Efficiency of Application of the Horizontal Wells’ System for Extraction of High-Viscosity Oil Reserves

The estimation of the share of hard-to-extract oil reserves in the deposits of Russia varies by different sources, in a fairly wide range (from 30 to 70 %). Due to the absence of a common approach to their definition, the variety of parameters used to estimate this share and fundamentally different conditions for the development of the groups of reserves classified as hard-to-extract become challanging. A significant share of the proven oil reserves of Russian oil fields - about 34 % (6.3 million tons) - belongs to heavy (oil density more than 0.871 g/cm3) and super-heavy (oil density more than 0.895 g/cm3). In general, the share of high-viscosity and super-highviscosity oils is about 13% (2.4 million tons). The largest share refers to the deposits of three districts. In lowpermeable collectors (permeability less than 0.05 μm2), huge reserves are concentrated – 8.2 million tons or 44.6 % of all oil. Comparison of oil extraction and reserves structure indicates a good correlation for oil extraction from low-permeable collectors in 41.8 % with reserves percentage in 44.6 % as well as a relatively good correlation in super-heavy oil in 13.4% with reserves percentage in 18 % and low rates for super-high-viscosity oil in 1.7% with reserves perecentage in 6 %. Significant proven reserves of high-viscosity oil in Russia indicate the possibility of increasing production with the introduction of modern, existing and proven, technologies under appropriate economic conditions. Full-scale involvement in the development of only the largest deposits of high-viscosity oil would allow the Russian Federation to produce at least 25-30 million tons in the medium term.

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Efficiency of horizontal wells in fields with highly viscous oil on the example of Tengri field

Kazakhstan journal for oil & gas industry ◽

10.54859/kjogi89574 ◽

2021 ◽

Vol 3 (2) ◽

pp. 111-123

Author(s):

A. S. Mardanov ◽

R. A. Yussubaliev ◽

A. A. Yergaliyev ◽

A. M. Rakhmetullin

Keyword(s):

Oil Recovery ◽

High Efficiency ◽

Complex Structure ◽

Horizontal Wells ◽

High Viscosity ◽

Vertical Wells ◽

Viscous Oil ◽

Effective Development ◽

High Viscosity Oil ◽

Highly Viscous Oil

Due to the growing share of high-viscosity oils in Kazakhstan, task of their effective development is becoming more complicated. Development of terrigenous reservoirs that have a complex structure and contain high-viscosity oil lead to low rates of sampling and low values of oil recovery factor. Currently, technologies that ensure high efficiency in development of such deposits are very expensive. The paper considers a pilot section of the development horizon of cretaceous system of the Tengri field, drilled with vertical wells in accordance with current project document. Further the average characteristics of the parameters of horizontal wells are compared and measures are proposed to improve the efficiency of further operation of these wells.

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Investigation of the two-dimensional problem of filtration of high-viscosity oil in a formation under thermal action

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2017.2.035 ◽

2017 ◽

Vol 12 (2) ◽

pp. 232-237

Author(s):

A.A. Gizzatullina

Keyword(s):

Numerical Solutions ◽

Numerical Study ◽

Thermal Action ◽

Horizontal Wells ◽

High Viscosity ◽

Oil Reservoir ◽

Two Dimensional ◽

Adopted Model ◽

High Viscosity Oil ◽

Oil Filtration

A theoretical and numerical study of developing a reservoir with high-viscosity oil using the technology of pair horizontal wells is presented. In a two-dimensional formulation, numerical solutions to the problem of the possibility of extracting high-viscosity oil from a formation with the use of thermal action were obtained. The proposed method is aimed at increasing the efficiency of developing an oil reservoir with high viscosity oil by ensuring a uniform warming up of the developing zone of the field. The adopted model allows to trace a detailed two-dimensional picture of oil filtration in the reservoir and to investigate the main regularities of this process.

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Designing the Thermal Enhanced Oil Recovery as a Key Technology of High Viscosity Oil Production

10.2118/207059-ms ◽

2021 ◽

Author(s):

Mukhtar Shakenuly Shaken ◽

Baurzhan Yerikovich Zhiyengaliyev ◽

Altynbek Suleymenuly Mardanov ◽

Adil Sultangaliyevich Dauletov

Keyword(s):

