High density brines
AssigneeBaker Hughes, A Ge Company, LLC
InventorsMarshall Chiasson, James Allensworth, Moctesuma R. Trevino
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Abstract
A method of treating a wellbore comprises injecting into the wellbore a high density brine comprising water; an inorganic salt; and a polyol having at least four hydroxyl groups per molecule, the polyol being present in an amount effective to cause the high density brine to have a density of about 14.2 pounds per gallon to about 22 pounds per gallon; and to suppress the true crystallization point of the brine to about −70° F. to about 70° F. at a pressure of about 0 to about 20000 psi determined according to API 13J.
Claims21
A method of treating a wellbore, the method comprising injecting into the wellbore a high density brine comprising:
- water;
- an inorganic salt;
- and
- a polyol having at least four hydroxyl groups per molecule, the polyol being present in an amount effective to cause the high density to have a density of about 12.5 pounds per gallon to about 22 pounds per gallon;
- and to suppress the true crystallization point of the brine to about −70° C. to about 70° C. at a pressure of about 0 to about 20,000 psi determined according to API 13J.
A method of making a high density brine having a balanced density, true crystallization temperature, and rheology, the method comprising:
- preparing two or more brine samples having a target brine density from water, an inorganic salt, and a polyol having at least four hydroxyl groups per molecule, the two or more brine samples having increasing amounts of the polyol;
- measuring a rheological property and the true crystallization temperature at a predetermined pressure for each of the brine samples;
- establishing a correlation between the amount of the polyol with the measured rheological property and true crystallization temperature;
- selecting an amount of the polyol based on a target value of the rheological property and target true crystallization temperature;
- and
- preparing the high density brine having a balanced density, true crystallization temperature, and rheological property with water, the inorganic salt, and the selected amount of the polyol.
Dependencies are inferred from the claim text.