An integrated linear/non-linear flow model for the conduit-fissure-pore media in the karst triple void aquifer system

A non-linear flow model that couples three flow types is built based on flow transition to investigate the flow behavior of water inrush induced by KCC.

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Study on the Flow Characteristics of Shengli Oilfield Super Heavy Oil

The Open Fuels & Energy Science Journal ◽

10.2174/1876973x01710010069 ◽

2017 ◽

Vol 10 (1) ◽

pp. 69-78 ◽

Cited By ~ 1

Author(s):

Wang Shou-long ◽

Li Ai-fen ◽

Peng Rui-gang ◽

Yu Miao ◽

Fu Shuai-shi

Keyword(s):

Pressure Drop ◽

Pressure Gradient ◽

Heavy Oil ◽

Flow Characteristics ◽

Fluid Viscosity ◽

Linear Flow ◽

Start Up ◽

Non Linear ◽

Core Permeability ◽

Velocity Pressure

Objective:The rheological properties of oil severely affect the determination of percolation theory, development program, production technology and oil-gathering and transferring process, especially for super heavy oil reservoirs. This paper illustrated the basic seepage morphology of super heavy oil in micro pores based on its rheological characteristics.Methods:The non-linear flow law and start-up pressure gradient of super heavy oil under irreducible water saturation at different temperatures were performed with different permeable sand packs. Meanwhile, the empirical formulas between start-up pressure gradient, the parameters describing the velocity-pressure drop curve and the ratio of gas permeability of a core to fluid viscosity were established.Results:The results demonstrate that temperature and core permeability have significant effect on the non-linear flow characteristics of super heavy oil. The relationship between start-up pressure gradient of oil, the parameters representing the velocity-pressure drop curve and the ratio of core permeability to fluid viscosity could be described as a power function.Conclusion:Above all, the quantitative description of the seepage law of super heavy oil reservoir was proposed in this paper, and finally the empirical diagram for determining the minimum and maximum start-up pressure of heavy oil with different viscosity in different permeable formations was obtained.

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Conceptual and Mathematical Modeling of a Coastal Aquifer in Eastern Delta of R. Nestos (N. Greece)

Hydrology ◽

10.3390/hydrology8010023 ◽

2021 ◽

Vol 8 (1) ◽

pp. 23

Author(s):

Ioannis Gkiougkis ◽

Christos Pouliaris ◽

Fotios-Konstantinos Pliakas ◽

Ioannis Diamantis ◽

Andreas Kallioras

Keyword(s):

Mathematical Modeling ◽

Groundwater Flow ◽

Coastal Aquifer ◽

Flow Model ◽

Meteorological Data ◽

Field Measurements ◽

Groundwater Flow Model ◽

Aquifer System ◽

Geophysical Surveys ◽

The Mathematical Model

In this paper, the development of the conceptual and groundwater flow model for the coastal aquifer system of the alluvial plain of River Nestos (N. Greece), that suffers from seawater intrusion due to over-pumping for irrigation, is analyzed. The study area is a typical semi-arid hydrogeologic environment, composed of a multi-layer granular aquifers that covers the eastern coastal delta system of R. Nestos. This study demonstrates the results of a series of field measurements (such as geophysical surveys, hydrochemical and isotopical measurements, hydro-meteorological data, land use, irrigation schemes) that were conducted during the period 2009 to 2014. The synthesis of the above resulted in the development of the conceptual model for this aquifer system, that formed the basis for the application of the mathematical model for simulating groundwater flow. The mathematical modeling was achieved using the finite difference method after the application of the USGS code MODFLOW-2005.

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