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Development Of Breakthrough Time Correlations For Coning In Bottom Water Supported Reservoirs
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CHAPTER ONE
1.1INTRODUCTION
Coning is the mechanism describing the
movement of water/gas into the perforations of producing wells. For
water coning the movement is upwards for the case of bottom water, side
wards for edge water, but it is downwards for gas coning. The production
of water from oil wells is a common occurrence which increases the cost
of producing operations and may reduce the efficiency of the depletion
mechanism and the recovery of reserves. The objective of this research
work is to model the behaviour of this coning(mainly water coning, from
bottom water) and then use it to evaluate the time it would take a cone
to break into the producing well in reservoir of well-defined boundary
conditions.
The coning of water into production wells is caused by
pressure gradients established around the wellbore by the production of
fluids from the well. These pressure gradients can raise the water-oil
contact near the well where the gradients are dominant. The gravity
forces that arise from fluid density differences counterbalance the
flowing pressure gradients and tend to keep the water out of the oil
zone. Hence, at any given time, there is a balance between the
gravitational and the viscous forces at any point on and away from the
completion interval. The water cone formed will break eventually into
the well to produce water along with the oil when the viscous forces
exceed that of the gravitational forces. This basic visualization of
coning can be expanded further by introduction of the concept of stable
cone, unstable cone and critical production rate.
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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---
