STRADDLE TOOL WITH DISCONNECT BETWEEN SEALS

摘要

A bottom hole assembly (BHA) enables a one trip procedure to set a bridge plug and release from that bridge plug with the BHA. A perforating gun is fired and a straddle tool above the gun in repositioned to wash the perforations as the opposed packer cups are moved along the perforations. At the end of the washing step a dropped ball closes a circulation port above the upper packer cups and the ball seat is blown out. A disconnect releases the lower part of the straddle tool with the lower packer cups that are uphole oriented. Cement can now be delivered past the upper packer cups and pressurized to squeeze the cement into the perforations using the upper cups to hold the pressure. Another ported sub above the upper cups has a port opened to prevent swabbing as the BHA is removed.

主权项

1. A drill pipe string borne borehole assembly comprising a washing tool assembly, comprising:
a main body having an axial main bore passage with one or more laterally directed perforation wash ports, provided with one or more lower swab cups below and one or more upper swab cups above said main body; a lower ported sub having at least one port below said lower swab cups and a bypass passage to an upper ported sub with at least one port above said upper swab cups, an actuated valve arranged for closing said one or more upper port; and a disconnector for said main body including said main bore passage for forming a wide aperture at a remaining lower end of said disconnected main bore passage for pumping out cement.