A wellbore plug isolation system and method for positioning plugs to isolate fracture zones in a horizontal, vertical, or deviated wellbore is disclosed. The system/method includes a wellbore casing laterally drilled into a hydrocarbon formation, a wellbore setting tool (WST) that sets a large inner diameter (ID) restriction sleeve member (RSM), and a restriction plug element (RPE). The WST is positioned along with the RSM at a desired wellbore location. After the WST sets and seals the RSM, a conforming seating surface (CSS) is formed in the RSM. The CSS is shaped to engage/receive RPE deployed into the wellbore casing. The engaged/seated RPE isolates heel ward and toe ward fluid communication of the RSM to create a fracture zone. The RPE's are removed or left behind prior to initiating well production without the need for a milling procedure. A large ID RSM diminishes flow constriction during oil production.

A plug assembly includes a continuous expandable sealing ring having an embedded radial gap feature. The continuous expandable sealing ring includes a first section with a prominent external surface, whereby the first section with a prominent external surface includes a radial gap underneath, and a second section with a second external surface. During the setting of the plug, the first prominent external surface comes in contact with the internal surface of the tubing string, while the radial gap underneath allows avoiding transmitting radial forces from the continuous sealing ring towards the tubing string, therefore keeping the majority of the force transmission from the expandable gripping ring towards the tubing string.

A plug assembly includes a continuous expandable sealing ring having an embedded radial gap feature. The continuous expandable sealing ring includes a first section with a prominent external surface, whereby the first section with a prominent external surface includes a radial gap underneath, and a second section with a second external surface. During the setting of the plug, the first prominent external surface comes in contact with the internal surface of the tubing string, while the radial gap underneath allows avoiding transmitting radial forces from the continuous sealing ring towards the tubing string, therefore keeping the majority of the force transmission from the expandable gripping ring towards the tubing string.

A borehole mill has blades that extend radially while moving along an inclined dovetail as a result of setting down weight on a mandrel. The blades extend axially beyond the end of the mandrel so that setting down weight disables a retainer that has the blades retracted for running in. Axial displacement of the blades along respective dovetails breaks a shear pin on a follower sleeve that is spring biased off a gage ring on the mandrel such that the spring stays compressed as long as set down weight is applied and once the mill is picked up the spring pushes the blades axially along a dovetail to the radially retracted position. The mill resumes its smallest dimension for pulling out of the hole.

A borehole mill has blades that extend radially while moving along an inclined dovetail as a result of setting down weight on a mandrel. The blades extend axially beyond the end of the mandrel so that setting down weight disables a retainer that has the blades retracted for running in. Axial displacement of the blades along respective dovetails breaks a shear pin on a follower sleeve that is spring biased off a gage ring on the mandrel such that the spring stays compressed as long as set down weight is applied and once the mill is picked up the spring pushes the blades axially along a dovetail to the radially retracted position. The mill resumes its smallest dimension for pulling out of the hole.

A method of making a radially expandable device, including extruding a bulk of a material in an extrusion direction to form an extruded member. The material operatively arranged to disintegrate upon exposure to a selected borehole fluid; and forming a tubular body with the extruded member such that the extrusion direction is aligned circumferentially with respect to the tubular body.

A method of making a radially expandable device, including extruding a bulk of a material in an extrusion direction to form an extruded member. The material operatively arranged to disintegrate upon exposure to a selected borehole fluid; and forming a tubular body with the extruded member such that the extrusion direction is aligned circumferentially with respect to the tubular body.

A mill-drill cutter for an earth boring bit includes a cutting structure secured to a substrate. The cutting structure has a drilling edge, and the substrate has a milling edge. The substrate is configured to be received in a cutter pocket of the earth boring bit. The drilling edge of the cutting structure is disposed radially internal to the milling edge of the substrate.

A mill-drill cutter for an earth boring bit includes a cutting structure secured to a substrate. The cutting structure has a drilling edge, and the substrate has a milling edge. The substrate is configured to be received in a cutter pocket of the earth boring bit. The drilling edge of the cutting structure is disposed radially internal to the milling edge of the substrate.

The present invention relates to a downhole wireline tool for performing a machining operation, such as milling, in a well having a top, the downhole wireline tool having a longitudinal axis, a first end configured to be connected to a wireline and a second end forming a front of the tool facing away from the wireline along the longitudinal axis, the downhole wireline tool comprising a tool housing, a holding section having projectable parts configured to prevent a part of the downhole wireline tool from moving in a direction towards the top, a machining tool arranged in the front of the tool, and a rotation unit for rotating the machining tool, wherein the downhole wireline tool further comprises an oscillation device having a rotational stationary part being connected with the rotation unit and a rotational part being connected to the machining tool, the oscillation device being configured to provide an oscillating movement of the machining tool by oscillating the rotational part in relation to the rotational stationary part.