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

Abstract

For the development o f oil reservoir with bottom water, it is sig nificant to analyze the impact o f 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 and the influence o f changing drawdown pressures in different water cut stage have been dis cussed. The results show that for thin oil with relatively high vis cosity (87.8 mPa.s), keeping a relatively large drawdown pressure in medium and low water cut stage is reasonable. But enlarging drawdown pressure in high water cut stage is harmful to increase ultimate oil recovery. For oil with further lower viscosity (21.4 mPa.s), adopting a small drawdown pressure and increasing it in medium and high water cut stage is reasonable. For the heavy oil (124.1 mPa.s), it is acceptable to enlarge drawdown pressure under the condition o f low water cut period.

Regulation of the process of additional development of the oil deposit of the Khankalskoye field and analysis of the control of indicators

“…The field development control shall be carried out on the basis of reliable information about the formation and its saturating fluids, dynamics of formation and bottom-hole pressure change, initial and current position of water-oil contact (WOC), technical condition of the used well stock, etc. [2] 2. Methods and materials Hydrodynamic studies of oil and gas wells and obtaining the necessary information require a systematic complex of field and laboratory studies.…”