GEOLOGICAL FACTORS INFLUENCE ON OILWELLS FLOODING AT SMALL FIELDS
Introduction. The article discusses the issue of wells flooding and rise of the oil-water contact (WOC) by the example of North Caucasus fields. Flooding character of oil fields wells is given depending on rise of oil-water contact and the position of absolute levels for lower perforation holes. Mat...
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| Main Authors: | , |
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| Format: | Article |
| Language: | Russian |
| Published: |
North-Caucasus Federal University
2022-07-01
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| Series: | Наука. Инновации. Технологии |
| Subjects: | |
| Online Access: | https://scienceit.elpub.ru/jour/article/view/31 |
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| Summary: | Introduction. The article discusses the issue of wells flooding and rise of the oil-water contact (WOC) by the example of North Caucasus fields. Flooding character of oil fields wells is given depending on rise of oil-water contact and the position of absolute levels for lower perforation holes. Materials and research methods. Field data, measurements taken in the wells of oil fields in the North Caucasus, the results of experimental and laboratory studies are used. The research methods consist in analyzing and summarizing information about the complex of reservoir hydrodynamic characteristics (for example, small oil fields in the North Caucasus), about the sources and nature of the inflow of bottom and bottom water during the operation of wells based on the study of analytical relationships between formation pressure in the hydrodynamic system, volumes of oil withdrawal and the amount of incoming formation fluid from the peripheral zone. Research results and discussion. Some processes of oil wells flooding were studied by the example of Vorobyevskaya area. The main sources of water inflow during the development of oil wells are identified. As a result of control over the development of oil wells of Vorobyevskaya area, it was established that the flow of water into the waterlogged wells occurred through vertical fracture channels. At the intersection of vertical fractures with more permeable horizontal fractures and in the presence of a pressure gradient in the bottomhole zone water began to move along the horizontal fractures to the wells with their subsequent flooding. Changes in the hydrochemical parameters of water samples taken at different dates in the wells of Vorobyevskaya area are considered. Conclusions. It has been established that the main source of water inflow during the development of the area's oil wells is formation bottom and peripheral waters which are part of the sedimentation basin of the East Stavropol Depression. In wells located inside oil-drainage line the source of water is the overlying aquifer thermal layer. The oil field is confined to a hydrodynamic trap that is it corresponds to the classical model. The structural and lithological floating oil reservoir in the northern part is controlled by the replacement of fractured reservoirs with clay mudstones, in the southwestern and eastern parts of the area with oil-water contact carried out according to the results of well testing. The mode of reservoir development during oil withdrawal at the initial stage is ensured by the elastic capacity of the hydrodynamic system and then through the introduction of peripheral and bottom formation waters. The drop in reservoir pressure in the field hydrodynamic system depends on the volume of oil withdrawal and inflow of formation water from the peripheral zone. The state of field hydrodynamic system depends on the introduction of bottom and peripheral formation waters. |
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| ISSN: | 2308-4758 |