(19)
(11) EP 2 749 733 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.11.2016 Bulletin 2016/44

(43) Date of publication A2:
02.07.2014 Bulletin 2014/27

(21) Application number: 14161780.3

(22) Date of filing: 23.05.2005
(51) International Patent Classification (IPC): 
E21B 49/10(2006.01)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 21.05.2004 US 573293 P
21.05.2004 US 573294 P
20.05.2005 US 133643
20.05.2005 US 133712

(62) Application number of the earlier application in accordance with Art. 76 EPC:
05753972.8 / 1747347

(71) Applicant: HALLIBURTON ENERGY SERVICES, INC.
Houston, TX 77072-5206 (US)

(72) Inventors:
  • Gilbert, Gregory N.
    Sugar Land, TX Texas 77479 (US)
  • Sitka, Mark A.
    Richmond, TX Texas 77469 (US)
  • MCGregor, Malcolm Douglas
    The Woodlands, TX Texas 77381 (US)
  • Gray, Glenn C.
    Austin, TX Texas 78731 (US)
  • Hardin, JR., John R.
    Spring, TX Texas 77379 (US)
  • Maranuk, Christopher Anthony
    Houston, TX Texas 77079 (US)
  • Stone, James E.
    Porter, TX Texas 77365 (US)
  • Sherril, Kristopher V.
    Humble, TX Texas 77346 (US)

(74) Representative: Jennings, Michael John 
A.A. Thornton & Co. 10 Old Bailey
London EC4M 7NG
London EC4M 7NG (GB)

   


(54) Downhole probe assembly


(57) This application relates to a downhole formation testing tool having an extendable sample apparatus and methods of use. In one embodiment, the extendable apparatus includes a piston that extends toward a borehole wall (49), the piston having an inner sampling member that is also extendable. The sampling member may be further extended to engage the borehole wall and penetrate the formation. The sampling member may also include a screen and an inner scraper (278) that frictionally engages the screen and reciprocates to remove debris from the screen. The piston may comprise a seal pad having an internal cavity for receiving a volume of fluid. In another embodiment, the extendable apparatus comprises multiple, concentric pistons for extending the sampling member further toward the borehole wall than is possible with a single piston. In one embodiment, the formation testing tool includes a hydraulic circuit and controller for operating the extendable sample apparatus; the tool may also include hydraulic accumulators and a regenerative hydraulic circuit.







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