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Collaborating Authors
SPE Russian Petroleum Technology Conference
Application of Oscillation Rheology Method to Studying Fracturing Fluids
Hiliazitdzinau, Tsimur Donalovich (RUE PA Belorusneft BelNIPIneft) | Valenkov, Andrei Mikhailovich (RUE PA Belorusneft BelNIPIneft) | Kazak, Maksim Vasilyevich (RUE PA Belorusneft BelNIPIneft) | Panin, Sergey Igorevich (RUE PA Belorusneft BelNIPIneft)
Abstract In this paper, rheological properties of fracturing fluid samples on polymer and non-polymer basis are studied. The interdependence between effective viscosity, viscoelastic properties and the proppant carrying capacity of the studied composite systems is shown. The advantage of using the method of oscillatory rheometry in the amplitude sweep mode when predicting the sedimentation rate of proppant is observed. The possibility of using this method to study viscoelastic properties of fracturing fluids,both on the basis of classical and alternative gelling agents, was experimentally confirmed.
Development of Hazard Assessment Matrix for Wells as an Industrial Safety Assurance Method When Designing Oil and Gas Well Construction
Shirieva, Nadezhda Sergeevna (KogalymNIPIneft, Branch of LUKOIL-Engineering LLC in Tyumen) | Shiriev, Artur Kamilevich (KogalymNIPIneft, Branch of LUKOIL-Engineering LLC in Tyumen) | Tlyasheva, Rezeda Rafisovna (Federal State Budgetary Educational Institution of Higher Education, Ufa State Petroleum Technical University) | Kafisov, Fanil Shamilievich (Federal State Budgetary Educational Institution of Higher Education, Ufa State Petroleum Technical University)
Summary The article considers statistical data on accident rate in oil production: types of accidents, accident distribution over constituents of the Russian Federation, number of fatalities, incident distribution over constituents of the Russian Federation. Causes initiating fire and explosion hazardous situations on a drill site are studied. Executed analysis of statistical data clearly demonstrates that accident rate and fatal injuries in the industry still remain at high level, therefore necessity to develop scientifically validated methods for assessment of well hazards from various condition is relevant. In its turn, it will enable to promptly provide preventive measures aimed at assurance of the required industrial safety level. As drill sites belong to hazardous industrial facilities (HIF), when managing industrial safety, at construction design stage, it is necessary to carry out accident risk analysis in order to identify hazards and undesired events. According to the analysis of problem statistics, criteria that influence on occurrence probability of problems initiating fire and explosion hazardous situations, as well as the factors, on which severity of accident consequences depend, are determined. As a result of the work executed a method for calculation of quantitative risk assessment indices that considers well construction conditions is proposed on the basis of the developed well hazard level matrix. The proposed approach can be applied to forecast risk level for any territory when using initial data on accident rate of the specific field or group of fields.
