Patent ID: 8393392

Claim:
A bottom hole assembly for one trip perforating and treating a wellbore, the bottom hole assembly comprising: a tool body including an outer surface and an upper end; a fluid passage extending into the tool body from the upper end; a valve to provide (i) in a first orientation, fluid access from the fluid passage to an outlet port opening to the outer surface and (ii) in a second orientation, fluid access from the fluid passage to a perforating gun actuation fluid supply channel while sealing fluid access from the fluid passage to the outer surface; an annular sealing member encircling the outer surface below the outlet port; and a perforating gun carried below the annular sealing member and hydraulically actuable to detonate by fluid communication through the perforating gun actuation fluid supply channel, wherein the valve operates to move between the first orientation and the second orientation in response to pressure differentials established across the valve between fluid pressure in the fluid passage and fluid pressure at the outlet port; and wherein the valve includes a large piston face having a first surface area acted upon by the fluid pressure at the outlet port and a small piston face having a second surface area acted upon by the fluid pressure in the fluid passage and the first surface area is greater than the second surface area such that the valve is unbalanced, being more reactive to fluid pressure at the outlet port than fluid pressure in the fluid passage.