Journal
FUEL
Volume 304, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.121355
Keywords
Sodium lauryl sulfate; Water infusion of coalbeds; Seepage coefficient; Contact angle
Categories
Funding
- National Natural Science Foundation of China [51974176, 51934004]
- Taishan Scholars Project [TS20190935]
- Shandong Provincial Colleges and Universities Youth Innovation and Technology Support Program [2019KJH006]
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The use of surfactants in coal seam water injection can enhance wetting effect but impede the seepage stage, leading to deterioration of the permeability coefficient. After the addition of surfactants, the permeability coefficient shows a rapid decrease first and then gradually stabilizes.
Coal seam water injection is a disaster prevention technology that is commonly used in the mining of underground coal resources. Surfactants are widely used in the coal industry in China to enhance the effect of coal seam water injection. Surfactants may have a potential impact on the seepage stage while enhancing wetting. In order to study the characteristics of surfactants on coal seam water injection, we adopted sodium dodecyl sulfate (SDS) as a surfactant in this study. Based on the research background of the Houwenjialiang Coal Mine in Ordos City, Inner Mongolia Autonomous Region, China, we examined the effect of the surfactant SDS on the seepage stage of coal seam water injection using a laboratory triaxial seepage system. The influence of the surfactant SDS on the coal seam water injection wetting stage was investigated with a laboratory bottom-up imbibition experiment method. The main conclusions are as follows. The addition of surface activity can enhance the wetting effect but impede the seepage stage of coal seam water injection, which deteriorates the permeability coefficient. After the addition of surfactant, the permeability coefficient shows a rapid decrease first and then gradually stabilizes. The reason for the compromise to the permeability coefficient is mainly due to the small cracks or pores caused by the adsorption of SDS, which slows down the flow of the liquid. The addition of surfactants can effectively reduce the surface tension of the liquid, minimize the contact angle, and enhance the coal seam water injection wetting stage. The research results provide valuable information for evaluating coal seam water injection effect and the development of water injection technology.
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