- Europe > Russia > Volga Federal District (1.00)
- Asia > Russia (0.88)
- Asia > Middle East > Israel > Mediterranean Sea (0.25)
Results of Implementing An Integrated Approach to Modeling, Planning and Conducting of Hydraulic Fracturing on Bazhenov Shale
Korobitsyn, Dmitri Andreevich (MIPT Center for Engineering and Technology LLC) | Yanaev, Aleksey Mirzoevich (MIPT Center for Engineering and Technology LLC) | Bochkarev, Alexander Vladimirovich (MIPT Center for Engineering and Technology LLC) | Erofeev, Artem Alexandrovich (MIPT Center for Engineering and Technology LLC) | Prodan, Artem Sergeevich (Technology center Bazhen LLC) | Bukov, Oleg Vladimirovich (Technology center Bazhen LLC) | Migunov, Nikolay Mihaylovich (Technology center Bazhen LLC) | Milkov, Alexander Yurievich (Technology center Bazhen LLC)
Abstract During the Bazhenov shale development, a new integrated approach to planning the multistage hydraulic fracturing was developed. This approach is applied to each drilled well,thus implementing the strategy of technological experiment, where the well serves as a separate testing ground for testing the developed methods and implementing new technologies.With the help of modern multistage hydraulic fracturing modeling tools, developed jointly with technological partners for the project tasks, a technological experiment plan is drawn up for the well and contains new,potentially effective solutions, as well as the already accumulated experience. In accordance with the developed plan,the multistage hydraulic fracturing operation is modeled, taking into account the geological and geomechanical features of the object, such as lateral and zonal heterogeneity and the existing natural fracture zones. Using the developed approach, multistage hydraulic fracturing operations were performed on more than 25 wells drilled at the Bazhenov shale, which is equivalent to 450 well operations.During this time, various technological solutions have been developed, tested and implemented,which include the use of new hydraulic fracturing fluid samples, the selection of optimal well perforating scheme,the use of combined proppant packs and hydraulic fracturing using mainly low-viscosity fluids.Active use of specialized software for modeling the hydraulic fracturing process and close cooperation of software developers with hydraulic fracturing engineers has led to the expansion of the functionality of the developed software product, improving its quality, convenience and stability of operation. According to the initial assessment,the implementation of the technological experiment strategy in conjunction with the use of specialized software led to a reduction in drilling hazard mitigation during multistage hydraulic fracturing operations,as well as to an increase in accumulated oil production by an average of 37 %.A database of knowledge and individual,successful technological solutions available for use in similar projects has been created. Due to the Bazhenov shale unique structure and properties,it was necessary to adapt existing solutions in the industry for conducting multistage hydraulic fracturing in ultra-low layer permeability.The process of searching and creating new technologies, tools for modeling the multistage hydraulic fracturing process and analyzing the results was also successfully initiated. The developed approaches have already shown their effectiveness, and the work results can be replicated on subsequent wells, as well as on similar objects.
- Information Technology > Software (0.34)
- Information Technology > Artificial Intelligence (0.34)
Abstract The study purpose is to identify and describe the psychological safety features of oil workers in the south and north of the Russian Federation. The study was conducted on an offshore ice-resistant platform, the Caspian Sea, 50 people took part (shift duration - 14 days) and an oil and gas field in the Far North, where 70 people participated (shift duration - 28 days). The research method is a questionnaire. The questionnaire developed by us included the following sections: general information about education and work experience; marital status; subjective assessment of the adverse climatic, geographical, industrial and social factors that affect workers during a shift period; features of the organization of free time during the shift period; subjective assessment of their professional effectiveness and professionalism; subjective risk assessment of various situations that may arise during the shift period; subjective assessment of the danger in the workplace and the factors contributing to its formation. The results obtained allow us to conclude that for workers of both industrial facilities regarding the feeling of safety during the shift period, production factors and situations play an important role. Climatic and geographical factors enhance the effect of exposure to extreme production conditions. A comparative analysis found that the severity of the hazards in the workplace is higher among employees of the offshore platform. Safety at this facility is limited by a large number of factors that are more intense.
Abstract Outstanding HSSE performance is an ambitious goal set forth by the energy sector globally. Salym Petroleum has developed variety of systems and rules to achieve an incident free oil production over the past decades. However, we continue to miss our Goal Zero delivery. In many interventions and investigations on unsafe activities or incidents we discover that systems and rules are not consistently followed by responsible personnel. In such cases people's attitude, knowledge and skills are considered the deficient line of defense. And that is why trained and competent employees are integral to our critical safety barriers against a major hazard release. To become successful in Company's Goal Zero pursuit we need to be 100% sure that our people know, understand and have the right leadership and technical skills for the HSSE critical activities and roles they perform, manage or supervise. The above is achieved through HSSE Competence Framework implementation. The paper will provide progress overview on the four corner stones of the Company's HSSE competence process: –compliance, –development, –assurance, –digitalization. We will share the lessons and results of our current practical and focused efforts to make all four elements work including our own digital solution. Salym Petroleum developed and launched a unique HSSE Competence portal which combines the national legislation rules, internal corporate expectations and shareholder's best practice approach. The portal supports each step of the HSSE Competence process: –sets competence matrix requirements for the entire Company; –links them with the employees' individual competence profiles/accounts; –contains a calendar to schedule and signup for the training and assessment events; –provides a reporting tool.
