火山岩气藏多级压裂水平井优化设计研究

发布时间：2018-03-31 10:45

本文选题：火山岩气藏　切入点：多级压裂水平井　出处：《东北石油大学》2015年硕士论文

【摘要】：中国火山岩气藏资源丰富,勘探开发前景广阔。加大火山岩气藏的开发力度,对于油田稳产战略实施、缓解日益严峻的能源压力具有重要意义。但火山岩气藏孔隙结构复杂,物性差、品味低,开发难度较大,常规直井压裂无法满足开发需求。国内外普遍使用“多级压裂水平井”开发技术,从而实现火山岩气藏的有效开发。火山岩气藏水平井经压裂后流动特征更加复杂,影响因素更多,而关于火山岩气藏多级压裂水平井渗流特征、产能预测方法和优化设计方面的理论较少,如何利用多级压裂水平井开发好火山岩气藏已成为重要的研究课题。为此,本文开展了火山岩气藏多级压裂水平井优化设计方面相关研究,主要做了以下工作:首先,通过文献调研,分析了多级压裂水平井增产机理,结合火山岩气藏储层特征和流动特征,利用点源函数和叠加原理等渗流理论,建立了单孔隙(天然裂缝不发育)、双重孔隙(天然裂缝发育)和三重孔隙(溶洞、天然裂缝发育)介质的多级压裂水平井渗流特征模型,揭示了火山岩气藏不同类型储层多级压裂水平井的渗流规律。其次,在考虑气体特性、火山岩气藏储层特征和流动特征基础上,基于三线流原理和裂缝产量叠加法,建立了单孔隙(天然裂缝不发育)、双重孔隙(天然裂缝发育)和三重孔隙(溶洞、天然裂缝发育)介质的火山岩气藏多级压裂水平井产能预测模型。再次,应用火山岩气藏产能预测模型,分析了弹性储能比、窜流系数、裂缝条数、裂缝导流能力和布缝方式等对水平井产能的影响,同时利用正交设计试验确定了各因素对水平井产能的影响程度和综合作用,揭示了火山岩气藏不同类型储层产量递减规律和累计产量变化规律。最后,在以上研究基础上,研究了多级压裂水平井的最优布缝方式,绘制了与储层渗透率相匹配的最优裂缝导流能力、裂缝间距和裂缝长度的图版,建立了火山岩气藏多级压裂水平井优化设计方法,并结合火山岩气藏水平井实际资料,进行了实例井的优化设计。本文研究为火山岩气藏水平井的高效开发提供了理论指导和依据。
[Abstract]:Volcanic gas reservoirs in China are rich in resources and have broad prospects for exploration and development. It is of great significance to increase the development of volcanic gas reservoirs for the implementation of stable production strategy in oil fields and to alleviate the increasingly severe energy pressure. However, the pore structure of volcanic gas reservoirs is complex. Poor physical property, low taste, great difficulty in development, the conventional straight well fracturing can not meet the development requirements. "multistage fracturing horizontal well" development technology is widely used at home and abroad. In order to realize the effective development of volcanic gas reservoirs, the flow characteristics of horizontal wells in volcanic gas reservoirs after fracturing are more complicated and the influencing factors are more, but the percolation characteristics of multi-fracturing horizontal wells in volcanic gas reservoirs are discussed. There are few theories on productivity prediction and optimization design. How to develop volcanic gas reservoirs by using multistage fracturing horizontal wells has become an important research topic. In this paper, the related research on the optimization design of multi-fracturing horizontal wells in volcanic gas reservoirs is carried out. The main works are as follows: firstly, through literature investigation, the mechanism of increasing production of multi-fracturing horizontal wells is analyzed. Combined with the reservoir characteristics and flow characteristics of volcanic gas reservoirs, single pore (natural fracture undeveloped), dual pore (natural fracture development) and triple pore (solution cave) are established by using point source function and superposition theory. The percolation characteristic model of multi-fracturing horizontal wells with natural fracture) reveals the percolation law of multi-fracturing horizontal wells in different types of volcanic gas reservoirs. Secondly, considering the gas characteristics, On the basis of reservoir characteristics and flow characteristics of volcanic gas reservoirs, based on the principle of three-line flow and the method of fracture production superposition, the single pore (natural fracture is not developed), dual pore (natural fracture development) and triple pore (cavern) are established. The productivity prediction model of multi-fracturing horizontal wells in volcanic gas reservoirs with natural fracture development is presented. Thirdly, the elastic energy storage ratio, channeling coefficient and fracture number are analyzed by using the productivity prediction model of volcanic gas reservoirs. The influence of fracture conductivity and fracture arrangement on the productivity of horizontal well is determined by orthogonal design test, and the degree of influence and comprehensive effect of each factor on horizontal well productivity are determined by orthogonal design test. This paper reveals the law of production decline and accumulative production change in different types of volcanic gas reservoirs. Finally, on the basis of the above research, the optimal fracturing pattern of horizontal wells with multistage fracturing is studied. The optimum fracture conductivity, fracture spacing and fracture length matching with reservoir permeability are drawn. The optimization design method of multi-fracturing horizontal wells in volcanic gas reservoirs is established, and the actual data of horizontal wells in volcanic gas reservoirs are combined. The optimal design of example wells is carried out. The study provides theoretical guidance and basis for the efficient development of horizontal wells in volcanic gas reservoirs.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE377

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