Abstract: An improved resin coated particle comprises a particulate substrate, an inner coating of a curable resin and an outer coating of a substantially cured resin. These improved resin coated particles are produced by first coating the substrate with a reactive resin. A second or outer coating of a resin is then coated over the inner curable resin coating and subjected to conditions of time and temperature sufficient to substantially cure said outer coating while the inner coating remains curable. The particles can be used in a method for treating subterranean formations, which comprises placing in or adjacent to the formation a quantity of the resin coated particle and allowing them to cure into a high strength permeable mass in the formation.

Abstract: An improved resin coated particle comprises a particulate substrate, an inner coating of a curable resin and an outer coating of a substantially cured resin. These improved resin coated particles are produced by first coating the substrate with a reactive resin. A second or outer coating of a resin is then coated over the inner curable resin coating and subjected to conditions of time and temperature sufficient to substantially cure said outer coating while the inner coating remains curable. The particles can be used in a method for treating subterranean formations, which comprises placing in or adjacent to the formation a quantity of the resin coated particle and allowing them to cure into a high strength permeable mass in the formation.

Abstract: An improved resin coated particle comprises a particulate substrate, an inner coating of a curable resin and an outer coating of a substantially cured resin. These improved resin coated particles are produced by first coating the substrate with a reactive resin. A second or outer coating of a resin is then coated over the inner curable resin coating and subjected to conditions of time and temperature sufficient to substantially cure said outer coating while the inner coating remains curable. The particles can be used in a method for treating subterranean formations, which comprises placing in or adjacent to the formation a quantity of the resin coated particle and allowing them to cure into a high strength permeable mass in the formation.

Abstract: A high strength particle comprised of a particulate substrate, a substantially cured inner resin coating, an outer resin coating, and a reinforcing agent interspersed at the inner coating/outer coating boundary, which is used in the propping of a fracture in a subterranean formation.

Abstract: A high strength particle comprised of a particulate substrate, a substantially cured inner resin coating, an outer resin coating, and a reinforcing agent interspersed at the inner coating/outer coating boundary.

Abstract: A biodegradable, biocompatible, resorbable infusion stent comprising a terpolymer of:(a) L(-)lactide,(b) glycolide, and(c) epsilon-caprolactone.This invention includes a method for treating ureteral obstructions or impairments by utilizing a biodegradable, biocompatible, resorbable infusion stent, and a method for controlling the speed of resorption of the stent.

Abstract: A high strength self-consolidating particle comprised of a particulate substrate, a substantially cured inner resin coating and a fusible curable outer resin coating.

Abstract: An improved particulate material for use in treating subterranean formations as a proppant and/or as a fluid loss agent in hydraulic fracturing and as a screening material in gravel packing comprised of heat curable particles capable of forming a cohesive mass, said particles comprised of a high strength center, a coupling agent chemically bound to the center with a heat curable resin coated over the center.

Abstract: A high strength self-consolidating particle comprised of a particulate substrate, a substantially cured inner resin coating and a fusible curable outer resin coating.

Abstract: A method for producing an improved particulate material for use in treating subterranean formations as a proppant and/or as a fluid loss agent in hydraulic fracturing and as a screening material in gravel packing comprised of heat curable particles capable of forming a cohesive mass, said particles comprised of a high strength center, a coupling agent chemically bound to the center with a heat curable resin coated over the center.

Abstract: A high strength self-consolidating particle comprised of a particulate substrate, a substantially cured inner resin coating and a fusible curable outer resin coating.

Abstract: A method of preventing collapse of performation tunnels extending from a well bore into a subterranean formation by filling the tunnels with self-consolidating resin coated particles and curing the resin coated particles into a permeable matrix.

Abstract: A method of treating a subterranean formation comprising hydraulically fracturing the formation and filling the fractures with a self-consolidating proppant. The proppant is consolidated and the formation then acidized to produce channels of increased conductivity adjacent the consolidated proppant.

Abstract: A method for treating a subterranean formation comprised of placing in or adjacent the formation a quantity of free-flowing, heat curable particles comprised of a high strength center, a coupling agent chemically bound to the center, a heat curable resin coated over the center; and causing said free flowing particles in or adjacent the formation to form a cohesive mass.

Abstract: Particles coated with a fusible thermosetting resin are placed in the vicinity of a wellbore and in conjunction with a subterranean formation surrounding the wellbore and are cured in the presence of a treating solution containing a softening agent capable of reducing the fusion temperature of the resin.

Abstract: A turbo drill which is connected to a string of drill pipe as a rotating shaft for driving a drill bit which may be a rotary bit or a high speed solid head diamond bit. The turbine section has rotor and stator blades which are cresent shaped in cross section with each blade having an exit angle of 14.degree. - 23.degree. for maximum turbine efficiency. The bearing shaft is provided with chevron rotary seals positioned below the rotary bearings carrying both radial and vertical thrust. Fluid lubricant fills the space from the rotary seals to a predetermined level above the bearings. A piston seals the lubricant chamber and is pressurized by drilling fluid (i.e. mud) flowing through the tool. A layer of lubricant fluid overlies the first piston and has a second piston covering said fluid and transmitting pressure from the drilling fluid to the lubricant fluid surrounding the bearings.