Drilling fluid additive for loss circulation and wellbore strengthening
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United States of America Patent
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Apr 7, 2015
Grant Date -
Sep 18, 2014
app pub date -
Mar 15, 2013
filing date -
Mar 15, 2013
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Abstract
A method for controlling the loss of drilling fluid from an oil well borehole into formations penetrated by a drill bit is disclosed by which resilient graphitic carbon particles having a resiliency greater than about 130% rebound after compression to 10,000 psi; a degree of graphitization greater than 85%, as measured by d002 using XRD; an average pore size larger than 0.035 micron; and an aspect ratio smaller than 0.63 are added to the drilling fluid.
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