Emulsions generation in void space of the micromodel, their rheological properties

2011 ◽  
Vol 8 (1) ◽  
pp. 92-107
Author(s):  
A.T. Akhmetov ◽  
O.B. Sobanova ◽  
S.P. Sametov
Keyword(s):  
Rheological Properties ◽  
Oil Recovery ◽  
Pore Space ◽  
Decisive Role ◽  
Void Space ◽  
Well Production ◽  
Low Viscosity ◽  
Wide Range ◽  
Water Cut ◽  
Surfactant Composition

When afraction of scavenger petroleum reserves is steadily growing the use of methods for oil recovery increasing and intensifying of oil fields development plays a decisive role in maintaining the level of oil production. One of the methods used to increase oil recovery by isolating water inflows is the injection of a surfactant composition on a hydrocarbon base, SNPCH-9633 reagent. The action of the reagent is based on the formation in washed zones of of highly viscous gel-like W/O emulsions due to the crushing of aqueous phasedroplets. Thus W/O emulsion generated in the pore space of the formationblocks the water-saturated interlayers which leads to a reduction in water cut of the produced well production by 10-30% depending on the application conditions. The method is selective technological and easy to implement. The reagent SNPCH-9633 has a low viscosity and does not change its properties when stored over a wide temperature range for a long time. In this work using the visualization methods the features of emulsion generation during water and reagent movement in a porous structure, the manifestation of the dynamic blocking phenomenon and the rheological properties of emulsions in a wide range of aqueous phase concentrations are studied.

scholarly journals Improving efficiency of oil recovery and finding a source of watering in multi-zone deposits by geochemical methods of research

Georesursy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 93-97
Author(s):  
Maria S. Shipaeva ◽  
Ilyas A. Nuriev ◽  
Nikolay V. Evseev ◽  
Timur R. Miftahov ◽  
Vladislav A. Sudakov ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Produced Water ◽  
Element Composition ◽  
Geochemical Composition ◽  
Well Production ◽  
Quantitative Characteristics ◽  
Production Wells ◽  
Macro Element ◽  
Water Cut ◽  
Geochemical Studies

One of the strategic ways in the development of multilayer fields is to identify the source of water inflow into the well production and, as a result, to eliminate it with subsequent optimization of the production of non-watered formations. A method for assessing the degree of water cut in formations based on the quantitative characteristics of the composition of the produced water is proposed in this article. The study of a wide collection of produced water samples made it possible to trace the change in its geochemical composition depending on the age of formation of the reservoir in the Volga-Ural region.The microelements and macro element composition of water, as well as its isotopic composition were investigated. The water of different layers differs in some of the elements, which are called «key elements». Using the methods of mathematical statistics at 2 reservoir objects operated by a common filter, the incoming water was divided into fractions depending on the geochemical composition. It is shown which of the layers has more water out. The feasibility of carrying out these geochemical studies was confirmed by blocking one of the production wells operating in 2 layers, the most watered interval according to geochemical studies, as a result of which the water cut of the well production decreased from an average of 75% to 4% and is observed for several months, the oil production rate increased from 1–2 t/day to 2.5–3 t/day and remains at a constant level.

scholarly journals New information about the mechanism of oil displacement from productive reservoirs using flow control technologies

2020 ◽  
Vol 177 ◽  
pp. 01012
Author(s):  
Rustam Mukhametshin ◽  
Gulnara Kvon
Keyword(s):  
Oil Recovery ◽  
Experimental Studies ◽  
High Water ◽  
High Viscosity ◽  
Oil Displacement ◽  
Low Viscosity ◽  
Stage Of Development ◽  
Wide Range ◽  
Production Wells ◽  
Control Technologies

