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Collaborating Authors
Results
Experience in 3D Geomechanical Modeling, Based on One of the West Siberia Oilfield
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 โ 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.
- Europe > Norway (0.47)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District (0.37)
- South America > Venezuela > Zulia > Maracaibo Basin > Mara Oeste Field (0.99)
- Europe > Norway > North Sea > Central North Sea > Central Graben > Block 2/8 > Valhall Field > Tor Formation (0.99)
- Europe > Norway > North Sea > Central North Sea > Central Graben > Block 2/8 > Valhall Field > Hod Formation (0.99)
- (12 more...)
4D Geomechnical Model Creation for Estimation of Field Development Effect on Hydraulic Fracture Geometry
Pavlov, Valeriy (Schlumberger) | Korelskiy, Evgeny (Schlumberger) | Butula, Kreso Kurt (Schlumberger) | Kluybin, Artem (Schlumberger) | Maximov, Danil (Schlumberger) | Zinovyev, Alexey (Schlumberger) | Zadvornov, Dmitriy (Schlumberger) | Grachev, Oleg (Schlumberger)
Abstract A 3D geomechanical model was constructed to estimate the influence of the initially placed propped fractures and the pressure variation with time in active field development on the stress-state redistribution. The main task of paper was to research the different parameters influence on stress state condition and especially on possibility of stress reorientation due to field development. In addition, the main purpose of the paper is to fiend impact of acting processes on hydraulic fracturing propagation. A finite element method was applied to calculate the stress state in a target sector of the oil field. All available seismic data and pertinent well logging data were used to update the geological and hydrodynamic models, and data from hydraulic fracturing, 1D geomechanical modeling, and drilling history were used for verification of the modeling results. In the following paper the reservoir parameters which can be useful for other fields of West Siberia were used. The 3D geomechanical model was created and used for the stress-state redistribution forecast, taking into account the field development history. The model was built by coupling the geomechanical finite element and compositional numerical reservoir simulator result at two time steps โthe initial, virgin state and the current state of the field development. It has been shown that the change in reservoir pressure has a significant influence on the value of the horizontal stress in the area of interest, whereas the change in stress orientation depends on the reservoir height, layout of wells, field development stage, and mechanical properties of the rock. Near the initial fractures, the fractures themselves have a strong influence on the magnitude and orientation of the horizontal stress.
- North America > United States (0.48)
- Europe (0.46)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.46)
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Borehole Geophysics (1.00)
- Europe > Russia > Southern Federal District > Astrakhan Oblast > North Caspian Sea > Middle Caspian Basin > Mangyshlak-Ustyurt Basin > Yuri Korchagin Field (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Block V > Urengoyskoye Field > Achimov Formation (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin > Nadym-Pur-Taz Basin > Block IV > Urengoyskoye Field > Achimov Formation (0.99)
- (3 more...)
Abstract Work is devoted to increase of efficiency of development of subgas oil deposits with the spreading water-saturated horizon. Increase of efficiency is observed due to decrease in volume of intake of gas and water in a production well at preservation enough big rates of selection of oil. The similar effect is reached by side track kickoff in a gas cap and a technology trunk in the water-saturated horizon. On the basis of the created model, operating modes of the "constraining" trunks, and also an optimum depression in an oil-extracting well have been chosen. At the same time for preservation of equilibrium system the received and drained gas was pumped back in a gas cap, considerable volumes of in passing extracted water were dumped to the water-bearing area.
