Method and composition to reduce filters loss of fluids employed in wells

Claim 2

A FLUID TO BE EMPLOYED IN A WELL, SAID FLUID CONTIANING SAID CONSTITUENTS AND HAVING A CONTINUOUS AQUEOUS PHASE, SAID CONTINUOUS AQUEOUS PHASE CONTAINING IN AN AMOUNT SUFFICIENT TO REDUCE THE FILTER LOSS THEREOF A COMPOUND SELECTED FROM THE GROUP CONSISTINGOF SULFONATED POLY (2,6-DIMETHYLPHENOL) AND THE ALKAI METAL, ALKALINE EARTH METAL, AND AMMONIUM, SALTS THEREOF AND HAVING A MOLECULAR WIEGHT OF AT LEAST 5,000.

Claim 3

IN A PROCESS FOR DRILLING A WELL IN THE EARTH WHEREIN A DRILLING FLUID CONTAINING SOLID CONSTITUENTS AND A CONTINUOUS AQUEOUS PHASE IS CIRCUALATED THROUGH SAID WELL DURING SAID DRILLING, THE STEPS COMPRISING ADDING TO SAID DRILLING FLUID A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULFONATED POLY (2,6-DIMETHYLPHENOL) AND THE ALKALI METAL, ALKALINE EARTH METAL, AND AMMONIUM SALTS THEREOF, SAID COMPOUND HAVING A MOLEUCLAR WEIGHT OF AT LEAST 5,000 IN AN AMOUNT SUFFICIENT TO REDUCE THE FILTER LOSS OF SAID DRIDLLING FLUID BUT INSUFFICIENT TO INCREASE THE VISCOSITY OF SAID DRILLING FLUID TO SUCH AN EXTENT THAT IT CANNOT BE CIRCULATED, AND CIRCULATING SAID DRILLING FLUID IN SAID WELL.

Claim 4

IN A PROCESS FOR DRILLING A WELL IN THE EARTH WHEREIN A DRILLING FLUID CONTAINING SOLID CONSTITUENTS AND A CONTINUOUS AQUEOUS PHASE IS CIRCUALATED THROUGH SAID WELL DURING SAID DRILLING, THE STEPS COMPRISING ADDING TO SAID DRILLING FLUID A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULFONATED POLY (2,6-DIMETHYLPHENOL) AND THE ALKALI METAL, ALKALINE EARTH METAL, AND AMMONIUM SALTS THEREOF, SAID COMPOUND HAVING A MOLEUCLAR WEIGHT OF AT LEAST 5,000 IN AN AMOUNT SUFFICIENT TO REDUCE THE FILTER LOSS OF SAID DRIDLLING FLUID BUT INSUFFICIENT TO INCREASE THE VISCOSITY OF SAID DRILLING FLUID TO SUCH AN EXTENT THAT IT CANNOT BE CIRCULATED, AND CIRCULATING SAID DRILLING FLUID IN SAID WELL.

Claim 5

IN A PROCESS FOR CEMENTING A WELL IN THE EARTH WHEREIN A CEMENT COMPOSITION CONTAINING SOILD CONSTITUENTS COMPRISING HYDRAULIC CEMENT AND HAVING A CONTINUOUS AQUEOUS PHASE IS PLACED IN SAID WELL, THE STEPS COMPRISING ADDING TO SAID CEMENT COMPOSTIONK A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULFONATED POLY (2,6-DIMETHYLPHENOL) AND THE ALKALI METAL, ALKALINE EARTH METAL, AND AMMONIUM SALTS THEREOF, SAID COMPOUND HAVING A MOLECULAR WEIGHT OF AT LEAST 5,000 AND IN AN AMOUNT SUFFICIENT TO REDUCE THE FILTER LOSS OF SAID CEMENT COMPOSITION, AND PLACING SAID CEMENT COMPOSITION IN SAID WELL.

Claim 6

IN A PROCESS FOR CEMENTING A WELL IN THE EARTH WHEREIN A CEMENT COMPOSITION CONTAINING SOILD CONSTITUENTS COMPRISING HYDRAULIC CEMENT AND HAVING A CONTINUOUS AQUEOUS PHASE IS PLACED IN SAID WELL, THE STEPS COMPRISING ADDING TO SAID CEMENT COMPOSTIONK A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULFONATED POLY (2,6-DIMETHYLPHENOL) AND THE ALKALI METAL, ALKALINE EARTH METAL, AND AMMONIUM SALTS THEREOF, SAID COMPOUND HAVING A MOLECULAR WEIGHT OF AT LEAST 5,000 AND IN AN AMOUNT SUFFICIENT TO REDUCE THE FILTER LOSS OF SAID CEMENT COMPOSITION, AND PLACING SAID CEMENT COMPOSITION IN SAID WELL.