煤层气井排采制度优化

发布时间：2018-06-24 20:05

本文选题：煤层气 + 垂直井　；参考：《西南石油大学》2015年硕士论文

【摘要】：随着我国经济的快速腾飞和日益加剧的缺油少气能源现状,国家对煤层气能源的开发需求日益倍增。高效开发煤层气,煤层含气量是开发基础、渗透性是开发关键、合理的排采制度是开发保障。本论文在总结国内外学者研究煤层渗透率在排采阶段动态变化规律和煤层气井排采规律的基础上,运用煤层气地质与开发的理论知识,针对国内绝大多数低压低渗煤层气井,建立煤层气井水力压裂后渗透率预测模型,并将大多数煤层气垂直气井水力压裂后的排采阶段分为饱和水单相流阶段、非饱和水单相流阶段、气水两相流定排采阶段、定压阶段和气水两相流仅在某些方向传递的定排采阶段、定压阶段六个阶段,结合煤层地质参数和现场增产改造施工参数,通过排采阶段煤层渗透率动态变化这条主线将六个阶段串联起来,数值分析不同排采阶段由井底压力变化引起的产水量、产气量、动液面高度、井底流压、解吸半径和压力传播半径六个工程参数的变化,编写煤层气单井排采制度优化软件,从理论上对排采制度进行细化。同时,以试验井Y1井的地质分析、岩芯分析、试井资料分析以及水力压裂现场数据为基础,将编制的煤层气井排采制度优化软件工程应用于Y1井,进行模拟并建立合理的排采制度。用模拟得到的数据对煤层气井排采制度的影响因素进行分析,从而加深对煤层气井排采制度的认识。
[Abstract]:With the rapid development of China's economy and the increasing shortage of oil and gas, the demand for coal-bed methane (CBM) energy is increasing. High efficiency development of coalbed methane, coal seam gas content is the basis of development, permeability is the key to development, reasonable drainage system is the development guarantee. On the basis of summing up the domestic and foreign scholars' research on the dynamic change law of coal seam permeability in the stage of coal seam drainage and the rule of coal bed methane well drainage, this paper applies the theoretical knowledge of coal bed methane geology and development to the vast majority of low pressure and low permeability coal bed methane wells in China. The permeability prediction model of coalbed methane wells after hydraulic fracturing is established, and the recovery stage after hydraulic fracturing in most coalbed methane vertical gas wells is divided into saturated water single-phase flow stage, unsaturated single-phase flow stage, gas-water two-phase flow stage and fixed drainage stage. The constant pressure stage and gas-water two-phase flow are only transferred in some directions in the fixed discharge mining stage, the constant pressure stage in six stages, combined with the coal seam geological parameters and site production and reconstruction of construction parameters. Through the main line of dynamic change of coal seam permeability in drainage stage, the six stages are connected in series, and the water production, gas production, dynamic liquid level height, bottom hole flow pressure caused by the change of bottom hole pressure in different drainage stages are numerically analyzed. Based on the variation of six engineering parameters of desorption radius and pressure propagation radius, the optimization software of coal bed methane single well drainage system is compiled, and the drainage system is refined theoretically. At the same time, based on the geological analysis, core analysis, well test data analysis and hydraulic fracturing field data of well Y1, the software engineering for optimizing production system of coalbed methane well is applied to Y1 well. Carry out simulation and establish reasonable drainage system. By using the simulated data, the influencing factors of the coal bed methane well drainage system are analyzed, and the understanding of the coal bed gas well drainage system is deepened.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37

【参考文献】