FORMULATIONS AND USES OF DRILLING FLUIDS CONTAINING VISCOSIFIED PHOSPHATE BRINE
Viscosified phosphate brine base fluids are disclosed, where the fluids include a hydratable polymer, have a density at or above about 10 lb/gal and a viscosity of at least 5 cP. Method for making and using the viscosified phosphate brine base fluids are also disclosed, including using the fluid in drilling, completing, and/or fracturing of oil and/or gas wells.
1 . A composition for use in downhole operations comprising:
a phosphate brine having a density of greater than 10 pounds per gallon (ppg) and an effective amount of a viscosifying system including a hydratable polymer, where the effective amount is sufficient to produce a visocosified phosphate brine having a viscosity of at least 5 cP and where the brine is stable of temperatures up to 450° F.
2 . The composition of claim 1 , wherein the density is greater than or equal to 12 ppg.
3 . The composition of claim 1 , wherein the density is greater than or equal to 13 ppg.
4 . The composition of claim 1 , wherein the brine is stable of temperatures up to 500° F.
5 . The composition of claim 1 , wherein the brine is stable of temperatures up to 600° F.
6 . The composition of claim 1 , wherein the viscosity between about 5 cP and about 600 cP.
7 . The composition of claim 1 , wherein the viscosity between about 5 cP and about 500 cP.
8 . The composition of claim 1 , wherein viscosity between about 10 cP and about 100 cP.
9 . A method for completing or working over of a well comprising:
completing or reworking the well in the presence of a completion fluid composition including a phosphate brine having a density of greater than 10 pounds per gallon (ppg) and an effective amount of a viscosifying system including a hydratable polymer, where the effective amount is sufficient to produce a visocosified phosphate brine having a viscosity of at least 5 cP and where the brine is stable of temperatures up to 450° F.
10 . The method of claim 9 , wherein the density is greater than or equal to 12 ppg.
11 . The method of claim 9 , wherein the density is greater than or equal to 13 ppg.
12 . The method of claim 9 , wherein the brine is stable of temperatures up to 500° F.
13 . The method of claim 9 , wherein the brine is stable of temperatures up to 600° F.
14 . The method of claim 9 , wherein the viscosity between about 5 cP and about 600 cP.
15 . The method of claim 9 , wherein the viscosity between about 5 cP and about 500 cP.
16 . The method of claim 9 , wherein viscosity between about 10 cP and about 100 cP.
17 . A method for drilling a well comprising:
circulated a drilling composition including a phosphate brine, while drilling, where the composition has a density of greater than 10 pounds per gallon (ppg) and an effective amount of a viscosifying system including a hydratable polymer, where the effective amount is sufficient to produce a visocosified phosphate brine having a viscosity of at least 5 cP and where brine is stable of temperatures up to 450° F.
18 . The method of claim 17 , wherein the density is greater than or equal to 12 ppg.
19 . The method of claim 17 , wherein the density is greater than or equal to 13 ppg.
20 . The method of claim 17 , wherein the brine is stable of temperatures up to 500° F.
21 . The method of claim 17 , wherein the brine is stable of temperatures up to 600° F.
22 . The method of claim 17 , wherein the viscosity between about 5 cP and about 600 cP.
23 . The method of claim 17 , wherein the viscosity between about 5 cP and about 500 cP.
24 . The method of claim 17 , wherein viscosity between about 10 cP and about 100 cP.