«Oilfield engineering»

ANALYSIS OF PETROPHYSICAL AND FILTRATION-CAPACITIVE PROPERTIES OF UNDER-GAS-CAP DEPOSITS OF THE PERM KAMA REGION FIELDS

UDC: 622.276.031:532.51(1-04)ГНК+622.276.6
DOI: 10.33285/0207-2351-2021-4(628)-37-42

Authors:

¹ LUKOIL-Engineering Limited PermNIPIneft Branch Office in Perm, Perm, Russian Federation
² Ufa State Petroleum Technological University, Ufa, Russian Federation

Keywords: oil-and-gas deposit, gas cup, oil rim, oil displacement, correlation coefficient, Oil mobility, permeability, multiplicity of increase of the flow rate

Annotation:

Over the past two decades, the structure of oil and gas reserves in Russia has undergone significant changes: with a general increase in reserves, a significant increase in the share of hard-to-recover reserves (HTRR) is observed. According to the existing classification, the sub-gas zones of a two-phase type deposits are one of the main subgroups. The paper assesses the current state of the reserves of the sub-gas deposits of the Perm Kama region, analyzes the distribution of porosity and permeability of the productive formations of the Low and Middle Carboniferous age. Viscosity values of saturating oil and related parameters such as mobility, displacement coefficient are considered. The sub-gas deposits of the Perm Territory are grouped by their belonging to coeval deposits; the sensitivity of the displacement coefficient changes to the changes in permeability and mobility is estimated. In order to identify the characteristic features and determine the nature of the change in the filtration-capacitive properties, the petrophysical and hydrodynamic characteristics are compared with uniform layers of small deposits of high-viscosity oil on the western slope of the South Tatar arch. The base of actually carried out geological-technical measures (GTM) aimed at increasing the mobility is analyzed. The multiplicity of increase in oil production rate after the use of geological-technical measures was evaluated for the selected groups of objects. Based on the obtained dependences of the displacement coefficient on mobility as well as taking into account the analysis of the results of the performed geological-technical measures, conclusions are drawn about the effectiveness of the application of enhanced oil recovery methods aimed at increasing the mobility of reservoir fluids. The results and conclusions are aimed at improving the efficiency of regulation of gas and oil fields development in the Perm Territory, selection and justification of geological-technical measures.

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