(19)
(11) EP 1 936 112 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.07.2008 Bulletin 2008/30

(43) Date of publication A2:
25.06.2008 Bulletin 2008/26

(21) Application number: 08004186.6

(22) Date of filing: 19.09.2001
(51) International Patent Classification (IPC): 
E21B 47/10(2006.01)
E21B 21/00(2006.01)
 E21B 21/08(2006.01)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

(30) Priority: 25.04.2001 US 842488

(62) Application number of the earlier application in accordance with Art. 76 EPC:
01971214.0 / 1397579

(71) Applicant: HALLIBURTON ENERGY SERVICES, INC.
Houston, TX 77020 (US)

(72) Inventors:
  • Rester, Stephen
    Houston, TX 77083 (US)
  • Hunt, James L.
    Katy, TX 77450 (US)
  • Wiemers, Tim
    Houston, TX 77041 (US)
  • Chacon, Edgar
    Al-Khobar 31962 (SA)
  • Baldauff, John
    Houston, TX 77210 (US)
  • Johnson, Michael H.
    Katy, TX 77450 (US)
  • Allen, Rob L.
    Spring, TX 77386 (US)

(74) Representative: Lawrence, John 
Barker Brettell LLP 138 Hagley Road
Edgbaston Birmingham B16 9PW
Edgbaston Birmingham B16 9PW (GB)

   


(54) Method, system and tool for reservoir evaluation and well testing during drilling operations


(57) In one form of the invention, a formation evaluation is made using a direct measurement of the formation's ability to flow fluids. The flow potential of a reservoir during underbalanced well construction is determined as the well is being constructed. The trajectory and path of the wellbore through the reservoir are modified to intersect formation having more desirable permeability and productivity to decrease the time to market of the hydrocarbon reserves within a reservoir without the time delay inherent when conventional formation evaluation techniques are applied. A downhole flow measurement instrument (27) is used to obtain actual flow ratios. The instrument is integrated into a near-bit stabilizer (12) and can be used for early kick and benign "breathing" fractures detection in the open hole wellbore.







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