Patent ID: 8991505
Filing Date: 2015-03-31
Classification: E21B

Abstract:
1. A downhole tool adapted for use in a tubular string to selectively treat one or more hydrocarbon production zones, comprising: an upper end and a lower end adapted for interconnection to a tubular string; a catch mechanism positioned proximate to said lower end and adapted to selectively catch or release a ball traveling through said tubular string based on a fluid pressure in said tubular string proximate to said downhole tool; a retractable sleeve which travels in a longitudinal direction with respect to said tubular string between a first position and a second position, and which is actuated based on an internal pressure in the tubular string proximate to said downhole tool, said retractable sleeve preventing a flow of a treatment fluid in a lateral direction into an annulus of the wellbore while in said first position, and permitting the flow of the treatment fluid in the lateral direction through at least one port in said second position; and a flapper valve in operable engagement with said retractable sleeve, wherein when said retractable sleeve is in said second position, said flapper value is closed and the treatment fluid flows through the at least one port into an annular space and cannot be pumped downstream of said flapper valve in the tubular string, and wherein when said retractable sleeve is in said first position, said flapper is opened and the treatment fluid is prevented from flowing through the at least one port; wherein if the pressure in said tubular string is above a second level, said catch mechanism allows said ball to pass and said flapper is opened, and wherein if the pressure is reduced from said second level, said retractable sleeve returns to said first position; and wherein if the pressure in said tubular string is below the second level and at or above a first level, said catch mechanism catches said ball wherein said retractable sleeve moves from said first position to said second position and said flapper moves from an open position to a closed position.