Summary
Several multirate separator tests (MRTs) have been undertaken on wells in
the Veslefrikk field that are on commingled production from the Brent Group and
Intra Dunlin Sand. During these tests, produced-water samples were also
collected. Integrated analysis of the results of interpretion of the
produced-water analyses and the MRT results have provided a range of
information for each production zone including the nature and composition of
the produced water, seawater fraction of these produced waters, fraction of
total water flow being produced, pressure, productivity index, oil and water
rates, and water cut. This information can reduce the need for deploying
production-logging tools (PLTs), allows the scaling potential between the
deeper and the shallower zones to be evaluated, aids squeeze-treatment design,
is beneficial for predicting formation damage from crossflow, and aids
water-shutoff decisions.
In this paper, the methods of interpreting the produced-water analyses are
presented through the use of a field example. To aid interpretation,
interpretation of other produced-water analyses from the field and
reactive-transport modeling have been undertaken to better understand reactions
occurring in the reservoir as a result of seawater injection and the effects of
these reactions on produced-water compositions. In an accompanying paper
(Tjomsland et al. 2011), the integrated MRT-analysis techniques are described
and the results and applications of additional field examples are
presented.
© 2011. Society of Petroleum Engineers
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History
- Original manuscript received:
6 June 2010
- Meeting paper published:
27 May 2010
- Revised manuscript received:
7 January 2011
- Manuscript approved:
2 April 2011
- Published online:
27 July 2011
- Version of record:
1 May 2012
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