【作者】 何真培；

【导师】 李树刚；

【作者基本信息】 西安科技大学 ， 安全技术及工程， 2011， 硕士

【摘要】 本文以煤层瓦斯赋存与流动的基本定律以及煤层导热微分方程为基础,根据流体在多孔介质中的守恒定律,以钻孔周围煤层温度场和瓦斯渗流场为研究对象,建立了等温、非等温条件下钻孔周围煤层瓦斯非稳定流动数学模型。运用Matlab软件编程开发了钻孔瓦斯抽放模拟软件,对等温、非等温条件下钻孔周围煤层瓦斯流动模型进行了模拟计算及图形绘制。为了便于用户进行对比分析,该软件除了可以求解钻孔周围煤层瓦斯流动数学模型外,还可以绘制钻孔瓦斯比流量、累计钻孔瓦斯抽放量、钻孔卸压区范围随时间的变化图以及钻孔周围煤层瓦斯压力分布、煤层温度分布等图形。本文以天池矿401工作面为试验现场,根据煤层及钻孔基础资料,运用所开发的钻孔瓦斯抽放模拟软件,对不同抽放条件下(等温或非等温,不同钻孔抽放负压、钻孔直径、抽放时间)累计钻孔瓦斯抽放量、钻孔瓦斯比流量、卸压区范围、钻孔周围煤层瓦斯压力及煤层温度等的变化情况进行了模拟分析,结合现场实际情况,得出了天池矿401工作面的最佳钻孔瓦斯抽放参数。更多还原

【Abstract】 This article takes the coalseam temperature and gas seepage field aroud the drillhole as the research object, on the basis of the occurrence and flow of coalbed gas and the differential equation of the coalseam heat conduction laws, according to the conservation of mass of the fluid in the porous media, established the unsteady flow model of the coalseam gas aroud the drillhole under the isothermal and non-isothermal conditions. By means of MATLAB programs developed the simulation software of gas drainage, and use it solved the model and plotted its graphics. In order to facilitate comparison and analysis of users, the software not only can solve the flow equations of the coalseam gas aroudding drillhole, but also can draw the graphics of gas flowrate, cumulative gas flow and pressure released area of drillhole chang over time, and the graphics of temperature and pressure distribution of the coalseam arrounding drillhole.This article takes the 401 coalface of Tianchi coal mine as testing site, according to the initial data of the coalseam and drilling, by use of the software simulated and analyzed the changes of the gas flowrate, cumulative gas flow, pressure released area and the pressure and temperature field of coalbed aroundding drillhole under different conditions (such as isothermal or non-isothermal, different negative pressure, drillhole diameter and time), and based on the actual situation of the site, we obtained the best parameters of gas drainage for the 401 working face.更多还原