Improving the Efficiency of H2S Mitigation in Middle East Oil and Gas Fields
- A. Hofmann (SGS) | W. van Strien (SGS) | R. Malekzadeh (SGS)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Exhibition & Conference, 13-16 November , Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Petroleum Engineers
- 4.1 Processing Systems and Design, 4.2 Pipelines, Flowlines and Risers, 5.4 Improved and Enhanced Recovery, 2.1.3 Completion Equipment, 5.5 Reservoir Simulation, 5.5.8 History Matching, 4 Facilities Design, Construction and Operation, 5.4 Improved and Enhanced Recovery, 4.1.2 Separation and Treating, 5 Reservoir Desciption & Dynamics
- Origin of H2S, H2S Mitigation, EOR, Field Souring, DNA Analysis
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More than 60% of gas reserves in the Middle East region are regarded as sour. The development of sour oil and sour gas fields or originally sweet oil fields, which undergo a souring process during production live, impose significant investments for the H2S treatment and increase significantly the field operation costs. In order to evaluate the origin and development of the H2S in a production system multiple locations covering all process stations such as down hole, well head, separators, gathering stations, pipelines have to be sampled an analysed. The in-field measurements of the H2S concentrations and various laboratory analyses like S34 / S32 isotope ratio, CSIA, DNA sequencing, MPN and Bacterial growth tests could be performed in order to provide a conclusive picture of the H2S contamination.
The most promising and cost efficient technology is the analysis of the bacterial activity using DNA analysis and bacterial growth tests. The integration and interpretation of all above mentioned analysis types is key for the evaluation of the origin and development of the field souring process and provides a robust analytical basis for remediation, scavenging and mitigation operations. In combination with modern dynamic reservoir modeling tools, which allow the history match and forecast of the field souring process, the efficiency of mitigation or scavenging operations in the subsurface and at the surface can be simulated and optimized.
In context with the envisaged production enhancement, the application of EOR technologies and the souring of several reservoirs due to injection, the monitoring and handling of additional H2S production become an important environmental and economic factor.
|File Size||1 MB||Number of Pages||13|