焦坪区块煤层气水平井井型优化研究

发布时间：2018-08-31 13:36

【摘要】：焦坪矿区属于我国西北侏罗纪低煤级、低气含量区域，具有低压、低渗、低气含量的特点。在生产过程中，随着生产规模、开采深度和开采范围的不断增大，瓦斯灾害问题日益严重，如何高效地进行地面抽采瓦斯（煤层气），降低煤层瓦斯含量，减少煤矿瓦斯灾害威胁，成了进一步研究的主要目标。水平井技术作为煤层气开采最重要的增产手段之一，对进一步加快焦坪矿区煤层气规模化开发利用的步伐，，实现瓦斯利用与煤炭安全开采具有十分重要的意义。本文通过对焦坪矿区地质条件和储层特征的认识，主要做了以下几个方面的研究： ①分析论证了水平井开发技术在该区块的适用性； ②通过数值模拟的方法计算出了最佳的水平段长度、分支夹角、分支间距，并且利用优选的参数设计了U型井、V型井和多分支井三种水平井井型； ③对三种水平井井型分别进行经济评价，优选出最具开发潜力的一种井型。最后通过对比技术指标和经济指标可以得出： ①U型井所得税后财务内部收益率低于行业标准，其它指标都能满足投资要求。 ②V型井和多分支水平井的技术指标和经济指标都能满足投资要求。根据以上研究，推荐多分支水平井作为焦坪矿区水平井的开发井型。
[Abstract]:Jiaoping mining area belongs to low coal grade and low gas content area of Jurassic in northwest China, which has the characteristics of low pressure, low permeability and low gas content. In the process of production, with the increasing of production scale, mining depth and mining scope, the problem of gas disaster is becoming more and more serious. Reducing the threat of coal mine gas disaster has become the main goal of further research. Horizontal well technology, as one of the most important means to increase production of coalbed methane, is of great significance for further speeding up the development and utilization of coalbed methane on a large scale in Jiaoping mining area, and for realizing gas utilization and safe coal mining. Based on the understanding of the geological conditions and reservoir characteristics of Jiaoping mining area, this paper mainly studies the following aspects: 1 the applicability of horizontal well development technology in this block is analyzed and proved; (2) the optimum horizontal section length, branch angle and branch spacing are calculated by numerical simulation, and three kinds of horizontal well types, U well, V well and multi branch well, are designed by using the optimized parameters. 3 the economic evaluation of three kinds of horizontal well types is carried out, and one of the most potential well types is selected. Finally, by comparing the technical indicators and economic indicators, we can draw the following conclusions: 1 the financial internal rate of return after income tax of U type wells is lower than the industry standard. The technical and economic indexes of 2V well and multi-branch horizontal well can meet the requirement of investment. According to the above research, the multi-branch horizontal well is recommended as the development well type of horizontal well in Jiaoping mining area.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712.6;TE375

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