Well completion and workover fluid

Claim 2

AN AQUEOUS WELL COMPLETION AND WORKOVER FLUID COMPRISING A DISPERSION OF ABOUT 4 TO 10 POUNDS PER BARREL OF FINELY DIVIDED, OIL-SOLUBLE, WATER-INSOLUBLE SOLID PARTICLES IN AN AQUEOUS SALT SOLUTION CONTAINING ABOUT 1 TO 5 POUNDS PER BARREL OF CHROME LIGNITE, ABOUT 0.1 TO 2 POUNDS PER BARREL OF XANTHAN GUM, ABOUT 0.1 TO 1 POUND PER BARREL OF HYDROXYETHYL CELLULOSE, AND AT LEAST ABOUT 1 WEIGHT PERCENT OF WATER-SOLUBLE INORGANIC ALKALI METAL OR AMMONIUM SALT, SAID PARTICLES COMPRISING A HOMOGENEOUS SOLID SOLUTION OF (1) WAX, (2) AN OILSOLUBLE SURFACE ACTIVE GLYCERLY OR SORBITAN PARTIAL ESTER OF A SATURATED HIGHER FATTY ACID, (3) A WATER-DISPERSIBLE SURFACE ACTIVE POLYETHYLENE GLYCOL MONOESTER OF A SATURATED HIGHER FATTY ACID, (4) AN ETHYLENE/VINYL ACETATE COPOLYMER, AND (5) A FATTY ALCOHOL.

Claim 3

The composition defined in claim 1 wherein said finely divided, oil-soluble, water-insoluble particles have average diameters within the range of about 0.1 to 50 microns.

Claim 4

The composition defined in claim 1 wherein said hydroxyethyl cellulose contains about 1 to 3 moles of substituent ethylene oxide for each anhydroglucose unit of the cellulose and is characterized by a Brookfield viscosity of about 1,500 to 5,000 centipoises at 25* C. for a 1 weight percent aqueous solution thereof.

Claim 5

The composition defined in claim 1 wherein said water-soluble, inorganic alkali metal or ammoNium salt is an alkali metal or ammonium chloride.

Claim 6

The composition defined in claim 1 wherein said ethylene/vinyl acetate copolymer contains about 10 to 30 weight percent of vinyl acetate and exhibits a Melt Index of less than about 20 grams/10 minutes.

Claim 7

The composition defined in claim 1 wherein said fatty alcohol is a saturated fatty alcohol containing between about 10 and 14 carbon atoms.

Claim 8

AN AQUEOUS WELL COMPLETION AND WORKOVER FLUID COMPRISING A DISPERSION OF ABOUT 4 TO 10 POUNDS PER BARREL OF FINELY DIVIDED, OIL-SOLUBLE, WATER-INSOLUBLE SOLID PARTICLES IN A AQUEOUS SALT SOLUTION CONTAINING ABOUT 1 TO 5 POUNDS PER BARREL OF CHROME LIGNITE, ABOUT 0.1 TO 2 POUNDS PER BARREL OF XANTHAN GUM; ABOUT 0.1 TO 1 POUND PER BARREL OF A HYDROXYETHYL CELLULOSE HAVING ABOUT 1 TO 3 MOLES OF SUBSTITUENT ETHYLENE OXIDE PER ANHYDROGLUCOSE UNIT OF THE CELLULOSE AND THAT IS CHARACTERIZED BY A VISCOSITY OF ABOUT 1,500 TO 5,000 CENTIPOISES FOR A 1 WEIGHT PERCENT SOLUTION THEREOF; AND AT LEAST ABOUT 1 WEIGHT PERCENT OF AN ALKALI METAL OR AMMONIUM HALIDE OR NITRATE; AND PARTICLES COMPRISING A HOMOGENEOUS SOLID SOLUTION OF (1) ABOUT 45 TO 55 WEIGHT PERCENT OF PARAFFIN WAX, (2) ABOUT 15 TO 20 WEIGHT PERCENT OF GLYCERYL OR SORBITAN MONOSTEARATE, (3) ABOUT 25 TO 30 WEIGHT PERCENT OF POLYETHYLENE GLYCOL MONOSTEARATE, (4) ABOUT 1 TO 4 WEIGHT PERCENT OF AN ETHYLENE/VINYL ACETATE COPOLYMER CONTAINING ABOUT 10 TO 30 WEIGHT PERCENT VINYL ACETATE AND EXHIBITING A MELT INDEX OF LESS THAN 20 GRAMS/10 MINUTES, AND (5) A SATURATED FATTY ALCOHOL CONTAINING ABOUT 10 TO 14 CARBON ATOMS, SAID PARTICLES HAVING AVERAGE DIAMETERS IN THE RANGE OF ABOUT 0.1 TO 50 MICRONS.

