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Technical Brief

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

[+] Author and Article Information
Chuan Lu

Department of Petroleum Engineering,
China University of Petroleum-Beijing,
Beijing, Changping 102249, China
e-mail: luchuan2106@163.com

Huiqing Liu

Department of Petroleum Engineering,
China University of Petroleum-Beijing,
Beijing, Changping 102249, China
e-mail: liuhq@cup.edu.cn

Qiang Zheng

Research Institute of China National
Offshore Oil Corporation,
Beijing, Dongcheng 100027, China
e-mail: zqcup2010@126.com

Qingbang Meng

Department of Petroleum Engineering,
China University of Petroleum-Beijing,
Beijing, Changping 102249, China
e-mail: mengqingbang@126.com

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 11, 2013; final manuscript received March 28, 2014; published online May 2, 2014. Assoc. Editor: W. David Constant.

J. Energy Resour. Technol 136(3), 034502 (May 02, 2014) (5 pages) Paper No: JERT-13-1320; doi: 10.1115/1.4027405 History: Received November 11, 2013; Revised March 28, 2014

For the development of oil reservoir with bottom water, 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 and the influence of changing drawdown pressures in different water cut stage have been discussed. The results show that for thin oil with relatively high viscosity (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 of low water cut period.

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Figures

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Fig. 1

The apparatus diagram of the simulation system

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Fig. 2

Water-cut raise curves of two oil viscosities under different drawdown pressures

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Fig. 3

The difference of single sand-pack recovery degree under different drawdown pressures (G: Gini coefficient, R: Recovery degree)

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Fig. 4

The effort of changing drawdown pressures on the variation of cumulative water-oil and recovery at different water cut

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Fig. 5

Water driving effective coefficient versus water cut at altering drawdown pressure

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