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Research Papers: Petroleum Engineering

A Semi-Analytical Model for Predicting Horizontal Well Performances in Fractured Gas Reservoirs With Bottom-Water and Different Fracture Intensities

[+] Author and Article Information
Yongsheng Tan, Haitao Li, Beibei Jiang, Yongqing Wang, Nan Zhang

State Key Laboratory of Oil and Gas Reservoir
Geology and Exploitation,
Southwest Petroleum University,
Chengdu 610500, China

Xiang Zhou

Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Saskatchewan S4S 0A2, Canada

1Corresponding authors.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 3, 2017; final manuscript received May 3, 2018; published online May 29, 2018. Assoc. Editor: Ray (Zhenhua) Rui.

J. Energy Resour. Technol 140(10), 102905 (May 29, 2018) (11 pages) Paper No: JERT-17-1260; doi: 10.1115/1.4040201 History: Received June 03, 2017; Revised May 03, 2018

Numerical simulation and prediction studies on horizontal well performances in gas reservoir are foundation for optimizing horizontal well completion process. To gain more understanding on this theory, a steady-state reservoir model coupling with wellbore is developed in the fractured gas reservoirs with bottom-water and different fracture intensities to predict the horizontal well performances. Based on the equivalent flow assumption, the fractured porous medium is transformed into anisotropic porous medium so that the gas reservoir flow model can be developed as a new model that incorporates formation permeability heterogeneity, reservoir anisotropy, and gas reservoir damage. The wellbore flow model which considers pressure drops in the tubing is applied. We compare this paper model solutions for inflow profile along the well to the numerical solutions obtained from a commercial simulator (ECLIPSE 2011), and the result shows a very good agreement. Moreover, sensitive analysis, in terms of various linear densities of fractures, matrix permeability, fracture width, and wellbore pressure drop, is implemented. The results show that the new model developed in this study can obtain a more practical representation to simulate the horizontal wells performance in fractured gas reservoir with different fracture intensities and bottom-water, thus can be used to optimize the parameters in horizontal well completion of fractured gas reservoirs with different fracture intensities and bottom-water.

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Figures

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Fig. 1

Horizontal well inflow model for heterogeneous fractured gas reservoirs

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Fig. 2

Schematic of the horizontal well locates in fractured gas reservoirs with different fracture intensities and bottom-water

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Fig. 3

Discrete grid schematic diagram of horizontal well

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Fig. 4

The process of solving the coupling model

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Fig. 5

Fracture densities along horizontal wellbore

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Fig. 6

Comparison of inflow profiles between this paper model and Eclipse

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Fig. 7

Fracture densities along horizontal wellbore

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Fig. 8

Flux along the well for various linear densities of fractures

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Fig. 9

Flux along the well for different fracture widths

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Fig. 10

Flux along the well for different matrix permeabilities

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Fig. 11

Inflow rate and cumulative pipe flow rate along the horizontal well

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Fig. 12

Wellbore pressure drop of each segment and cumulative pressure drop

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