Claim 9

AN AQUEOUS WELL COMPLETION AND WORKOVER FLUID COMPRISING A DISPERSION OF ABOUT 4 TO 10 POUNDS PER BARREL OF FINELY DIVIDED, OIL-SOLUBLE, WATER-INSOLUBLE SOLID PARTICLES IN A AQUEOUS SALT SOLUTION CONTAINING ABOUT 1 TO 5 POUNDS PER BARREL OF CHROME LIGNITE, ABOUT 0.1 TO 2 POUNDS PER BARREL OF XANTHAN GUM; ABOUT 0.1 TO 1 POUND PER BARREL OF A HYDROXYETHYL CELLULOSE HAVING ABOUT 1 TO 3 MOLES OF SUBSTITUENT ETHYLENE OXIDE PER ANHYDROGLUCOSE UNIT OF THE CELLULOSE AND THAT IS CHARACTERIZED BY A VISCOSITY OF ABOUT 1,500 TO 5,000 CENTIPOISES FOR A 1 WEIGHT PERCENT SOLUTION THEREOF; AND AT LEAST ABOUT 1 WEIGHT PERCENT OF AN ALKALI METAL OR AMMONIUM HALIDE OR NITRATE; AND PARTICLES COMPRISING A HOMOGENEOUS SOLID SOLUTION OF (1) ABOUT 45 TO 55 WEIGHT PERCENT OF PARAFFIN WAX, (2) ABOUT 15 TO 20 WEIGHT PERCENT OF GLYCERYL OR SORBITAN MONOSTEARATE, (3) ABOUT 25 TO 30 WEIGHT PERCENT OF POLYETHYLENE GLYCOL MONOSTEARATE, (4) ABOUT 1 TO 4 WEIGHT PERCENT OF AN ETHYLENE/VINYL ACETATE COPOLYMER CONTAINING ABOUT 10 TO 30 WEIGHT PERCENT VINYL ACETATE AND EXHIBITING A MELT INDEX OF LESS THAN 20 GRAMS/10 MINUTES, AND (5) A SATURATED FATTY ALCOHOL CONTAINING ABOUT 10 TO 14 CARBON ATOMS, SAID PARTICLES HAVING AVERAGE DIAMETERS IN THE RANGE OF ABOUT 0.1 TO 50 MICRONS.

Claim 10

An aqueous well completion and workover fluid comprising a dispersion of about 5 to 9 pounds per barrel of finely divided, oil-soluble, water-insoluble solid particles in an aqueous salt solution containing about 2 to 4 pounds per barrel of chrome lignite; about 0.5 to 1.5 pounds per barrel of xanythan gum; about 0.1 to 1 pound per barrel of a hydroxyethyl cellulose having about 2.5 moles of substituent ethylene oxide per anhydroglucose unit of the cellulose and that is characterized by a viscosity of about l,500 to 2,500 centipoises at 25* C. for a concentration of 1 percent thereof; and at least about 1 weight percent of potassium chloride; said particles comprising a homogeneous solid solution of (1) about 45 to 55 weight percent of a paraffin wax having a melting point of about 165* F., (2) about 15 to 20 weight percent of glyceryl or sorbitan monostearate, (3) about 25 to 30 weight percent of polyethylene glycol 6000 monostearate, (4) about 2 weight percent of an ethylene/vinyl acetate copolymer containing about 17 to 19 weight percent of vinyl acetate and exhibiting a Melt Index of 2 to 3 grams/10 minutes, and (5) about 1.5 to 2.5 weight percent of lauryl alcohol, said particles having average diameters in the range of about 0.1 to 50 microns.

Claim 11

An aqueous well completion and workover fluid comprising a dispersion of about 5 to 9 pounds per barrel of finely divided, oil-soluble, water-insoluble solid particles in an aqueous salt solution containing about 2 to 4 pounds per barrel of chrome lignite; about 0.5 to 1.5 pounds per barrel of xanythan gum; about 0.1 to 1 pound per barrel of a hydroxyethyl cellulose having about 2.5 moles of substituent ethylene oxide per anhydroglucose unit of the cellulose and that is characterized by a viscosity of about l,500 to 2,500 centipoises at 25* C. for a concentration of 1 percent thereof; and at least about 1 weight percent of potassium chloride; said particles comprising a homogeneous solid solution of (1) about 45 to 55 weight percent of a paraffin wax having a melting point of about 165* F., (2) about 15 to 20 weight percent of glyceryl or sorbitan monostearate, (3) about 25 to 30 weight percent of polyethylene glycol 6000 monostearate, (4) about 2 weight percent of an ethylene/vinyl acetate copolymer containing about 17 to 19 weight percent of vinyl acetate and exhibiting a Melt Index of 2 to 3 grams/10 minutes, and (5) about 1.5 to 2.5 weight percent of lauryl alcohol, said particles having average diameters in the range of about 0.1 to 50 microns.