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Kaluder, Zdenko (TNK-BP) | Nikolaev, Maxim (TNK-BP) | Davidenko, Igor (TNK-BP) | Leskin, Fedor (TNK-BP Management) | Martynov, Mikhail (TNK-BP) | Shishmanidi, Irina (TNK-BP) | Platunov, Andrey (TNK-BP) | Chong, KK (Halliburton Energy Services Grp) | Astafyev, Vladimir (Halliburton) | Shnitiko, Andrey (Halliburton) | Fedorenko, Evgeny (Halliburton)
Application of horizontal multiple stage fracturing is becoming the standard completion technique for oil and gas developments both in Shale and Tight Sand. This technology has proven to be a game-changer for the United States oil and gas industry to the point of creating an oversupply of gas in United States. Predictions indicate that the supply of oil related to this technology could allow the United States to become self-sufficient within this decade. Globally, shale and tight sand exploration activities are also increasing. This concept was successfully suited to one of the Russian Tight Oil plays within the Em-Yoga license area in Western Siberia. This paper provides the case history of how horizontal multiple fracturing completion methodology helped to unlock the potential Western Siberian Em-Yoga Tight Oilfield. This very heterogeneous and lenticular sand oil play was known for years for its complexity and arduous nature to extract oil from. The completion technique employed the proven North America multiple stage fracturing using a combination of swell-able packers and sliding sleeve frac ports. The fracturing design for the Em-Yoga field will be discussed in this paper. This design is an adaptation of an alternating hybrid fluid system composed of proppant slugs during the pad stage and a high concentration proppant ramp in the main frac stage. The well is currently flowing at commercial rates synonymous with early production time in a typical North American oil shale well. In this paper, the authors describe the various monitoring techniques of how fracturing efficiency was measured. Earlier production allowed providing of fit curve production analysis to evaluate how the project is being commercially realized.
Kaluder, Zdenko (OJSC Rosneft Oil Company, Andrey Platunov (Ex-TNK-BP)) | Nikolaev, Maxim (OJSC Rosneft Oil Company, Andrey Platunov (Ex-TNK-BP)) | Davidenko, Igor (OJSC Rosneft Oil Company, Andrey Platunov (Ex-TNK-BP)) | Leskin, Fedor (OJSC Rosneft Oil Company, Andrey Platunov (Ex-TNK-BP)) | Martynov, Mikhail (OJSC Rosneft Oil Company, Andrey Platunov (Ex-TNK-BP)) | Chong, K. K. (Halliburton) | Prokhorov, Alexey (Halliburton) | Shnitko, Andrey (Halliburton) | Fedorenko, Evgeny (Halliburton)
Abstract Application of horizontal multiple-stage fracturing is becoming the standard completion technique for oil and gas developments both in shale and tight sands. This technology has proven to be a game-changer within the US oil and gas industry to the point of creating an oversupply of gas in the US. Predictions indicate that the supply of oil related to this technology could allow the US to become self-sufficient within the decade. Globally, shale and tight-sand exploration activities are also increasing. This concept was successfully suited for and applied within a Russian tight-oil play in the Em-Egovskoe license area in western Siberia. This paper provides the case history of how a horizontal multiple-fracturing completion methodology helped unlock the potential reserves in the western Siberian Em-Egovskoe tight oil field. This very heterogeneous and lenticular sand oil play was known for years for its complexity and arduous nature. The completion technique employed a proven North America multiple-stage fracturing technique using a combination of swellable packers and sliding-sleeve frac ports. The fracturing design for the Em-Egovskoe field is discussed. This design is an adaptation of an alternating hybrid fluid system composed of proppant slugs during the pad stage and a high-concentration proppant ramp in the main frac stage. The well is currently flowing at commercial rates synonymous with early production in a typical North American oil shale well. The various monitoring techniques for measuring fracturing efficiency are also discussed. A production curve fit analysis using early production data allowed the operator to evaluate how the project was being commercially realized. Results and recommendations are presented.
Platunov, A. (OJSC Rosneft Oil Company) | Martynov, M. (OJSC Rosneft Oil Company) | Nikolaev, M. (OJSC Rosneft Oil Company) | Leskin, F. (OJSC Rosneft Oil Company) | Davidenko, I. (OJSC Rosneft Oil Company)
The pdf file of this paper is in Russian. To purchase the paper in English, order SPE-166914-MS.
