摘要
在煤层层数较多的地区进行煤层气开采时,如果实施分层压裂、合层排采的技术,可以有效的降低煤层气的勘探开发成本,还可以提高单井产气量。研究分析此项技术的使用条件可以有效的提高多煤层合采的成功率。桑峨区内煤层层多,煤层结构较简单,厚度变化较小,是煤层气开发的较有利区块,在对直井产气特征研究的基础上,系统分析了主要煤层储层压力、压力梯度、临界解吸压力、储层渗透率、上下围岩特征等因素对合采的影响,认为研究区三套主力煤层基本符合分压合采的要求,可以考虑采用合层排采的方法来降低煤层气开采成本。
During the CBM reservoir exploitation in an area with multiple coal seams, if applying separate layer fracturing and multi- layer drainage technology, the cost of CBM exploration and exploitation can be reduced effectively, in addition, it can increase single- well gas production rate. Research and analysis on the using condition of such technology may improve the success rate of coal seam multi-layer drainage. There are many coal seams with simple structures and small variation of thickness in the Sange area, thus a favor- able block to CBM exploitation. Based on vertical well gas production characteristic study, the paper systemically analyzed the influenc- ing factors of main coal reservoir pressure, pressure gradient, critical desorption pressure, reservoir permeability and over.lying, underly- ing surrounding rock features in this area to multi-layer drainage. The analysis indicates that the three sets of main coal seams in the study area basically meet the requirement of separate layer fracturing and multi-layer drainage; meanwhile, it can reduce CBM exploi- tation c, ost.
出处
《中国煤炭地质》
2013年第12期52-54,共3页
Coal Geology of China
关键词
煤层气
分层压裂
合层排采
影响因素
桑峨区
鄂尔多斯盆地东缘
CBM
separate layer fracturing
multi-layer drainage
influencing factors
Sange area
eastern margin of Ordos Basin
