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| Investigation on meso-characteristics of in-situ pyrolysis of oil shale by injecting steam#br# |
| WANG Lei1，2，3，ZHAO Yangsheng1，2，3，YANG Dong2，3#br# |
| (1. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Key Laboratory of In-situ Property Improving Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；3. The In-situ Steam Injection Branch of State Center for Research and Development of Oil Shale Exploitation，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China) |
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Abstract In order to study the micro-structure of rock mass and to evaluate the pyrolysis efficiency of oil shale by in-situ steam injection，the pore and fracture parameters of oil shale after pyrolysis were tested by mercury injection test and micro-CT，and the temperature evolution characteristics and oil production of oil shale under different heating modes were analyzed and discussed by numerical simulation. The results show that，after pyrolysis，the effective porosity of oil shale is at least 12.2 times of that of natural oil shale，and the structure of pores with smaller tortuosity and larger specific area，being mainly capillary pores，is changed fundamentally. After pyrolysis，the internal fractures of oil shale are mainly micro-fractures，and the fracture number of the samples is between 185 and 293. Under the action of high temperature steam，there is obvious thermal cracking in the oil shale. In the process of oil shale pyrolysis by steam injection，significant fracture of the bedding plane of the oil shale occurs，forming a fracture plane through the whole three-dimensional space and hence providing a good path for pyrolysis and product migration. It is also found that the efficiency of oil shale pyrolysis by steam injection is much higher than that of conduction heating. When the pyrolysis time is 19 months，the effective pyrolysis area of the oil shale can reach 22.4 times of conduction heating and the oil production of oil shale pyrolysis by steam injection is much higher than that by conduction heating. The experimental test and numerical simulation results show that the technology oil shale pyrolysis by in-situ steam injection is efficient and feasible.
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2020, Vol. 39 
