Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model
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 c...
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| Format: | Article |
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MDPI AG
2020-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/22/5952 |
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| author | Qinwen Zhang Liehui Zhang Qiguo Liu Youshi Jiang |
| author_facet | Qinwen Zhang Liehui Zhang Qiguo Liu Youshi Jiang |
| author_sort | Qinwen Zhang |
| collection | DOAJ |
| description | 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. |
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| id | doaj.art-f4835816a26748ad802f6466d5631dc3 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T14:51:22Z |
| publishDate | 2020-11-01 |
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| series | Energies |
| spelling | doaj.art-f4835816a26748ad802f6466d5631dc32023-11-20T21:00:01ZengMDPI AGEnergies1996-10732020-11-011322595210.3390/en13225952Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite ModelQinwen Zhang0Liehui Zhang1Qiguo Liu2Youshi Jiang3State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaIt 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.https://www.mdpi.com/1996-1073/13/22/5952carbonate gas reservoirstress sensitivitythreshold pressure gradientcomposite modelpressure performance |
| spellingShingle | Qinwen Zhang Liehui Zhang Qiguo Liu Youshi Jiang Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model Energies carbonate gas reservoir stress sensitivity threshold pressure gradient composite model pressure performance |
| title | Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model |
| title_full | Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model |
| title_fullStr | Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model |
| title_full_unstemmed | Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model |
| title_short | Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model |
| title_sort | pressure performance of highly deviated well in low permeability carbonate gas reservoir using a composite model |
| topic | carbonate gas reservoir stress sensitivity threshold pressure gradient composite model pressure performance |
| url | https://www.mdpi.com/1996-1073/13/22/5952 |
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