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Research Papers: Natural Gas Technology

Process Design of Cyclic Water Flooding by Real-Time Monitoring

[+] Author and Article Information
Kobra Pourabdollah

Department of Petroleum Engineering,
Chemistry and Chemical Engineering Research
Center of Iran,
P. O. Box 1496813151,
Tehran, Iran
e-mail: pourabdollah@ccerci.ac.ir

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 9, 2016; final manuscript received June 2, 2018; published online June 26, 2018. Assoc. Editor: Ray (Zhenhua) Rui.

J. Energy Resour. Technol 140(11), 112701 (Jun 26, 2018) (9 pages) Paper No: JERT-16-1287; doi: 10.1115/1.4040525 History: Received July 09, 2016; Revised June 02, 2018

The gradual decline in the oil production rate of water flooded reservoirs leads to decrease in the profit of water flooding system. Although cyclic water injection (CWI) was introduced to reduce the descending trend of oil production in water flooded reservoirs, it must be optimized based upon the process parameters. The objective of this study is to develop all process design criteria based upon the real-time monitoring of CWI process in a naturally fractured reservoir having five producing wells and five injector wells completed in an Arab carbonated formation containing light crude oil (API = 42 deg). For this aim, a small pilot oil field was selected with water injection facilities and naturally producing oil wells and all data were collected from the field tests. During a five years' field test, the primary observations at the onset of shutdown periods of the water injection system revealed a repeatable significant enhancement in oil production rate by a factor of plus 5% leading us to assess the application of CWI. This paper represents the significant parameters of pressure and productivity affected during CWI in naturally fractured carbonate reservoirs based upon a dual porosity generalized compositional model. The results hopefully introduce other oil producer companies to the potential of using CWI to increase oil production in conventional water injection systems. The results also outline situations where such applications would be desirable.

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Figures

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Fig. 1

Graphical representation of CWI process including: (a) wellhead pressure of oil producing well, (b) daily production rate, and (c) cumulative oil production

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Fig. 3

Graphical implementation of extra cumulative oil produced using cyclic water flooding process versus the conventional ones

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Fig. 2

Comparative illustration of both conventional and cyclic water flooding systems in terms of production rate versus time

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Fig. 5

Graphical presentation of the model cyclic water flooding concept in terms of two half-cycle of pressurizing and depressurizing

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Fig. 6

The pressure versus time traces of oil producing wells number X1–X5 after halting the water injection

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Fig. 7

The curve of overall oil production overlapped with six halting periods of water injection

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Fig. 4

Graphical implementation of Eq. (20)

Tables

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