Optimization of Orientation of Horizontal Wells and Direction of Fractures at Multistage Hydraulic Fracturing for Low-Permeability Reservoir: Tradeoff Between Initial Oil Production and Oil Recovery

The efficiency of gas injection for developing terrigenous deposits within a multilayer producing object is investigated in this article. According to the results of measurements of the 3D hydrodynamic compositional model, an assessment of the oil recovery factor was made. In the studied conditions, re-injection of the associated gas was found to be the most technologically efficient working agent. The factors contributing to the inefficacy of traditional methods of stimulating oil production such as multistage hydraulic fracturing when used to develop low-permeability reservoirs have been analyzed. The factors contributing to the inefficiency of traditional oil-production stimulation methods, such as multistage hydraulic fracturing, have been analysed when they are applied to low-permeability reservoirs. The use of a gas of various compositions is found to be more effective as a working agent for reservoirs with permeability less than 0.005 µm2. Ultimately, the selection of an agent for injection into the reservoir should be driven by the criteria that allow assessing the applicability of the method under specific geological and physical conditions. In multilayer production objects, gas injection efficiency is influenced by a number of factors, in addition to displacement, including the ratio of gas volumes, the degree to which pressure is maintained in each reservoir, as well as how the well is operated. With the increase in production rate from 60 to 90 m3 / day during the re-injection of produced hydrocarbon gas, this study found that the oil recovery factor increased from 0.190 to 0.229. The further increase in flow rate to 150 m3 / day, however, led to a faster gas breakthrough, a decrease in the amount of oil produced, and a decrease in the oil recovery factor to 0.19 Based on the results of the research, methods for stimulating the formation of low-permeability reservoirs were ranked based on their efficacy.

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The efficiency of gas injection into low-permeability multilayer hydrocarbon reservoirs

10.31224/osf.io/vc92s ◽

2021 ◽

Author(s):

Sudad H Al-Obaidi ◽

Hofmann M ◽

Khalaf FH ◽

Hiba H Alwan

Keyword(s):

Hydraulic Fracturing ◽

Oil Recovery ◽

Gas Injection ◽

Oil Production ◽

Recovery Factor ◽

Low Permeability ◽

Compositional Model ◽

Multistage Hydraulic Fracturing ◽

Low Permeability Reservoirs ◽

Working Agent

The efficiency of gas injection for developing terrigenous deposits within a multilayer producing object is investigated in this article. According to the results of measurements of the 3D hydrodynamic compositional model, an assessment of the oil recovery factor was made. In the studied conditions, re-injection of the associated gas was found to be the most technologically efficient working agent. The factors contributing to the inefficacy of traditional methods of stimulating oil production such as multistage hydraulic fracturing when used to develop low-permeability reservoirs have been analysed. The factors contributing to the inefficiency of traditional oil-production stimulation methods, such as multistage hydraulic fracturing, have been analysed when they are applied to low-permeability reservoirs. The use of a gas of various compositions is found to be more effective as a working agent for reservoirs with permeability less than 0.005 μm2. Ultimately, the selection of an agent for injection into the reservoir should be driven by the criteria that allow assessing the applicability of the method under specific geological and physical conditions. In multilayer production objects, gas injection efficiency is influenced by a number of factors, in addition to displacement, including the ratio of gas volumes, the degree to which pressure is maintained in each reservoir, as well as how the well is operated. With the increase in production rate from 60 to 90 m3 / day during the re-injection of produced hydrocarbon gas, this study found that the oil recovery factor increased from 0.190 to 0.229. The further increase in flow rate to 150 m3 / day, however, led to a faster gas breakthrough, a decrease in the amount of oil produced, and a decrease in the oil recovery factor to 0.19. Based on the results of the research, methods for stimulating the formation of low-permeability reservoirs were ranked based on their efficacy.

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Increasing the Productivity of Horizontal Wells Through Multistage Hydraulic Fracturing Using a Working Fluid Based on a New Biopolymer System

10.2118/206655-ms ◽

2021 ◽

Author(s):

Nikolay Mikhaylovich Migunov ◽

Aleksey Dmitrievich Alekseev ◽

Dinar Farvarovich Bukharov ◽

Vadim Alexeevich Kuznetsov ◽

Aleksandr Yuryevich Milkov ◽

...

