A downhole apparatus including a sleeve, a tool string, a plug, a means for setting the plug wherein an upper portion of the sleeve is connectable to a lower portion of the tool string, and a lower portion of the sleeve is arranged to receive the plug and the means for setting the plug. A method for using the downhole apparatus (1) is disclosed.

A gravel pack system includes a liner assembly and a deployment assembly. The liner assembly includes a sand control screen. The deployment assembly facilitates rotation of the liner assembly and circulation through the liner assembly while running the liner assembly into a wellbore using a work string. The deployment assembly includes a crossover tool that is operated to facilitate gravel packing without manipulation of the work string. The deployment assembly also includes a setting tool for setting a packer and/or a sand barrier at the top of the liner assembly.

A gravel pack system includes a liner assembly and a deployment assembly. The liner assembly includes a sand control screen. The deployment assembly facilitates rotation of the liner assembly and circulation through the liner assembly while running the liner assembly into a wellbore using a work string. The deployment assembly includes a crossover tool that is operated to facilitate gravel packing without manipulation of the work string. The deployment assembly also includes a setting tool for setting a packer and/or a sand barrier at the top of the liner assembly.

A plug assembly, dedicated for ball-in-place operation, includes an expandable assembly, a locking ring, a cup and studs, to be deployed using a retrievable setting tool. The expandable assembly is adapted to be deformed radially over the locking ring and the cup, while the locking ring is retained longitudinally relative to a mandrel of the retrievable setting tool, thanks to the studs positioned within the cup. The locking ring has a stopping inner surface. The combination of the cup and an untethered object is adapted to contact an inner surface of the plug assembly and, using well fluid pressure, to apply forces to the plug assembly. The forces cause the longitudinal movement of the cup and untethered objects while contacting the inner surface of the plug assembly until the cup contacts the stopping inner surface of the locking ring.

A downhole method for preparing and/or providing isolation at a predetermined position in an existing well having a top and a first well tubular metal structure arranged in a wellbore, the first well tubular metal structure having a longitudinal extension, comprising inserting a downhole tool comprising a bit on a projection part in the first well tubular metal structure, positioning the downhole tool opposite the predetermined position, separating a first section being an upper part of the first well tubular metal structure from a second section being a lower part of the first well tubular metal structure by machining into and along a circumference of the first well tubular metal structure, moving the downhole tool a predetermined distance along the longitudinal extension in the first section of the first well tubular metal structure to a second position above the predetermined position, and separating a first part of the first section of the first well tubular metal structure from a second part of the first section of the first well tubular metal structure by machining into and along a circumference of the first well tubular metal structure, providing an uncased opening between the second part of the first section and the second section.

A method of production of a frac plug is disclosed comprising providing a blank defining an interior of the frac plug, placing a glass material around the blank such that a fiber reinforcement within the glass material is off axis to a longitudinal axis of the frac plug and wherein the placing forms a glass material blank, removing the blank from the glass material blank and performing at least one mechanical processing of an exterior of the glass material blank.

A chemical composition for a degradable polymeric material includes an isocyanate terminated prepolymer, including prepolymer units as a main chain with a plurality of isocynanates at ends of the main chain, a catalyst additive, and a cross-linking agent. The isocyanate terminated prepolymer can be an isocyanate terminated polyester, polycarbonate or polyether prepolymer. The isocyanate terminated prepolymer has a structural formula as follows:

ONC—R″—NH—[—CO—R—CO—O—R′—O—]n—NH—R″—CNO

wherein R, R′ and R″ are an aryl group or alkyl group and wherein n is a number of prepolymer units corresponding to length of the main chain. The composition degrades at a rate and at a delay for failure between 8-72 hours. The composition is a dissolvable rubber material with a modulus and elongation suitable for a component of a downhole tool.

A chemical composition for a degradable polymeric material includes an isocyanate terminated prepolymer, including prepolymer units as a main chain with a plurality of isocynanates at ends of the main chain, a catalyst additive, and a cross-linking agent. The isocyanate terminated prepolymer can be an isocyanate terminated polyester, polycarbonate or polyether prepolymer. The isocyanate terminated prepolymer has a structural formula as follows:

ONC—R″—NH—[—CO—R—CO—O—R′—O—]n—NH—R″—CNO

wherein R, R′ and R″ are an aryl group or alkyl group and wherein n is a number of prepolymer units corresponding to length of the main chain. The composition degrades at a rate and at a delay for failure between 8-72 hours. The composition is a dissolvable rubber material with a modulus and elongation suitable for a component of a downhole tool.

Methods of plugging a hydrocarbon well by using degradable plugs are provided. When the plug is no longer needed, a degradation fluid or fluids are pumped downhole under high pressure, typically via jet, such that the degradation fluid provides an erosive force to the degradable plug, thus both speeding its degradation and preventing or minimizing the leaving of solid plug material remnants in the well.

A plug system includes a lower plug, an upper plug, and a sleeve configured to be positioned at least partially within the lower plug, the upper plug, or both. The sleeve defines one or more channels in an outer surface thereof. The sleeve is configured to shift axially from a first position into a second position with respect to the lower plug. In the first position, fluid is prevented from flowing through the one or more channels. In the second position, the fluid is permitted to flow through the lower plug via the one or more channels.