Modified acid compositions as alternatives to conventional acids in the oil and gas industry
AssigneeDorf Ketal Chemicals Fze
InventorsClay Purdy, Markus Weissenberger
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Abstract
An aqueous modified acid composition for use in oil industry activities, said composition comprising: an amino acid, an alkanolamine and strong acid wherein the mineral acid: alkanolamine/amino acid are present in a molar ratio of not more than 15:1, preferably not more than 10:1; it can also further comprise a metal iodide or iodate. Said composition demonstrates advantages over known conventional acids and modified acids.
Claims20
An aqueous modified acid composition comprising:
- HCl;
- an amino acid;
- and
- an alkanolamine;
- wherein the mineral acid:
- alkanolamine/amino acid are present in a molar ratio of not more than 15:1;
- wherein the amino acid is selected from the group consisting of:
- lysine, glycine, valine, arginine, histidine, methionine and combinations thereof;
- and
- wherein the aqueous modified acid composition has a pH of less than 1.
The use of an aqueous modified acid composition in an oil industry activity, said composition comprising:
- HCl;
- an amino acid;
- and
- an alkanolamine;
- wherein the HCl:
- alkanolamine/amino acid are present in a molar ratio of not more than 15:1,
- wherein the amino acid is selected from the group consisting of:
- lysine, glycine, valine, arginine, histidine, methionine and combinations thereof;
- wherein the aqueous modified acid composition has a pH of less than 1;
- and
- wherein the use comprises an activity selected from the group consisting of:
- stimulate formations;
- assist in reducing breakdown pressures during downhole pumping operations;
- treat wellbore filter cake post drilling operations;
- assist in freeing stuck pipe;
- descale pipelines and/or production wells;
- increase injectivity of injection wells;
- lower the pH of a fluid;
- remove undesirable scale on a surface selected from the group consisting of:
- equipment, wells and related equipment and facilities;
- fracture wells;
- complete matrix stimulations;
- conduct annular and bullhead squeezes & soaks;
- pickle tubing, pipe and/or coiled tubing;
- increase effective permeability of formations;
- reduce or remove wellbore damage;
- clean perforations;
- and solubilize limestone, dolomite, calcite and combinations thereof.
A method of treating a metal surface with a composition comprising:
- HCl;
- an amino acid;
- and
- an alkanolamine;
- wherein the HCl:
- alkanolamine/amino acid are present in a molar ratio of not more than 15:1,
- wherein the amino acid is selected from the group consisting of:
- lysine, glycine, valine, arginine, histidine, methionine and combinations thereof;
- wherein the composition has a pH of less than 1;
- said method comprising the steps of:
- providing said composition;
- exposing said metal surface to said composition;
- allowing said composition a sufficient period of time to act upon said surface;
- and
- optionally, removing the acid composition when the exposure time has been determined to be sufficient for the operation to be complete or sufficiently complete.
Dependencies are inferred from the claim text.