Science and technological developments: article

ESTIMATES OF COMPRESSIBILITY OF THE PORE SPACE OF THE UVYAZOVSKIY AGS RESERVOIRS
V.S. Zhukov
D.K. Kuzmin
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
Journal: Science and technological developments
Tome: 101
Number: 3
Year: 2022
Pages: 5-19
UDK: 553.98.2
DOI: 10.21455/std2022.3-2
Keywords: porosity, volumetric compressibility of pores, subsidence of the ground surface, effective pressure, reservoir conditions
Аnnotation: The results of experimental studies of the effect of alternating changes in reservoir pressure on the volumetric compressibility of gas storage reservoirs have been reviewed. Several approaches to the estimation of volumetric compressibility are considered: integral, differential-differential and differential-discrete, which differ in their choice of the interval of effective pressure changes. It is shown that different approaches give different estimates of the volume compressibility of the pore space. It is established that the application of the differentialsampling approach allows the most adequate estimation of the pore compressibility in the process of gas injection and circulation. Specific petrophysical parameters of the gas storage reservoir have been considered and, on their basis, estimates of the coefficient of volumetric compressibility of the pore space have been obtained. A methodology has been developed and practically tested to estimate changes in vertical surface displacements of an underground gas storage reservoir, which takes into account actual changes in porosity and compressibility of gas reservoirs depending on the selected operating mode. Using the developed mathematical models, the estimation of the maximum amplitude of subsidence of the Uvyazovskoye underground gas storage surface during the simulation of gas injection and withdrawal, which reaches 61 mm when the reservoir pressure changes by ±5.0 MPa, has been calculated according to this methodology.
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