Method for simultaneous removal of asphaltene and/or paraffin and scale from producing oil wells
OwnerRichard J. 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, and detergent. This one step method provides for the simultaneously cleaning/removal of asphaltene 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.
Claims14
A one step process for removing both asphaltenes 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 consisting essentially of:
- i) from about 50% a to about 98% by weight, water;
- ii) from about 0.1% to about 15% by weight, detergent;
- and
- iii) from about 0.1% to about 20.0% by weight, hydrocarbon solvent;
- with the proviso that said emulsion is in a stable state over a wide range of temperatures and that the three materials, (i)-(iii) are in solution;
- b. contacting said emulsion with the interior of the oil well for a period of time sufficient to dispense asphaltenes, paraffins and scale within the well from said openings.
A method of cleaning an oil well containing asphaltene and/or paraffin and scale to increase oil flow therefrom comprising the steps of:
- a. adding an aqueous cleaning emulsion consisting essentially of water, a detergent, and a hydrocarbon solvent 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 asphaltene, paraffin and scale.
Dependencies are inferred from the claim text.