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Development Of Breakthrough Time Correlations For Coning In Bottom Water Supported Reservoirs
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STABLE CONE:
If a
well is produced at a constant rate and the pressure gradient in the
drainage system have constant, a steady state condition is reached, if
at this condition, the dynamic forces (viscous forces) at the well are
less than the gravity forces then the water or gas cone that has formed
will not extend to the well .Moreover, the cone will not advance nor
recede, thus establishing what is known as stable cone.
UNSTABLE CONE:
Conversely,
if the pressure in the system is in an unsteady-state condition, then
the cone that will be formed is unstable and it will continue to advance
until the steady-state condition takes over. If the flowing pressure
drop is sufficient to overcome the gravity forces, the unstable cone
will mushroom and ultimately break into the well. In actual sense
therefore, stable cones may only be 'pseudo-stable' because the drainage
system and the pressure distribution generally change. For a example,
during reservoir depletion, the water- oil contact may advance toward
the completion interval, thereby increasing coning tendencies. Another
one is reduction in productivity due to well damage requires a
corresponding increase in the flowing pressure drop to maintain a given
production rate. This increase in pressure drop may force an otherwise
stable cone into the well.
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ABSRACT - [ Total Page(s): 1 ]This research work mainly investigates the development and the behavior of cones (both water and gas cones) in oil reservoirs supported by strong aquifer, and from which analytical correlations are developed for quick engineering estimates of the time for water/gas cones to break into the perforations of the producing wells. The studies treated the cone development and breakthrough times in both horizontal and vertical well producing reservoirs and made analysis on them. The Ozkan and Raghavan ( ... Continue reading---
