Use of nonlinear seepage for hydrodynamic modeling of low permeable reservoirs of the Achimov deposits
UDC: 622.276.038:532.5
DOI: 10.33285/1999-6934-2023-6(138)-53-58
Authors:
NEVMERZHITSKY YAN V.
1,
KUZMINA TATYANA V.2,
VERSHININA IRINA V.2,
VINOGRADOV KIRILL E.3
1 LUKOIL-Engineering, Moscow, Russia
2 KogalymNIPIneft, Tyumen, Russia
3 Tyumen State University, Tyumen, Russia
Keywords: low permeable reservoir, nonlinear flow, hydrodynamic study, seepage law
Annotation:
Hydrodynamic modeling of low-permeable reservoirs (with an absolute permeability of less than 2 mD) is a complex non-standard problem. Fluid flow occurs in difficult conditions, which is associated with the rock matrix characteristics and its interaction with fluids that saturate the pore space. In the absence of core experiments, the presence of non-linear flow can be confirmed by interpreting wells test results. It is also possible to obtain an analytical solution based on the analysis of well production. One of the simplest seepage laws, which is widely used in conditions of deviation from the linear Darcy law, is the law with the threshold pressure gradient. When selecting parameters of the nonlinear seepage law for matching the results of a long-term monitoring, an approximate value of the threshold gradient of 0,1 atm/m was obtained. Three input parameters were used for proper matching of hydrodynamic model (HDM): the initial pressure gradient GP0, the maximum pressure gradient GP1 and the flow multiplier F0 (equals to the ratio of oil mobilities at different pressure drops). In the presented article, the values of the initial and maximum pressure gradients GP0 and GP1 were close to the threshold pressure gradient γ, which made it possible to set a piecewise linear seepage law. The above-mentioned approach allows justifying a rapid decline of production rates, including horizontal wells as well as obtaining more reliable bottomhole pressure settings. However, the application of nonlinear seepage laws can be attributed to a low-permeable reservoir for 1-phase oil flow; for the joint flow of oil and water, the application of this approach is difficult.
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