Oil Recovery ◽

Hydrodynamic Model ◽

Oil Production ◽

Horizontal Wells ◽

High Viscosity ◽

Oil Reservoirs ◽

Production Rates ◽

Cyclic Steam Stimulation ◽

High Viscosity Oil ◽

Steam Stimulation

Abstract Due to the decrease in "easy" oil reserves, oil companies are focusing on "hard-to-recover" reserves, in particular, high-viscosity oil reservoirs. Shallow oil reservoirs are mainly concentrated in the Cretaceous horizons, in the western region of the country, along the Caspian coast. One of them is a high-viscosity oil reservoir, consisting of three Cretaceous horizons. The average viscosity of oil in reservoir conditions is around 746.7 cP. The current achieved oil production is only 5% of the initial recoverable reserves, and designed oil recovery factor is 38% and implies the full-scale application of thermal methods of EOR. The objective of this work was to choose the most suitable thermal method of EOR and to assess the prospects of applicability with the calculation of economic feasibility. Considering the geological features of the reservoir, the cyclic steam stimulation was chosen as the optimal method to increase oil recovery. In order to assess the expediency of this technology, was initiated project on thermal modeling the technology based on the current geological and hydrodynamic model of the field, using the results of laboratory studies, calculations were performed on imagined horizontal wells, and carried out the analysis of technical and economic efficiency. According to the results of calculations on the hydrodynamic model, the production rates using the technology of cyclic steam stimulation in horizontal wells are 30% higher than the production rates of "cold production", and the difference in accumulated oil production over 5 years will be 20–30%.

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Application of thermal methods in the Republic of Kazakhstan. Current projects and prospects

Proceedings of OilGasScientificResearchProjects Institute SOCAR ◽

10.5510/ogp20210100488 ◽

2021 ◽

pp. 114-123

Author(s):

B.M. Mukhtanov ◽

Keyword(s):

High Viscosity ◽

Thermal Methods ◽

Technology Application ◽

Oil Reserves ◽

Development Technology ◽

The Republic ◽

High Viscosity Oil

This article presents the results of assessment and prospectivity of high-viscosity oil reserves difficult to recover development technology application by means of thermal formation treatment based on analysis of Kenkiyak, Kumsai and Mortuk fields development.

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Physical and Mathematical Model and Method for Computing Heat and Mass Transfer Processes in the System of a Stratum Featuring Horizontal Well

Herald of the Bauman Moscow State Technical University Series Natural Sciences ◽

10.18698/1812-3368-2021-3-133-149 ◽

2021 ◽

pp. 133-149

Author(s):

I.N. Zhizhimontov ◽

A.B. Shabarov

Keyword(s):

Mathematical Model ◽

Mass Transfer ◽

Heat And Mass Transfer ◽

Numerical Study ◽

Horizontal Wells ◽

High Viscosity ◽

Transfer Processes ◽

Mass Transfer Processes ◽

Thermophysical Model ◽

High Viscosity Oil

In order to solve scientific and engineering problems arising during analysis and development of hard-to-recover hydrocarbon reserves in high-viscosity oil deposits, we performed a numerical study of heat and mass transfer processes in a mixture of water and oil. We achieved these goals by developing a hydrodynamic and thermophysical model of non-steady-state quasi-three-dimensional heat and mass transfer in a stratum featuring a system of horizontal wells. We propose an analytical approach to plotting a dynamic computational grid in a natural semi-fixed coordinate system. We compute streamlines and equipotential lines using the analytical solution proposed, which is based on complex analysis. The object of our investigation is natural strata saturatedby a multiphase fluid. We used the physical and mathematical model and the calculation method proposed to develop a software package and conduct a series of numerical and parametric studies concerning the effects caused by thermophysical properties of rocks and fluids combined with various operation modes in a system of horizontal wells. The paper describes how these parameters affect the rate of oil production in a real high-viscosity oil deposit. We verified the results obtained against actual core sample investigation data and technological parameters of oil deposit development, and further compared them to known analytical solutions and commercial hydrodynamic simulators

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Formation of the Organizational Structure of Managing a Large Project of Oil Field Development

TEM Journal ◽

10.18421/tem103-16 ◽

2021 ◽

pp. 1122-1129

Author(s):

Chulpan Zakirova ◽

Regina Sadykova ◽

Gennady Stroykov ◽

Zinnur Zakirov

Keyword(s):

Organizational Structure ◽

Economic Effect ◽

High Viscosity ◽

Development Project ◽

Oil Field ◽

Successful Implementation ◽

Field Development ◽

Oil Reserves ◽

Modern Business ◽

High Viscosity Oil

The article analyzes the organizational structure of the project management development with regard to the field of traditional oil reserves, functional responsibilities and areas of responsibility of its participants, as well as the mechanisms of their interaction during the implementation of work to form the organizational structure of managing a large and unique project – the development of high-viscosity oil deposits. It has been revealed that in modern business conditions the implementation of projects for the development and recovery of high-viscosity oil fields based on the traditional organizational structure of management is not effective enough. The main reasons that impede the successful implementation of projects for the development of new deposits based on the traditional organizational structure of management are identified. A new organizational structure for managing a field development project is proposed, which includes a single center of responsibility for the field development project. By the example of the Ashalchinskoye field, the economic effect of using the formed organizational structure for managing the project for developing the field in the form of a possible additional annual oil production was calculated.

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