Drilling fluid with circulation loss reducing additive package

Abstract

A drilling fluid includes a base fluid and a circulation loss reducing additive package having a polysaccharide, a cellulose derivative and a pH controlling component.

What is claimed is:  
     
         1 . A drilling fluid, comprising: 
 a base fluid; and    a circulation loss reducing additive package comprising a polysaccharide, a cellulose derivative and a pH controlling component.    
     
     
         2 . The fluid of  claim 1 , wherein said polysaccharide is selected from the group consisting of non-ionic polysaccharides, low ionic charge polysaccharides, and combinations thereof.  
     
     
         3 . The fluid of  claim 1 , wherein said polysaccharide is selected from the group consisting of double helix compounds, triple helix compounds and combinations thereof.  
     
     
         4 . The fluid of  claim 1 , wherein said polysaccharide is scleroglucan.  
     
     
         5 . The fluid of  claim 1 , wherein said cellulose derivative is selected from the group consisting of hydroxypropyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, hydrophobically modified cellulose, and combinations thereof.  
     
     
         6 . The fluid of  claim 1 , wherein said cellulose derivative is hydroxyethyl cellulose.  
     
     
         7 . The fluid of  claim 1 , wherein said pH controlling additive is selected from the group consisting of monoethanolamine, ethanolamine, magnesium oxide, triethanolamine, sodium hydroxide, sodium carbonate, potassium carbonate and combinations thereof.  
     
     
         8 . The fluid of  claim 1 , wherein said additive package further comprises a starch component.  
     
     
         9 . The fluid of  claim 7 , wherein said starch component is selected from the group consisting of carboxymethyl starch, hydroxyethyl starch, hydroxypropyl starch, starches cross-linked with etherifying agents, starches cross-linked with esterifying agents and combinations thereof.  
     
     
         10 . The fluid of  claim 1 , wherein said additive package further comprises a bridging agent component.  
     
     
         11 . The fluid of  claim 10 , wherein said bridging agent component is calcium carbonate.  
     
     
         12 . The fluid of  claim 1 , wherein said additive package further comprises an antioxidant component.  
     
     
         13 . The fluid of  claim 12 , wherein said antioxidant component is selected from the group consisting sodium bisulfite, sodium sulfite and combinations thereof.  
     
     
         14 . The fluid of  claim 12 , wherein said antioxidant is sodium bisulfite.  
     
     
         15 . The fluid of  claim 1 , wherein said additive package further comprises a biocide component.  
     
     
         16 . The fluid of  claim 15 , wherein said biocide component is selected from the group consisting of isothiazolones, glutaraldehyde, quaternary amines and combinations thereof.  
     
     
         17 . A circulation loss reducing additive package, comprising a polysaccharide, a cellulose derivative and a pH controlling component.  
     
     
         18 . The circulation loss reducing additive package of  claim 17 , further comprising a starch, a bridging agent, antioxidant and a biocide.  
     
     
         19 . The circulation loss reducing additive package of  claim 18 , wherein said pH controlling additive is selected from the group consisting of monoethanolamine, ethanolamine, magnesium oxide, triethanolamine, sodium hydroxide, sodium carbonate, potassium carbonate and combinations thereof.  
     
     
         20 . The circulation loss reducing additive package of  claim 19 , wherein said starch component is selected from the group consisting of carboxymethyl starch, hydroxyethyl starch, hydroxypropyl starch, starches cross-linked with etherifying agents, starches cross-linked with esterifying agents and combinations thereof, wherein said bridging agent is calcium carbonate, wherein said antioxidant component is selected from the group consisting of sodium bisulfite, sodium sulfite and combinations thereof and wherein said biocide component is selected from the group consisting of isothiazolones, glutaraldehyde, quaternary amines and combinations thereof.