Proceedings of the 6th New Zealand Geothermal Workshop 1985. Determination of casing condition using mechanical and electric logs. New Zealand Geothermal Workshop [7-9 Nov. 1984, New Zealand].

Bixley, P.F.

[1984]

CIENA
171

0-86869-056-2

Recent work in several New Zealand geothermal fields has shown severe casing deterioration on wells only 12-15 years old. Casings have been examinated using Otis casing caliper, Kinley microscopic caliper, Schlumberger ETT-A (Electromagnetic Thickness tool) and CBL-VD (Cement Bond) logs, flow logs and pressure tested using casing packers. Analysis of the corrosion products indicates that attack commences at the outer surface, limiting the effectiveness of mechanical casing caliper techniques. The electromagnetic thickness tool has been successful in identifying zones of severe corrosion.

Presenta gráfs.

NUEVA ZELANDIA; ENERGIA GEOTERMICA; CAMPOS GEOTERMICOS; POZOS GEOTERMICOS; CORROSION;