International Journal of Earth Sciences and Engineering

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In light of the pilot project on the in situ conversion of the Nong’an oil shale and the actual geological condition of the area, this study proposed a new in situ pyrolysis method that combines fracturing and nitrogen injection and introduced the corresponding ground equipment. In building the mathematical model, the technology parameters related to the in situ pyrolysis method were optimized through numerical simulation. This optimization was aimed at reaching the highest possible heat transfer efficiency between the high-temperature nitrogen and the oil shale layer. Simulation results revealed an optimal nitrogen injection flow of 30 m3/h and a high energy utilization ratio that can reach 62.7%. Heating time was set to 125 d to sufficiently pyrolyze the oil shale stratum between the injection-heating well and the production well.

Keywords

Oil Shale, In Situ Pyrolysis, High-Temperature Nitrogen, Injection Flow Rate, Heat Transfer Efficiency.
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