致密砂岩气藏气水同产水平井稳态产能研究
发布时间：2018-07-25 12:48
【摘要】：致密砂岩气资源作为国内天然气生产的主力军之一,在相当长时期内有望充当非常规天然气资源开发的“领头羊”。但由于致密砂岩气藏特殊的气藏特征以及渗流机理,相比常规气藏而言,储量丰度小,产量递减快,最终使得开发难度大,技术要求高。因此对致密砂岩气藏特征、渗流机理以及不同井型气井产能的研究变得至关重要。 本文在充分调研常规水平井产能、气水同产井产能以及压裂水平井产能的基础上,结合致密砂岩气藏基本特征,产水机理以及储层流体渗流机理,考虑储层以及裂缝应力敏感、气体滑脱效应以及近井地带高速非达西流效应的影响,定义储层气体广义拟压力以及气水两相广义拟压力,裂缝气体广义拟压力以及气水两相拟压力,应用保角变换方法以及势的叠加原理建立了致密砂岩气藏水平井以及压裂水平井单相、两相产能模型,并利用各向异性系数以及表皮系数对产能模型进行了修正,同时考虑水平井井筒变质量流动,将储层渗流模型以及储层-裂缝渗流模型与水平井井筒管流模型耦合起来,最后运用实例数据验证了产能模型的准确性,并对影响气水同产水平井以及压裂水平井产能的因素进行了分析,得出了各因素对气井产能影响的程度。 本文研究进一步完善和充实了致密砂岩气藏不同井型气井产能分析理论体系,研究结果可用于致密砂岩气藏压裂施工参数的优化以及气井合理工作制度的确定,具有较高的理论价值和广阔的应用前景,为今后更加深入地研究致密砂岩气藏奠定理论基础。
[Abstract]:As one of the main forces of natural gas production in China, tight sandstone gas resources are expected to be the "leaders" of unconventional natural gas resources development for a long time. However, due to the special gas reservoir characteristics and percolation mechanism of tight sandstone gas reservoir, compared with conventional gas reservoirs, reserves abundance is small and production decline is fast, which ultimately makes development difficult and technical requirements high. Therefore, it is very important to study the characteristics of tight sandstone gas reservoir, percolation mechanism and productivity of different well type gas wells. On the basis of investigating the productivity of conventional horizontal wells, gas and water production wells and fracturing horizontal wells, combined with the basic characteristics of tight sandstone gas reservoir, water production mechanism and fluid percolation mechanism, the reservoir and fracture stress sensitivity are considered in this paper. The effects of gas slippage and high speed non-Darcy flow near well zone are defined to define the generalized pseudo pressure of reservoir gas, the generalized pseudo pressure of gas and water, the generalized pseudo pressure of fractured gas and the pseudo pressure of gas and water. The single-phase and two-phase productivity models of horizontal well and fracturing horizontal well in tight sandstone gas reservoir are established by means of conformal transformation method and potential superposition principle, and the productivity model is modified by anisotropy coefficient and epidermal coefficient. At the same time, considering the variable mass flow in horizontal wellbore, the reservoir percolation model and the reservoir fracture percolation model are coupled with the horizontal well wellbore pipe flow model. Finally, the accuracy of productivity model is verified by the example data. The factors influencing the productivity of horizontal wells with the same gas and water production and fracturing horizontal wells are analyzed, and the degree of influence of each factor on the productivity of gas wells is obtained. In this paper, the theoretical system of productivity analysis for different well types of gas wells in tight sandstone gas reservoirs is further improved and enriched. The results can be used to optimize the fracturing operation parameters of tight sandstone gas reservoirs and to determine the reasonable working rules of gas wells. It has high theoretical value and broad application prospect, which lays a theoretical foundation for the further study of tight sandstone gas reservoirs in the future.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE328
本文编号：2143877
[Abstract]:As one of the main forces of natural gas production in China, tight sandstone gas resources are expected to be the "leaders" of unconventional natural gas resources development for a long time. However, due to the special gas reservoir characteristics and percolation mechanism of tight sandstone gas reservoir, compared with conventional gas reservoirs, reserves abundance is small and production decline is fast, which ultimately makes development difficult and technical requirements high. Therefore, it is very important to study the characteristics of tight sandstone gas reservoir, percolation mechanism and productivity of different well type gas wells. On the basis of investigating the productivity of conventional horizontal wells, gas and water production wells and fracturing horizontal wells, combined with the basic characteristics of tight sandstone gas reservoir, water production mechanism and fluid percolation mechanism, the reservoir and fracture stress sensitivity are considered in this paper. The effects of gas slippage and high speed non-Darcy flow near well zone are defined to define the generalized pseudo pressure of reservoir gas, the generalized pseudo pressure of gas and water, the generalized pseudo pressure of fractured gas and the pseudo pressure of gas and water. The single-phase and two-phase productivity models of horizontal well and fracturing horizontal well in tight sandstone gas reservoir are established by means of conformal transformation method and potential superposition principle, and the productivity model is modified by anisotropy coefficient and epidermal coefficient. At the same time, considering the variable mass flow in horizontal wellbore, the reservoir percolation model and the reservoir fracture percolation model are coupled with the horizontal well wellbore pipe flow model. Finally, the accuracy of productivity model is verified by the example data. The factors influencing the productivity of horizontal wells with the same gas and water production and fracturing horizontal wells are analyzed, and the degree of influence of each factor on the productivity of gas wells is obtained. In this paper, the theoretical system of productivity analysis for different well types of gas wells in tight sandstone gas reservoirs is further improved and enriched. The results can be used to optimize the fracturing operation parameters of tight sandstone gas reservoirs and to determine the reasonable working rules of gas wells. It has high theoretical value and broad application prospect, which lays a theoretical foundation for the further study of tight sandstone gas reservoirs in the future.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE328
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