沁水盆地南部高阶煤储层气水产出过程分析

发布时间：2018-03-05 06:38

本文选题：煤储层　切入点：煤层气　出处：《煤炭科学技术》2017年09期 　论文类型：期刊论文

【摘要】：为了探讨煤层气井排采控制指标,以沁水盆地南部高阶煤为研究对象,基于气-水相对渗透率试验和渗流物理仿真模拟,探讨了宏观与微观渗流网络中气-水相对渗透率变化机制,并进一步阐述了煤储层气、水产出过程。结果表明,宏观裂隙气-水相渗曲线分为气-水同流区和纯气流动区;微观孔裂隙气-水相渗曲线分为单相水流区、气-水同流区和纯气流动区。煤储层流体产出过程可归纳为开发初期宏观裂隙中水带气的过程,微观孔裂隙中水的单相流动阶段,气相饱和度上升阶段,气驱水的过程,气的单相流动阶段,以及宏观裂隙中气的单相流动阶段。其中,微观孔裂隙中气驱水的过程是高产气井稳定产液的关键,而游离气产出则是煤层压力整体下降的基础。
[Abstract]:In order to discuss the control index of coal bed methane well drainage, taking high-order coal in the south of Qinshui Basin as the research object, based on the gas-water relative permeability test and the physical simulation of seepage flow, The variation mechanism of relative permeability between gas and water in macroscopic and micro seepage networks is discussed, and the process of gas and aquatic production in coal reservoir is further expounded. The results show that the macroscopic fissure gas-water phase permeability curve can be divided into gas-water cocurrent zone and pure gas flow zone. The gas-water phase permeation curve of micro-pore fracture can be divided into single-phase flow zone, gas-water co-flow zone and pure gas flow zone. The fluid production process of coal reservoir can be summarized as the process of water belt gas in macroscopic fissure in the early stage of development, and the single-phase flow stage of water in micro-pore fissure. The process of gas saturation rising, the process of gas driving water, the phase of single phase flow of gas, and the phase of single phase flow of gas in macroscopic fracture. The free gas production is the basis for the overall decrease of coal seam pressure.
【作者单位】：中国矿业大学低碳能源研究院江苏省煤基CO2捕集与地质存储重点实验室;中国矿业大学资源与地球科学学院煤层气资源与成藏过程教育部重点实验室;赫瑞瓦特大学石油工程学院;中国石油天然气股份有限公司华北油田分公司;山东省科学院海洋仪器仪表研究所;
【基金】：国家自然科学基金资助项目(41402135,41330638) 国家重点基础研究发展计划(973计划)资助项目(2009CB219608) 中石油重大科技专项资助项目(2013E-2205)
【分类号】：P618.13

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