- Asia > Russia > Ural Federal District > Khanty-Mansi Autonomous Okrug > West Siberian Basin > Central Basin > Salym Field > Verkhne Salymskoye Field > Vadelypskoye Field > Zapadno Salymskoyeskoye Field (0.99)
- Asia > Russia > Ural Federal District > Khanty-Mansi Autonomous Okrug > West Siberian Basin > Central Basin > Salym Field > Verkhne Salymskoye Field > Salymskoye Field > Zapadno Salymskoyeskoye Field (0.99)
- Asia > Russia > Ural Federal District > Khanty-Mansi Autonomous Okrug > West Siberian Basin > Central Basin > Salym Field > Salymskoye Field > Vadelypskoye Field > Zapadno Salymskoyeskoye Field (0.99)
- (13 more...)
Abstract Production history fitting in Weiyuan shale gas shows that the length and height of supporting fractures are short, which limits the long-term conductivity of fractures. Due to the limited volume of reconstruction, the production decreases rapidly, which makes it difficult to achieve the purpose of economic and effective exploitation. In view of the above problems, an enhanced hydraulic fracturing technology (EHFT) which has been verified and applied is proposed to increase effective SRV. according to the different characteristics of shale reservoir, EHFT optimizs the performance parameter of fracturing fluid and matchs different modes of proppant injection, which can be classified in 4 major patterns, including modes of proppant injection in long/short slug type and densifying proppant injection in long / short slug type. First, based on brittleness evaluation and mineral composition, and combined with interpretation results of the natural fracture, the pumping plan is made according to the design goal. Then, modes of proppant injection is adjusted and optimized in real time through the construction curve and micro-seismic data during fracturing. The hydraulic fracture propagates along the dominant channel in the process of fracturing and there is the risk of the fracture communicating with the adjacent well. The fracture control technology of multi cluster perforating can effectively avoid it. Through field application, the following conclusions are drawn: (1) For reservoirs with high clay content, high viscosity fracturing fluid is recommended to improve the fracture width and reduce the complexity of construction; modes of proppant injection in long slugs of low concentration can control the construction scale, improve quality of proppant per meter, establish continuous fracture support and improve the long-term conductivity; modes of proppant injection in short slug type can control the fluid loss and avoid the occurrence of complex conditions, which is especially suitable for reservoir with natural fracture. (2) In the process of fracturing, the combination of various modes can achieve good results through real-time analysis and judgment. (3) The effectiveness of EHFT is verified by construction parameters, fracturing curve and micro-seismic monitoring. The construction scale (total volume of fracturing fluid) is reduced by 10%; quality of proppant per meter is increased by 10-20%; the fluctuation range of construction pressure is controllable/small; and the SRV and micro-seismic events are significantly increased. (4) The test production of well A which is the highest in Weiyuan is 71.2×10m with this technology. EHFT is suitable for the complexity of shale reservoir reconstruction. Multiple modes of real-time control can reduce the occurrence probability of complex conditions, improving the effective SRV and achieving efficient fracturing. Most importantly, the technology is feasible and effective in the overall goal of cost reduction and efficiency increase
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (1.00)
- Geology > Mineral (1.00)
Alternative Fracturing Fluids: Expanding the Field of Possible Applications and Properties of Hydrophobically Modified Polyacrylamide
Aleshina, Anna Leonidovna (Lomonosov Moscow State University, Moscow, Russia) | Shibaev, Andrey Vladimirovich (Lomonosov Moscow State University, Moscow, Russia) | Philippova, Olga Evgenievna (Lomonosov Moscow State University, Moscow, Russia) | Osiptsov, Andrei Alexandrovich (Skolkovo Institute of Science and Technology (Skoltech), Moscow, Russia) | Shel, Egor Vladimirovich (LLC Gazpromneft STC, St. Petersburg, Russia) | Paderin, Grigory Vladimirovich (LLC Gazpromneft STC, St. Petersburg, Russia) | Saifutdinov, Elnar Faridovich (LLC Gazpromneft STC, St. Petersburg, Russia) | Churakov, Artem Vladimirovich (LLC Gazpromneft STC, St. Petersburg, Russia) | Fayzullin, Ildar Gayazovich (LLC Gazpromneft STC, St. Petersburg, Russia)
Abstract In this paper, the properties of an alternative fluid for hydraulic fracturing (HF) technology based on hydrophobically modified polyacrylamide (HM-PAAm) are studied. HM-PAAm forms gels as a result of cross-linking of polymer chains by hydrophobic domains. Such cross-links are strong enough to impart resistance to temperature, but they can break and recombine under external influences, which makes it possible to restore properties after strong mechanical shear stresses. In the work, the influence of polymer concentration, temperature, and shear rate on the rheological properties of the gels was studied and the conditions for producing gels promising for use in hydraulic fracturing technology were determined.
