CLEAR, HIGH-DENSITY HEAVY BRINE-BASED FLUIDS FOR DOWNHOLE APPLICATIONS
Compositions, methods and systems including a clear heavy brine-based fluid having a solute of calcium nitrate tetrahydrate, sodium metatungstate, and any combination thereof; and an aqueous carrier fluid, wherein the clear heavy brine-based fluid has a density equal to or greater than about 1.5 g/mL, including in the range of about 1.5 g/mL to about 3 g/mL.
1 . A clear heavy brine-based fluid comprising:
a solute of calcium nitrate tetrahydrate or sodium metatungstate; and
an aqueous carrier fluid,
wherein the clear heavy brine-based fluid has a density in the range of about 1.5 g/mL to about 3 g/mL; and
wherein the solute is present in the clear heavy brine-based fluid in an amount of from about 136 wt. % to about 200 wt. % of the aqueous carrier fluid.
2 . (canceled)
3 . The clear heavy brine-based fluid of claim 1 , wherein the solute is calcium nitrate tetrahydrate.
4 . The clear heavy brine-based fluid of claim 3 , wherein the calcium nitrate tetrahydrate is present in the clear heavy brine-based fluid in an amount of from about 0.2 wt. % to about 200 wt. % of the aqueous carrier fluid.
5 . The clear heavy brine-based fluid of claim 1 , wherein the solute is sodium metatungstate.
6 . The clear heavy brine-based fluid of claim 5 , wherein the sodium metatungstate is present in the clear heavy solids-free brine-based in an amount of from about 0.2 wt. % to about 150 wt. % of the aqueous carrier fluid.
7 . The clear heavy brine-based fluid of claim 1 , wherein the aqueous carrier fluid is selected from the group consisting of freshwater, deionized water, brine, seawater, produced water, and any combination thereof.
8 . The clear heavy brine-based fluid of claim 1 , further comprising an additive selected from the group consisting of a buffering agent, a corrosion inhibitor, a counter ion, a secondary weighting agent, a chelate, a viscosifier, a surfactant, a ligand modifier, a stabilizer, and any combination thereof.
9 . A method comprising:
introducing a clear heavy brine-based fluid into a subterranean formation, the clear heavy brine-based comprising:
a solute of calcium nitrate tetrahydrate or sodium metatungstate; and
an aqueous carrier fluid,
wherein the clear heavy brine-based fluid has a density in the range of about 1.5 g/mL to about 3 g/mL and the solute is present in the clear heavy brine-based fluid in an amount of from about 136 wt. % to about 200 wt. % of the aqueous carrier fluid.
10 . The method of claim 9 , further comprising drilling a wellbore in the subterranean formation while introducing the clear heavy brine-based fluid as a primary well control fluid.
11 . The method of claim 9 , further comprising fracturing the subterranean formation while introducing the clear heavy brine-based fluid.
12 . (canceled)
13 . The method of claim 9 , wherein the solute is calcium nitrate tetrahydrate.
14 . (canceled)
15 . The method of claim 9 , wherein the solute is sodium metatungstate.
16 . The method of claim 15 , wherein the sodium metatungstate is present in the clear heavy brine-based fluid in an amount of from about 0.2 wt. % to about 150 wt. % of the aqueous carrier fluid.
17 . The method of claim 9 , wherein the aqueous carrier fluid is selected from the group consisting of freshwater, deionized water, brine, seawater, produced water, and any combination thereof.
18 . The method of claim 9 , wherein the clear heavy brine-based fluid further comprises an additive selected from the group consisting of a buffering agent, a corrosion inhibitor, a counter ion, a secondary weighting agent, a chelate, a viscosifier, a surfactant, a ligand modifier, a stabilizer, and any combination thereof.
19 . A system comprising:
a drill string extendable into a wellbore from a drilling platform and conveying a clear heavy brine-based fluid to a drill bit arranged at a distal end of the drill string, the clear heavy brine-based fluid comprising:
a solute of calcium nitrate tetrahydrate or sodium metatungstate; and
an aqueous carrier fluid,
wherein the clear heavy brine-based fluid has a density in the range of about 1.5 g/mL to about 3 g/mL and the solute is present in the clear heavy brine-based fluid in an amount of from about 136 wt. % to about 200 wt. % of the aqueous carrier fluid.
20 . (canceled)