«Geology, geophysics and development of oil and gas fields»

Faults interpretation at the oil fields by wells-test data in the presence of hydrodynamic modeling errors. Part 5. Errors of hydraulic conductivity evaluation

UDC: 622.276.1/.4.001.57
DOI: -

Authors:

¹ Scientific Research Institute for System Analysis of National Research Centre "Kurchatov Institute", Moscow, Russia
² Euroasian Union of Subsoil Use Experts, Moscow, Russia

Keywords: wells hydrodynamic studies, faults, impermeable fault, high permeable fault, faults filtration characteristics determination, errors of hydraulic conductivity determination, errors of well flow rate determination, errors of a formation volumetric factor determination

Annotation:

Based on the data of computer hydrodynamic modeling, the possibility of faults filtration characteristics assessment of an oil field is considered by registration of a pressure stabilization curve (PSC) data during the start-up of putting an exploratory well into operation which is located near the fault. The solution is found by comparing the PSC obtained experimentally and calculated for different filtration characteristics of the fault using the known reservoir parameters. The influence of the error of hydraulic conductivity estimation on the result of the abovementioned comparison has been studied.

Regardless of the error of hydraulic conductivity estimation, if wells production rate measurements are provided with maximum accuracy and frequency, the fault under investigation can be referred to one of three classes: i) impermeable screen; ii) highly permeable channel of a hundred and more times permeability higher than that of the formation permeability; iii) channel with permeability value in-between its characteristic levels of classes i) and ii).

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