Objective
To develop drainage systems for the recovery of heavy oils.
The hypothetical data used so far, the new model has demonstrated :
1 - that for a vertical well with a flow of 250 m3/j. The oil recovery
Following water breakthrough represents 60% of that prior to
breakthrough.
2 - that these results remain unchanged when the flow of the vertical well
Drops to 50 m3/j, (the flow has no effect on the evolution of the wor,
At least as long as one remains in hypercritical range).
3 - that for a horizontal well 500 m long with a flow of 250 m3/j, the
Recovery after water breakthrough is only 13% of that before
breakthrough.
4 - that the relative gain in production of the horizontal well compared to
The vertical well is 5 to 1 at water breakthrough, is only 3.6 to 1 for
A wor of 3.
These results therefore tend to reduce the interest in horizontal wells, though without eleminating them thereby.
In view of the low hope of success that we ascribe to the other methods envisaged (co2 injection, steam injection, or injection of gelling solutions) and the remarkable results recently obtained in horizontal drilling technology (see the lacq 90 experiment), we consider that the horizontal well method offers the most attractive line of research for combating water ingress and enhancing recovery on the rospo mare field.
To conclude this study, we recommend that a horizontal well be attempted from the production test platform to be set up on the rospo mare structure in 1981.
Following the decision taken during the first half of 1980 to carry out a long term production test on the rospo mare field, and without waiting for the results of this test, studies and research on drainage methods were partially interrupted. The only current activity during the second half of 1980 consisted in resuming some of the 1979 mathematical simulations by means of a new implicit resolution model in order to explore the post-breakthrough production period, which was not possible with the former model owing to numerical instability.
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Programme(s)
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Coordinator
00165 Ivia Aurelia Roma
Italy
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