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Conclusions
1. The concept of gravity separation has been
well accepted and the initial results of such systems look very
promising. Case histories have shown water production to surface
with dual rod pump gravity separation (DPGS) systems has been
reduced by 76-87%.
2. It is apparent however that the conditions under which this
technology is applied needs to be carefully considered. A detailed
candidate selection and evaluation program has been set up with
this in mind.
3. An accurate Inflow Performance Relationship is necessary. Pump
sizing and system performance evaluation is based on this. Often
times a DPGS system will produce much more total fluid out of
the reservoir than a conventional pumping system.
4. A good understanding of the disposal zone and its long term
reaction is required. An injectivity index of 0.01 m3/day/kPa
is considered a minimum. Step rate injectivity tests at around
the pump disposal rate are recommended.
Acknowledgments
The authors would like to thank their respective
companies for allowing them the time and latitude to write this
paper. Special thanks to Renaissance Energy for their commitment
and support of these systems and for allowing the presentation
of specific well data. The continuing pursuit of downhole separation
technology by Canadian research groups and oil producers is also
greatly appreciated.
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