Downhole servicing compositions having high thermal conductivities and methods of using the same

Abstract

A downhole servicing composition comprising from about 15 percent to about 80 percent by weight of a clay, and from about 10 percent to about 75 percent by weight of a carbon source is disclosed. The invention includes a downhole servicing composition comprising from about 15 percent to about 45 percent by weight of a first clay, from about 15 percent to about 45 percent by weight of a second clay, from about 10 percent to about 35 percent by weight of a filler, and from about 10 percent to about 75 percent by weight of a carbon source. The invention also includes a downhole servicing composition comprising an aqueous base and from about 10 percent to about 75 percent by weight of flaked graphite, wherein the downhole servicing composition has a thermal conductivity not less than about 0.8 BTU/hr-ft-° F.

1 . A downhole servicing composition comprising: from about 15 percent to about 80 percent by weight of a clay, and from about 10 percent to about 75 percent by weight of flaked graphite. 
     
     
         2 . The downhole servicing composition of  claim 1  wherein the clay is sodium bentonite, calcium bentonite, or combinations thereof. 
     
     
         3 . The downhole servicing composition of  claim 1  wherein the clay is sodium bentonite. 
     
     
         4 . The downhole servicing composition of  claim 1  further comprising from about 10 to about 35 percent by weight of filler selected from the group consisting of silica flour, silica fume, fly ash, pozzolan, sand, barite, zeolites, powdered glass, or combinations thereof. 
     
     
         5 . The downhole servicing composition of  claim 2  further comprising from about 10 to about 35 percent by weight of filler selected from the group consisting of silica flour, silica fume, sand, or combinations thereof. 
     
     
         6 . The downhole servicing composition of  claim 3  further comprising from about 10 to about 35 percent by weight of filler selected from the group consisting of silica flour, silica fume, sand, or combinations thereof. 
     
     
         7 . The downhole servicing composition of  claim 3  further comprising from about 10 to about 35 percent by weight silica flour as filler. 
     
     
         8 . The downhole servicing composition of  claim 1  further comprising: up to about 2 percent by weight of an alkaline earth metal oxide or an alkaline earth metal hydroxide selected from the group consisting of magnesium oxide, strontium oxide, calcium hydroxide, barium hydroxide, or combinations thereof. 
     
     
         9 . The downhole servicing composition of  claim 6  further comprising: up to about 2 percent by weight of magnesium oxide. 
     
     
         10 . The downhole servicing composition of  claim 1  further comprising: from about 2 percent to about 10 percent by weight of a dispersant selected from the group consisting of ammonium lignosulfonate salt, a metal lignosulfonate salt, a phosphate, a polyphosphate, an organophosphate, a phosphonate, a tannin, leonardite, a polyacrylate, or combinations thereof. 
     
     
         11 . The downhole servicing composition of  claim 6  further comprising: from about 2 percent to about 10 percent by weight of polyphosphate as a dispersant. 
     
     
         12 . The downhole servicing composition of  claim 9  further comprising: from about 2 percent to about 10 percent by weight of polyphosphate as a dispersant. 
     
     
         13 . The downhole servicing composition of  claim 1  further comprising water to form a slurry. 
     
     
         14 . The downhole servicing composition of  claim 1  wherein the downhole servicing composition has a thermal conductivity not less than about 0.8 BTU/hr-ft-° F. upon placement and setting in a wellbore. 
     
     
         15 . The downhole servicing composition of  claim 7 , further comprising water to form a slurry and wherein the dry components are present in an amount not exceeding about 50 percent by weight of the slurry. 
     
     
         16 . A downhole servicing composition comprising: an aqueous base and from about 10 percent to about 75 percent by weight of flaked graphite, wherein the downhole servicing composition has a thermal conductivity not less than about 0.8 BTU/hr-ft-° F. upon placement and setting in a wellbore. 
     
     
         17 . The downhole servicing composition of  claim 16  wherein the downhole servicing composition is substantially free of sand. 
     
     
         18 . The downhole servicing composition of  claim 16  wherein the downhole servicing composition has a hydraulic conductivity of from about 5×10 −9  cm/s to about 1×10 −7  cm/s. 
     
     
         19 . The downhole servicing composition of  claim 16  further comprising from about 10 to about 35 percent by weight of filler selected from the group consisting of silica flour, silica fume, or combinations thereof 
     
     
         20 . The downhole servicing composition of  claim 19  further comprising from about 15 percent to about 80 percent by weight of sodium bentonite. 
     
     
         21 . A downhole servicing composition comprising: from about 15 percent to about 80 percent by weight of sodium bentonite, and from about 10 percent to about 75 percent by weight of a carbon source selected from the group consisting of petroleum coke, pitch coke, tar coke, powdered carbon, flaked graphite, amorphous carbon, vein carbon, crystalline carbon, synthetic carbon, or combinations thereof. 
     
     
         22 . The downhole servicing composition of  claim 21  wherein the carbon source is flaked graphite and wherein the downhole servicing composition has a thermal conductivity not less than about 0.8 BTU/hr-ft-° F. upon placement and setting in a wellbore. 
     
     
         23 . The downhole servicing composition of  claim 22  further comprising from about 10 to about 35 percent by weight of filler selected from the group consisting of silica flour, silica fume, sand, or combinations thereof. 
     
     
         24 . A downhole servicing composition consisting essentially of:
 from about 15 percent to about 80 percent by weight of sodium bentonite;   from about 10 percent to about 75 percent by weight of flaked graphite;   from about 10 to about 35 percent by weight of filler selected from the group consisting of silica flour, silica fume, sand, or combinations thereof;   optionally up to about 2 percent by weight of magnesium oxide;   optionally from about 2 percent to about 10 percent by weight of polyphosphate as a dispersant; and   water to form a slurry.