Keyword(s):

Hydraulic Fracturing ◽

Russian Federation ◽

Oil Production ◽

Horizontal Wells ◽

Working Fluid ◽

High Tech ◽

Executive Order ◽

Bazhenov Formation ◽

Multistage Hydraulic Fracturing ◽

The Russian Federation

Abstract According to the US Energy Agency (EIA), Russia is the world leader in terms of the volume of technically recoverable "tight oil" resources (U.S. Department of Energy, 2013). To convert them into commercial production, it is necessary to create cost-effective development technologies. For this purpose, a strategy has been adopted, which is implemented at the state level and one of the key elements of which is the development of the high-tech service market. In 2017, the Minister of Energy of the Russian Federation, in accordance with a government executive order (Government Executive Order of the Russian Federation, 2014), awarded the Gazprom Neft project on the creation of a complex of domestic technologies and high-tech equipment for developing the Bazhenov formation with the national status. It is implemented in several directions and covers a wide range of technologies required for the horizontal wells drilling and stimulating flows from them using multi-stage hydraulic fracturing (MS HF) methods. Within the framework of the technological experiment implemented at the Palyanovskaya area at the Krasnoleninskoye field by the Industrial Integration Center "Gazpromneft - Technological Partnerships" (a subsidiary of Gazprom Neft), from 2015 to 2020, 29 high-tech wells with different lengths of horizontal wellbore were constructed, and multistage hydraulic fracturing operations were performed with various designs. Upon results of 2020, it became possible to increase annual oil production from the Bazhenov formation by 78 % in comparison with up to 100,000 tons in 2019. The advancing of development technologies allowed the enterprise to decrease for more than twice the cost of the Bazhenov oil production from 30 thousand rubles per ton (69$/bbl) at the start of the project in 2015 to 13 thousand rubles (24$/bbl) in 2020. A significant contribution to the increase in production in 2020 was made by horizontal wells, where MS HF operations were carried out using an experimental process fluid, which is based on the modified Si Bioxan biopolymer. This article is devoted to the background of this experiment and the analysis of its results.

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Individual Fracture Efficiency Monitoring in Horizontal Wells by Using a New 3d Fine-Grid Temperature Modelling

10.2118/207237-ms ◽

2021 ◽

Author(s):

Vitaly Virt ◽

Vladimir Kosolapov ◽

Vener Nagimov ◽

Andrey Salamatin ◽

Yulia Fesina ◽

...

Keyword(s):

Hydraulic Fracturing ◽

Oil Recovery ◽

Transient Analysis ◽

Horizontal Wells ◽

Sweep Efficiency ◽

Fine Grid ◽

Hydrodynamic Parameters ◽

Multistage Hydraulic Fracturing ◽

Multi Stage ◽

Differential Efficiency

Abstract Profitable development of hard-to-recover reserves often involves drilling of horizontal wells with multistage hydraulic fracturing to increase the oil recovery factor. Usually to monitor the fracture sweep efficiency, pressure transient analysis is used. However, in case of several fractures this method delivers only average hydrodynamic parameters of the well-fracture system. This paper illustrates the value of temperature logging data and demonstrates possibilities of the 3-D thermo-mechanical modelling in evaluating the differential efficiency of multi-stage hydraulic fracturing.

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The Development Method of Low-Permeability and Ultra-Low-Permeability Reservoirs by Waterflooding

10.2118/206416-ms ◽

2021 ◽

Author(s):

Azat Albertovich Gimazov ◽

Ildar Shamilevich Bazyrov

Keyword(s):

Hydraulic Fracturing ◽

Oil Recovery ◽

Horizontal Wells ◽

Hydrodynamic Modeling ◽

Low Permeability ◽

Production Well ◽

Development Method ◽

Multi Stage ◽

Horizontal Part ◽

Low Permeability Reservoirs

Abstract The article describes a method for developing low-permeability reservoirs using horizontal wells with multi-stage hydraulic fracturing. The effectiveness of the new method lies in protecting the horizontal part of the production well by drilling it through a non-reservoir plastic reservoir adjacent directly to the target reservoir. The paper considers various implementations of the technology and estimates the increase in oil recovery factor for each of them based on the results of hydrodynamic modeling. The risks associated with the implementation of the technology are considered. Methods for their reduction are proposed.