This paper is based on study of formations in Bazhenov and Tyumenskoe horizons of Em-Yoga field Krasnoleninsky arch West Siberia with the aim of defining the geomechanical concepts of studied area. Hydrocarbon production from Bazhenov and Tyumenskoe formations in West Siberia is actually established through number of pilot wells with production testing. Economic profitability of producing wells depends on the efficiency of hydraulic fracturing in cases where the technology is predefined by reservoir development project. This article describes the principles and prerequisites of hydraulic fracturing mechanics under geomechanical conditions of the studied rocks.
Tyumenskoe and Bazhenov formations are dated to Upper and Middle Jurassic geological time. Geological depositional environment and posterior transformations in time have created specific conditions for rock geomechanics. Rock mechanics in studied formations practically predetermines the concept of how rock is fractured. This work presumes basis for typification and description of fractures occurred naturally and created as a result of hydraulic fracturing and how those interfere with each other.
This work is stand on the accumulated results of the ongoing study and actual data from producing wells in Em-Yoga field Krasnoleninsky arch West Siberia. The Jurassic rocks studied in this article are stratigraphically divided into formations of Tyumenskoe, Abalak and Bazhenov horizons. Enacted stratigraphic cross-sectional classification describes the formations of Tyumenskoe horizon as porous rock, Abalak horizon as cavernous-porous naturally fractured and Bazhenov as naturally fractured and micro-porous types of rock.
The nature of fractures
The technogenic fractures, as a rule of thumb, induced during the drilling at applied pressure exceeding fracture breakdown pressure or during the hydraulic fracturing and are created in direction of North-West and South-East in the range of 140 - 180 degrees along the entire interval of Jurassic formations (Fig. 1, 7). Natural fractures formed during geological transformations have no strict consistency in azimuthal direction within the studied area of Em-Yoga field (Fig. 1).
Ipatov, Andrey Ivanovich (Scientific and Technical Center of Gazprom Neft) | Zhukovskaia, Elena Anatolievna (Scientific and Technical Center of Gazprom Neft) | Lazutkin, Dmitriy Mikhailovich (Bazhen Technical Center)
Abstract Modern technology of drilling and construction of horizontal wells allows for effective development of complex oil fields hard-to-recover oil reserves includes off low-permeability (less than 1-2 mD) and hyper-low-permeable (0.01-0.0001mD) fields. The latter in Russia include Bazhen, Domanic and Achimov fields. Their development provides for the mandatory completion of HW with Multiple-Fractured Horizontal Wells (MFHW). Experience in the development of layers of the specified type for Gazpromneft PJSC shows that the highest oil production rate is achieved if the MFHW system reveals not only the low-permeability rock matrix, but also captures the highly conductive (typically fractured) streaks — "strata-conveyors" (the latter may also be located in neighboring geological and stratigraphic differences). The difference in the permeability of such highly conductive layers and the hyper-low-permeable matrix of the host rocks can be very significant (up to 10!). In addition to the positive aspects of the presence of highly conductive layers in the section associated with the achievement of high initial oil flow rates in new wells, in the process of further development, negative consequences may arise as a result of premature (even unpredictable) gas and water breakthroughs through narrow fractured layers. Is it possible to take into account the risks of loss of well productivity as a consequence of the pronounced geological heterogeneity of these fields, even if the scale of the impact of this heterogeneity is still difficult to assess by modern research methods? In this paper analyzes some of the results of core, logging, well testing and indicator studies with the allocation of characteristic features indicating the presence of local highly conductive fractured layers in the section of the oil the Bazhen-Abalak complex (BAC).
Abstract An approach in Bazhenov formation exploration applied by Gazprom Neft is presented. Projects implemented in the company are pointed on making of a complex system that includes regional studies, geological exploration and pilot operations, learning and adaptation of the best world practices and creating own tools and techniques for research and development of Bazhenov formation. Major mining and service companies, science-research institutes are participating in these projects. By this time multifunctional group of specialists deduced criterions of oil and gas extraction availability, and the most attractive zones ("sweet spots") of Bazhenov formation spreading were selected. On the base of deduced criterions presumptions of Bazhenov formation productivity were gathered. Examining of these presumptions and more detailed exploration of the researched object and approbation of techniques and technologies of oil extraction are being made by geological exploratory and pilot projects in the current licensed spots of the company. The first results of these works showed availability of development of Bazhenov formation in Western Siberia.