摘要
韩城矿区单井产气量差异较大,为明确其主要控产因素,以该区生产数据为基础,归纳出三种单井产能模式,分别为模式Ⅰ:单峰-衰减式、模式Ⅱ:单峰-稳定式以及模式Ⅲ:多峰—不连续式,分别代表中高产井、低产井及不产气井特征。依据地质、构造及钻井资料,对产能模式影响因素进行分析,研究认为构造及水文地质条件对区内含气量有重要影响,总体保存条件较优越,在东南缘边浅部含气量较低,其余区域均较高。渗透率主要受煤体结构及埋深控制,在碎裂煤区渗透率较高,碎粒煤、粉煤区较低,而原生结构煤区渗透率由埋深条件控制。结果表明煤层气生产特征主要受构造控制,其控制了含气量、水文地质特征、埋深及煤体结构,从而决定了该区煤层气井产能差异现状。
Based on the fact that the production of gas wells in Hancheng Mining Area is quite different,in order to make clear the main factors of production control, three production models of single well are summed up on the basis of production data of Hancheng Mining Area,Mode I： single peak-attenuation type,Mode II： single peak-stable type and Mode III： multi peak-discontinuous type. The characteristics of medium high yield wells,low producing wells and nonproducing gas wells are respectively represented. Based on the geological,structural and drilling data,the influencing factors of productivity model are analyzed from three aspects of coal seam thickness,gas content and permeability. It is considered that the thickness of coal seam has little influence on productivity characteristics,and the gas content and permeability condition are the main controlling factors. The structure and hydrogeological condition have important influence on the gas content in the area,and the overall preservation condition is superior. Besides the southeast edge and the shallow part,the gas content in the other areas is higher. The permeability is mainly affected by the coal structure and depth control,generally in the regions of fractured coal is of high permeability,pulverized coal,coal particle area is relatively low,and the permeability of the primary structure coal area by depth control. The results show that coalbed methane production is mainly controlled by structure. It controls gas content,hydrogeological characteristics,depth of formation and structure of coal. It is the key factor that affects the productivity of CBM well in this area.
作者
涂志民
李鹏
吕娜
伊伟
张亮
TU Zhi-min;LI Peng;LV Na;YI Wei;ZHANG Liang(PetroChina CoMbed Methane Co., Ltd., Hancheng 715400, China)
出处
《煤炭工程》
北大核心
2018年第4期126-131,共6页
Coal Engineering
关键词
韩城
煤层气
主控因素
产能模式
含气量
渗透率
Hancheng
coal bed methane
main controlling factors
capacity mode
gas content
permeability
