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Increased recovery from the Lower Cretaceous

The Valdemar Field produces first class oil but “tricky” chalk makes oil recovery a challenging exercise. Now a research group at DHRTC hopes to find new ways to recover the oil.

Two of the researchers working in the new programme, Tight Reservoir Development, are Jon Ineson and Morten Bjerager. Both are Senior Research Geologist from Geological Survey of Denmark and Greenland (GEUS). The new programme in Danish Hydrocarbon Research and Technology Centre consists of 12 work packages; Morten and Jon hope to be able to create a robust stratigraphy that help the others in the programme to fulfill their parts in the large-scale enterprise.

DHRTC's hypothesis

During 2017, the Lower Cretaceous research programme launched with the aim of increasing recovery from Lower Cretaceous reservoirs. welve research projects are ongoing to improve the understanding of this challenging and under-developed reservoir.

The challenge with the Lower Cretaceous is that the presence of clay results in ultra low permeability of the chalk reservoirs. The research programme focuses on obtaining a better fundamental understanding of the reservoirs and on screening of methods, which may improve the recovery of oil and gas.

DHRTC HYPOTHESIS
  • Natural and induced fractures can increase productivity, compaction and sweep in the Lower Cretaceous
  • Reservoir Quality distribution can increase productivity and improve OIIP estimates
  • Compaction/subsidence is an important contributor to drive mechanism
  • Gas Injection can help produce longer and more
  • Water Injection can reduce remaining oil through enhanced sweep as well as enhance the compaction drive
DHRTC RESEARCH:
  • Dynamic reservoir models demonstrating the possible improvement of recovery from the Lower Cretaceous reservoir by gas injection
  • Feasibility study showing if there is an economical potential for water injection
  • Geo-mechanical modeling
  • Field scale fracture modeling
  • OOIP models based on new spatial understanding of the reservoir quality