Oil-based drilling fluid
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United States of America Patent
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Mar 30, 1999
Grant Date -
N/A
app pub date -
Jun 23, 1997
filing date -
Aug 2, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of removing the filter cake formed from invert emulsion compositions including an oleaginous, a non-oleaginous and an acid sensitive surfactant in an oil and gas well are disclosed. The acid sensitive surfactant is selected so that the invert emulsion can be broken and residual filter cake solids made water-wet upon the addition of an acidic wash fluid to the well.
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