Exploring through Fracturing in Eastern Siberia: Defining Gas Production Potential from Low-Temperature Sandstone of Chayandinskoe Field
Yudin, Alexey (Schlumberger) | Paskhalov, Maxim (Schlumberger) | Butula, Kreso Kurt (Schlumberger) | Astapenok, Vladimir (Schlumberger) | Vernigora, Denis (Schlumberger) | Gennadievich Kreknin, Sergey (Gazprom Geologorazvedka) | Pushnikov, Konstantin (Gazprom Geologorazvedka) | Zykov, Alexey (Gazprom Geologorazvedka) | Borovinsky, Yuri (Gazprom Geologorazvedka)
Abstract With reserves of over 1 trillion cubic meters, Chayandinskoe oil, gas, and condensate field (OGCF) is one of the strategic fields in eastern Siberia. The field is currently in the exploration stage. Geological properties of the formations vary significantly, and it is necessary to define appropriate methods of well construction and completion prior to switching to a field development stage. One of the prospective options is to implement hydraulic fracturing in low-permeability areas of the Chayandinskoe. A pilot stimulation campaign was executed in 2015โ2016 to test the efficiency of hydraulic fracturing in vertical wells and in one subhorizontal multilayer well. The geology of eastern Siberia formations is unique. In particular, producing formations of Chayandinskoe field have extremely low temperatures (8 to 13ยฐC) that require a principally different approach to fracturing fluid design compared to the majority of the operations in western Siberia. One challenge is to achieve a fluid that is stable but that can break within a few hours after the treatment. Laboratory research was a significant part of the project preparatory stage; enzyme breakers, in particular, were included to the recipe. Methane hydrate creation is another common challenge in these reservoirs; special inhibitors under high concentrations were integrated within the fluid formulation. Within two winter campaigns (a total of five fracturing stages), there were three wells stimulated. The Khamakinskiy producing formation was tested in all three wells, and the Botuobinskiy and Talakhskiy formations were tested in a subhorizontal well in 2016. Advanced logging suites were run in both the pilot and lateral holes of the wells to optimize fracture modeling and placement. This paper contains detailed description of the core and laboratory testing performed in the laboratory for fluid optimization. The specifics of completion of a subhorizontal well with a multistage stimulation assembly is described. In this well, premium ports were used to allow for selective interval isolation. Well cleanout and nitrogen kickoff via coiled tubing were done to minimize near-wellbore damage and prevent hydrate creation during fracturing fluid flowback. The flow profile was measured using a special multiphase imager run with fiber-optic-enabled coiled tubing. Results have shown that fracturing as a method of field development is effective, but requires a complex preparatory stage in the laboratory and further optimization to local logistics and geological conditions. The project is one of the first gas fracturing campaigns in eastern Siberia. The methods developed and the lessons learned in this project are of paramount value for future stimulation campaigns for field development in the region.
- Europe (1.00)
- Asia > Russia > Far Eastern Federal District > Sakha Republic (1.00)
- Phanerozoic (0.46)
- Proterozoic > Neoproterozoic > Ediacaran (0.46)
- Geology > Mineral (1.00)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.40)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Borehole Seismic Surveying (0.48)
Abstract The current state of the resource base implies an increase in deposits of objects with low and ultra-low permeability. In order to cost-effective production of layers reveal horizontal wells (HW) with a multi-stage hydraulic fracturing (MSHF) and wells network sealed, and introduced more stringent in-line system design. The rational development of formation in these conditions implies a complication develop control system that would cover the whole period of the wells. This paper describes an example of the development and implementation of such a system, wich is based on the methods of permanent hydrodynamic monitoring with the involvement of a wide range of geological and oilfield information. Development of the system began with the modernization of the methodology of interpretation of standard methods ofproduction data analysis (decline analysis). In particular, it was necessary to justify the algorithm for determining the number of working cracks fracturing - the main parameter affecting farm productivity with MSHF, and ambiguously defined directly on the results of well tests on traditional interpretation methods. The algorithm is based on solution of the direct problem of pressure field distribution in the reservoir on the numerical and analytical models of multi-fractured horizontal wells (MFHW), taking into account the different distances between the cracks, permeability, well length and cracks. Modeling was verified field experiments materials: hydrodynamic, geophysical and microseismic. The results of simulation on the model allowed us to develop an improved methodology for well tests interpretation. The basis of the method laid down in the actual fact of the formation of geological and technological conditions of the studied field pseudoradial two flow regimes, the first of which is associated with the influx of individual fractures, and the second with the influx of the entire trunk entirely. The ratio of seeming flow capacities, determined based on these modes, equals to the number of active fractures. The advantage of this method is, inter alia, the possibility in some cases, to abandon costly specialized studies (microseismic, special PLT), restricting only the interpretation of the results of well tests and use the additional field information (fracking fluid efficiency, proppant tonnage, etc.). The use of hydrodynamic monitoring permits to efficiently monitor field development during the entire life cycle of a horizontal well with multistage hydraulic fracturing: using advanced techniques of well test interpretation to justify start parameters according to the filtration properties and the energy state of the reservoir, the number of worcing fractures, scin, etc.; on the basis of the data of the filtering model to control the power state and quality of the connectivity throughout the life of the well; monitoring og wells interferation and effectively manage the reservoir pressure maintenance system; Forecast further operation of individual wells and well clusters on the field. The proposed algorithms have allowed describing in detail the operation of 40+ wells at one of the fields in Volga-Urals region, without additional testing, i.e. without production loss and extra expenditures. The novelty of the work is to establish an improved model of well test interpretation based numerical simulation and a representative sample of the results of well test, in conjunction with the additional commercial information. Implementation of the proposed control system has enabled more effective approach to the development of complex constructed object. This system allows little or no additional financial cost to implement measures to control mining.
- Well Completion > Hydraulic Fracturing (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Drillstem/well testing (1.00)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring (1.00)