«Equipment and technologies for oil and gas complex»

Fluid selection for cyclic injection into the Upper Jurassic deposits using a downhole heater to enhance oil recovery

UDC: 622.276.43"5"
DOI: 10.33285/1999-6934-2022-6(132)-63-68

Authors:

¹ LUKOIL-Engineering, Moscow, Russia

Keywords: cyclic treatment, the Upper Jurassic deposits, downhole heater, synthetic oil, thermal destruction of kerogen, technological potential, pentane-hexane mixture

Annotation:

In order to select a technology for increasing oil recovery in the Upper Jurassic deposits, a series of long-term field [7, 8] and laboratory experiments on the core was carried out under the condition of thermal impact on the rocks. The results obtained are comprehensively analyzed and reproduced on a sectoral hydrodynamic model, which is reflected in the articles [1, 3] devoted to the processes of kerogen conversion into synthetic hydrocarbons and their extraction by a hydrocarbon solvent, namely a pentane-hexane mixture (PHM). A further direction of the research was the calculations that allow predicting the volume of synthetic hydrocarbons that can be obtained as a result of the conversion of kerogen from permeable and impermeable Upper Jurassic rocks. To solve the problem, calculations were carried out on the hydrodynamic model of the Upper Jurassic deposits, "tuned" to the results of laboratory experiments on the core. The sensitivity analysis was carried out on a sector model that reflects the process of downhole heating of the Upper Jurassic deposits with the extraction of the generated synthetic oil by a hydrocarbon solvent. As part of the calculations, several variants of injected fluids were tested. The analysis of the results showed that the optimal injected fluid is the pentane-hexane mixture (PHM). In combination with rock heating, it shows the best effect in terms of oil production enhancment.

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