Reservoir reconstruction technologies for coalbed methane recovery in deep and multiple seams
Reservoir reconstruction technologies for coalbed methane recovery in deep and multiple seams
复制标题
深层多煤层煤层气开采储层改造技术
DOI：
10.1016/j.ijmst.2017.01.026
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发表时间：
2017-03
影响因子：
11.8
通讯作者：
Guo Pinkun
中科院分区：
文献类型：
--
作者：
Wang Liang;Liu Shimin;Cheng Yuanping;Yin Guangzhi;Zhang dongming;Guo Pinkun
中国深部含煤地层广泛发育多煤层。随着开采深度的增加，地表地应力和煤层瓦斯压力不断增大，煤与瓦斯突出灾害日益严重。当煤层埋深很大时，瓦斯含量和压力升高，煤层易发生突出。初采煤层开采的安全性和经济性受到极大的制约。同时，多煤层赋存条件导致含煤地层中甲烷压力系统不同，给煤储层改造带来困难。针对我国煤层低饱和度、低渗透率、各向异性强、煤层松软的特点，采用地面单井水力压裂改造储层，实现多煤层在不同瓦斯压力系统下同时预排煤层气，至今尚未取得突破性进展。在分析我国深部煤层气储层主要特征、目前瓦斯治理方法及深部多煤层面临的挑战的基础上，提出了深部煤层气储层改造新技术，实现煤与瓦斯同时高效开采。特别是根据有效性和经济性原则确定了首采层位，并利用水力压裂地面井对首采层位进行了改造，扩大了首采层位的选择范围。在开采首采煤层的过程中，利用空间瓦斯抽放和综合抽放（地下与地面煤层气抽采相结合）的方法，在采动作用下改造邻近煤层，促进瓦斯高效卸压抽采。详细介绍了“一井三用”油藏综合改造技术在庐陵煤矿的成功应用。现场应用表明，该技术能有效促进煤矿安全开采，同时实现瓦斯高效抽采。
Multiple coal seams widely develop in the deep Chinese coal-bearing strata. Ground in situ stress and coal seam gas pressure increase continuously with the increase of the mining depth, and coal and gas outburst disasters become increasingly severe. When the coal is very deep, the gas content and pressure will elevate and thus coal seams tends to outburst-prone seams. The safety and economics of exploited first-mined coal seams are tremendously restricted. Meanwhile, the multiple seams occurrence conditions resulted in different methane pressure systems in the coal-bearing strata, which made the reservoir reconstruction of coal difficult. Given the characteristics of low saturation, low permeability, strong anisotropy and soft coal of Chinese coal seams, a single hydraulic fracturing surface well for reservoir reconstruction to pre-drain the coalbed methane (CBM) of multiple seams concurrently under the different gas pressure systems has not yet gained any breakthroughs. Based on analyses of the main features of deep CBM reservoirs in China, current gas control methods and the existing challenges in deep and multiple seams, we proposed a new technology for deep CBM reservoir reconstruction to realize simultaneous high-efficiency coal mining and gas extraction. In particular, we determined the first-mined seam according to the principles of effectiveness and economics, and used hydraulic fracturing surface well to reconstruct the first-mined seam which enlarges the selection range of the first-mined seam. During the process of mining first-mined seam, adjacent coal seams could be reconstructed under the mining effect which promoted high-efficiency pressure relief gas extraction by using spatial and comprehensive gas drainage methods (combination of underground and ground CBM extraction methods). A typical integrated reservoir reconstruction technology, “One well for triple use”, was detailed introduced and successfully applied in the Luling coal mine. The application showed that the proposed technology could effectively promote coal mining safety and simultaneously high-efficiency gas extraction.
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