scholarly journals Modeling of Heavy-Oil Flow with Regard to Their Rheological Properties

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 359
Author(s):  
Ilia Beloglazov ◽  
Valentin Morenov ◽  
Ekaterina Leusheva ◽  
Ove T. Gudmestad
Keyword(s):  
Rheological Properties ◽  
Heavy Oil ◽  
Computational Models ◽  
Oil Field ◽  
Pipeline System ◽  
Natural Bitumen ◽  
Treatment Techniques ◽  
Oil Flow ◽  
Light Oil ◽  
Pumping Mode

With the depletion of traditional energy resources, the share of heavy-oil production has been increasing recently. According to some estimates, their reserves account for 80% of the world’s oil resources. Costs for extraction of heavy oil and natural bitumen are 3–4 times higher than the costs of extracting light oil, which is due not only to higher density and viscosity indicators but also to insufficient development of equipment and technologies for the extraction, transportation, and processing of such oils. Currently, a single pipeline system is used to pump both light and heavy oil. Therefore, it is necessary to take into account the features of the heavy-oil pumping mode. This paper presents mathematical models of heavy-oil flow in oil-field pipelines. The rheological properties of several heavy-oil samples were determined by experiments. The dependencies obtained were used as input data for a simulation model using computational fluid dynamics (CFD) methods. The modeling condition investigates the range of shear rates up to 300 s−1. At the same time, results up to 30 s−1 are considered in the developed computational models. The methodology of the research is, thus, based on a CFD approach with experimental confirmation of the results obtained. The proposed rheological flow model for heavy oil reflects the dynamics of the internal structural transformation during petroleum transportation. The validity of the model is confirmed by a comparison between the theoretical and the obtained experimental results. The results of the conducted research can be considered during the selection of heavy-oil treatment techniques for its efficient transportation.

Challenges, Opportunities and Threats of Deep Bottoms-Up Water Injection in Heavy Oil Reservoir: Lessons Learnt from the G Field, South Oman

2021 ◽  
Author(s):  
Chaitanya Behera ◽  
Sandip Mahajan ◽  
Carlos Annia ◽  
Mahmood Harthi ◽  
Jane-Frances Obilaja ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Heavy Oil ◽  
Water Injection ◽  
Field Performance ◽  
Oil Field ◽  
Oil Fields ◽  
Reservoir Pressure ◽  
Light Oil ◽  
Alternative Water ◽  
Variable Water

Abstract This paper presents the results of a comprehensive study carried out to improve the understanding of deep bottom-up water injection, which enabled optimizing the recovery of a heavy oil field in South Oman. Understanding the variable water injection response and the scale of impact on oil recovery due to reservoir heterogeneity, operating reservoir pressure and liquid offtake management are the main challenges of deep bottoms-up water injection in heavy oil fields. The offtake and throughput management philosophy for heavy oil waterflood is not same as classical light oil. Due to unclear understanding of water injection response, sometimes the operators are tempted to implement alternative water injection trials leading to increase in the risk of losing reserves and unwarranted CAPEX sink. There are several examples of waterflood in heavy oil fields; however, very few examples of deep bottom water injection cases are available globally. The field G is one of the large heavy oil fields in South Oman; the oil viscosity varies between 250cp to 1500cp. The field came on-stream in 1989, but bottoms-up water-injection started in 2015, mainly to supplement the aquifer influx after 40% decline of reservoir pressure. After three years of water injection, the field liquid production was substantially lower than predicted, which implied risk on the incremental reserves. Alternative water injection concepts were tested by implementing multiple water injection trials apprehending the effectiveness of the bottoms-up water injection concept. A comprehensive integrated study including update of geocellular model, full field dynamic simulation, produced water re-injection (PWRI) model and conventional field performance analysis was undertaken for optimizing the field recovery. The Root Cause Analysis (RCA) revealed many reasons for suboptimal field performance including water injection management, productivity impairment due to near wellbore damage, well completion issues, and more importantly the variable water injection response in the field. The dynamic simulation study indicated negligible oil bank development due to frontal displacement and no water cut reversal as initial response to the water injection. Nevertheless, the significance of operating reservoir pressure, liquid offtake and throughput management impact on oil recovery cann't be precluded. The work concludes that the well reservoir management (WRM) strategy for heavy oil field is not same as the classical light oil waterflood. Nevertheless, the reservoir heterogeneity, oil column thickness and saturation history are also important influencing factors for variable water injection response in heavy oil field.

