With a growing number of ageing wells, multi-string corrosion logging becomes an important aspect of proactive well integrity diagnostics. Corrosion log, done with a pulsed electromagnetic tool (EMDS) enables thru-tubing corrosion monitoring of the well tubulars in a single run. Corrosion log can be performed during standalone operations with a tubing being in place and should be particularly run […]
Annuli B and C failed leak off test. Oil producer. Objective of the job involved detection of corroded zones with a subsequent determination of the water path during injection. During the run in hole, real-time corrosion logging tool (EMDS) detected the zones with highly corroded intervals, that helped narrow the search of leak points with spectral noise tool. The objective was achieved […]
Sequence of log: 1. One down/up shut in pass with speed 16.5m/min 2. Two injection down/up passes with speed 8m/min) across zone of interest. On the left side of the plot are: 2 curves which are recorded under shut in condition and 4 curves are recorded under injection condition. On the right side of the plot is the average velocity […]
The main objective of running an EMDS log in this well was to identify the location of leak path in the 7.00” scab liner (log done during hoist intervention after 7.00” scab liner pressure test failure). The well completion design across the logging interval was 7.00” scab liner, 9 5/8” casing and 13 3/8” casing. The Log result showed […]
The EMDS log was run to identify the mechanical condition of 7.00” tubing, 9 5/8” & 13 3/8” casing (gas producer). Log results clearly showed that the 13 3/8” casing has a large interval of minor/extensive corrosion which has affected 9 5/8” casing, initiation for outside moving inwards. Both casings therefore have two zones of extensive corrosion.
To identify technical condition of 3.5” tubing, 7.00” & 9 5/8” casing the EMDS log was conducted in this well. The log result showed: 9 5/8” casing has large zones of extensive/moderate/minor corrosion extending into formation of a few holes. The shape of the temperature curve gives a clear indication of an upward cross flow (upper and lower positive anomalies […]