Abstract: A frac plug is adapted for setting in a well liner by fluid pressure. The frac plug comprises a radially expandable body and a cone. The radially expandable body has an axial bore providing the expandable body with a tapered inner surface. The cone occludes the axial bore of the expandable body. It has a tapered outer surface engaging the tapered inner surface of the radially expandable body. The cone is adapted, in response to fluid pressure above the cone, to be displaced axially within the radially expandable body from an unset position to a set position, thereby expanding the expandable body and setting the frac plug in the liner.

Abstract: Toe valves comprising a bore, a first sub, a second sub, and a housing. The bore extends through the valve. The first sub has separable elements. The separable elements comprise a first sub element and a sleeve element. The first sub element and sleeve element are joined by a relatively weak bridging portion adapted to break in a controlled manner in response to fluid pressure between the first sub element and the sleeve element. They thereby form an integral component comprised of the separable elements. The housing has a port and couples the first sub element and second sub.

Abstract: A frac plug apparatus has a plug body that comprises a central bore and separable elements. The central bore extends axially through the plug body. The separable elements are joined by relatively weak bridging portions adapted to break in a controlled manner, the separable elements thereby forming an integral component comprised of the separable elements. The separable elements comprise a wedge element and an array of slip elements. The slip elements are joined to the wedge element by first bridging portions.

Abstract: A frac plug apparatus has a plug body that comprises a central bore and separable elements. The central bore extends axially through the plug body. The separable elements are joined by relatively weak bridging portions adapted to break in a controlled manner, the separable elements thereby forming an integral component comprised of the separable elements. The separable elements comprise a wedge element and an array of slip elements. The slip elements are joined to the wedge element by first bridging portions.