Method for analyzing cement integrity in casing strings ­using machine learning

(22) 18.05.2016

(43) 24.11.2016

(57) The present disclosure provides methods and systems for analyzing cement integrity in a depth interval of a wellbore having a multiple string casing with an innermost annulus disposed inside at least one outer annulus. The method includes processing ultrasonic data obtained from ultrasonic measurements on the interval of the wellbore to determine properties of the innermost annulus. The method also includes processing sonic data obtained from sonic measurements on the interval of the wellbore to extract features of the sonic data. The features of the sonic data are input to a machine learning processing to determine properties of both the innermost annulus and the least one outer annulus. Additional processing of ultrasonic and sonic data can also be used to determine properties of both the innermost annulus and the least one outer annulus. These properties can be used to analyze cement integrity in the depth interval of the wellbore.

(71) (for US only) Schlumberger Technology Corporation, 300 Schlumberger Drive, Sugar Land, Texas 77478 (US)

(71) (for CA only) Schlumberger Canada Limited, 125 – 9 Avenue SE, Calgary, ­Alberta T2G OP6 (CA)

(71) (for FR only) Services Petroliers Schlumberger, 42 rue Saint Dominique, 75007 Paris (FR)

(71) (for all designated States except CA, FR, US) Schlumberger Technology B.V., Parkstraat 83-89, NL-2514 JG The Hague (NL)

(84) ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)