The article is devoted to improving the efficiency of methods application to increase oil recovery of deposits that are at the final stage of development. This stage is characterized by a high degree of waterlogging of reservoirs and extracted products. From a wide range of chemical methods for increasing oil recovery in Russian oil deposits, flow-regulating (flow-deflecting) technologies have become widespread. The article analyzes the results of purposeful use of thickened water for the completion of reserves of already flooded sandstone layers. Experimental studies were performed on two specially created five-point elements in the experimental sections of the Romashkinskoye deposit. To monitor the process of low-viscosity and high-viscosity oil displacement the following methods were used: a) intake, monitoring and production wells, in which the interval of productive horizons are lined with fiberglass pipes; b) method of high-frequency resistivity (technology of "VNIIneftepromgeophysics" Institute). The studies performed in the monitoring mode showed that, along with the increase in reservoir coverage by flooding at the macro level, there is also a displacement of part of the capillary-trapped oil in the already flooded layers’ intervals, that is, at the level of micro-uniformity of the porous medium. The paper concludes on the effectiveness of using flow-regulating technologies in conditions of high water availability of development objects.

Experimental Study of Microgel Conformance-Control Treatment for a Polymer-Flooding Reservoir Containing Superpermeable Channels

SPE Journal ◽  
2021 ◽  
pp. 1-13
Author(s):  
Yang Zhao ◽  
Jianqiao Leng ◽  
Baihua Lin ◽  
Mingzhen Wei ◽  
Baojun Bai
Keyword(s):  
Polymer Solution ◽  
Oil Recovery ◽  
Polymer Flooding ◽  
Control Treatment ◽  
Void Space ◽  
Sweep Efficiency ◽  
Microgel Particles ◽  
Water Cut ◽  
Preformed Particle Gels ◽  
Bypassed Oil

SummaryPolymer flooding has been widely used to improve oil recovery. However, its effectiveness would be diminished when channels (e.g., fractures, fracture-like channels, void-space conduits) are present in a reservoir. In this study, we designed a series of particular sandwich-like channel models and tested the effectiveness and applicable conditions of micrometer-sized preformed particle gels (PPGs, or microgels) in improving the polymer-flooding efficiency. We studied the selective penetration and placement of the microgel particles, and their abilities for fluid diversion and oil-recovery improvement. The results suggest that polymer flooding alone would be inefficient to achieve a satisfactory oil recovery as the heterogeneity of the reservoir becomes more serious (e.g., permeability contrast kc/km > 50). The polymer solution would vainly flow through the channels and leave the majority of oil in the matrices behind. Additional conformance-treatment efforts are required. We tried to inject microgels in an attempt to shut off the channels. After the microgel treatment, impressive improvement of the polymer-flooding performance was observed in some of our experiments. The water cut could be reduced significantly by as high as nearly 40%, and the sweep efficiency and overall oil recovery of the polymer flood were improved. The conditions under which the microgel-treatment strategy was effective were further explored. We observed that the microgels form an external impermeable cake at the very beginning of microgel injection and prevent the gel particles from entering the matrices. Instead, the microgel particles could selectively penetrate and shut off the superpermeable channels under proper conditions. Our results suggest that the 260-µm microgel particles tested in this study are effective to attack the excessive-water-production problem and improve the oil recovery when the channel has a high permeability (>50 darcies). The gels are unlikely to be effective for channels that are less than 30 darcies because of the penetration/transport difficulties. After the gels effectively penetrate and shut off the superpermeable channel, the subsequent polymer solution is diverted to the matrices (i.e., the unswept oil zones) to displace the bypassed oil. Overall, this study provides important insights to help achieve successful polymer-flooding applications in reservoirs with superpermeable channels.

