Downhole sub with hydraulically actuable sleeve valve

A method for opening a port through the wall of a ported sub, the method comprising:

• providing a sub with a port through its tubular side wall;
• providing a hydraulically actuable valve to cover the port, the valve being actuable to move away from a position covering the port to thereby open the port;
• increasing pressure within the sub to create a pressure differential across the valve to move the valve toward the low pressure side, while the port remains closed by the valve;
• thereafter, reducing pressure within the sub to reduce the pressure differential;
• and
• driving the valve to move it away from a position covering the port.

A method of accessing a hydrocarbon laden formation comprising:

• Running into a wellbore with a tubing string including a plurality of fluid flow regulating mechanisms grouped into a plurality of areas including a first area including one or more of the plurality of fluid flow regulating mechanisms and a second area including one or more of the plurality of fluid flow regulating mechanisms;
• positioning the tubing string into a wellbore extending into the hydrocarbon laden formation;
• actuating substantially simultaneously all of the fluid flow regulating mechanisms comprising the first area to access the hydrocarbon laden formation along the first area;
• and
• actuating substantially simultaneously all of the fluid flow regulating mechanisms comprising the second area to access the hydrocarbon laden formation along the second area.

A sleeve valve sub comprising:

• a tubular segment including a wall defining therein an inner bore;
• a first port through the wall of the tubular segment;
• a second port through the wall of the tubular segment;
• a sleeve supported by the tubular segment and installed to be axially moveable relative to the tubular segment from a first position covering the first port to a second position away from a covering position over the first port, the sleeve covering second port in the first position and the second position, the sleeve including an inner facing surface defining a full bore diameter, an inner diameter constriction on the inner diameter of the sleeve having a diameter less than the full bore diameter;
• an outer facing surface, an indentation on the outer facing surface radially aligned with the inner diameter constriction, the indentation defined by a extension of the outer facing surface protruding inwardly of the full bore diameter, the indentation being positionable over the second port when the sleeve is in the second position such that the second port is openable to fluid flow therethrough by removal of the inner diameter constriction.