Synthetic oil-water emulsion drill-in fluid cleanup methods
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United States of America Patent
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Jun 8, 1999
Grant Date -
N/A
app pub date -
Sep 22, 1997
filing date -
Sep 22, 1997
priority date (Note) -
Expired
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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.
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