Use of Cosolvents To Improve Alkaline/Polymer Flooding

SPE Journal ◽  
2014 ◽  
Vol 20 (02) ◽  
pp. 255-266 ◽  
Author(s):  
R.. Fortenberry ◽  
D.H.. H. Kim ◽  
N.. Nizamidin ◽  
S.. Adkins ◽  
G.W.. W. Pinnawala Arachchilage ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Mobility Control ◽  
Crude Oils ◽  
Heavy Oils ◽  
Low Viscosity ◽  
Low Concentrations ◽  
Wide Range ◽  
Acidic Components

Summary We have found that the addition of low concentrations of certain inexpensive light cosolvents to alkaline/polymer (AP) solutions dramatically improves the performance of AP corefloods in two important ways. First, the addition of cosolvent promotes the formation of low-viscosity microemulsions rather than viscous macroemulsions. Second, these light cosolvents greatly improve the phase behavior in a way that can be tailored to a particular oil, temperature, and salinity. This new chemical enhanced-oil-recovery (EOR) technology uses polymer for mobility control and has been termed alkali/cosolvent/polymer (ACP) flooding. ACP corefloods perform as well as alkaline/surfactant/polymer (ASP) corefloods while being simpler and more robust. We report 12 successful ACP corefloods using four different crude oils ranging from 12 to 24°API. The ACP process shows special promise for heavy oils, which tend to have large fractions of soap-forming acidic components, but is applicable across a wide range of oil gravity.

scholarly journals Modern assessment of bakery properties of Russian wheat

2021 ◽  
Vol 83 (1) ◽  
pp. 155-162
Author(s):  
E. P. Meleshkina ◽  
S. N. Kolomiets ◽  
N. S. Zhiltsova ◽  
O. I. Bundina
Keyword(s):  
Rheological Properties ◽  
High Water ◽  
Climatic Conditions ◽  
Falling Number ◽  
Low Viscosity ◽  
High Water Absorption ◽  
Wide Range ◽  
The Russian Federation ◽  
Starch Retrogradation

The paper presents an analysis of the quality of soft wheat grown in different soil and climatic conditions of the Russian Federation and having a wide range of quality indicators (the amount of gluten - from 15.3 to 29.4%, the quality of gluten - from 29 to 84 units. IIR, falling number - from 134 to 475 sec). Revealed significant differences in the quality of modern Russian wheat from the wheat of the late XX century. The interrelationships of indicators of quality of grain, flour obtained from it, rheological properties of dough with indicators of quality of bread on a modern instrument base using an alveograph, valorigraph and mixolab have been established. The study of the rheological properties of the dough on the mixolab was carried out in the classical "Chopin Wheat +" mode. According to the profiler parameters (radial diagram), it was found that the analyze grain was characterized by increased rates of starch retrogradation, which characterizes the carbohydrate-amylase complex of flour, a high water absorption index, and increased amylolytic activity; low viscosity and gluten +. To differentiate the strength of wheat, a test laboratory baking of bread was carried out using two methods - the remix method and the reduced-remix method, which showed that the most stable relationships were revealed when baking bread with the remix method. When baking with the abbreviated method, higher indicators of bread quality were obtained, but there are fewer stable relationships, moreover, both for wheat containing less than 25% gluten and more than 25%.

scholarly journals The Role of Nanodispersed Catalysts in Microwave Application during the Development of Unconventional Hydrocarbon Reserves: A Review of Potential Applications

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 420
Author(s):  
Alexey V. Vakhin ◽  
Mohammed Amine Khelkhal ◽  
Arash Tajik ◽  
Marat R. Gafurov ◽  
Oleg G. Morozov ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Transition Metal Catalysts ◽  
Microwave Exposure ◽  
Well Production ◽  
Combined Application ◽  
Dispersed Catalysts ◽  
Potential Applications ◽  
Water Cut ◽  
Molecular Components ◽  
Physical And Chemical

