Synthetic oil-water emulsion drill-in fluid cleanup methods

Details Synthetic oil-water emulsion drill-in fluid cleanup methods Synthetic oil-water emulsion drill-in fluid cleanup methods

1997-09-22

1999-06-08

Graysay, Tamara

Wells

Processes

Cleaning or unloading well

166291, 166307, 166311, 507927, 507933, 507939, 507261, 507266, E21B 4327, E21B 4328

Patent

active

059097744

ABSTRACT:
The present invention provides methods of cleaning up a producing interval of a well bore drilled using a synthetic oil-water emulsion drill-in fluid. The methods basically comprise contacting filter cake and drill-in fluid on the walls of the well bore with three treatment fluids in three stages, the first and second treatment fluids being comprised of water, a filter cake dissolving acid, a mutual solvent and an emulsion penetrating agent. The third treatment fluid is comprised of water, a filter cake dissolving acid and a water wetting surfactant.

REFERENCES:
patent: 3077454 (1963-02-01), Monroe et al.
patent: 4028268 (1977-06-01), Sullivan et al.
patent: 5008026 (1991-04-01), Gardner et al.
patent: 5189012 (1993-02-01), Patel et al.
patent: 5589442 (1996-12-01), Gee et al.

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