Method for simultaneous removal of asphaltine, and/or paraffin and scale from producing oil wells
OwnerRichard Dyerinventor
Life of this patent
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Abstract
A method for cleaning oil wells to increase the flow of oil thereof by use of a unique aqueous cleaning emulsion comprising of water, hydrocarbon solvent, detergent and mineral acid. This one step method provides for the simultaneously cleaning/removal of asphaltine and/or paraffin and scale. This method can be used alone or with the assistance of a wash tool which is a combination pressure and surge wash tool having a nipple assembly. A by-pass port is coupled to the nipple assembly and a diverter cup is coupled to the by-pass port. A plurality of pressure wash cups are positioned on the tool. A pressure wash port is located between the plurality of pressure wash cups and a pump shoe assembly is coupled to a bottom pressure wash cup.
Claims32
A one step process for removing both asphaltines and/or paraffins and scale simultaneously from an oil well containing clogged perforations or openings comprising the steps of:
- a. Preparing an aqueous cleaning emulsion comprising:
- i) from about 50% to about 98% by weight, water;
- ii) from about 0.1% to about 15% by weight, detergent;
- iii) from about 0.1% to about 20.0% by weight, hydrocarbon solvent;
- and
- iv) from about 0.1% to about 15.0% by weight, mineral acid, with the proviso that said emulsion is in a stable state over a wide range of temperatures and that the four materials, (i)-(iv) are in solution.
- b. Contacting said emulsion with the interior of the oil well for a period of time sufficient to dispense asphaltines, paraffins and scale within the well from said openings.
A method of cleaning an oil well containing asphaltine and/or paraffin and scale to increase oil flow therefrom comprising the steps of:
- a. adding an aqueous cleaning emulsion comprising water, a detergent, a hydrocarbon solvent, and a mineral acid into the oil well containing a tubing string;
- b. coupling a surge and pressure wash tool to said tubing string of the oil well;
- c. moving the surge and pressure tool to the bottom of said oil well;
- and
- d. raising the surge and pressure wash tool after a reasonable period of time, thereby providing a period of contact under pressure and vacuum of said emulsion with said asphaltine, paraffin and scale.
An aqueous cleaning emulsion useful to remove asphaltine and/or paraffin and scale simultaneously from oil wells comprising:
- i) from about 50% to about 98% by weight, water;
- ii) from about 0.1% to about 15% by weight, detergent;
- iii) from about 0.1% to about 20.0% by weight, hydrocarbon solvent;
- and
- iv) from about 0.1% to about 15.0% by weight, mineral acid, with the proviso that said emulsion is in a stable state over a wide range of temperatures and that the four materials, (i)-(iv) are in solution.
A combination surge and pressure wash tool for cleaning wells comprising, in combination:
- a. a nipple assembly
- b. a by-pass port coupled to the nipple assembly;
- c. a diverter cup coupled to the by-pass port;
- d. a plurality of pressure wash cups positioned on the tool;
- e. a pressure wash port located between the plurality of pressure wash cups;
- and
- f. A pump shoe assembly coupled to a bottom pressure wash cup.
Dependencies are inferred from the claim text.