Abstract: Disclosed is a liner top test tool with a scraper cartridge and seal back-up rings for testing casing integrity in a wellbore. The seal back-up rings are comprised of first and second ring elements that are biased apart by compression springs. The first ring element has a boss that inserts into a bore of the second ring element, blocking debris from flowing into the interior of the seal back-up ring.

Abstract: Disclosed is a liner top test tool with a scraper cartridge and seal back-up rings for testing casing integrity in a wellbore. The seal back-up rings are comprised of first and second ring elements that are biased apart by compression springs. The first ring element has a boss that inserts into a bore of the second ring element, blocking debris from flowing into the interior of the seal back-up ring.

Abstract: A back-up ring for use in a liner top test tool for testing casing integrity in a wellbore is disclosed. The back-up ring is comprised of first and second ring elements that are biased apart by a compression springs. The first ring element has a plurality of radially extending flanges that cover a plurality of channels in the second ring element when the back-up ring is compressed against a seal element on the liner top test tool to seal the wellbore casing.

Abstract: An autonomous junk collecting sleeve for a riser is provided. The sleeve is constructed and arranged to be independently lowered and seated above a subsea tree section and, subsequently, raised and removed independent of the work string. The autonomous junk collecting sleeve includes a first cylindrical structure, a second cylindrical structure concentric to the first cylindrical structure and which are joined together in spatial relation at a bottom end to form an interior J-channel basket. The J-channel basket is operable to collect debris traveling up through the bottom end and over of the second cylindrical structure for deposit therein.

Abstract: A downhole circulating tool including a sleeve with a cam slot having continuous and symmetrical wishbone patterns through which a cam pin moves. The cam pin moves simultaneously through symmetrical portions of the cam slot to alternate the opening and closing of first and second fluid port openings. A first port opening is operable to communicate fluid to a drill bit when open. A second port opening is operable to communicate fluid directly into the borehole or casing wall of a wellbore when open.

Abstract: An autonomous junk collecting sleeve for a riser is provided. The sleeve is constructed and arranged to be independently lowered and seated above a subsea tree section and, subsequently, raised and removed independent of the work string. The autonomous junk collecting sleeve includes a first cylindrical structure, a second cylindrical structure concentric to the first cylindrical structure and which are joined together in spatial relation at a bottom end to form an interior J-channel basket. The J-channel basket is operable to collect debris traveling up through the bottom end and over of the second cylindrical structure for deposit therein.