- North America > United States (0.46)
- Europe > Russia (0.29)
- Asia (0.29)
Advanced Pressure Monitoring Technique – New Horizons of Workover in Russia
Borisenko, Alexey (Expert) | Parkhonyuk, Sergey (Schlumberger) | Zotov, Kirill (Schlumberger) | Korkin, Roman (Schlumberger) | Kiselev, Nikita Vladimirovich (Schlumberger) | Laptev, Artem (Schlumberger) | Rapeyko, Vitaly Tadeushevich (Schlumberger)
Abstract In the case of many workover operations associated with fluid loss inside the well or multistage refracturing, one of the most significant uncertainties is the fluid entry point. Starting from uneven depletion of the horizontal part of the well, not knowing the fluid entry point may lead to ineffective well restimulation and absence of any positive effect. In this paper new technique will be reviewed for several locations across Russia. Implementation of high-frequency pressure monitoring (HFPM) method and based on it, Well Watcher Stim technology, allows locating downhole events caused during well workover and refracturing without interruption of the well stimulation operations. The high frequency pressure monitoring technology is based on automatic processing of wellbore pressure oscillations recorded at the wellhead. The wellbore completion elements such as hydraulic fractures, casing diameter changes or wellbore restrictions serve as effective reflectors for the tube waves. In this paper, we will demonstrate an integrated approach to the utilization of high-frequency pressure monitoring technique, which has served as an engineering tool for fluid entry point validation in the projects all across Russia. The project validated the intrinsic benefits of the new approach in solving uncertainties about the fluid entry point. The Well Wacther Stim technology requires minimum changes in operational procedures, is easy and safe to install and provides real-time answers that allow the frac engineer to take decisions on location and optimize the re-fracturing process Selected stimulation approach enables the horizontal well refracturing operation to be concluded within 2-3 days, minimizing well intervention operations and reducing the overall costs and risks of the restimulation. The selected workover approach demonstrates reliable technique for fluid loss extensional control in well workover. One of the opportunities which is became available with high-frequency monitoring is analyze of conditions of well construction and downhole equipment. That was practically confirmed at a well with completion for multi-stage fracturing. Suspicion about damage of casing or sliding sleeves and corrosion of isolation packers was verified and localized. Further application of Well Watcher Stim made possible to decrease leakages by conventional reservoir dynamic fracture diversion technology and provide multi-stage fracturing with constant control of identified zones. This paper presents case studies of the technology that was used widely in Russia in the recent years proving reliability of high-frequency pressure monitoring technique. It will provide meaningful insight for the petroleum engineer who will look after solving uncertainties during well workover operations and refracturing.
