Numerical evaluation of the wet combustion efficiency of the thermal gas tehnology on a 2D model

Artur M. Shakhmaev Gubkin Russian State University of Oil and Gas (National Research University) Moscow 89artur.shakhmaev@gmail.com
Yaroslav O. Simakov LLC "Petek" Moscow yaroslav.s.olegovich@gmail.com
Petr V. Pyatibratov Gubkin Russian State University of Oil and Gas (National Research University) Moscow pyatibratov.p@gmail.com
Ashot A. Mosesyan Gubkin Russian State University of Oil and Gas (National Research University) Moscow mosesyan@gmail.com
Using thermal properties of saturated steam able to accumulate more heat than the other gas agents is the main distinctive feature of the wet combustion. This feature of the steam is most widely used in such thermal methods as steam treatment, SAGD, huff-and-puff treatment. This work evaluates the efficiency of the wet combustion on a 2D model during the thermal gas technology (hereinafter - TGT) of the Bazhenov formation.
Materials and methods
CMG STARS hydrodynamic simulator allowing modeling thermal and gas oil recovery enhancement methods
Results
The efficiency of the wet combustion was evaluated during the work when implementing TGT on a 2D model. The results of the calculation illustrate advantage of the wet combustion from the point of view of the intensification of the oil in place recovery, and of the amount of the additional recovered synthetic oil as a result of the kerogen pyrolysis reaction.
Conclusions
The results of the work established that the 0.004 m3/Nm3 air-water ratio showed the best efficiency; however, considering matrix a proper modeling object, air injection will redistribute through the whole formation. As a result, the matrix temperature and everywhere may fall below the level required for the pyrolysis reaction (below 350 0С). In this case, one should consider an option to inject the air-water mixture with 0.001-0.002 m3/ Nm3 as a recommendation. Then we can be assured that the combustion front temperature will be maintained at the level required for the pyrolysis reaction, and consequentially additional production of the synthetic oil will be possible (this mechanism if one of the basic ones in the TGT process). At the same time, larger volumes of rocks will be treated due to the wet combustion mechanism. Thus, it is possible to make a conclusion that finding an optimal air-water ratio is required.
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2D модель Bazhenov formations thermal gas tehnology drained and non-drained formatio