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进行火山岩气藏压裂改造时,通常采用形成单一裂缝的增产改造技术,气井稳产时间较短。借鉴页岩气开发理念,深入研究火山岩气藏体积压裂机理。根据缝内压力传导的力学模型,研究不同液体体系对压力传导的影响,分析无滤饼压裂液体系对体积压裂的作用,优选出压裂液体系;建立不同角度天然裂缝开启的力学模型,确立体积形成的关键力学条件,并针对火山岩气藏压裂目的层的地应力结构进行实际分析。从储层矿物角度出发,研究对比火山岩储层的脆性系数;根据力学条件,结合压裂工艺过程,建立相关模型,优化研究体积压裂关键工艺参数,包括排量、压裂规模等;分析降阻水、线性胶、浓胶液三种不同黏度液体对裂缝网络的作用。在上述研究基础上,针对新疆油田DX1413井实际地质条件,分析该井进行体积压裂的有利条件,并进行压裂设计与改造施工,对施工曲线、施工过程、施工结果进行分析,得到了一些有益的结论,这些结论对火山岩气藏的开发有重要的启迪作用。
During the fracturing reformation of volcanic gas reservoirs, the stimulation technique of single-fracture stimulation is usually adopted, and the stable production time of gas wells is short. Draw lessons from the shale gas development concept, in-depth study of volumetric fracturing mechanism of volcanic gas reservoirs. According to the mechanics model of pressure transmission in the seam, the influence of different liquid systems on the pressure transmission was studied. The effect of the system without filter cake fracturing on volumetric fracturing was analyzed, and the fracturing fluid system was optimized. The mechanical model with natural cracks opened at different angles , Establish the key mechanics conditions of volume formation, and conduct a practical analysis of the geostress structure of the target layer of fracturing in volcanic gas reservoirs. From the perspective of reservoir minerals, the brittleness coefficient of volcanic reservoirs is compared and studied. According to the mechanical conditions, combined with the fracturing process, relevant models are established to optimize the key process parameters of volumetric fracturing, including displacement and fracturing scale. Water blocking, linear glue, concentrated glue three different viscosity liquid on the crack network. On the basis of the above studies, in view of the actual geologic conditions of well DX1413 in Xinjiang Oilfield, the favorable conditions for volumetric fracturing of the well are analyzed and the fracturing design and reconstruction are carried out. The construction curves, construction process and construction results are analyzed and some Beneficial conclusions, these conclusions have important enlightenment on the development of volcanic gas reservoirs.