大倾角煤层压裂裂缝延展规律及技术对策研究

发布时间：2018-05-25 00:27

本文选题：大倾角 + 煤层　；参考：《西安科技大学》2015年硕士论文

【摘要】：大倾角煤层气资源普遍存在于国内地区,例如新疆阜康白杨河矿区是典型的大倾角煤层。该矿区主力煤层及其特点决定了压裂增产改造的特殊性,亟待针对其大倾角、裂缝延展规律不清楚、产气量下降过快等情况,开展大倾角煤层压裂裂缝延展规律及技术对策研究,满足生产需求,有效开发新疆阜康白杨河矿区煤层气资源。本论文以新疆阜康白杨河矿区为目标区块,开展大倾角煤层压裂裂缝延展规律及技术对策研究,既着重大倾角煤层的共性,也突出目标区块的个性。通过硕士期间的研究工作,取得主要研究成果如下:(1)收集、整理地质、压裂和排采资料,总结了目标区块地质特征,分别应用实验测试、测井解释、压后压降分析和试井解释四种方法进行了煤层物性评价,并提出了综合评价方法,奠定了后续研究及现场应用的基础。(2)结合目标区块的实际情况,引入诊断裂缝形态双重标准,对收集的78层压裂施工数据进行了裂缝延展形态研究,初步揭示了目标区块裂缝形态规律;同时,收集了微地震监测资料,对目标区块的裂缝延展方位进行了规律总结。(3)分别应用微地震裂缝监测、裂缝数值模拟和压后压降分析三种方法,确定了目标区块裂缝延展几何尺寸,引入不确定理论进行综合评估,进而论证了裂缝延展几何尺寸与煤层物性的匹配性。(4)在掌握大倾角煤层压裂裂缝延展规律基础上,归纳总结了煤层气增产的有利因素和不利因素,提出了相应的技术对策。
[Abstract]:Large dip coal bed methane resources generally exist in China, for example, Baiyang River mining area in Fukang, Xinjiang is a typical large dip coal seam. The main coal seam and its characteristics in this mining area determine the particularity of fracturing production and reconstruction. It is urgent to solve the problems such as large dip angle, unclear fracture extension rule, too fast decrease of gas production, etc. In order to meet the demand of production and effectively develop coal bed methane resources in Baiyang River mining area of Fukang Xinjiang the fracture extension law and technical countermeasures of fracturing in large inclined coal seam are studied. This paper takes Baiyang River mining area in Fukang Xinjiang as the target block to carry out the research on fracture extension law and technical countermeasures of fracturing in large dip coal seam. It not only has the commonness of major inclined coal seam but also highlights the individuality of target block. Through the research work during the master's period, the main research results are as follows: (1) collecting, sorting out geological, fracturing and removing production data, summarizing the geological characteristics of the target block, applying experimental tests and logging interpretation, respectively. Four methods of post-compression pressure drop analysis and well test interpretation are used to evaluate the physical properties of coal seam, and a comprehensive evaluation method is put forward, which establishes the foundation of follow-up research and field application. (2) combined with the actual situation of the target block, the double standard for the diagnosis of fracture morphology is introduced. The fracture extension morphology of 78 layers of fracturing operation data collected is studied, and the fracture morphology law of target block is preliminarily revealed, meanwhile, the micro-seismic monitoring data are collected. In this paper, the fracture extension azimuth of target block is summarized. (3) three methods of micro-seismic fracture monitoring, fracture numerical simulation and post-compression pressure drop analysis are used to determine the geometric dimension of crack extension in target block. The theory of uncertainty is introduced for comprehensive evaluation, and it is proved that the matching of fracture extension geometry size and coal seam physical properties is based on mastering the fracture extension law of large dip coal seam fracturing. This paper summarizes the favorable and unfavorable factors for increasing production of coalbed methane, and puts forward corresponding technical countermeasures.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357

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