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Efficiency Analysis of the Geological-Technical Activities in Severo-Ostrovnoe Field

Journal of Computational and Theoretical Nanoscience ◽

10.1166/jctn.2019.8359 ◽

2019 ◽

Vol 16 (11) ◽

pp. 4584-4588

Author(s):

I. A. Pogrebnaya ◽

S. V. Mikhailova

Keyword(s):

Hydraulic Fracturing ◽

Production Rate ◽

Oil Recovery ◽

Oil Production ◽

Horizontal Wells ◽

Oil Field ◽

Field Development ◽

Multi Stage ◽

Field Works ◽

Technical Measures

The work is devoted to identifying the most relevant geological and technical measures carried out in Severo-Ostrovnoe field from the period of its development to the present. Every year dozens of geotechnical jobs (GJ) are carried out at each oil field-works carried out at wells to regulate the development of fields and maintain target levels of oil production. Today, there are two production facilities in the development of the Severo-Ostrovnoe field: UV1a1 and BV5. With the help of geotechnical jobs, oil-producing enterprises ensure the fulfillment of project indicators of field development (Mikhailov, N.N., 1992. Residual Oil Saturation of Reservoirs Under Development. Moscow, Nedra. p.270; Good, N.S., 1970. Study of the Physical Properties of Porous Media. Moscow, Nedra. p.208). In total, during the development of the Severo-Ostrovnoe field, 76 measures were taken to intensify oil production and enhance oil recovery. 12 horizontal wells were drilled (HW with multistage fracking (MSF)), 46 hydraulic fracturing operations were performed, 12 hydraulic fracturing operations were performed at the time of withdrawal from drilling (HW with MSF), five sidetracks were cut; eight physic-chemical BHT at production wells; five optimization of well operation modes. The paper analyzes the performed geological and technical measures at the facilities: UV1a1∦BV5 of the Severo-Ostrovnoe field. Four types of geological and technical measures were investigated: hydraulic fracturing, drilling of sidetracks with hydraulic fracturing, drilling of horizontal wells with multi-stage hydraulic fracturing, and physic-chemical optimization of the bottom-hole formation zone. It was revealed that two geotechnical jobs, namely, formation hydraulic fracturing (FHF) and drilling of lateral shafts in the Severo-Ostrovnoe field are the most highly effective methods for intensifying reservoir development and increasing oil recovery. SXL was conducted at 5 wells. The average oil production rate is 26.6 tons per day, which is the best indicator. Before this event, the production rate of the well was 2.1 tons per day. Currently, the effect of ongoing activities continues.

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Improving The Development Efficiency of Low-Permeability Reservoirs and Hard-To-Recover Reserves with The Introduction of Recoverable Liners Technology in Horizontal Wells with Multi-Stage Hydraulic Fracturing

10.3997/2214-4609.202154063 ◽

2021 ◽

Author(s):

A.M. Ishkinov ◽

I.N. Esipenok ◽

A.F. Mingazov

Keyword(s):

Hydraulic Fracturing ◽

Horizontal Wells ◽

Low Permeability ◽

Multi Stage ◽

Low Permeability Reservoirs

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Improvement of oil production in low permeability deposits with a system of horizontal wells

Revista de la Universidad del Zulia ◽

10.46925//rdluz.29.13 ◽

2020 ◽

Vol 11 (29) ◽

pp. 205-216 ◽

Cited By ~ 1

Author(s):

N.R. Krivova

Keyword(s):

Oil Production ◽

Horizontal Wells ◽

Low Permeability ◽

Pilot Tests

The article describes an approach to the production of difficult to extract oil, confined to deposits with low poroperm properties, using a system of horizontal wells and hydraulic multistage fracturing. The main problems that arise during the development of the well are analyzed. A conclusion is reached on the possibility of continuing to apply the method based on the analysis of pilot tests.

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