Dukhan Field Multiwell Corrosion Study
- A.E. Sharshar (QGPC (Onshore Operations)) | R.L. Nutt (QGPC (Onshore Operations)) | P.M. Smith (Schlumberger) | P.A. Crossouard (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- Middle East Oil Show, 16-19 November, Bahrain
- Publication Date
- Document Type
- Conference Paper
- 1991. Society of Petroleum Engineers
- 2.2.2 Perforating, 6.5.2 Water use, produced water discharge and disposal, 2.4.3 Sand/Solids Control, 5.6.1 Open hole/cased hole log analysis, 4.3.4 Scale, 4.2.3 Materials and Corrosion, 5.4.1 Waterflooding, 5.1.5 Geologic Modeling, 2.7.1 Completion Fluids, 3.2.4 Acidising, 3 Production and Well Operations
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Multi-well Data base techniques greatly facilitate the storage, retrieval and manipulation of well log data.
This paper reviews a multi-well approach to the analysis of corrosion logging measurements across 50 wells in the Dukhan field.
The objective of the study was to understand corrosion phenomena throughout the field and to determine the phenomena throughout the field and to determine the relationships between corrosion in different wells.
Multi-well techniques to optimize the normalisation of logging tool responses to metal losses are described.
Dukhan field production/injection and corrosion problem history is reviewed followed by a description problem history is reviewed followed by a description of the basic Corrosion Evaluation logging tool measurements and their incorporation into the multi-well data base.
Results, both field wide and selected individual well, are presented and discussed. These results indicate that the presented and discussed. These results indicate that the most significant corrosive mechanism is inner wall erosion in the dump flood injection wells. However mild, outer wall metal loss is observed, in some cases, across the un-perforated aquifers suggesting the possibility of other corrosion phenomena which should possibility of other corrosion phenomena which should be monitored in future casing corrosion evaluation programs. programs
The measurement of casing metal loss due to corrosion is usually accomplished by electromagnetic logging sensors such as the Multi Pipe analysis Tool (MPAT) and the Multi-Frequency Electromagnetic Tool (METT).
This paper describes a multi-well evaluation project conducted in QGPC Onshore Operations Dukhan Field. The purpose of the study was to:
1. Ensure that log data was corrected for any environmental effects to quantify metal loss in each well in both single and multiple casing strings.
2. To incorporate the raw and corrected log data for each well, together with relevant well data such as well coordinates, formation tops and bottoms and perforation status into a multi-well data base.
3. Identify corrosion trends within the Dukhan field.
4. Understand the corrosion mechanisms occurring with a view to recommending procedures to extend casing life.
5. Optimize future corrosion logging programs.
Corrosion logging is recognized as an important potential contributor to the Petroleum Engineer's potential contributor to the Petroleum Engineer's understanding of field wide casing deterioration phenomena. phenomena. P. 257
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