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Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model

1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
2
CNPC Chuanqing Drilling Engineering Company Limited, Chengdu 610500, China
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(22), 5952; https://doi.org/10.3390/en13225952
Received: 23 September 2020 / Revised: 30 October 2020 / Accepted: 12 November 2020 / Published: 14 November 2020
It is commonly believed that matrix and natural fractures randomly distribute in carbonate gas reservoirs. In order to increase the effective connected area to the storage space as much as possible, highly deviated wells are widely used for development. Although there have been some studies on the composite model for highly deviated wells, they have not considered the effects of stress sensitivity and threshold pressure gradient in a dual-porosity gas reservoir. In this paper, a semi-analytical composite model for low permeability carbonate gas reservoir was established to study the effect of non-Darcy flow. By employing source function, Fourier transform and the perturbation method, the pressure performance and typical well test curves were obtained. Eight flow regimes were identified, and their characteristics were discussed. As a result, it can be concluded that the effects of stress sensitivity and threshold pressure gradient would make pseudo-pressure and derivative curves rise, which is the characteristic of non-Darcy flow to determine whether there is stress sensitivity or threshold pressure gradient. View Full-Text
Keywords: carbonate gas reservoir; stress sensitivity; threshold pressure gradient; composite model; pressure performance carbonate gas reservoir; stress sensitivity; threshold pressure gradient; composite model; pressure performance
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MDPI and ACS Style

Zhang, Q.; Zhang, L.; Liu, Q.; Jiang, Y. Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model. Energies 2020, 13, 5952. https://doi.org/10.3390/en13225952

AMA Style

Zhang Q, Zhang L, Liu Q, Jiang Y. Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model. Energies. 2020; 13(22):5952. https://doi.org/10.3390/en13225952

Chicago/Turabian Style

Zhang, Qinwen; Zhang, Liehui; Liu, Qiguo; Jiang, Youshi. 2020. "Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model" Energies 13, no. 22: 5952. https://doi.org/10.3390/en13225952

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