Patent AU-2011231513-B2 (AU)
Title: Method for determining the density of a multiphase fluid, densitometer using said method and multiphase meter using said densitometer
Inventor: NARDI PAOLO ADITEO
IPC: G01F1/74
Filed: 2011-04-28
Granted: 2012-12-13
Abstract: (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization II International Bureau (10) International Publication Number (43) International Publication Date 29 September 2011 (29.09.2011) PCT W O 2011/117426 Al (51) International Patent Classification: (81) Designated States (unless otherwise indicated, for every GO1F 1/74 (2006.01) GO1N 9/24 (2006.01) kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, (21) International Application Number: CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, PCT/EP2011/056799 DZ, EC, EE, EG, ES, Fl, GB, GD, GE, GH, GM, GT, (22) International Filing Date: HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, 28 April 2011 (28.04.2011) KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, (25) Filing Language: English NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD, (26) Publication Language: English SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (30) Priority Data: VI201OA000117 29 April 2010 (29.04.2010) IT (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, (71) Applicant (for all designated States except US): GM, KE, LR, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, PIETRO FIORENTINI SPA [IT/IT]; Via E. Fermi, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, MD, RU, TJ, 8/10, 1-36057 Arcugnano (VI) (IT). TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, (72) Inventors; and EE, ES, Fl, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, (75) Inventors/Applicants (for US only): NARDI, Paolo, LVMC,TR) MK, MT, NL, CF, P, T, R, GS, S , SK, Aditeo [IT/IT]; Via della Moscova, 40/1, 1-20121 Milano SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, (IT). CALCIOLARI, Paolo [IT/If]; Via F. Turati, 2, GW, ML, MR, NE, SN, TD, TG). 1-36045 Lonigo (VI) (IT). BERNARDI, Stefano [IT/IT]; Published: Via V. Polonio, 20,1-35129 Padova (IT). - with international search report (Art. 21(3)) (74) Agent: BONINI, Ercole; Studio Bonini Srl, Corso - upon request of the applicant, before the expiration of the Fogazzaro, 8, 1-36 100 Vicenza (IT). time limit referred to in Article 21(2)(a) (54) Title: METHOD FOR DETERMINING THE DENSITY OF A MULTIPHASE FLUID, DENSITOMETER USING SAID METHOD AND MULTIPHASE METER USING SAID DENSITOMETER N(57) Abstract: Method for determining the density (D) of a multiphase fluid (F) flowing through a pipe (1) and containing a gas (G) which determines a fluctuation of the actual instantaneous density of the fluid (F), said method comprising the following steps: defining a series of consecutive time periods (S0, 5) which are shorter than the time length corresponding to the highest fre quency-component of the fluctuation of the actual instantaneous density; conveying through a section (2) of the pipe (1) a photon beam (3) suited to undergo an attenuation while crossing the fluid (F); counting the actual number (A) of photons of the beam (3) Ni which cross the pipe (1) during a first time period (5) of the series; calculating a corrected count (C) as the weighted average value of the actual count (A) and of the previous corrected count (CO) calculated for the preceding time period (SO); converting the val Sue of the corrected count (C) into a corresponding value of the density (D) of the multiphase fluid (F) for the first time period (5) through a predefined function.