NEW TECHNIQUE FOR TESTING (STUDYING) GAS AND GAS CONDENSATE WELLS BASED ON SELF-SIMILAR MODES OF NON-STATIONARY ISOTHERMAL NONLINEAR FILTRATION
UDC: 622.279.5.001.42
DOI: 10.33285/0207-2351-2021-5(629)-56-64
Authors:
GRIGULETSKY VLADIMIR GEORGIEVICH1,
SAVEL′EV YURY PETROVICH2
1 National University of Oil and Gas "Gubkin University", Moscow, Russian Federation
2 Baltic State Technical University "VOENMEH" named after D.F. Ustinov, Saint-Petersburg, Russian Federation
Keywords: reservoir parameters, reservoir transmissibility factor, piezo conductivity, productivity, gas flow rate, formation pressure, WELL BOTTOM PRESSURE, nonlinear filtration law, pressure build-up curve
Annotation:
The object of the research is gas and gas condensate wells. The article considers the determination of the reservoir properties of pro-ductive formations based on the use of field experimental results of gas-dynamic tests of wells in stationary and non-stationary modes (flow rate - pressure in the well bottom) as boundary conditions when solving the equations of underground fluid dynamics. Numerical modeling is carried out on the basis of a joint solution of the non-stationary continuity equation and the non-stationary analogue of the Forchheimer's equation for the radial pressure gradient at flat-radial filtration. For an isothermal filtration process, mathematical modeling means solution of a seven-point boundary value problem for a system of ordinary differential equations of the sixth order. As a result, the reservoir properties were determined and, on their basis, the regularities of the flow rate change over time were re-vealed at the given well bottom pressure isobars.
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