Open Access

ARTICLE

Experimental Study of Reasonable Drawdown Pressure of Horizontal Wells in Oil Reservoir with Bottom Water

by

1 China University of Petroleum, Beijing, China.
2 No.1 oil production plant of Huabei Oil Field.
3 China University of Petroleum, Beijing, China.

Structural Longevity 2013, 9(2), 87-103. https://doi.org/10.3970/sl.2013.009.087

Abstract

The development effect of horizontal well in oil reservoir with bottom water is extremely sensitive to drawdown pressures. Since water coning is inevitable, it is significant to analyze the impact of drawdown pressures on post water breakthrough performance of horizontal wells. Based on a small-scale and discretized physical simulation system, the impact of different drawdown pressures, as well as the influence of changing drawdown pressures in different water cut stage, on the following indexes is discussed: increasing rates of water cut, oil recovery difference and displacing efficiency of bottom water. The results show that under different drawdown pressure, the variation curve between water cut and recovery degree tends to convex. For the thin oil with relatively high viscosity, it is reasonable to keep relatively large drawdown pressure to decrease water cut increase rate in medium and low water cut stage. But enlarging drawdown pressure in medium and high water cut stage is harmful to increase ultimate oil recovery. If the viscosity is further lower, it is beneficial to adopt small drawdown pressure to extend oil production period with low water cut content. While it is reasonable to increase drawdown pressure in medium and high water cut stage to improve the flooding efficiency of bottom water. For the heavy oil, it is acceptable to enlarge drawdown pressure under the condition of low water cut period.

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Keywords

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