«Oilfield engineering»

Evaluation of thermal impact effectiveness on the Upper Jurassic oil source rocks

UDC: 622.276.1/.4:55+622.276.65
DOI: 10.33285/0207-2351-2023-8(656)-23-29

Authors:

¹ LUKOIL-Engineering, Moscow, Russia

Keywords: source suite, the Upper Jurassic deposits, synthetic oil, thermal degradation of kerogen, kerogen

Annotation:

The Upper Jurassic oil source suite of the Western Siberia is characterized by a high content of aquatic organic matter, consisting of hydrocarbons, hetero-atomic compounds and kerogen, which are present in the rock in various forms (gaseous, liquid and solid) and states (free and physically related). The oil, located mainly in thin, extended siliceous and siliceous-carbonate reservoirs of the Upper Jurassic deposits, is currently produced using vertical and horizontal wells with multi-section hydraulic fracturing of a reservoir. The development of approaches to the hydrocarbons extraction from the low-permeable high-carbon part of the studied section, which contains a huge amount of resources, is an urgent task. Currently, there exist a lot of thermal methods variations aimed at converting kerogen from the Upper Jurassic deposits, such as thermal gas treatment of the formation (including that one with the addition of water, solvent/coolant), rock heating using an electric cable or electromagnetic waves, etc. The necessary condition of the technology is the thermal effect, since the conversion of kerogen into hydrocarbons occurs only at elevated temperatures and is accompanied by a change in the porosity and permeability properties of oil source rocks.

The article presents approaches to evaluating the effectiveness of thermal treatment technology for high-carbon low-permeable rock, based on determining the amount of oil released (for example, in liters) from 1 m³ of rock and the estimated volume of rock heating. The following reservoir parameters and the results of laboratory experiments were used for calculations: rock density, organic carbon content, including pyrolyzable and non-pyrolyzable, kerogen conversion, the ratio of gaseous and liquid hydrocarbons in the composition of the reaction products formed after thermolysis of kerogen as well as the accepted conditional parameters (coverage factor, impact radius, thickness (height) of the impact zone).

Based on the results of the core previous studies of the West Siberian fields, the range of oil recovery from 1 m³ of high-carbon rock was determined, according to which it is possible to estimate the thermal treatment effectiveness on a reservoir using the lower and upper values. Due to the fact that the Upper Jurassic deposits are currently developed by horizontal wells mainly, calculations of additional oil production under thermal impact on source rocks and a sensitivity analysis of various parameters influence were carried out taking into account such a well design.

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