Study on ESP String for Super Heavy Oil Exploitation in Tahe Oil Field

2012 ◽  
Vol 524-527 ◽  
pp. 1577-1580
Author(s):  
Zhi Qiang Huang ◽  
Cheng Song Qiu ◽  
Qin Li ◽  
Ya Chao Ma ◽  
Li Yan Liu
Keyword(s):  
Heavy Oil ◽  
Water Injection ◽  
Sieve Tube ◽  
Oil Field ◽  
Production Costs ◽  
Electrical Cable ◽  
Oil Exploitation ◽  
Light Oil ◽  
New Type ◽  
Tahe Oil Field

During the process of super heavy oil exploitation in Tahe oil field, when mixing light oil, due to heavy oil and light oil entering into pump from separator directly, the existing ESP string leads to poor mixing and heavy oil coming into the pump, as a result, the pump detection period is greatly shorten; when water injection-production, the injected water can contact with electrical cable and motor directly, causing serious damage to the cable and motor, and the pump detection period is also greatly shorten. This paper designs a new type of ESP string, adding a ESP dome, a sieve tube, a mixing device, an intelligent switch and a direct flushing valve, which can improve the mixing effect of heavy oil and light oil, avoid the injected water directly contacting with electrical cable and motor, in order to protect the electrical cable and motor, improve their service life, extend the pump detection period and reduce production costs. Field test showed that the pump detection period has been prolonged after using the new ESP string, it is recommended to promote the use.

Research of rheological properties and displacement of high-paraffin oil

2020 ◽  
Vol 6 (2) ◽  
pp. 81-95
Author(s):  
Lyudmila A. Puldas ◽  
Igor R. Potochnyak ◽  
Olga A. Kuzina ◽  
Denis A. Vazhenin ◽  
Boris V. Grigoriev
Keyword(s):  
Rheological Properties ◽  
Experimental Method ◽  
Heavy Oil ◽  
Heavy Oils ◽  
Laboratory Studies ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Paraffin Oil ◽  
Light Oil ◽  
Model Oil

One of the urgent problems in the extraction of hard-to-recover reserves (TRIZ) of oil is the formation of asphalt-resin-paraffin deposits (AFS) at oil fields, which entails a number of complications when extracting reserves from the subsoil. In solving the problems associated with the study of the mechanism of deposition of asphalt-resin-paraffin complexes on the downhole equipment or inside the reservoir, the leading role is played by laboratory studies with modeling of objects and conditions inherent in a particular field. In particular, it is necessary to prepare model solutions of hydrocarbons simulating downhole oil containing asphalt-resin-paraffin deposits. The purpose of this work was to establish by an experimental method the dependence of the rheological properties of model oil solutions on the amount of asphalt-resin-paraffin deposits dissolved in it, and to study the efficiency of displacing the prepared model oil solution from the bulk model of core with sodium laurine sulfate. The novelty of the work lies in comparing the effect of the mass content of asphalt-resin-paraffin deposits on the viscosity and density for light and heavy oils and in studying the effectiveness of sodium laurine sulfate when displacing paraffin oil. Several oil solutions were prepared with various mass proportions of ARPD in them, after which the temperature dependence of the viscosity and density of each solution was determined. It has been established that the presence of asphalt-resin-paraffin complexes more strongly affects the density when they are dissolved in light oil. As the mass concentration of paraffin deposits increases, their effect on density decreases for both the light oil sample and the heavy oil sample. The viscosity of the presence of paraffin is much more pronounced if they are dissolved in heavy oil than in light oil. There is a phase transformation point for asphalt-resin-paraffin complexes, which will need to be taken into account when setting up laboratory studies to study the mechanism of deposits of asphaltenes, resins, paraffins in the reservoir or downhole equipment. An experimental method was also used to study the displacement ability of sodium laurinsulfate on a bulk core model saturated with prepared model oil solutions, which are paraffinic oil. It was established that this surfactant has a greater oil displacement efficiency compared to water, in addition, based on the result, it follows that the oil displacement coefficient non-linearly depends on temperature. So, when oil is being displaced with paraffin deposits dissolved in it, there is an optimum temperature at which the maximum oil displacement coefficient is ensured.

scholarly journals INVESTIGATION OF RHEOLOGICAL PROPERTIES OF HEAVY OIL DEPOSITS

2020 ◽  
Author(s):  
Sudad H Al-Obaidi ◽  
Smirnov VI ◽  
Kamensky IP
Keyword(s):  
Rheological Properties ◽  
Heavy Oil ◽  
High Viscosity ◽  
Oil Field ◽  
Natural Mode ◽  
Heavy Oils ◽  
Oil Viscosity ◽  
Temperature Range ◽  
Reservoir Conditions ◽  
Oil Deposits

