Combined perforating and fracking tool

摘要

A combined perforating and fracking tool, and method for using same, for perforating a hydrocarbon well casing and for subsequently fracturing the formation while maintaining the tool in situ. The combined perforating and fracking tool comprises, in a preferred embodiment, a series of connected cylinders arranged to be disposed in a well casing, each of the cylinders comprising a cooperating piston whereby a magnification of hydraulic force is generated. The series of pistons operate to actuate a punch assembly disposed at a downhole end of the series of connected cylinders to perforate the casing. A fluid injection port, in operation with at least one sealing member disposed at each end of the series of connected cylinders, allows fluid to be diverted into the formation through the perforations created in the well casing to induce fracturing in the formation.

主权项

1. A combined perforating and fracking tool for perforating a hydrocarbon well casing disposed in a formation and for subsequently fracturing the formation while maintaining the tool in situ, the tool comprising:
(a) at least one cylinder arranged to be disposed in a well casing and adapted at an uphole end to receive a delivered fluid that is delivered into the tool, said cylinder comprising a cooperating piston; (b) a punch assembly disposed at a downhole end of said cylinder and co-operating piston, the punch assembly comprising a punch comprising a pointed piercing member for perforating the casing, wherein the punch assembly is actuated by the delivered fluid exerting an actuation pressure on the cooperating piston, and the cooperating piston exerting a force which causes outward extension of the pointed piercing member to perforate the casing; (c) a fluid injection port disposed at an upper end of the tool to allow at least some of the delivered fluid to be injected into the formation through the perforations created in the well casing by the tool; (d) at least one sealing member disposed proximate an upper uphole end of the cylinder, downhole of said fluid injection port, adapted to prevent fracking fluid from travelling, when such tool is in a well casing, outside the cylinder in a direction downhole; and a valve assembly disposed between the fluid injection port and said cylinder, the valve assembly actuatable between a first position and a second position, when in the first position at least some of the delivered fluid flows through the fluid injection port and wherein the punch assembly is isolated from the delivered fluid, and when in the second position at least some of the delivered fluid flows through the valve assembly for exerting the actuation pressure on the cooperating piston to actuate the punch assembly and extend said pointed piercing member to perforate the casing, wherein the delivered fluid may be provided in a bore defined along a longitudinal axis of said cylinder.