Acidizing Combined with Heat Generating System in Low-Temperature Dolomitized Wax Damaged Carbonates
Folomeev, Aleksey Evgenyevich (RN-BashNIPIneft LLC) | Magadiev, Azat Failievich (Bashneft-Dobycha LLC) | Khatmullin, Arslan Rustemovich (RN-BashNIPIneft LLC) | Taipov, Ildar Azatovich (RN-BashNIPIneft LLC) | Vakhrushev, Sergey Aleksandrovich (RN-BashNIPIneft LLC) | Galiev, Timur Railevich (RN-BashNIPIneft LLC) | Mukhametov, Flyus Khanifovich (RN-BashNIPIneft LLC)
Abstract The article demonstrates the results of experimental and field studies of the thermal foam-acid treatment technology with the use of water solutions of heat and gas generating system. The potential temperature of the heat-generating reaction upon mixing of agents was estimated in laboratory conditions and the physical and chemical properties of acid solutions were determined. A series of filtration experiments was conducted on treating dolomitized core samples with a basic hydrochloric acid solution.The constant of the rate of reaction between the basic acid solution and dolomitized carbonate rock was determined based on the experiment results. The article provides a brief analytical overview of world experience of the thermochemical treatment of the bottomhole area. The technology selected for the tests called thermo-foam-acid and implies the step-by-step injection of water heat and gas generating solutions with an addition of surfactants and an initiator into the bottomhole area. The heat-generating reaction is accompanied by the generation of a large amount of heat, gases and hot foamed acid. Heating melts high molecular weight oil compounds, washes oil sheen from rock surface and increases the speed of its dissolution with hydrochloric acid. This foam acts as a diverter for the next portion of active acid and prevents undesired stimulation of high-permeability interlayers and fractures. Surfactants in the acid solution increase its ability to penetrate pores and microfractures. The physical modeling of a thermal foam-acid treatment has been performed. Arlanskoe (Kashirskian-Podolskian deposits) and Nadezhdinskoe (Famennian stage) fields where carbonate formations are characterized by high and increased oil viscosity, low reservoir temperature, fractured and dolomitized reservoirs were selected as a site to perform field tests. Well operation at these formations is complicated by the precipitation of asphaltenes, resins and paraffins in the bottomhole area. Solution injection parameters were recorded during treatments based on this technology. The technological efficiency of this treatment was confirmed based on bottomhole pressure and temperature changes during injection operations. Technology efficiency was analyzed and the well flow rate was monitored based on the field test results. The main stages of this work are shown in Figure 1.Figure. 1: Project stages
- Asia (1.00)
- Europe > Russia > Volga Federal District (0.46)
- Europe > Norway > Norwegian Sea (0.44)
- (5 more...)
- Energy > Oil & Gas > Upstream (1.00)
- Materials > Chemicals > Commodity Chemicals > Petrochemicals (0.68)
- South America > Brazil > Bahia > Reconcavo Basin > Dom Joao Field > Sergi-Água Grande Formation (0.99)
- South America > Brazil > Bahia > Reconcavo Basin > Dom Joao Field > Sergei Formation (0.99)
- Europe > Russia > Volga Federal District > Bashkortostan > Volga Urals Basin > Arlanskoye Field (0.99)
- (12 more...)
Features of Killing Wells Operating Fractured Formations with Abnormally Low Formation Pressures and High Gas Factor
Shaydullin, Vadim Aleksandrovich (RN-BashNIPIneft LLC) | Vakhrushev, Sergey Aleksandrovich (RN-BashNIPIneft LLC) | Magzumov, Niyaz Rinatovich (RN-BashNIPIneft LLC) | Yanson, Sergey Olegovich (RN-BashNIPIneft LLC) | Akhmerov, Ilgam Anvarovich (Bashneft-Dobycha LLC)
Summary The article describes the development of a technology meant to kill wells in fractured carbonate reservoirs of the Republic of Bashkortostan with abnormally low reservoir pressure (ALRP) and high gas-oil ratio. Initially, various technologies were tested in wells to solve this problem: invert emulsion muds, biopolymer solutions, crosslinked gels and water-swellable polymers. However, they demonstrated low efficiency. A new killing technology based on a foam-gel system was selected and adapted to the existing conditions to enhance killing efficiency in complicated geological conditions. Successful tests were performed in three wells of reef fields with ALRP.