Electromagnetic impact on oil reservoir manifests itself in various physical and chemical phenomena and attracts a significant scientific and technological interest. Microwave (MW) radiation heating can be more efficient for the oil recovery than heat transfer by convection or by thermal conduction. MW influence can also lead to significant changes in the physicochemical and rheological properties of oil caused by chemical processes of transformation of the oil high-molecular components such as resins and asphaltenes. The efficiency of transition-metal catalysts applied for the in-situ conversion of hydrocarbons directly in the reservoir might be significantly increased by exposing the oil formation to MW radiation. Actually, transition metals nanoparticles and their oxides are considered as active absorbers of MW radiation and; therefore, they can be used to intensify MW impact on the reservoir. Catalyst particles dispersed in the formation provide enhanced MW sweep. Taken together, the functioning of the catalysts and the effect of microwave radiation provide deep conversion of resins and asphaltenes, a decrease in the viscosity of the produced oil and an increase in oil recovery factor, along with a decrease in water cut of the well production. The present review analyzes the latest works on the combined application of microwave exposure and dispersed catalysts. In addition, this review discusses the prospects and perspectives of practical application of electromagnetic heating to enhance heavy oil recovery in the presence of nanoparticles.

IMPROVING THE EFFICIENCY OF OPERATING AN OIL WELL WITH BOTTOM WATER

2021 ◽  
Author(s):  
Ильяс Азаматович Ишбулатов
Keyword(s):  
Oil Recovery ◽  
Bottom Water ◽  
Recovery Factor ◽  
Oil Well ◽  
Well Production ◽  
Oil Water ◽  
Water Cut

При разработке водонефтяных зон наблюдается образование конусов подошвенной воды, что ведет к увеличению обводненности скважинной продукции и снижению коэффициента извлечения нефти (КИН). В качестве одного из методов борьбы с данным явлением возможно применение технологии, описанной в патенте RU 2 730 163 C1. В данной статье представлены результаты моделирования данной технологии в гидроди-намическом симуляторе. During the development of oil-water zones, the formation of bottom water cones is observed, which leads to an increase in the water cut of the well production and a decrease in the oil recovery factor. As one of the methods to combat this phenomenon, it is possible to use the technology described in patent RU 2 730 163 C1. This article presents the results of modeling this technology in a hydrodynamic simulator.

scholarly journals Experimental study of rheological properties of liquids for hydrofracturing

2020 ◽  
pp. 69-77
Author(s):  
D. V. Efremov ◽  
◽  
I. A. Bannikova ◽  
Y. V. Bayandin ◽  
E. V. Krutikhin ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Oil Recovery ◽  
Dynamic Viscosity ◽  
Viscoelastic Properties ◽  
Oil And Gas ◽  
Measuring System ◽  
Shear Rates ◽  
Coaxial Cylinders ◽  
Wide Range ◽  
Viscoelastic Surfactant

The work is devoted to the study of the rheological behavior of proppant carrier fluids used for hydraulic fracturing (HF) technology in order to increase oil recovery, including from hard-torecover oil and gas reserves, in a wide range of deformation rates using viscometers of various designs. Rheological properties were studied for proppant carrier fluids based on guar and Surfogel grade D, (type 70–100, produced by JSC “Polyex”) with comparable shear rate 128 s–1. Quasistatic experiments to determine the values of the dynamic viscosity of the liquids under study were carried out using a falling ball viscometer (according to the Stokes method). Using an original viscometer, consisting of two coaxial cylinders (rotary rheometer), the dynamic viscosity of surfogel was investigated in a wide range of shear rates. The viscoelastic properties of surfactants were studied using a Physica MCR501 rheometer, which has a plane-to-plane measuring system and allows rheological studies in rotational and oscillatory modes. A comparison of the rheological properties of fluids based on the guar and the viscoelastic surfactant is carried out and it is established that a fluid based on the viscoelastic surfactant has a higher dynamic viscosity and does not lose its elastic properties, which is an certain advantage over a fluid based on the guar.

Ultra-Low Interfacial Tension of a Surfactant under a Wide Range of Temperature and Salinity Conditions for Chemical Enhanced Oil Recovery

2018 ◽  
Vol 55 (3) ◽  
pp. 252-257 ◽  
Author(s):  
Derong Xu ◽  
Wanli Kang ◽  
Liming Zhang ◽  
Jiatong Jiang ◽  
Zhe Li ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Wide Range ◽  
Low Interfacial Tension
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