HYDRAULIC SLIDING SIDE-DOOR SLEEVE

摘要

The present invention relates to hydraulically operated sliding side-door sleeves for use in wellbores. The invention provides an assembly (2) comprising an outer member (4) defining a bore and an inner member (38) defining a bore. The inner member (38) is slidably located within the bore of the member (4) so as to be movable between an open position and a closed position. The assembly (2) further comprises controlling means for selectively placing the inner member (38) in the open or closed positions. The controlling means comprises a spring (46) for biasing the inner member (38) in one axial direction relative to the outer member (4), means for shifting the inner member (38) relative to the outer member (4) against the bias of the spring (46); and selectively releasable latching means for latching the inner member (38) in the shifted position. The present invention has the advantage of being readily used in both vertical and "high angle" or horizontal wellbores.