WAG-CO2 EOR Horizontal Wells Pilot Surveillance at a Giant Abu Dhabi Oil Field: First-of-a-Kind 3D Monitoring Plan Using DeepLook Electromagnetics (DLEM) | Schlumberger
Tech Paper
Location
United Arab Emirates, Asia
Society
Other Industry Society
Paper Number
2013 ADIPEC 705
Presentation Date
2013
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WAG-CO2 EOR Horizontal Wells Pilot Surveillance at a Giant Abu Dhabi Oil Field: First-of-a-Kind 3D Monitoring Plan Using DeepLook Electromagnetics (DLEM)

Abstract

DeepLook Electromagnetics (DLEM) crosswell resistivity technique has proven its value as new reservoir‐scale surveillance method in many EOR projects. However, its application in WAG‐CO2 injection and deployment in horizontal wells has not been fully assessed yet. The development of 3D inversion and improved reservoir understanding in WAG-CO2 EOR processes were trigger for first study and survey design for pilot located in ADCO’s giant oil field in transitional zone. Wells drilled there have confirmed that there is considerable oil in place. Hence pattern‐based, local EOR flooding pilot including program of 6 months long alternating WAG‐CO2 injection cycles have been proposed. A horizontal line-drive pilot with one horizontal producer emplaced in middle between two horizontal injectors plus three vertical observation wells are planned for pilot in near future. The main objective of this pilot is assessment of CO2 EOR potential in this area of field. In this paper we discuss DLEM detailed modeling and field survey design results.

The modeling study results indicated that DLEM method is suitable for tracking both CO2 and water flooding; it showed sufficient sensitivity to distinguish between fluid volumes and proved that inverted images are good approximation of modeled saturation volumes. Under watered out conditions and/or when CO2 injected after water cycle, DLEM technique has good sensitivity to CO2 phase. 2D and 3D modeling is applied to vertical‐vertical, horizontal‐vertical, and horizontal‐horizontal well pairs to ensure modeling the whole volume of reservoir between the wells.

Both modeling and survey design for the pilot using recent 3D inversion algorithms, together with improved understanding of WAG‐CO2 impact on reservoir resistivity distribution, indicated that time‐lapse DLEM inter‐well saturations provide useful monitoring data of the injected fluids; water and CO2 fronts. Finally this data can be utilized to calibrate the dynamic simulation models for more robust history matching enhancing the overall evaluation of EOR pilot.

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