Composition and process for well cleaning
AssigneeCESI Chemical, a Flotek Company
InventorsJohn T. Pursley, David L. Holcomb, Glenn S. Penny
Life of this patent
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Abstract
Disclosed is a microemulsion well treatment microemulsion that is formed by combining a solvent-surfactant blend with a carrier fluid. In preferred embodiments, the solvent-surfactant blend includes a surfactant and a solvent selected from the group consisting of terpenes and alkyl or aryl esters of short chain alcohols. The disclosed well treatment microemulsion can be used in well remediation, stimulation and hydrogen sulfide mitigation operations. Additionally, the well treatment microemulsion can be used in the production of benzothiophenes through interaction with hydrogen sulfide.
Claims56
A well treatment microemulsion comprising:
- a solvent-surfactant blend, wherein the solvent-surfactant blend comprises:
- a solvent selected from the group consisting of terpenes and alkyl or aryl esters of short chain alcohols;
- and
- a surfactant;
- a carrier fluid;
- and
- wherein the solvent-surfactant blend is combined with the carrier fluid to produce the well treatment microemulsion.
A method for treating an oil or gas well having a wellbore, comprising:
- forming a solvent-surfactant blend;
- preparing a microemulsion by combining the solvent-surfactant blend with a carrier fluid;
- and
- injecting the microemulsion into the oil or gas well.
A method for the treatment of hydrogen sulfide;
- comprising:
- forming a solvent-surfactant blend;
- preparing a microemulsion by combining the solvent-surfactant blend with a carrier fluid;
- and
- contacting the hydrogen sulfide with the microemulsion.
A method for the production of benzothiophenes, comprising:
- forming a solvent-surfactant blend;
- preparing a microemulsion by combining the solvent-surfactant blend with a carrier fluid;
- and
- contacting the hydrogen sulfide with the microemulsion to produce benzothiophenes.
A method of treating an oil or gas well with a well treatment microemulsion, wherein the oil or gas well has a wellbore that contains water-based fluid, the method comprising:
- forming a solvent-surfactant blend by combining a solvent with an oil-in-water based surfactant mixture that includes a surfactant having a hydrophile-lipophile value of about 8 to 18;
- and
- injecting the solvent-surfactant blend into the wellbore, wherein the solvent-surfactant blend mixes with the water-based fluid to form a well treatment microemulsion.
Dependencies are inferred from the claim text.