High viscosity of heavy oils at reservoir conditions is one of the main causes of the low production rates of producing wells, and sometimes even their complete absence when trying to develop a field on a natural mode. The rheological properties of heavy oil deposits in a wide temperature range were studied in this work. Special attention was paid to the study of viscous and elastic components of oil viscosity as a function of temperature to justify the optimal conditions for the development of heavy oil fields. Heavy oil samples collected from Pechersky oil field (Russia) were used in this research. Dynamic viscosity tests were carried out on the heavy oil of this field. It was noticed that high values of viscous and elastic components of oil viscosity were observed over the entire temperature range. It has also been remarked that the values of oil viscosity components are inversely proportional to the temperature increase.

scholarly journals Experimental study on percolation mechanism and displacement characteristics of cold recovery in offshore heavy oil field

2021 ◽  
Author(s):  
Ying-xian Liu ◽  
Jie Tan ◽  
Hui Cai ◽  
Gong-chang Wang ◽  
Song-ru Mou
Keyword(s):  
Crude Oil ◽  
Rheological Properties ◽  
Heavy Oil ◽  
Production Capacity ◽  
Oil Field ◽  
Water Flooding ◽  
Oil Reservoir ◽  
Oil Viscosity ◽  
Heavy Oil Reservoir ◽  
Target Block

AbstractThe heavy oil reservoir is a special kind of oil and gas reservoir that differs from the conventional reservoir in many ways. Due to the high viscosity of crude oil, it is not easy to recover. When the viscosity of underground crude oil exceeds 150 cp, the land heavy oil field is generally developed by thermal recovery. S.Z. oilfield is a heavy oil reservoir in the Bohai Sea, with surface crude oil viscosity of 3000–25,000 cp and underground crude oil viscosity of 400–1000 cp. Limited by offshore equipment, the development strategy of land oilfields can't be directly applied. High production capacity is obtained through the cold production development of horizontal branch experimental wells, and the water drive production capacity can reach 40–70 m3/day. At present, there is a lack of research on cold recovery development under the viscosity of crude oil. The existing primary research and common knowledge are challenging to support efficient development technology for effectively producing heavy oil reservoirs. In this paper, through physical simulation experiments, the phase behavior and rheological properties of crude oil in the target block are studied, and the rheological properties of crude oil are clarified. Then, the depletion production and water flooding experiments are carried out, and the displacement characteristics and laws of water flooding cold production are analyzed. Finally, the indoor experiments of water flooding sweep efficiency and oil displacement efficiency in the target block are carried out. Clear its micro and macro spread. It provides technical support for the effective production of offshore heavy oil fields.

Expierence of development of the Liael area of Yaregskoye heavy oil field using different technologies

2019 ◽  
Vol 10 ◽  
pp. 62-67
Author(s):  
S.M. Durkin ◽  
◽  
I.N. Menshikova ◽  
L.M. Rusin ◽  
A.A. Terentiev ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Oil Field

Application of Polymer Flooding in the Revitalization of a Mature Heavy Oil Field

2021 ◽  
pp. 108695
Author(s):  
L.F. Lamas ◽  
V.E. Botechia ◽  
D.J. Schiozer ◽  
M.L. Rocha ◽  
M. Delshad
Keyword(s):  
Heavy Oil ◽  
Polymer Flooding ◽  
Oil Field

Numerical investigation of dynamic and hydrodynamic characteristics of the pad in the fluid pivot journal bearing

2021 ◽  
pp. 135065012110330
Author(s):  
Tuyen Vu Nguyen ◽  
Weiguang Li
Keyword(s):  
Computational Models ◽  
Journal Bearing ◽  
Squeeze Film ◽  
Hydrodynamic Characteristics ◽  
Hydrodynamic Properties ◽  
Squeeze Film Damper ◽  
Lubricant Oil ◽  
Oil Flow ◽  
Flow Through ◽  
Bearing System

The dynamic and hydrodynamic properties of the pad in the fluid pivot journal bearing are investigated in this paper. Preload coefficients, recess area, and size gap, which were selected as input parameters to investigate, are important parameters of fluid pivot journal bearing. The pad’s pendulum angle, lubricant oil flow through the gap, and recess pressure which characterizes the squeeze film damper were investigated with different preload coefficients, recess area, and gap sizes. The computational models were established and numerical methods were used to determine the equilibrium position of the shaft-bearing system. Since then, the pendulum angle of the pad, liquid flow, and recess pressure were determined by different eccentricities.

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