Superior Graphite Company

Other

David J Derwin

Peter L Zaleski

Walter H Flood, Jr

Frank A Wawrzos

Changjun Zhou

Richard J Girkant

Igor V Barsukov

Donald J Weintritt

Peter Roy Carney

Craig Allen Baer

Maritza Gallego

George W Russell

Marcin Tlustochowicz

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.

Drilling fluid additive for loss circulation and wellbore strengthening

A method for improving the thermal characteristics of cement compositions is provided in which fine resilient graphitic carbon particles ('RGC') are substituted for a portion of the fine aggregate (typically sand) in the cement formulation. For the purposes of the present disclosure, 'fine' is intended to describe particulates having a mesh size of less than about 8 mesh, or a particle size of less than about 2.38 mm, or, more preferably when referring to RGC, a mesh size of less than about 16 mesh and a particle size of less than about 1.19 mm. &#x201c;Resilient&#x201d; is intended to describe graphitic carbon particles that exhibit a rebound of at least about 20% after compression to 10,000 psi.

Cement compositions including resilient graphitic carbon fraction

An electrically conductive paving system that has enhanced conductivity of the conductive graphite/asphalt layer. This is achieved by incorporating into the paving mixture a blend of two naturally occurring crystalline flake graphites, one being coarse (generally larger than 40 mesh/425 microns) and the other being fine (generally smaller than 100-200 mesh/150-75 microns). The ratio of course flake graphite to fine flake graphite may be from 1.5:1 and 1:1.5, but is preferably approximately 1:1.

Electrically conductive pavement mixture

An engineered carbonaceous material (ECM) comprising a mixture of synthetic graphite and one or more other graphite, such as natural flake graphite, natural vein graphite, and/or amorphous graphite. The objects are also achieved by an ECM comprising a mixture of expanded graphite and one or more other graphite materials, such as natural flake graphite, natural vein graphite, amorphous graphite and/or synthetic graphite. The ECM is preferably mixed with 0.01 to 20.0 wt. % MnO to create a battery active material. The mixtures may be made by either co-blending or co-grinding the graphites together. An electrochemical cell incorporating the material is also contemplated.

Engineered carbonaceous materials and power sources using these materials

A method for making expanded graphite from lamellar flake graphite comprising first providing lamellar flake graphite particles having at least a minimal purity, then intercalating the lamellar flake graphite particles with an expandable graphite intercalation compound, followed by expanding the graphite intercalation compound to exfoliate the flake graphite particles, and finally air milling the exfoliated flake graphite particles to further delaminate them.

Method for expanding lamellar forms of graphite and resultant product

A method of preventing or controlling the loss of well drilling fluid into the pores and fractures of subterranean rock formations by the addition of resilient graphitic carbon particles to the drilling fluid in sufficient amounts to plug the pores and fractures. The graphitic carbon material reduces loss of circulation, lowers torque and drag, prevents casing wear while drilling, and provides a new method for the controlled release of graphite at extreme pressure. The material is non-toxic and imparts the well-known lubricating properties of graphite without contributing to surface sheen development under US EPA offshore cuttings discharge rules.

Drilling fluid loss prevention and lubrication additive

An electrically conductive paving mixture for use in a pavement system which prevents the accumulation of frozen precipitation on surfaces, for example, like that of an airport runway. The pavement system comprises a layer of electrically conductive paving mixture, a layer of insulative paving mixture, electrically resistive cables, an electrical power supply, sensors for measuring humidity and temperature, and a control and monitoring system. The electrically conductive paving mixture comprises a blend of naturally-occurring amorphous graphite and synthetic graphite/desulfurized petroleum coke. Preferably, the blend of naturally-occurring graphite to synthetic graphite/desulfurized produced coke is in the ratio of 2:1.

Growing community of inventors

Prospect Heights, IL, United States of America

David J Derwin