水力压裂增透抽采技术在重庆某矿的应用研究

发布时间：2018-05-13 16:17

本文选题：水力压裂 + 卸压增透　；参考：《贵州大学》2015年硕士论文

【摘要】：本文针对兴隆煤矿低透气性突出煤层,采用理论分析、数值模拟和现场试验相结合的研究方法,对其开展水力压裂卸压增透抽采技术的研究及研究成果应用的经济效益分析。主要研究内容如下:(1)选取兴隆煤矿三个穿层和三个顺层水力压裂点,通过分析确定合理的模型参数,应用RFPA2D-Flow渗流分析版数值分析软件,模拟得到煤岩体在注水压力不断增加下的应力分布图和声发射图(直观显现孔壁周围煤岩体从微裂隙产生、逐渐扩展直至大面积破裂),并得出它们的水力压裂破煤注水压力、渗透范围。(2)通过对穿层及顺层压裂钻孔的模拟结果作进一步分析研究,分别求出破煤注水压力p、渗透范围r与煤层埋深h、煤层坚固性系数f值的关系式,作为试验钻孔压裂参数计算方法。(3)通过选取+200m一区南抽放巷、1601S采煤工作面为试验地点,根据试验钻孔压裂参数计算方法设计试验钻孔间距及相关参数,并进行水力压裂现场试验,进而对检验钻孔煤样水分测试,得到试验钻孔实际压裂参数,其与压裂参数计算方法所得结果表现出较好的一致性,说明该方法基本合理,可作为矿井水力压裂钻孔间距及相关参数设计依据(地质构造带应用此方法时,需充分考虑其影响)。(4)经与矿井原有压裂钻孔进行技术比较,两试验地点的水力压裂钻孔间距增加后,预抽块段煤层瓦斯的抽采率相差很小,但压裂钻孔利用率明显增加,说明原有压裂参数设计不合理,应根据压裂参数计算方法,优化压裂参数,保持增透效果,降低压裂成本,增加经济效益。(5)通过对试验区和推广区采用试验方案和原有方案的水力压裂经济成本进行比较,得出本文研究成果应用的经济效益。
[Abstract]:Aiming at the low permeability outburst coal seam of Xinglong Coal Mine, this paper adopts the research method of combining theoretical analysis, numerical simulation and field test to study the technology of hydraulic fracturing unpressurization and antipenetration pumping and the economic benefit analysis of the application of the research results. The main research contents are as follows: (1) selecting three hydraulic fracturing points in Xinglong coal mine, determining reasonable model parameters and applying RFPA2D-Flow seepage analysis software. The stress distribution map and acoustic emission diagram of coal and rock mass under increasing water injection pressure were obtained by simulation. (the coal and rock mass around the hole wall appeared from microcracks and gradually expanded to a large area of fracture, and their hydraulic fracturing water injection pressure was obtained. Through further analysis and study on the simulation results of perforating and bedding fracturing drilling, the relationship between water injection pressure (p) and penetration range r (r) and the depth of coal seam (h), and the coefficient of coal seam solidity (f) are obtained, respectively. As a method for calculating the fracturing parameters of test boreholes, the distance between test boreholes and related parameters is designed according to the calculation method of fracturing parameters of test boreholes by selecting the coal mining face No. 1601S of south pumping roadway in 200m area as the test site. The hydraulic fracturing field test is carried out, and the actual fracturing parameters of the test borehole are obtained by testing the water content of the coal sample of the borehole, which shows good agreement with the results obtained by the fracturing parameter calculation method, which shows that the method is basically reasonable. It can be used as the basis for the design of the spacing and related parameters of the hydraulic fracturing borehole in the mine. (when the geological structure belt applies this method, the influence of this method should be taken into full consideration.) the technical comparison with the original fracturing borehole in the mine is carried out. When the spacing of hydraulic fracturing boreholes increases in two test sites, the difference of gas extraction rate in pre-pumped coal seam is very small, but the utilization ratio of fracturing boreholes increases obviously, which indicates that the design of original fracturing parameters is unreasonable, and the calculation method of fracturing parameters should be used. By optimizing the fracturing parameters, keeping the antireflection effect, reducing the fracturing cost and increasing the economic benefit, the economic cost of hydraulic fracturing in the test area and the extension area is compared with that of the original scheme. The economic benefits of the application of the research results in this paper are obtained.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD712.6

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