초록 ▼

A tubing conveyed perforating apparatus is shown which includes a tubular firing section which carries a plurality of explosive charges. The explosive charges are initially aligned with regions of reduced wall area provided in a tubular firing section which initially surrounds the charges. A piston

A tubing conveyed perforating apparatus is shown which includes a tubular firing section which carries a plurality of explosive charges. The explosive charges are initially aligned with regions of reduced wall area provided in a tubular firing section which initially surrounds the charges. A piston sleeve is mounted on the exterior of the firing section. The piston sleeve has a plurality of apertures which are initially aligned with the regions of reduced wall area in the tubular firing section and thus with the explosive charges. Detonation of the charges causes the piston sleeve to shift so that the piston sleeve apertures are out of alignment with openings formed in the tubular firing section by the detonation of the charges, thereby trapping any resulting debris within the interior of the tubular firing section. Firing of the explosive charges opens upper and lower circulating ports so that sand or other debris can be reverse circulated up the interior of the well string to the well surface. A piston actuated retrieving head can be utilized to engage and retrieve a sealing plug from a sump packer within the well bore.

대표청구항 ▼

[ What is claimed is:] [1.]1. A tubing conveyed perforating apparatus used in perforating a surrounding well bore, the apparatus comprising:a tubular assembly made up of a plurality of tubular sections, the tubular sections presenting a generally cylindrical exterior and a concentric interior bore,

[ What is claimed is:] [1.]1. A tubing conveyed perforating apparatus used in perforating a surrounding well bore, the apparatus comprising:a tubular assembly made up of a plurality of tubular sections, the tubular sections presenting a generally cylindrical exterior and a concentric interior bore, the tubular assembly having an upper connecting end for connection in a tubing string extending to the well surface and a lower end;at least one selected tubular section comprising a tubular firing section having a plurality of explosive charges carried therein, each of the explosive charges being initially aligned with a region of reduced wall area provided within the tubular firing section surrounding the explosive charges;a piston sleeve mounted on the exterior of the tubular firing section, the piston sleeve having a plurality of apertures therein which are initially aligned with the respective regions of reduced wall area provided in the tubular firing section and thus with the explosive charges;a firing means located within the tubular assembly for detonating the explosive charges to puncture the regions of reduced wall area, thereby creating openings in the tubular firing section, while perforating the surrounding well bore;pressure responsive means for applying a shifting force to the piston sleeve, whereby the piston sleeve apertures are moved out of alignment with the respective openings created in the tubular firing section to thereby trap any resulting debris within the interior bore of the tubular firing section.