贵州松河龙潭煤系非常规天然气储层强化机理与工艺

发布时间：2018-10-14 12:07

【摘要】：煤层群发育区煤层气开发技术具有其特殊性,煤层群的发育特征及其赋存的地质环境深刻影响了煤储层的可改造性。煤层气及其层间砂岩气叠合成藏的资源赋存特征,决定了储层强化工艺的多选性和复杂性。本文以煤层群发育的典型地区-贵州省盘江矿区松河井田龙潭煤系非常规天然气藏为研究对象,在煤储层地质背景、煤储层基础地质参数和开发工程探索试验研究的基础上,以地质分析方法为主要手段,研究了煤层气开发地质特征和储层特征,建立了煤层气开发的地质模型,阐明了煤层群条件下煤层气开发地质条件与开发工程的适配性,分析了基于开发地质模型和工程技术原理的储层强化机理与工艺,构建了煤层群发育区储层强化关键技术,形成了本地化的开发工程技术体系。研究表明:研究区龙潭煤系地层具有超压、过饱和的储层特征;“复杂、高、宽、短、多”是研究区典型压裂裂缝形态特征,而煤岩宏观裂隙、地应力、煤体结构、煤岩力学性质、射孔参数、隔夹层力学性质等是影响其发育的内在因素,工程施工是影响其发育的外在因素;采用小层射孔、分段压裂、投球封堵、机械填砂的压裂工艺、射孔煤层16孔/m、砂岩层32孔/m、弱酸化压裂液配方、多粒径类型多级加砂工艺、压裂液优化配比等工艺技术能够显著提高煤储层压裂效果;从地质制约和工程控制两方面分析和探讨了储层水力压裂影响因素,藉此建立了一套研究区煤层群储层水力压裂改造地质理论和施工参数体系,构建了研究区的煤储层水力压裂工艺技术。
[Abstract]:The development technology of coalbed methane in the coal seam group development area has its particularity. The development characteristics of the coal seam group and the geological environment in which the coal seam group occurs have a profound impact on the remolding of coal reservoir. The multi-selection and complexity of reservoir strengthening technology are determined by the resource occurrence characteristics of coalbed methane and interbedded sandstone gas stacked reservoirs. This paper takes the unconventional natural gas reservoir of Longtan coal series in Songhe mine field of Panjiang Mining area, Guizhou Province, as the research object. Based on the geological background of coal reservoir, the basic geological parameters of coal reservoir and the exploration and research of development engineering, the paper takes the unconventional natural gas reservoir of Longtan coal series in Panjiang Mining area, Guizhou Province, as the research object. Taking the geological analysis method as the main means, the geological characteristics and reservoir characteristics of coalbed methane development are studied, the geological model of coalbed methane development is established, and the adaptability of coalbed methane development geological condition and development engineering under the condition of coal seam group is expounded. This paper analyzes the reservoir strengthening mechanism and technology based on the development geological model and engineering technology principle, constructs the key technology of reservoir strengthening in the coal seam group development area, and forms a localized development engineering technology system. The results show that the strata of Longtan coal measure have overpressure and supersaturated reservoir characteristics, "complex, high, wide, short and many" are typical fracturing fracture morphological characteristics in the study area, while the macroscopic fractures of coal and rock, ground stress, coal body structure, etc. The mechanical properties of coal and rock, perforation parameters and mechanical properties of intercalation are the internal factors affecting its development, and the engineering construction is the external factor affecting its development, and the fracturing technology of small layer perforation, segmental fracturing, ball plugging and mechanical sand filling is adopted. The fracturing effect of coal reservoir can be improved by 16 holes / m in perforated coal seam, 32 holes / m in sandstone layer, the formulation of weak acid fracturing fluid, the multi-stage sand adding process with multi-particle size type and the optimized proportion of fracturing fluid. This paper analyzes and discusses the influencing factors of reservoir hydraulic fracturing from two aspects of geological restriction and engineering control, and establishes a set of geological theory and operation parameter system of hydraulic fracturing modification of coal seam group reservoir in the study area. The hydraulic fracturing technology of coal reservoir in the study area was constructed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37

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