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陈建勋,杨胜来,李佳峻,等. 低渗透砂岩气藏渗流特征及渗透率下限研究[J]. 科学技术与工程, 2020, 20(20): 8157-8162.
Chen Jianxun,Li Jiajun,et al.Study on Percolation Characteristics and Permeability Lower Limit of Low Permeability Sandstone Gas Reservoir[J].Science Technology and Engineering,2020,20(20):8157-8162.
低渗透砂岩气藏渗流特征及渗透率下限研究
Study on Percolation Characteristics and Permeability Lower Limit of Low Permeability Sandstone Gas Reservoir
投稿时间:2019-08-02  修订日期:2020-02-13
DOI:
中文关键词:  低渗气藏 孔隙结构 渗流特征 含水饱和度 渗透率下限
英文关键词:Low permeability gas reservoir Pore structure Flow characteristics Water saturation Lower permeability limit
基金项目:国家自然科学基金“超深层碎屑岩油气藏渗流物理基础研究”(51774300); 中石油重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用”(2016E-0605)。
                 
作者单位
陈建勋 中国石油大学(北京)
杨胜来 中国石油大学(北京)
李佳峻 中国石油大学(北京)
梅青燕 中国石油西南油气田分公司勘探开发研究院
周源 中国石油西南油气田分公司勘探开发研究院
邹成 中国石油大学(北京)
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中文摘要:
      针对川中须家河组低渗气藏含水饱和度高、气井单井产能低、稳产困难的现状,急需优化调整生产方案,提高产能。为此,通过CT扫描的方式分析不同类型储层的孔渗物性特征;其次,在地层条件下进行不同类型岩心的气-水两相、气相单相的渗流特征实验。研究表明,与孔隙度、孔喉半径相比,岩心类型对渗透率的影响程度更高;随着含水饱和度的提高,气相流动能力大幅降低;束缚水条件下,孔隙型岩心内的气相流动存在启动压力梯度,当生产压差低于16MPa时,气相流动处于低速非达西阶段,该压差下对应的渗透率下限为0.32 mD。实际生产过程中,可以通过控制含水饱和度、提高储层导流能力或是增大生产压差的方式提高气井产能。该研究为掌握低渗气藏的气相流动特征、优化调整生产方案具有借鉴意义。
英文摘要:
      The low permeability gas reservoir of Xujiahe Formation in central Sichuan is facing the situation of high water saturation, low single well productivity and difficulty in stabilizing production. It is urgent to optimize and adjust production plan to improve productivity. Therefore, the pore and permeability characteristics of different types of reservoirs are analyzed by CT scanning. Secondly, the gas-water two-phase and gas-phase single-phase percolation characteristics of different types of cores are experimented under formation conditions. The results show that the core type has a higher influence on permeability than porosity and pore throat radius; with the increase of water saturation, the gas flow ability decreases greatly; under the condition of irreducible water, the gas flow in porous cores has a starting pressure gradient, and when the production pressure difference is less than 16 MPa, the gas flow is in the same state. In the low-speed non-Darcy stage, the lower limit of permeability is 0.32mD under this differential pressure. In actual production process, gas well productivity can be improved by controlling water saturation, improving reservoir conductivity or increasing production pressure difference. This study has reference significance for grasping the gas flow characteristics of low permeability gas reservoirs and optimizing and adjusting production schemes.
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