Patent ID: 8607875
Filing Date: 2013-12-17
Classification: E21B

Abstract:
1. A method of selectively opening and closing a valve positioned at a subterranean location in a wellbore, comprising the steps of: providing a tubing string; providing a valve having a valve element movable between an open position and a closed position; connecting the valve in the tubing string to block and permit flow between the interior and exterior of the tubing string and positioning the valve in the wellbore at a subterranean location; moving the valve element from the closed position to the open position by rotating the tubing string in the first direction; after moving the valve to the open position continuing to rotate the tubing string in the first direction while maintaining the valve element in the open position; after continuing to rotate the tubing string while maintaining the valve in to open position discontinuing rotation of the tubing string while maintaining the valve element in the open position; moving the valve element from the open position to the closed position by rotating the tubing string in the first direction; after moving the valve to the closed position continuing to rotate the tubing string in the first direction while maintaining the valve element in the closed position; and after continuing to rotate the tubing string while maintaining the valve in the closed position discontinuing rotation of the tubing string while maintaining the valve element in the closed position.