Drilling fluid additive for loss circulation and wellbore strengthening
AssigneeSuperior Graphite Co.
InventorsChangjun Zhou, David J. Derwin, Frank A. Wawrzos
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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.
Claims1
A method for controlling the loss of drilling fluid from an oil well borehole into formations penetrated by a drill bit comprising adding to the drilling fluid resilient graphitic carbon particles wherein the particles have 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.
Dependencies are inferred from the claim text.