Abstract: A debris screen, sealingly and releasably latched to the top of a polished bore of a downhole tool for preventing the ingress of debris into the polished bore. Typically the debris screen is connected to a tieback receptacle of a liner hanger assembly. The debris screen is connected to a setting tool and is axially moveable on the setting tool permitting the setting tool to be stroked inside the liner hanger assembly during normal operations, such as cementing while retaining the debris screen at the top of the tieback receptacle at all times except during the final stages of retrieval. The debris screen has a tubular sleeve having a plurality of ports, covered by a wedge wire screen through which fluids can flow. Further, the latching mechanism has a plurality of ports to permit the flow of debris-free fluids from the wellbore into the annulus between the setting tool and the downhole tool.

Abstract: A liner hanger, in either a non-rotating or rotating format, has a large hanging capacity due to a one or more axially spaced sets of circumferentially spaced slips housed in openings in a slip housing, the slip housing being moveable axially relative to a mandrel for actuating the slips over cams supported by the mandrel. One or more sets of sets of slips are spaced axially along the slip housing. An annular space is formed between the mandrel and slip housing for maximizing fluid bypass through the annular space. Bypass is further improved by profiling the slip housing. In the rotating version, a separate sleeve is positioned between the mandrel and the slip housing for supporting the cams and the mandrel is supported on the cam sleeve through an upper bearing which permits the mandrel to rotate on the cam sleeve when the slips are set.