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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)
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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).
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.
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.
Ovcharenko, Y.. (OOO Gazpromneft NTC) | Lukin, S.. (OOO Gazpromneft NTC) | Tatur, O.. (OOO Gazpromneft NTC) | Kalinin, O.. (OOO Gazpromneft NTC) | Kolesnikov, D.. (OOO Gazpromneft NTC) | Esipov, S.. (OOO Gazpromneft NTC) | Zhukov, V.. (OOO Gazpromneft NTC) | Demin, V.. (OOO Gazpromneft-Angara) | Volokitin, Y.. (Salym Petroleum Development N. V.) | Sednev, A.. (Salym Petroleum Development N. V.) | Podberezny, M.. (Salym Petroleum Development N. V.)
Abstract Work is devoted to construction 3D Geomechanics model for Achimov Formation for one of the West Siberia oilfield. The model is performed for monitoring and control field throughout the cycle of its life – start from drilling process (recommendation for optimization well trajectory and well design to exclude drilling risks) and during oilfield development (monitoring the development process to take account of changes in the stress state of the oilfield, its influence on the hydraulic fracture growth and hydrocarbon production processes). Oilfield, which are currently introduced in the development, characterize by increasingly complex geology and, consequently, require more sophisticated technological solutions for both the construction of wells and the development process, which involves the need to build complex 3D geological and geomechanical models. As a result of the work was calculated current stress state on the field, taking into account the effects of faults. Special attention was paid to the process of mapping of faults and low-amplitude tectonic dislocation. For this purpose used inversion stress model, including simulation of deformations and displacements arising under the action of tectonic driver. This model allows to select the tectonic dislocation, the scale of which is significantly smaller than the resolution of seismic. Based on the results of the verification of geomechanical model and sensitivity analysis to the source data, formulated the basic methodological approaches for building and testing models of geomechanical properties was done. During the work was made a forecast borehole stability for horizontal wells, create a map of faults, found the relationship between the faults parameters and their impact on the stress changes in the area of interest, assessed the impact of changes in reservoir pressure during field development on the stress orientation, predicted direction of hydraulic fracture and formed recommendations on hydraulic fracturing design taking into account possible variations in the stress state of the sector of modeling.
Korelskiy, Evgeny Pavlovich (Schlumberger) | Ochirov, Gleb Olegovich (Schlumberger) | Kosareva, Marina Sergeevna (Schlumberger) | Chernyak, Vyacheslav Sergeevich (Schlumberger) | Peshkov, Igor Viktorinovich (Schlumberger) | Kosarev, Taras Igorevich (Schlumberger) | Sadykov, Lenar Alfatovich (Schlumberger)
Abstract Hydraulic fracturing as an approach of oil and gas recovery intensification in clastic formations has long been well known and recognized from technological and economical sides. However, in spite of the obvious advantages of hydraulic fracturing procedure, the method has its drawbacks which decrease the final oil and gas productions. One of these disadvantages is a fracture breakthrough into the adjacent layers with following water cut increase and reduction of cumulative oil and gas production and production rates. Bearing in mind the geological structure of the explorational targets in this paper, the problem becomes more relevant. The presence of an abnormally high formation pressure in the reservoir, which exceeds the surrounding shale's pressure, and the shale barrier, which does not provide a sufficient stress barrier, promotes possible breaks of fractures into the overlying water-bearing zone. Owing to the simulation of hydraulic fractures based on the geomechanical model, it was possible to implement the hydraulic fracturing strategy and planning, taking into account the understanding of the geomechanical parameters and the stress-strain state of the medium, in which it was possible to avoid breakthroughs of hydraulic fractures into the overlying water-saturated formation. In addition, it is shown that outwardly similar development objects may require radically different approaches to well completion.