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Research Papers

Mathematical Modeling of Heat Transfer and Pressure Drops in the Single- and Dual-Pipe Horizontal Wells

[+] Author and Article Information
Xiaohu Dong

MOE Key Laboratory of Petroleum Engineering,
China University of Petroleum,
Beijing 102249, China
e-mail: donghu820@163.com

Huiqing Liu

MOE Key Laboratory of Petroleum Engineering,
China University of Petroleum,
Beijing 102249, China
e-mail: liuhq110@126.com

Zhangxin Chen

Department of Chemical and
Petroleum Engineering,
University of Calgary,
Calgary, AB T2N 1N4, Canada
e-mail: zhachen@ucalgary.ca

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 12, 2016; final manuscript received September 11, 2016; published online November 16, 2016. Assoc. Editor: Amir Jokar.

J. Thermal Sci. Eng. Appl 9(1), 011016 (Nov 16, 2016) (10 pages) Paper No: TSEA-16-1125; doi: 10.1115/1.4034916 History: Received May 12, 2016; Revised September 11, 2016

In this paper, from the heat transfer mechanisms between perforated horizontal well and formation, the mathematical models for the heat transfer and pressure drops of the horizontal well with different steam injection pipe configurations are developed. All the conventional single-pipe, concentric dual-pipe, and parallel dual-pipe configurations are considered. A correlation is proposed to represent a relationship between the thermophysical properties of the formation and the formation pressure and temperature. Then, using the method of wellbore microcontrol elements and node analysis, the steam injection process in the three different well configurations is numerically investigated. Based on the test data of a parallel dual-pipe horizontal well from an actual oilfield, a steam backflow procedure for the parallel dual-pipe configuration is proposed to confirm the sealed status of a thermal packer. The theoretical investigation plays an important role in the performance evaluation and productivity prediction of horizontal well-based thermal recovery projects. Furthermore, it also sheds some important insights on a steam injection project design with dual-pipe horizontal wells.

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References

Figures

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Fig. 1

Temperature test results of a thermal horizontal well in Liaohe oilfield [10]

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Fig. 2

A schematic diagram of three commonly used steam injection well configurations (a) configuration 1—single pipe, (b) configuration 2—concentric dual pipe, and (c) configuration 3—parallel dual pipe

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Fig. 3

The schematic diagram of wellbore microcontrol elements

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Fig. 7

Simulation results of three steam injection pipe configurations

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Fig. 8

Simulation results of concentric configuration (a) fluid pressure along the wellbore and (b) heat loss rate

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Fig. 9

Simulation results of parallel configuration (a) pressure along the wellbore and (b) heat loss rate

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Fig. 10

Simulation results of the three configuration at different injection rates (a) heat loss rate and (b) pipe-end pressure. For configurations 2 and 3, the injection rate in curves refers to the steam injection rate of long pipe, and the injection rate of short pipe is 120 tons/day.

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Fig. 11

Simulation results of the three configurations at different injection pressures (a) heat loss rate and (b) pipe-end pressure

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Fig. 12

Simulation results of the three configurations at different injection times (a) heat loss rate and (b) pipe-end pressure

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Fig. 13

Parallel dual-pipe configuration in Chong 32 block of Xinjiang oilfield

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Fig. 14

The pressure changes of test process in the FHW161 well

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Fig. 15

Checking curves of sealed state of a packer in the horizontal segment

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