is present, and is present in an amount up to 60%. In addition, a process for preventing the formation of a W/O inverse emulsion or resolving a W/O inverse emulsion that has already formed in an oil well in which an oil-based mud has been employed by injecting the water-based fluid into the oil well.

대표청구항 ▼

1. A process, comprising: preventing the formation of a W/O inverse emulsion by injecting a water-based fluid into an oil well comprising an oil-based mud, thereby contacting the water-based fluid with the oil-based mud, which is present in the well as a residue or a filtrate from a porous matrix,wh

1. A process, comprising: preventing the formation of a W/O inverse emulsion by injecting a water-based fluid into an oil well comprising an oil-based mud, thereby contacting the water-based fluid with the oil-based mud, which is present in the well as a residue or a filtrate from a porous matrix,wherein the water-based fluid, comprises water and: a non-ionic surfactant, which is stable in a temperature range from 10 to 90° C., has an HLB in a range from 8 to 20, and is soluble in water; anda salt,wherein the non-ionic surfactant comprises a C8 alkyl polyglucoside, a C10 alkyl polyglucoside, or a mixture thereof, andwherein the salt is present, and is present in an amount up to 60% by weight, based on a total weight of the fluid. 2. The process of claim 1, wherein the water-based fluid comprises 0.1 to 1% by weight of the non-ionic surfactant, based on a total weight of the water-based fluid. 3. The process of claim 1, wherein the oil-based mud comprises: (A) a paraffin oil, which acts as a dispersing phase; and(B1) a surfactant or (B2) a pair of surfactants, wherein the first surfactant of the pair acts as a primary emulsifier and the second surfactant of the pair acts as a secondary emulsifier. 4. The process of claim 3, wherein the paraffin oil is lamium. 5. The process of claim 3, wherein the oil-based mud comprises the pair of surfactants (B2), and a concentration of the primary emulsifier present in the oil-based mud is from 3-5% v/v and a concentration of the secondary emulsifier present in the oil-based mud is from 1-3% v/v. 6. The process of claim 1, wherein the water-based fluid comprises as the salt, based on a total weight of the fluid, from 1-35% by weight of CaCl2. 7. The process of claim 1, wherein the water-based fluid comprises as the salt, based on a total weight of the fluid, from 1-10% by weight of KCl. 8. The process of claim 1, wherein the water-based fluid comprises as the salt, based on a total weight of the fluid, from 40-60% by weight of CaBr2. 9. The process of claim 1, wherein the water-based fluid comprises only one non-ionic surfactant, which is a C8 alkyl polyglucoside. 10. The process of claim 1, wherein the water-based fluid comprises only one non-ionic surfactant, which is a C10 alkyl polyglucoside. 11. A process, comprising: resolving a W/O inverse emulsion by injecting a water-based fluid into an oil well, which was drilled with an oil-based mud and comprises a W/O inverse emulsion, thereby contacting the water-based fluid with the W/O inverse emulsion,wherein the water-based fluid, comprises water and: a non-ionic surfactant, which is stable in a temperature range from 10 to 90° C., has an HLB in a range from 8 to 20, and is soluble in water; anda salt,wherein the non-ionic surfactant comprises a C8 alkyl polyglucoside, a C10 alkyl polyglucoside, or a mixture thereof, andwherein the salt is present, and is present in an amount up to 60% by weight, based on a total weight of the fluid. 12. The process of claim 11, wherein the water-based fluid comprises 0.2 to 5% by weight of the non-ionic surfactant, based on a total weight of the water-based fluid. 13. The process of claim 11, wherein the oil-based mud comprises: (A) a paraffin oil, which acts as a dispersing phase; and(B1) a surfactant or (B2) a pair of surfactants, wherein the first surfactant of the pair acts as a primary emulsifier and the second surfactant of the pair acts as a secondary emulsifier. 14. The process of claim 13, wherein the paraffin oil is lamium. 15. The process of claim 13, wherein the oil-based mud comprises the pair of surfactants (B2), and a concentration of the primary emulsifier present in the oil-based mud is from 3-5% v/v and a concentration of the secondary emulsifier present in the oil-based mud is from 1-3% v/v. 16. The process of claim 11, wherein the water-based fluid comprises as the salt, based on a total weight of the fluid, from 1-35% by weight of CaCl2. 17. The process of claim 11, wherein the water-based fluid comprises as the salt, based on a total weight of the fluid, from 1-10% by weight of KCl. 18. The process of claim 11, wherein the water-based fluid comprises as the salt, based on a total weight of the fluid, from 40-60% by weight of CaBr2. 19. The process of claim 11, wherein the water-based fluid comprises only one non-ionic surfactant, which is a C8 alkyl polyglucoside. 20. The process of claim 11, wherein the water-based fluid comprises only one non-ionic surfactant, which is a C10 alkyl polyglucoside.