Fluids and methods for mitigating sag and extending emulsion stability
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United States of America Patent
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Jan 17, 2023
Grant Date -
Aug 30, 2018
app pub date -
Feb 26, 2018
filing date -
Feb 26, 2017
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Abstract
A method of drilling a wellbore includes pumping an oleaginous wellbore fluid into a wellbore, the oleaginous wellbore fluid including an oleaginous continuous phase; a non-oleaginous discontinuous phase; an emulsifier stabilizing the non-oleaginous discontinuous phase in the oleaginous continuous phase; an organophilic clay; a weighting agent; and a wetting agent having an HLB ranging from about 4 to 10.5 that it selected such that the oleaginous wellbore fluid has a 600 rpm dial value at 40° F. of less than about 300 and a 10 minute gel strength of less than about 40 lbf/100 ft2.
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