Article

Study of capillary injection of chemicals into productive formations to increase well production

Serhii Ovetskyi, Yaroslav Yakymechko
Abstract

The study of the capillary systems of hydrocarbon reservoirs is an important and urgent task, especially in view of the large number of reservoirs that are at a late stage of production and the great prospects for the development of unconventional reservoirs, especially tight and shale reservoirs. For these reservoirs, increasing the permeability of the capillary systems allows the flow rate to be increased by 15-20%. This requires new approaches, in particular the investigation of the possibilities of additional hydrocarbon recovery using the properties of capillary systems. The aim of the research is to identify the main factors influencing the capillary system of the oil reservoir in order to increase the productivity of the well and to develop means and measures for influencing them. To this end, a system of laboratory and digital studies of capillary systems in terms of their permeability to the oil phase in various reservoirs has been used. The effect on capillary systems is considered for the purpose of increasing oil flow from rocks of different permeability based on the data obtained, which indicate improvement filtration characteristics of samples when introduced into the samples that simulate the borehole zone of the reservoir of the oil well proposed for the use of sodium soap - an increased permeability for smaller particles by 25%, for the largest - by 72%, medium - by 3%. The saturation curves of the samples also changed and in their character came as close as possible to the dynamics of average grain sizes. All the samples studied with the use of a capillary admixture show only an improvement in the characteristics of reducing fluid adhesion to the pore walls compared to the results without such impurities (by 78% for collectors of low porosity, 50% for collectors of high porosity, 41% for collectors of medium porosity). From this it can be concluded that the benefits of introducing additives to increase capillary permeability are significant for low and high porosity structures. Priority characteristics of the wellbore zone of the formation have been identified for which such treatment will be effective. The practical value of the research lies in the identification of possible factors that would allow the management of the permeability of the capillary systems of different collectors of oil fields at a late stage of operation

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Received 26.04.2023

Revised 13.07.2023

Accepted 28.08.2023

https://doi.org/10.69628/pdogf/3.2023.15
Retrieved from Vol. 23, No. 3, 2023
Pages 15-23

Suggested citation

Ovetskyi, S., & Yakymechko, Ya. (2023). Study of capillary injection of chemicals into productive formations to increase well production. Prospecting and Development of Oil and Gas Fields, 23(3), 15-23. https://doi.org/10.69628/pdogf/3.2023.15

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