Wellbore treatment and completion fluids and methods of using the same

A method of reducing the fluid loss from a wellbore into a subterranean formation, said method comprising

• adding to the wellbore a homogeneous fluid control loss pill comprising:
• about 15 wt % to about 99 wt % of a polyol wherein the polyol comprises propylene glycol and/or ethylene glycol;
• and
• a weighting agent wherein the weighting agent comprises CaCl2, CaBr2 and/or an alkali metal salt;
• wherein the fluid loss control pill has a density of about 9 pounds per gallon to about 20 pounds per gallon;
• and,
• a viscosifier wherein the viscosifier comprises carboxymethyl hydroxypropyl guar;
• maintaining the fluid loss control pill in contact with the subterranean formation.

A fluid loss pill for reducing fluid loss from a wellbore, the fluid loss pill comprising:

• about 15 wt % to about 99 wt % of a polyol selected from the group consisting of glycerol, a glycol, a polyglycol, and mixtures thereof, wherein the polyol comprises propylene glycol or ethylene glycol;
• about 1 wt % to about 84 wt % of a weighting agent, wherein the weighting agent comprises CaCl2, CaBr2, or an alkali metal salt;
• and
• about 0.5 wt % to about 5 wt % of a viscosifier, wherein the viscosifier comprises carboxymethyl hydroxypropyl guar.

A composition comprising a well treatment fluid comprising:

• a polyol comprising propylene glycol or ethylene glycol;
• a polysaccharide comprising carboxymethyl hydroxypropyl guar;
• and
• a weighting agent comprising an alkali metal salt,
• wherein the fluid is homogeneous.

A composition comprising a well treatment fluid comprising:

• a polyol comprising propylene glycol or ethylene glycol;
• a polysaccharide comprising carboxymethyl hydroxypropyl guar;
• and
• a weighting agent comprising CaCl2 or CaBr2,
• wherein the fluid is homogeneous.

A well completion fluid comprising:

• about 15 wt % to about 99 wt % of polypropylene glycol and/or polyethylene glycol having a number average molecular weight of about 500 to about 7000,
• about 1 wt % to about 84 wt % of an alkali metal salt, and
• about 0.5 wt % to about 5 wt % of carboxymethyl hydroxypropyl guar, based upon the weight of the fluid,
• wherein the fluid is homogeneous, has a density of about 9.0 ppg to about 20 ppg and a viscosity of greater than 100 cp at about 300° F. at 511 sec−1.

A well completion fluid comprising:

• about 15 wt % to about 99 wt % of polypropylene glycol and/or polyethylene glycol having a number average molecular weight of about 500 to about 7000,
• about 1 wt % to about 84 wt % of an alkaline earth metal salt, and
• about 0.5 wt % to about 5 wt % of carboxymethyl hydroxypropyl guar, based upon the weight of the fluid,
• wherein the fluid is homogeneous, has a density of about 9.0 ppg to about 20 ppg and a viscosity of greater than 100 cp at about 300° F. at 511 sec−1.