Europäisches Patentamt
(19)
European Patent Office
*EP001103810A3*
Office européen des brevets
(11)
EP 1 103 810 A3
EUROPEAN PATENT APPLICATION
(12)
(88) Date of publication A3:
(51) Int Cl.7:
12.01.2005 Bulletin 2005/02
G01N 29/02, G01N 29/18
(43) Date of publication A2:
30.05.2001 Bulletin 2001/22
(21) Application number: 00204154.9
(22) Date of filing: 23.11.2000
(84) Designated Contracting States:
(72) Inventors:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU
MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI
(30) Priority: 26.11.1999 IT MI992474
(71) Applicants:
(74) Representative: De Gregori, Antonella et al
• ENI S.p.A.
00144 Roma (IT)
• ENITECNOLOGIE S.p.A.
20097 S. Donato Milanese (Milano) (IT)
(54)
• Marsala, Alberto
24100 Bergamo (IT)
• Del Gaudio, Lucilla
20097 San Donato Milanes (Milan) (IT)
• Carminati, Stefano
20052 Monza (Milan) (IT)
Ing. Barzano’ & Zanardo Milano S.p.A.
Via Borgonuovo 10
20121 Milano (IT)
Process for verifying the effectiveness of drilling fluids in stabilizing oil well walls
(57)
Process for measuring the effects on the mechanical properties of shales due to interaction with drilling fluids, which comprises:
(c) and measurement of the ultrasonic wave transmission velocity;
(e) comparison between the measurements of step
(d) and those of step (b).
EP 1 103 810 A3
(a) preparation of a shale sample;
(b) measurement of the transmission velocity of ultrasonic waves through the sample (a),
(c) preparation of a mixture of water- or oil-based
drilling fluid and the sample (a) ;
(d) removal of the shale sample (a) from the mixture
Printed by Jouve, 75001 PARIS (FR)
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