潘庄某区块煤层气田开发动态评价

发布时间：2018-10-15 07:12

【摘要】：近年来我国煤层气地面开发工程扩展迅速。煤层气产业发展所面临的主要的挑战是单井平均产能低。其原因之一是对排采过程中气、水流体和储层物性参数动态变化规律不了解,对参数变化对产能的影响认识不足。本论文以沁水盆地南部潘庄地区某煤层气开发区块作为研究对象,通过分析研究区内单井排采过程,对单井和气田进行储层模拟、分析和讨论,取得如下4个方面的成果。①参数拟合结果显示,注入/压降法测试的渗透率偏低;单井排采过程中,储层压力、水饱和度和剩余含气量等不断降低,并以漏斗形式不断向下、向外扩展;初始储层压力大于临界解吸压力时,孔隙度和渗透率先减小后增大,而初始储层压力接近临界解吸压力时,孔隙度和渗透率以增大为主。②建立了研究区地质模型,在全区内布井437口,确定排水速度4.18m3/d,模拟了研究区煤层气田孔渗动态和静态条件下的开发过程。③随着气田开发,研究区流体特征和物性特征动态变化且平面分异明显;在孔、渗动态变化的影响下,气田总产能增大,影响过程分3个阶段;将研究区划分为三个地质单元,针对不同地质单元的地质条件和产气情况,调整开发方案,新方案减少建井38口,但总产能增加。④煤层气田开发动态评价方法体系包括地质建模、参数校正和优化、气田开发动态评价过程和规律认识,以及气田开发效果预测与评价四个步骤;从不同角度对优化排采工作制度提出了建议。
[Abstract]:In recent years, the development project of CBM in China has expanded rapidly. The main challenge to the development of CBM industry is the low average productivity of single well. One of the reasons is that the dynamic change law of gas, water fluid and reservoir physical parameters is not well understood, and the influence of parameter change on productivity is not well understood. In this paper, a coalbed methane development block in Panzhuang area, south of Qinshui Basin, is taken as the research object. Through the analysis of the single well drainage process in the study area, the reservoir simulation, analysis and discussion of single well and gas field are carried out. The results of parameter fitting show that the permeability measured by the injection / pressure drop method is on the low side, and the reservoir pressure, water saturation and residual gas content are decreasing in the process of single well production, and the reservoir pressure, water saturation and residual gas content are decreasing continuously in the form of funnel. When the initial reservoir pressure is greater than the critical desorption pressure, the porosity and permeability decrease first and then increase, while when the initial reservoir pressure approaches the critical desorption pressure, the porosity and permeability increase mainly. In 437 wells distributed in the whole area, the drainage velocity is determined to be 4.18 m3 / d, and the development process under dynamic and static conditions of field porosity and permeability of coalbed gas in the study area is simulated. 3 with the development of gas field, the fluid and physical characteristics of the study area change dynamically and the plane is different obviously. Under the influence of the dynamic change of permeability, the total productivity of the gas field increases and the influence process is divided into three stages, and the research regionalization is divided into three geological units, and according to the geological conditions and gas production conditions of different geological units, the development scheme is adjusted. The new scheme reduces the number of wells built by 38 wells, but the total productivity is increased. 4 the evaluation method system for coalbed methane field development includes geological modeling, parameter correction and optimization, and understanding of the process and law of gas field development dynamic evaluation. Four steps of predicting and evaluating the development effect of gas field are given, and suggestions on optimizing the system of drainage and production are put forward from different points of view.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE332

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