Microscopic oil displacement mechanism of nature gas flooding in high-pressure and low-permeability reservoirs

doi:10.13673/j.cnki.cn37-1359/te.2020.01.009

Home > Archive>Volume 27, Issue 1, 2020 >62-68. DOI:10.13673/j.cnki.cn37-1359/te.2020.01.009

Microscopic oil displacement mechanism of nature gas flooding in high-pressure and low-permeability reservoirs
DOI:
                        10.13673/j.cnki.cn37-1359/te.2020.01.009
                    
Author:
                        CUI MaoleiCUI Maolei
1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development，Beijing City，100083， China；2.Key Laboratory of Marine Oil and Gas Reservoir Production，SINOPEC，Beijing City，100083，China； 3.Petroleum Exploration and Development Research Institute，SINOPEC，Beijing City，100083，China
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WANG RuiWANG Rui
1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development，Beijing City，100083， China；2.Key Laboratory of Marine Oil and Gas Reservoir Production，SINOPEC，Beijing City，100083，China； 3.Petroleum Exploration and Development Research Institute，SINOPEC，Beijing City，100083，China
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Lü ChengyuanLü Chengyuan
1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development，Beijing City，100083， China；2.Key Laboratory of Marine Oil and Gas Reservoir Production，SINOPEC，Beijing City，100083，China； 3.Petroleum Exploration and Development Research Institute，SINOPEC，Beijing City，100083，China
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LUN ZengminLUN Zengmin
1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development，Beijing City，100083， China；2.Key Laboratory of Marine Oil and Gas Reservoir Production，SINOPEC，Beijing City，100083，China； 3.Petroleum Exploration and Development Research Institute，SINOPEC，Beijing City，100083，China
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ZHAO ShuxiaZHAO Shuxia
1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development，Beijing City，100083， China；2.Key Laboratory of Marine Oil and Gas Reservoir Production，SINOPEC，Beijing City，100083，China； 3.Petroleum Exploration and Development Research Institute，SINOPEC，Beijing City，100083，China
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TANG YongqiangTANG Yongqiang
1.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development，Beijing City，100083， China；2.Key Laboratory of Marine Oil and Gas Reservoir Production，SINOPEC，Beijing City，100083，China； 3.Petroleum Exploration and Development Research Institute，SINOPEC，Beijing City，100083，China
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Clc Number:TE357.7
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Abstract:

After depleted production of high-pressure and low-permeability reservoirs，the formation energy is insufficient，which leads to the increase of gas production because of oil degassing. Therefore it is feasible to reinject the produced gas from economical and technical aspects. In order to clarify the microscopic oil displacement mechanism of reinjected natural gas flooding after the depleted production of this kind of reservoir，the factors influencing natural gas flooding is analyzed under high-temperature and high-pressure conditions so as to reveal the influence of depleted production and water flooding on natural gas flooding effect. Using self-developed high-temperature and high-pressure micro-visualization device，the microscopic gas displacement experiments under various conditions are carried out on the glass-etched porous medium simulation model. The results indicate that natural gas flooding can reduce the Jamin effect caused by degassing of oil during depleted production.Under the target reservoir conditions，the gas flooding mechanism is dominated by displacement，and the dissolution extraction is supplemented. Water barrier prevents the contact between gas and oil.In unswept area of natural gas，the residual oil is difficult to be produced because of water barrier，in swept area，natural gas can peel off water film gradually to contact with oil，and displace oil by dissolution and extraction. Natural gas flooding in high-pressure and low-permeability reservoirs can further enhance oil recovery after depleted production.

Key words:high-pressure and low-permeability;depleted production;natural gas flooding;visualization experiment;microscopic oil displacement mechanism

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CUI Maolei, WANG Rui, Lü Chengyuan, LUN Zengmin, ZHAO Shuxia, TANG Yongqiang. Microscopic oil displacement mechanism of nature gas flooding in high-pressure and low-permeability reservoirs[J]. Petroleum Geology and Recovery Efficiency,2020,27(1):62~68

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Online: April 14,2020
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