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水侵气藏型储气库气水微观渗流规律
Microscopic percolation laws of gas and water in underground gas storages rebuilt from water-invasion gas reservoirs
石 磊1,2 王皆明1,2 朱华银1,2 段 宇3
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DOI:
作者单位:1. 中国石油勘探开发研究院  2. 中国石油天然气集团公司油气地下储库工程重点实验室 3. 中海石油( 中国) 有限公司天津分公司渤海石油研究院
中文关键字: 水侵气藏 储气库 微观渗流 气水相渗 可动流体 核磁共振
英文关键字:Water-invasion gas reservoir; Underground gas storage; Microscopic percolation; Gas-water relative permeability; Movable fluid; Nuclear magnetic resonance
中文摘要:    与常规油气田多相流体渗流特征实验研究不同,水侵气藏型储气库主要是解决多次注采循环条件下的气水渗流机理,在实验目的和实验设计等方面都有其特殊性、复杂性。通过水侵气藏型储气库物理模拟实验的自主设计和研发,主要形成2 个方面的物理模拟评价技术,包括分区带气水吸吮—排驱稳态相渗特征评价技术、多次注采循环岩心微观核磁共振可动流体评价技术,从微观角度解决了流体渗流与空间动用评价的实验技术难题。将该技术方法应用于典型水侵气藏储气库HT,研究结果表明:①水侵气藏型储气库高速注采气运行过程中,储气空间出现气水过渡带、气驱水纯气带、建库前纯气带3 个区带。②在储层发育、反复水侵、高速大压差注采等多因素影响下,各区带出现微观孔隙空间渗流及动用差异。此套技术为了我国水侵气藏型储气库的建设和运行机理评价提供了有效技术手段。
英文摘要:    Different from other studies on the percolation characteristics of multiphase fluid in conventional oil and gas fields, an experimental study on underground gas storage (UGS) rebuilt from water-invasion gas reservoirs mainly aims to figure out the gas and water percolation mechanism under the condition of multiple injection-production cycles, and it has particularity and complexity in purpose and design. By independent designing and implementing several physical simulation experimnts on these UGSs, two technologies
of physical simulation evaluation were developed, including one technology for the steady-state relative-permeability characteristics of zonal gas & water imbibition and displacement, and another technology of micro NMR evaluation for the movable fluid in cores after multiple injection-production cycles, which may microscopically solve many problems of fluid percolation and space utilization evaluation. These two technologies were applied to one typical HT UGS from water-invasion gas reservoirs. Results show that,
(1) during a high-speed injection-withdrawal process of HT UGS, three zones appear in gas storage space, including gas-water transition zone, pure gas zone after gas-driving water, and pure gas zone before its building, and (2) for micro pore space in different zones, the percolation and utilization are different under some influence of reservoir development, repeated water invasion, and high-speed injection and withdrawal under large pressure difference. These technologies may provide effective technical means for evaluating the mechanism of China's UGSs rebuilt from water-invasion gas reservoirs.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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