Patent ID: 6371209
Filing Date: 2002-04-16
Classification: E21B

Abstract:
A well casing installation and removal adapter for a hammer drill having an axially elongated axially vertically oriented barrel comprising: a unitary axially elongated generally cylindrical stucture including a cylindrical main body portion having a male hammer chuck thread for mating coengagement with a female hammer chuck thread within a lower end of a hammer drill barrel, an integral diametrically enlarged annular flange portion disposed below the main body portion and defining a radially disposed and upwardly facing abutment surface for engaging a downwardly facing end surface on the lower end of the hammer drill barrel, an integral diametrically reduce coaxial cylindrical protion projecting upwardly from said main body portion and having an upwardly facing bearing surface for engaging and holding a reciprocally axially movable part of the hammer drill in an elevated position within the barrel corresponding to an operative condition of the hammer drill to maintain the hammer drill in said operative condition at all times, coupling means at the lower end of said adapter for connecting said adapter to a pipe string, said casing installation and removale adapter having a generally cylindrical central bore extending coaxially therethrough and opening through an upper end and a lower end thereof, and a blow tube coaxially received within an upper end of said cnetral bore and extending axially upward for some distance beyond said abutment surface and forming an upward extension of said central bore wherein said flange portion has a generally coaxial sidewall and at least one exhaust port extending through said sidewall and communicating with said central bore, said at least one exhaust port for releasing compressed air.