Filtration of live oil in the presence of phase transitions in a porous medium with inhomogeneous permeability

Sharafutdinov, R. F.; Bochkov, A. S.; Sharipov, A.; Sadretdinov, A. A.

doi:10.1134/s0021894417020109

Cited by 5 publications

(1 citation statement)

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“…However, due to investment, operation, and reconstruction, more practical situations are based on the existing two-stage process, making produced water filtration technology of oil field transition from stereotyping to serialization and individualization [13][14][15][16]. First, in reservoirs with different permeability, the targeted treatment of produced water with different water quality has been implemented, and attempts have been made to improve the utilization rate and operating load of the existing equipment.…”

Section: Introductionmentioning

confidence: 99%

Interception Characteristics and Pollution Mechanism of the Filter Medium in Polymer-Flooding Produced Water Filtration Process

Wang

Dang

et al. 2019

Processes

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Polymer flooding enhances oil recovery, but during the application of this technology, it also creates a large amount of polymer-contained produced water that poses a threat to the environment. The current processing is mainly focused on being able to meet the re-injection requirements. However, many processes face the challenges of purifying effect, facilities pollution, and economical justification in the field practice. In the present work, to fully understand the structure and principle of the oil field filter tank, and based on geometric similarity and similar flow, a set of self-designed filtration simulation devices is used to study the treatment of polymer-contained produced water in order to facilitate the satisfaction of the water injection requirements for medium- and low-permeability reservoirs. The results show that, due to the existence of polymers in oil field produced water, a stable colloidal system is formed on the surface of the filter medium, which reduces the adsorption of oil droplets and suspended solids by the filter medium. The existence of the polymers also increases the viscosity of water, promotes the emulsification of oil pollution, and increases the difficulty of filtration and separation. As filtration progresses, the adsorption of the polymers by the filter medium bed reaches saturation, and the polymers and oil pollution contents in the filtered water increase gradually. The concentration and particle size of the suspended solids eventually exceed the permissible standards for filtered water quality; this is mainly due to the unreasonable size of the particle in relation to the filter medium gradation and the competitive adsorption between the polymers and the suspended solids on the surface of the filter medium. The oil concentration of the filtered water also exceeds the allowable standards and results from the polymers replace the oil droplets in the pores and on the surfaces of the filter medium. Moreover, the suspended particles of the biomass, composed of dead bacteria, hyphae, and spores, have strong attachment and carrying ability with respect to oil droplets, which cause the suspended solids in the filtered water to exceed the permissible standards and oil droplets to be retained in the filtered effluent at the same time.

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Section: Introductionmentioning

confidence: 99%

Interception Characteristics and Pollution Mechanism of the Filter Medium in Polymer-Flooding Produced Water Filtration Process

Wang

Dang

et al. 2019

Processes

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Uniform flow field design in porous media filter tower and experimental verification

Mao

Lan

et al. 2021

Process Safety and Environmental Protection

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Features of formation of the temperature field in a well with a multilayer system during oil degassing

Sharafutdinov

Kanafin

2020

TSU Herald. Phys Math Model. Oil, Gas, Energy

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As is known, well thermometry is one of the main methods for diagnosing the condition of a well and formation while monitoring the development of oil and gas fields. Despite the widespread use of thermometry in the oil and gas industry, today the question of the formation of the temperature field in a well with a multilayer system under conditions of oil degassing remains poorly understood. Therefore, it is relevant to study thermohydrodynamic processes that form the temperature field in the well-reservoir system based on a mathematical model of the movement of a two-phase flow of oil and gas, taking into account oil degassing. Based on a numerical model describing the non-isothermal movement of a two-phase fluid in a well with a multi-layer system, the article discusses the problem of selecting soda oil from a well that operates two layers. The formation of the temperature field is due to the influence of the adiabatic and Joule-Thomson effects, as well as the heat of gas degassing. The system of differential equations is solved numerically, and discretization by the control volume method. The resulting system of nonlinear equations is linearized by the Newton-Raphson method, the roots of which are found by the Gauss method from the LAPACK library. The paper considers the features of temperature effects in a well with a two-layer system for various durations of pressure reduction at the wellhead, oil saturation pressure with gas, as well as the functional dependences of the relative phase permeabilities of phases on saturation. It is shown that a sharp decrease in pressure at the wellhead leads to significant cooling in the first hour of well operation. The results can be used in the planning of field geophysical studies and interpretation of the results of temperature studies of wells in the production of gas-cut oil.

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Filtration of live oil in the presence of phase transitions in a porous medium with inhomogeneous permeability

Cited by 5 publications

References 0 publications

Interception Characteristics and Pollution Mechanism of the Filter Medium in Polymer-Flooding Produced Water Filtration Process

Interception Characteristics and Pollution Mechanism of the Filter Medium in Polymer-Flooding Produced Water Filtration Process

Uniform flow field design in porous media filter tower and experimental verification

Features of formation of the temperature field in a well with a multilayer system during oil degassing

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