Investigations on the relationship among the porosity, permeability and pore throat size of transition zone samples in carbonate reservoirs using multiple regression analysis, artificial neural network and adaptive neuro-fuzzy interface system

Adegbite, Jamiu Oyekan; Belhaj, Hadi; Bera, Achinta

doi:10.1016/j.ptlrs.2021.05.005

Cited by 24 publications

(11 citation statements)

References 26 publications

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“…The oil-water transition zone (OWTZ) in a petroleum reservoir is the zone below the main oil leg where the saturation of water progressively increases from an irreducible value to 100% (Adegbite et al, 2021). The thickness of this transition zone is dependent on several properties including the hydrocarbon density, the reservoir pore sizes and distribution etc., and can range from a few metres to several hundreds of metres (Bera and Belhaj, 2016;Adegbite et al, 2021). In the main oil leg, only immovable water exists.…”

Section: Introductionmentioning

confidence: 99%

High temperature susceptibility measurements: A potential tool for the identification of oil-water transition zone in petroleum reservoirs

2022

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Determining the position and thickness of the oil-water transition zone (OWTZ) in hydrocarbon reservoirs is important to reserve estimation and production planning. This paper describes a magnetic method of identifying this zone. High temperature susceptibility (HT-χ) measurements on core samples from Paleogene reservoirs of the UK Central North Sea revealed distinct signatures around the oil water interface. Rapid increases in susceptibilities at temperatures <250°C were observed for samples around the oil water interface unlike the main oil leg where alteration involving increase in susceptibility occurred at significantly slower rates and higher temperatures. The HT-χ data together with Mössbauer measurements revealed that the variation in alteration characteristics is due to the increasing concentration of hexagonal pyrrhotite and/or lepidocrocite around the oil water interface. Hexagonal pyrrhotite was identified in reservoirs existing at temperatures of <80°C, while lepidocrocite dominated the signature around the contact of deeper reservoirs. These observations suggest that the precipitation of hexagonal pyrrhotite is related to OWTZ centred biogenic activities i.e., biodegradation. The dominance of lepidocrocite in deeper diagenetic settings has been related to hydrolysis of hydrocarbon at the oil water interface, together with cessation of biogenic activities.

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Section: Introductionmentioning

confidence: 99%

High temperature susceptibility measurements: A potential tool for the identification of oil-water transition zone in petroleum reservoirs

2022

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“…In addition, there is also a multiple regression analysis that discusses the linear dependence of multiple independent variables and multiple dependent variables, which is called the multiple multiple regression analysis models (or simply many-to-many regression) [23]. Usually, multiple factors affect the dependent variable, and the problem that multiple independent variables affect one dependent variable can be solved by multiple regression analysis [24]. For example, economic knowledge tells us that in addition to commodity price P, commodity demand Q is also affected by factors such as the price of substitutes, the price of complementary products, and consumer income, and even includes the quality variable of commodity brand (Brand Quality variables cannot be measured numerically, and dummy variables need to be introduced into the model).…”

Section: Cost Control Measures At the Completion Stagementioning

confidence: 99%

Cost Management and Forecasting Method for the Whole Life Cycle of Water Conservancy Projects Based on Multiple Regression Analysis

2022

Scientific Programming

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The water conservancy project is an important livelihood engineering project, and it is also an important factor to ensure the living water supply, power supply stability, and economic development of the regional population. Therefore, the management of water conservancy projects is particularly important. The core management content is cost control, which can maximize the benefits of the project and avoid the waste of investors’ funds. This study studies the whole process control of water conservancy project cost, explains the problems existing in the current domestic water conservancy project cost control, and finally expounds on the whole process control measures, in order to provide a reference for related work. In this study, SPSS software is mainly used to establish a multiple linear regression model to analyze the influencing factors of water conservancy projects. Through the method of model solving, the relationship between hydraulic engineering and various variables is analyzed, and the multi-linear verification is improved, so as to further test the model, optimize the model, and finally manage and predict it accurately.

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“…In complex porous media, the pore geometry will affect the apparent wettability [15]. The reservoir rock is characterized mainly via X-ray tomography and scanning electron microscopy methods to obtain characteristics of the void space such as the facies, the pore throat size, and the structure heterogeneity, which has a significant impact on the multiphase flow within porous media [16][17][18][19]. To mobilize the residual oil in the void space, it is necessary to study the capillary effect based on the structure of the void space.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Capillary Barrier on Water–Oil Movement in Water Flooding

Zhou

et al. 2022

Applied Sciences

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Water flooding technology is widely used to improve oil recovery efficiency in oilfields. The capillary barrier effect induced by the complex pore structures in the reservoir rocks is a crucial reason for the trapping of a great deal of residual oil in oil reservoirs after water flooding. However, the formation condition along with the effect on the recovery rate of the capillary barrier under different wettability conditions should be investigated further. To bridge the gap between the microscopic mechanism of the capillary barrier effect and the macroscopic mechanism of oil displacement efficiency, a simple conceptual capillary model is constructed to obtain the formation conditions of the capillary barrier using the analysis method, and its influence on macroscopic oil displacement efficiency in the porous media model with an opening angle of 45° is systematically investigated in this study using direct numerical simulations (DNS) coupled with the volume of fluid method. The results showed that the capillary barrier effect plays a significant role in the formation of the residual oil in the reservoir rock and the contact angle and the opening angle are the primary factors for the formation of the capillary barrier. The capillary force is the driving force when the oil–water interface advances in the throat channel under water-wet conditions, while the capillary force hinders the movement of oil–water movement when the liquid flows out of the throat channel and when θ + β > 90o. Furthermore, the highest oil displacement efficiency is achieved at the intermediate capillary number and in the case that the minimum conditions of occurrence of the capillary barrier phenomenon are satisfied. This is of great significance for controlling the optimized contact angle to further enhance the oil recovery rate of current oil reservoirs using waterflooding technology.

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Investigations on the relationship among the porosity, permeability and pore throat size of transition zone samples in carbonate reservoirs using multiple regression analysis, artificial neural network and adaptive neuro-fuzzy interface system

Cited by 24 publications

References 26 publications

High temperature susceptibility measurements: A potential tool for the identification of oil-water transition zone in petroleum reservoirs

High temperature susceptibility measurements: A potential tool for the identification of oil-water transition zone in petroleum reservoirs

Cost Management and Forecasting Method for the Whole Life Cycle of Water Conservancy Projects Based on Multiple Regression Analysis

Investigation of the Effect of Capillary Barrier on Water–Oil Movement in Water Flooding

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