Prediction of gas factor taking into account gas dissolved in the water at late stages development of oil fields

Mikhaylov, V. G.; Jsc, Ufa «RN-UfaNIPIneft»; Ponomarev, A. I.; Topolnikov, A.S.

doi:10.5510/ogp20170300322

Cited by 3 publications

(3 citation statements)

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“…The dispersity of fluoropolymers in water has hindered their application in the development of oil and gas fields. 18,19 Fluoropolymers can be prepared as emulsions to improve the dispersion in the water system. 20,21 the formation channel, the wettability of the reservoir could be changed.…”

Section: Introductionmentioning

confidence: 99%

“…Fluoropolymers have very low surface free energy due to the small atomic radius of fluorine atoms and the large bond energy of the C–F bond in the structure. , Therefore, fluoropolymers are widely used in the preparation of interface materials with antiadhesion, antifriction, oil–water–gas separation, and etc. − But the preparation of fluorinated materials is also limited because of their extremely low surface free energy. The dispersity of fluoropolymers in water has hindered their application in the development of oil and gas fields. , Fluoropolymers can be prepared as emulsions to improve the dispersion in the water system. , As reversal agents, fluoropolymers are injected into the formation in the form of polymer fluids. After adsorption on the rock surface in the formation channel, the wettability of the reservoir could be changed.…”

Section: Introductionmentioning

confidence: 99%

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Fluoropolymer Microemulsion: Preparation and Application in Reservoir Wettability Reversal and Enhancing Oil Recovery

et al. 2021

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Reservoir wettability is an important factor in the process of reservoir reconstruction. Especially in hydrophilic formation, it is easy to cause a water-locked phenomenon. A new type of fluoropolymer microemulsion was prepared by emulsion polymerization, and its structure and properties were characterized. The average particle size in the prepared emulsion was about 2.0 μm. The emulsion had good stability and wettability reversal performance for the storage of 30 days. After the treatment of 2.0 wt % emulsion, the contact angle between the core and water changed from 26 to 128°, the core surface free energy decreased from 66 to 2.6 mN/m, and the saturated water imbibition amount of the core decreased from 1.38 to 0.15 g. The ability of the fluoropolymer microemulsion to enhance oil recovery was evaluated by the visual displacement experiment. The fluoropolymer microemulsion can increase the displacement efficiency by more than 10%. The wettability of the core changed from hydrophilicity to hydrophobicity, and wettability reversal was achieved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluoropolymer Microemulsion: Preparation and Application in Reservoir Wettability Reversal and Enhancing Oil Recovery

et al. 2021

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“…In the development of oil fields with waterflooding, the gas-oil ratio increases significantly [13][14][15]. It occurs due to mass conversion and transfer of APG components (methane-ethane-propane) from oil to water [16][17][18]. Such an increase of gas-oil ratio undoubtedly contributes to increase of negative influence of gas in the intake of submersible centrifugal and rod pumps, gas accumulation and pressure increase in annulus space of production wells.…”

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confidence: 99%

Development of a pump-ejector system for SWAG injection into reservoir using associated petroleum gas from the annulus space of production wells

Дроздов¹,

Gorelkina²

2022

PMI

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Implementation of SWAG technology by means of water-gas mixtures is a promising method of enhanced oil recovery. The use of associated petroleum gas as a gas component in the water-gas mixture allows to significantly reduce the amount of irrationally consumed gas and carbon footprint. Relevant task is to choose a simple, reliable and convenient equipment that can operate under rapidly changing operating conditions. Such equipment are pump-ejector systems. In order to create water-gas mixture it is proposed to use associated gas from the annulus space. This solution will reduce the pressure in the annulus space of the production well, prevent supply disruption and failure of well equipment. The paper presents a principal technological scheme of the pump-ejector system, taking into account the withdrawal of gas from the annulus space of several production wells. The layout of the proposed system enables more efficient implementation of the proposed technology, which expands the area of its application. Experimental investigations of pressure and energy characteristics of the ejector have been carried out. Analysis of the obtained data showed that it was possible to increase the value of maximum efficiency. The possibility of adapting the system in a wide range of changes in operating parameters has been established. Recommendations on selection of a booster pump depending on the values of working pressure and gas content are given.

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Compressibility factor of natural gas determination by means of molecular dynamics simulations

Moiseeva

Malyshev

2019

AIP Advances

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Forecasting of phase behavior and PVT-properties of natural gas is one of the major tasks during the developing and operation of gas and gas condensate fields. Each stage – from an exploration to transportation and storage of gas is followed by continuous changes of thermobaric conditions. This causes changes of thermodynamic properties of gas, one of which is compressibility factor. The comparative study of the existing theoretical methods of compressibility factor determination is given in the presented work: based on the equation of state and empirical correlations. Besides, the alternative approach based on molecular dynamics simulations with the Lennard-Jones potential is offered. The analysis of the received results is carried out on the basis of 165 experimental data for 5 various mixtures of natural gas covering temperatures of 310.9 – 344.4 K and pressure range of 7.074 - 48.443 MPa. The statistical analysis shows that the molecular dynamics method shows the minimum error and is suitable for determination of z-factor of mixtures with methane content more than 90%. For mixtures with the high content of carbon dioxide the Peng-Robinson equation of state with shift-parameter shows the minimum error.

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Prediction of gas factor taking into account gas dissolved in the water at late stages development of oil fields

Cited by 3 publications

References 1 publication

Fluoropolymer Microemulsion: Preparation and Application in Reservoir Wettability Reversal and Enhancing Oil Recovery

Fluoropolymer Microemulsion: Preparation and Application in Reservoir Wettability Reversal and Enhancing Oil Recovery

Development of a pump-ejector system for SWAG injection into reservoir using associated petroleum gas from the annulus space of production wells

Compressibility factor of natural gas determination by means of molecular dynamics simulations

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