Fault interpretation at the oil fields by wells-test data in the presence of hydrodynamic modeling errors. Part 6. The combined impact of random errors in input values for modeling
UDC: 622.276.1/.4.001.57
DOI: -
Authors:
YUDIN V.A.
1,
AFANASKIN I.V.2,
EFIMOVA N.P.1,
SHTEINBERG YU.M.1,
VOLPIN S.G.1
1 Scientific Research Institute for System Analysis of the National Research Centre "Kurchatov Institute", Moscow, Russia
2 Almetyevsk State Technological University "Petroleum Higher School", Almetyevsk, Russia
Keywords: wells hydrodynamic studies, faults, impermeable fault, high permeable fault, faults filtration characteristics determination, random errors in formation parameters estimation
Annotation:
Possibility of fault determination and assessing its filtration characteristics at the oil field by wells-test data is investigated. Investigated well was located near the fault. The problem was solved by comparison of experimental wells-test data with result of computer hydrodynamic modeling ("testing curves"). Usually in hydrodynamic modeling input parameters determined by nonhydrodynamic methods are used. The combined impact of random errors in input parameters’ estimation on the result of such comparison was investigated. Six parameters were considered: well flow rate, effective thickness, viscosity, porosity, pore and oil compressibility coefficients. Probability distributions of random errors in these parameters’ estimation were obtained in previous author’s works. The "testing curves" were calculated in a plane two-dimension geometry for four basing formation models: homogeneous (without fault); homogeneous with impermeable screen; homogeneous with channel which permeability is 10 or 100 times higher than formation one. It was shown that assessing fault filtration characteristics by such approach theoretically is possible but seems labor-consuming and inefficient. More effective might be an alternative approach with minimum usage of input parameters, determined by nonhydrodynamic methods.
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