Superior Graphite Company

Changjun Zhou

David J Derwin

Frank A Wawrzos

Richard D Nelson

Jess Maruri Garcia

Peter Roy Carney

James L Bruley

Craig Allen Baer

Marcin Tlustochowicz

A carbonaceous particulate material is provided that is characterized by having a reversible volumetric expansion/contraction in fluid media ('V') of greater than or equal to (&#x2267;)3% between 4,000 psi and 10,000 psi. The porous carbonaceous particulate material of the present disclosure is also characterized by having a true density, ('P'), of 1.2 g/cc&#x2266;P&#x2266;2.0 g/cc, when milled to &#x2212;200 mesh and has a dparticle size distribution of about 15 &#x3bc;m. This is the consequence of the instant material exhibiting a high level of closed porosity with very small pores, in contrast with prior art materials that would have a wider range pore sizes for the closed pores.

Compressible carbonaceous particulate material and method of making same

An assembly for the test chamber of a wellbore fluid testing apparatus for simulating fractures in a wellbore is provided comprising base plate of a first diameter having an aperture therethrough configured to be removably secured within the test chamber. A solid end plate of a second diameter smaller than the first diameter is provided that is removably secured to the base plate. One or more intermediate plates is provided that is located between the base plate and the end plate, each intermediate plate also having an aperture therethrough. At least one shim or spacer is provided to space the intermediate plates from any adjacent intermediate plate and/or to space the end plate from the adjacent intermediate plate. The spacer is configured to be removably secured to the assembly and to permit fluid flow in in the assembly through the aperture in the base plate and the opposed face of the intermediate plate and an adjacent intermediate plate or the base plate.

Wellbore fluid testing assembly

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.

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Chicago, IL, United States of America

Changjun Zhou