滑溜水压裂支撑剂在裂缝内的铺置规律研究

发布时间：2018-04-22 22:13

本文选题：滑溜水压裂 + 支撑剂铺置　；参考：《西安石油大学》2017年硕士论文

【摘要】：滑溜水压裂是非常规油气资源勘探开发的一项重要增产技术,在开采页岩气、致密砂岩气等非常规油气藏过程中起着举足轻重的作用。水力压裂的关键在于形成满足导流能力的填砂裂缝,支撑剂在裂缝中的铺置形态直接决定了压后增产效果。目前关于支撑剂在裂缝内的铺置规律研究主要基于小排量下的Babcock沉降运移模型,而对于大排量下的支撑剂铺置规律尚不明确,特别是裂缝入口处湍流效应对支撑剂铺置形态的影响还有待进一步研究。鉴于此,本文通过编制理论计算程序,从理论上分析了支撑剂铺置的主要影响因素,在此基础上利用大型可视化平行裂缝模拟装置研究了大排量下的支撑剂铺置规律,分析各影响因素对砂堤铺置形态、平衡高度、平衡时间、前缘距离以及前缘高度的影响。同时,在物理实验的基础上,利用Gambit前处理软件建立相应的几何数值模型,并利用Fluent软件模拟支撑剂在裂缝内的铺置规律,进一步分析了湍流效应对支撑剂铺置规律的影响。通过上述研究,本文主要取得了以下三点认识:(1)大排量下滑溜水压裂支撑剂在裂缝内的铺置规律不同于传统小排量下的铺置规律,且受裂缝入口处湍流效应的影响较为明显;(2)为了描述大排量下湍流效应对支撑剂铺置规律的影响,在前人的基础上引入支撑剂砂堤前缘高度,以便更全面的描述支撑剂在裂缝中的铺置形态;(3)对比分析物理实验和数值模拟实验结果,验证了支撑剂铺置数值模拟的正确性和可行性,并利用数值模拟方法进一步分析了大排量下湍流效应和压裂液粘度对支撑剂铺置规律的影响,为压裂施工方案设计提供了一定的参考。
[Abstract]:Slippery water fracturing is an important stimulation technique for exploration and development of unconventional oil and gas resources, which plays an important role in the process of producing unconventional oil and gas reservoirs such as shale gas and tight sandstone gas. The key of hydraulic fracturing is to form sand filling fractures that satisfy the flow conductivity. The placement form of proppant in the fracture directly determines the effect of increasing production after compression. At present, the research on the placement law of proppant in fracture is mainly based on the Babcock settlement migration model under small displacement, but the law of proppant placement under large displacement is not clear. In particular, the effect of turbulence at the crack entrance on the morphology of proppant placement remains to be further studied. In view of this, the main influencing factors of proppant placement are analyzed theoretically by compiling a theoretical calculation program. On this basis, the law of proppant placement under large displacement is studied by using a large visual parallel crack simulation device. The influence of various factors on sand embankment placement morphology, balance height, balance time, front edge distance and front edge height are analyzed. At the same time, on the basis of physical experiments, the corresponding geometric numerical model is established by using Gambit pre-processing software, and the law of proppant placement in cracks is simulated by Fluent software, and the influence of turbulence effect on the rule of proppant placement is further analyzed. Through the above research, this paper has mainly obtained the following three understandings: (1) the laying rule of slippery water fracturing proppant in large displacement is different from that under traditional small displacement. In order to describe the influence of turbulence effect on proppant placement under large displacement, the front height of proppant sand embankment is introduced on the basis of previous researches. The results of physical experiments and numerical simulation experiments are compared and analyzed, and the correctness and feasibility of numerical simulation of proppant placement are verified. The effects of turbulence effect and fracturing fluid viscosity on proppant placement are further analyzed by using numerical simulation method, which provides a certain reference for the design of fracturing operation scheme.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.12

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