(19)
(11) EP 0 523 951 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.05.1993 Bulletin 1993/19

(43) Date of publication A2:
20.01.1993 Bulletin 1993/03

(21) Application number: 92306422.4

(22) Date of filing: 14.07.1992
(51) International Patent Classification (IPC)5: E21B 34/08, E21B 34/06, E21B 41/00
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 15.07.1991 US 730211

(71) Applicant: HALLIBURTON COMPANY
Duncan Oklahoma 73536 (US)

(72) Inventors:
  • Schultz, Roger L.
    Richardson, Texas 75080 (US)
  • Zitterich, Craig L.
    Corinth, Texas 76205 (US)

(74) Representative: Wain, Christopher Paul et al
A.A. THORNTON & CO. Northumberland House 303-306 High Holborn
London WC1V 7LE
London WC1V 7LE (GB)


(56) References cited: : 
   
       


    (54) Downhole tool with actuator


    (57) An actuator apparatus for a downhole tool, such as a downhole shut-in tool, comprises mechanical actuator means (132) for actuating said tool; drive means (134), operably associated with said mechanical actuator means, for moving said mechanical actuator means; abutment means (156) for abutting said mechanical actuator means to limit movement thereof and thereby define at least one position of said mechanical actuator means; and control means (164) for controlling said drive means (134), said control means including and being responsive to a load sensing means for sensing an increased load on said drive means when said mechanical actuator means abuts said abutment means.






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