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DTU Olie og Gas
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10 dhrtc 2016 advanced water flooding how is it possible to recover more oil from the
chalk
in the north sea? this is the key question in dhrtc?s research programme advanced water flooding (awf). the
ekofisk
and tor
chalk
formation
s have for many years played a central role for dan- ish oil recovery, as they still contain signifi- cant oil and gas volumes. the research pro- gramme advanced water flooding is focused on developing new methods for recovering a larger share of oil. one of the challenges is to increase the sweep efficiency in the upper- most oil-bearing
chalk
stratum, the
ekofisk
formation
, to the same high level as in the underlying tor
formation
. the challenges are due to the properties of the
chalk
. the porosity of the
chalk
in the
ekofisk
formation
is the same as that of the tor
formation
, but it is less permeable. the reason for this is that the
ekofisk
formation
was formed by unicellular planktonic
chalk
algae, cocco- lithophores, approx. 60 million years ago, and these coccolithophores are smaller than the ones that built up the tor
formation
approx. 70 million years ago. in
ekofisk
, the research focuses on: ? learning more about the properties of
chalk
? the possibility of using fracturing ? small cracks in the
chalk
to increase recovery ? new methods for forcing the oil out by injecting water, chemicals, or bacteria ? enhanced oil recovery. in the tor
formation
, the challenge is finding technological solutions that enable more oil to be recovered from deep, compact
chalk
strata. the research focuses on: ? the possibility of using hydraulic fracturing ? the development of new drilling and fracturing tools and new applications for existing tools for both the
ekofisk
and tor
formation
s, computer simulations and models are being developed and the most promising methods could be selected for testing in the north sea. photo: joachim rode increased recovery from the
ekofisk
and tor
formation
s core samples cut out of the drill cores, which have been removed from the rock in connection with the drilling of wells.
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