(19)
(11) EP 0 100 230 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.05.1985 Bulletin 1985/20

(43) Date of publication A2:
08.02.1984 Bulletin 1984/06

(21) Application number: 83304298

(22) Date of filing: 25.07.1983
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 26.07.1982 US 401613
02.03.1983 US 471437
02.03.1983 US 471430

(71) Applicants:
  • Dickinson III, Ben Wade Oakes
     ()
  • Dickinson, Robert Wayne
     ()

(72) Inventors:
  • Dickinson III, Ben Wade Oakes
     ()
  • Dickinson, Robert Wayne
     ()
  • Hutchison, Stanley O.
     ()
  • May, Sherman C.
     ()
  • Mackey, Charles S.
     ()

   


(54) Earth drilling apparatus and method


(57) 0 Apparatus for forming a bore hole in an underground formation including a guide pipe (30, 32) with a fluid seal and a tube (34) sealed with the seal and terminating in a drillhead (36) with at least one fluid exit port. The tube moves out the exit end of the guide pipe into the formation under hydraulic pressure applied against the drillhead. Preferably, the bottom of the guide tube includes a whipstock (30a, 32a) to turn the drillhead, preferably from a vertical to a horizontal direction, to form a radial. The whipstock may be stationary or may be extendible.






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