Abstract:
Methods and compositions relate to anode powders for use in batteries. The powders may provide limited surface area per volume of powder material. Further, the powders may include limited amounts of particles below a threshold size within a particle size distribution. Some embodiments utilize regular or anode grade petroleum coke as a precursor.
Abstract:
Cascade-type natural gas liquefaction methods and apparatus are provided, having enhanced thermodynamic efficiencies, through the use of added refrigeration levels in one or both of the ethylene and methane refrigeration systems thereof.
Abstract:
A flow improver comprising a plurality of core-shell particles that can be formed by emulsion polymerization. The core of the core-shell particles can include a drag reducing polymer, while the shell of the particles can include repeat units of a hydrophobic compound and an amphiphilic compound. The flow improver can demonstrate increased pumping stability over conventionally prepared latex flow improvers.
Abstract:
A method for removing organic sulfur compounds from a vent gas is described. Also described is an apparatus for absorbing organic sulfur compounds from vent gas.
Abstract:
A method and apparatus for geobaric analysis. The method may include acquiring an in situ gas volume of a subterranean formation, acquiring a drilling fluid characteristic, determining a volume of gas excavated from the subterranean formation utilizing the drilling fluid characteristic, and estimating the formation pressure utilizing the in situ gas volume and the excavated gas volume.
Abstract:
A composition and method for removing a filter cake from a horizontal wellbore in a subterranean formation using a composition containing a inorganic or organic acidic material, a cationic fluorocarbon surfactant, an alkyl alcohol, water optionally containing ammonium chloride and at least one of an alkyl polyglycoside and a betaine surfactant to produce a stable foam used to remove filter cake from a horizontal wellbore.
Abstract:
Methods for producing C10-C30 hydrocarbons from fatty materials, such as triglyceride compounds, are provided. Hydrocarbon compounds, particularly those boiling in the temperature range of between about 80° F. to about 1000° F., are produced by contacting a fatty material with at least one catalyst comprising cobalt and molybdenum on a zeolite support under hydrotreating conditions. Additional hydrotreating catalysts may also be used to further improve the properties of the hydrocarbon product.
Abstract:
This invention relates to a process for producing an improved cathode powder for making lithium ion batteries wherein the powder comprises lithium, vanadium and a polyanion. The process includes forming a solution-suspension of the precursors, which include vanadium pentoxide, with a reducing agent, a solvent, and a carbon-residue-forming material. The reducing agent causes the vanadium in vanadium pentoxide to reduce from V5+ to V3+. The solution-suspension is heated in an inert environment to drive the synthesis of the LVP (Li3V2(PO4)3) such that the carbon-residue-forming material is also oxidized to precipitate in and on the LVP forming carbon-containing LVP or CCLVP. The liquids are separated from the solids and the dry powder is heated to a second higher temperature to drive the crystallization of the product. The resulting product retains a small particle size, includes carbon in the LVP for conductivity and is created with very low cost precursors and avoids the need for milling or other processing to reduce the product to a particle size suitable for use in batteries. It also does not require the addition of carbon black, graphite or other form of carbon to provide the conductivity required for use in batteries.
Abstract:
An apparatus incorporating a chemical seal and method for removing fluids from a well is disclosed. The chemical seal is created by a foaming agent which, when in the presence of gas and fluids present in the well, and when agitated by the apparatus, creates foam between the apparatus and the walls of the well in which it operates. The foam improves the seal between the apparatus and the inner wall of the well, improving the efficiency of the apparatus in lifting fluids from the well. Furthermore, the chemical seal improves the distribution of treatment chemicals within the well as it reduces liquid flowback. Automatic recharging or reapplication of the foaming agent and/or treatment chemicals to the apparatus can be accomplished with a chemical application assembly associated with the well.
Abstract:
An anti-surge/reverse thrusting tool for reducing the forces on a drill bit used in subterranean well drilling operations is provided along with methods for drilling wells using a drill string employing the tool. The tool utilizes the pressure differential between drilling fluid flowing through the tool and the fluid located in the well bore annulus proximate the tool to reduce the likelihood of drill bit stall. The tool generally comprises an outer housing and a piston assembly that is axially shiftable relative to the housing.