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Evaluation of gas losses during storage in aquifers of the Western Doniets Basin

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Category: Mining
Last Updated on 25 December 2013
Published on 19 December 2012
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 Authors:

I.A. Sadovenko, Dr. Sci. (Tech.), Professor, State Higher Educational Institution "National Mining University", Professor of the Department of Hydrogeology and Engineering Geology, Dnipropetrovsk, Ukraine

A.V. Inkin, Cand. Sci. (Tech.), Associate Professor, State Higher Educational Institution "National Mining University", Doctoral Student of the Department of Hydrogeology and Engineering Geology, Dnipropetrovsk, Ukraine

Z.N. Yakubovskaya, Cand. Sci. (Tech.), Ukrainian State University of Chemical Technology, Senior Lecturer of the Department of Physics, Dnipropetrovsk, Ukraine

N.A. Maksimova-Gulyayeva, Cand. Sci. (Tech.), State Higher Educational Institution "National Mining University", Senior Lecturer of the Department of Hydrogeology and Engineering Geology, Dnipropetrovsk, Ukraine

Abstract:

Purpose. To assess the impact of capillary forces, diffusion and gravity on the formation of in-situ gas losses during the operation of the aquifer gas storage.

Methodology. A technique based on the analytical modeling of the dynamics of gas-contact, and the calculation of losses due to gas diffusion, dissolution and cross-flow casing has been developed and applied. It allows us to estimate the total irretrievable loss of gas at the all stages of storage.Verification of the model has been done for the mining and geological conditions of Leventsovskaya structure of the Western Donets Basin.

Findings. We specified the form of gas-water contact depending on the depth and the radius within four weeks after the start of gas injection into the aquifer.The loss of gas during one working cycle of the gas storage facility due to diffusion and dissolution constitute 1.76% of its active volume. Leakage of gas from the reservoir through the cement ring is estimated in the range 4-13·10-6 m3/s, and within the annular channel reaches 1-7·10-3 m3/s. Its maximum values correspond to the periods of pumping of the gas in the storage and minimum values correspond to the periods of storage and gas extraction. The total flow of gas through the casing annulus during pumping can exceed 600 m3/day, the rest of the time it makes about 120 m3/day, which gives the total annual loss of 103.34 thousand m3/year or 0.07% of the active volume of stored gas.

Originality. By means of modeling the influence of capillary forces, diffusion and gravity on the formation of in-situ gas losses at various stages of exploitation of the aquifer gas storage has been estimated.

Practical value. We have found out that the total irretrievable loss caused by the dissolution of the gas, its flow through the collector and the roof space of the well casing does not exceed 4% of the accumulated gas.This amount of loss is acceptable, taking into account the world experience of underground storage facilities.

 

References: 
 
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