«Oilfield engineering»

Improving the reliability of reservoir rocks wettability determination by laboratory methods

UDC: 533.98
DOI: 10.33285/0207-2351-2023-9(657)-38-42

Authors:

¹ LUKOIL-Engineering Limited PermNIPIneft Branch Office in Perm, Perm, Russia

Keywords: petrophysics, laboratory methods, capillary impregnation, wettability, core

Annotation:

The study of reservoir rocks wettability of hydrocarbon fields is one of the main problems that should be addressed when calculating reserves and at all stages of oil and gas fields development. Wettability affects such indicators as oil and water saturation, water cut, oil recovery factors, phase permeabilities. The main group of laboratory methods that are applied for determining wettability refers to dynamic methods. They are based on the effects of core samples capillary impregnation and forced displacement of one fluid by another one. One of these methods disadvantages is the problem of capillary impregnation duration. The accepted time of capillary impregnation, both in domestic and foreign regulations as well as in guidelines, may not be enough. As a result, it is possible to obtain erroneous or incomplete data on the nature of reservoir rock wettability. Particular attention should be paid to the study of rocks with a complex non-hydrophilic type of wettability. Due to these facts, the purpose of the article is the scientific- methodological substantiation of the time criteria for conducting experiments to determine the wettability by dynamic research methods. The object of the research was carbonate deposits core samples of one of the deposits in the Timano-Pechora oil- and gas-bearing province. Based on the results of the experiments conducted, the effect of capillary impregnation time on the change in wettability parameter was assessed.

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