Scale treatment in geothermal or extremely high temperature wells
AssigneeHalliburton Energy Services, Inc.
InventorsKristina Henkel Holan, Enrique Antonio Reyes
Life of this patent
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Abstract
Disclosed herein are methods and systems for treating geothermal wells. The methods include introducing a treatment fluid into a wellbore of a geothermal well having geothermal scale, contacting the geothermal scale with the treatment fluid, and removing at least a portion of the geothermal scale from the geothermal well using the treatment fluid. The treatment fluid comprises an ester, a fluoride-containing source, and a base fluid, wherein a molar ratio of fluoride-containing source to ester is about 1:1 to about 5:1. The methods may also be applied to matrix acidizing.
Claims16
A method for treating geothermal wells comprising:
- introducing a treatment fluid into a wellbore of a geothermal well having geothermal scale,
- wherein the treatment fluid comprises an ester, a fluoride-containing source, and a base fluid, wherein a molar ratio of fluoride-containing source to ester is about 1:1 to about 5:1, wherein the ester comprises methyl lactate, and wherein the fluoride-containing source comprises hydrofluoric acid;
- contacting the geothermal scale with the treatment fluid;
- and
- removing at least a portion of the geothermal scale from the geothermal well using the treatment fluid.
A method for treating geothermal wells comprising:
- introducing a treatment fluid into a wellbore of a geothermal well,
- wherein the treatment fluid comprises an ester, wherein the ester comprises methyl lactate a fluoride-containing source, wherein the fluoride-containing source comprises hydrofluoric acid, and a base fluid, wherein a molar ratio of fluoride-containing source to ester is about 1:1 to about 5:1, and
- wherein the geothermal well has geothermal scale and a bottomhole temperature from about 350° F. to about 600° F.;
- contacting the geothermal scale with the treatment fluid;
- removing at least a portion of the geothermal scale from the geothermal well using the treatment fluid;
- mixing a corrosion inhibitor to the treatment fluid at surface;
- and
- pumping the treatment fluid comprising a corrosion inhibitor downhole.
A method of matrix acidizing comprising:
- introducing a treatment fluid into a wellbore of a formation,
- wherein the treatment fluid comprises an ester, a fluoride-containing source, at least one corrosion inhibitor comprising crotonaldehyde and its Mannich bases, and a base fluid, wherein a molar ratio of fluoride-containing source to ester is about 1:1 to about 5:1;
- contacting the formation with the treatment fluid;
- and
- improving a permeability of the formation using the treatment fluid.
Dependencies are inferred from the claim text.