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Corrosion is probably the main cause of loss of integrity in downhole tubulars and can lead to large unexpected costs and potentially hazardous situations. By using READ's range of multifinger calliper tools combined with many years of data processing and interpretation experience READ can offer a proven and highly accurate corrosion detection and monitoring service.
Traditionally tubular inspection data has been difficult to comprehend due to the large volumes of data involved and limited presentation options. In order to overcome these difficulties READ presents the final processed data on a CDROM with simple PC based log-viewing programme. This programme allows the data to be presented in a number of different ways (including 3D) so the internal profile of any metal loss feature can be fully understood, hence making the determination of its cause simpler.
READ's reporting structure typically includes a single A4 plot showing the maximum percentage penetration in each joint in the survey interval. This plot is part of a spreadsheet supplied with the processed data, which allows the most important values from the survey to be easily transferred to other software applications if required. In addition our interpretation reduces the need to look through thousands of feet of data by highlighting the potential problem areas.
As well as being able to accurately quantify metal loss in downhole tubulars the same methods can also be applied to a number of other potential downhole problems. Most common among these is the build up of scale deposits inside the tubulars with the potential to limit production and prevent access for future well interventions.
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Time-lapse monitoring
The use of multiple surveys in the same well over time allows the rate of deterioration in tubular condition to be assessed. The introduction of time as a variable gives a number of advantages over the use of a single survey, most notable among these is the ability to plan for the future of the well. In addition the effects of changes in the downhole environment (e.g. increased water cut, use of inhibitors etc.) on the tubing condition can be analysed and the lessons learnt applied to other wells in the field.
