Application of Downhole Flowmeters to Workover Operations on Geothermal Wells

Abstract

The downhole flowmeter logging system for high temperature geothermal wells, developed at Wairakei by Ministry of Works Development and Geophysics Division of D.S.I.R., has proved to be an invaluable tool for use during workovers to repair or r e in state problem wells. In addition to identifying the exact nature and location of certain common problems, such as natural cool downflows, the can be used to effectively caliper the hole so that drillable cementers can be properly located, and then used to manage cementing operations designed to block cool infiow zones. For some of these investigations a very simple flow indicator which can be run on a regular single-strand wireline has been tested. Results to date indicate that if operated carefully, useful results can be obtained by this method for a minimal financial outlay.