Sliding sleeve locking mechanisms

A sliding sleeve valve that is lockable in at least one of an open or a closed position, the sleeve valve comprising:

• an outer housing defining a flowbore and a lateral fluid flow port disposed through the housing;
• a sliding sleeve member disposed within the flowbore and axially moveable within by a shifting tool disposed within a wellbore from a surface location between a first, open position wherein the lateral fluid flow port is not blocked by the sliding sleeve member and a second, closed position wherein the lateral fluid flow port is blocked by the sliding sleeve member;
• a locking assembly comprising;
• a) a locking bore portion within the outer housing flowbore having a first locking groove formed therein;
• b) a sliding sleeve collet member that is moveably disposed within the outer housing, affixed to the sliding sleeve member and having a collet finger with a tab shaped and sized to reside within the first locking groove to correspond to an open position for the sliding sleeve valve;
• c) a collet locking member that is moveably disposed within the sliding sleeve collet member to selectively lock that collet finger tab in the first locking groove;
• and
• d) a second locking groove formed within the outer housing that is shaped and sized to permit the tab of the collet finger to reside within and corresponding to a closed position for the sliding sleeve valve.

A method of selectively locking a sliding sleeve valve into an open/closed configuration, the method comprising the steps of:

• providing the sliding sleeve valve having:
• a) an outer housing defining a flowbore and a lateral fluid flow port disposed through the housing;
• b) a sliding sleeve member disposed within the flowbore and axially moveable within between a first, open position wherein the lateral fluid flow port is not blocked by the sliding sleeve member and a second, closed position wherein the lateral fluid flow port is blocked by the sliding sleeve member;
• securing the sliding sleeve member to a sliding sleeve collet member;
• locating the sliding sleeve member at a desired location within the outer housing by latching a tab of the sliding sleeve collet member within either of a first locking groove or a second locking groove within the flowbore, each of the locking grooves corresponding to one of either the first, open position or the second, closed position;
• and
• locking the sliding sleeve member at the desired location by urging a dog member radially outwardly and into a locking groove in the housing.