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Role of VES-based fracturing fluid on gas sorption and diffusion of coal: an experimental study of Illinois basin coal
Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2021-03-04 , DOI: 10.1016/j.psep.2021.03.002
Qiming Huang , Shimin Liu , Bing Wu , Gang Wang , Guofu Li , Zhiguo Guo

As a kind of environmentally friendly and non-polluting fracturing fluid, the VES-based fracturing fluid is gradually promoted in the field coalbed methane (CBM) stimulation in recent year. However, the fracturing fluid residue trapped in the reservoir may have a potential negative impact on gas flow in CBM reservoirs. In this study, the fracturing fluid based on surfactant was selected to treat the coal sample. The lab experiments have been conducted including the isothermal methane sorption, the low-temperature nitrogen sorption and the 13C nuclear magnetic resonance (NMR) measurements. The results showed that the methane sorption capacity was modified with cleaning fluid treatment and residuals. It was found that the sorption capacity can be recovered through water washing. It is important to point out that the diffusivity of coal has been significantly damaged indicated by the paramount decrease of diffusion coefficient even after the water washing. Additionally, no significant chemical coal molecular structure changes were observed with VES-based fracturing fluid treatment based on the NMR data. The fracturing fluid changes the coal pore structure mainly because the residue of the fracturing fluid enters the coal pore system, thereby adhering on the pore wall or blocking the pore throat. Most residues entered into the coal seam will be trapped in mesopores and macropores, cause serious damage to the CBM diffusivity in the coal matrix, thereby posing an adverse effect to the CBM production.



中文翻译:

VES基压裂液对煤的瓦斯吸附和扩散的作用:伊利诺伊州盆地煤的实验研究

VES基压裂液作为一种环境友好,无污染的压裂液,近年来在田间煤层气(CBM)增产中得到了逐步推广。但是,困在储层中的压裂液残留物可能会对CBM储层中的气流产生潜在的负面影响。在这项研究中,选择了基于表面活性剂的压裂液来处理煤样品。已经进行了实验室实验,包括等温甲烷吸附,低温氮吸附和13C核磁共振(NMR)测量。结果表明,甲烷的吸附能力随着清洗液的处理和残渣的增加而改变。发现吸附能力可以通过水洗来恢复。重要的是要指出,即使在水洗之后,煤的扩散性也被大大降低,这是由扩散系数的最大降低所表明的。另外,基于NMR数据,基于VES的压裂液处理未观察到明显的化学煤分子结构变化。压裂液改变了煤孔结构,主要是因为压裂液的残余物进入了煤孔系统,从而粘附在孔壁上或阻塞了孔喉。进入煤层的大多数残留物将被困在中孔和大孔中,

更新日期:2021-03-04
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