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The article presents the geological structure and describes the history of the Bolshetirskoye oil field - one of the most prospective fields of the Irkutsk region. The Osinskian productive horizon is represented by weakly fractured limestones and dolomites of the pore-cavern type formed as a result of secondary processes from limestones. The formation is characterized by abnormally high pressure and a significant content of hydrogen sulfide. Conditions incompatible with further drilling occur when drilling a reservoir: absorption of the drilling mud and gassing. The article considers the types of geological complications obtained during well drilling and also their systematization has been performed. The results of identification of geological reasons of failure to meet a drilling deadline are given. The experience of managed pressure drilling (MPD) technology is described. The chronology of drilling horizontal wells No. 161 and 169 is presented. The obtained experience clarified the idea of the geological structure of the carbonate-halogen sedimentary cover of the Early-Cambrian age. Lateral and vertical geological regularities of the occurrence of complications are determined. It make possible to update the concept of wells drilling. The number of wells has been determined where technological innovations must be applied in order to successfully achieve the set geological tasks.
- Asia > Russia > Siberian Federal District > Irkutsk Oblast > Irkutsk (0.29)
- Europe > Norway > Norwegian Sea (0.25)
Analysis of sucker rod pumps operational problems in dually-completed wells (Russian)
Urazakov, K. R. (Ufa State Petroleum Technological University) | Nurgaliev, R. Z. (Almetyevsk State Oil Institute) | Belov, A. E. (Almetyevsk State Oil Institute) | Bikbulatova, G. I. (Almetyevsk State Oil Institute) | Davletshin, F. F. (Bashkir State University)
The PDF file of this paper is in Russian. Today, the dual completion of wells with sucker-rod pumping units has become widespread, which allows to significantly increase the technical and economic efficiency of development by combining the facilities in operation. The peculiarities of mechanized oil production in this category of wells are due to a number of common complications arising during the operation and contributing to an increase in the intensity of pumping equipment operation and a decrease in the turnaround time, a decrease in well flow, which leads to a decrease in the efficiency of production in general. In these conditions, the most important tasks of cost-effective development are maintaining in working condition and ensuring optimal operating conditions for pumping equipment. The article presents a mathematical model of a sucker-rod pumping unit for the dual completion, taking into account complications in the operation of downhole equipment. The proposed model due to a detailed account of the mechanism of formation of downhole processes allows to simulate the effect of complicating factors, such as the effect of gas, high viscosity of pumped products, leaks in valves, etc. By modeling the dynamograms, considering complications and malfunctions in the operation of the pumping unit, the analysis of the influence of complicating factors on the configuration of the model dynamograms was carried out. The proposed mathematical model can be used as a tool for diagnosing the technical condition of sucker-rod pumping units from the actual dynamogram by comparing it with the model ones.
Proactive approach to improving the efficiency of real-time well drilling support and management (Russian)
Rustamov, I. F. (Gazprom Neft PJSC, RF, Saint-Petersburg) | Cherepanov, A. V. (Gazprom Neft PJSC, RF, Saint-Petersburg) | Kulakov, K. V. (Gazprom Neft PJSC, RF, Saint-Petersburg) | Makarov, V. A. (Gazpromneft NTC LLC, RF, Saint-Petersburg) | Esipov, S. V. (Gazpromneft NTC LLC, RF, Saint-Petersburg) | Balan, D. I. (Gazpromneft NTC LLC, RF, Saint-Petersburg) | Koryabkin, V. V. (Gazpromneft NTC LLC, RF, Saint-Petersburg) | Cherevko, S. A. (Gazpromneft-Khantos LLC, RF, Khanty-Mansiysk) | Olimpiev, S. A. (Gazpromneft-Angara LLC, RF, Saint-Petersburg)
The PDF file of this paper is in Russian. Prevention of accidents and complications in the process of wells drilling is a cornerstone task. It is impossible to achieve the maximum efficiency of drilling operations without solution of this task. The solution of this task depends on many factors, key of which are applying relevant resources of collection, storage and processing information from rig site; unity of engineering services involved in the drilling process; standardization of procedures and the high degree of automation of processes during well construction; applying of advanced techniques in the field of well construction technologies; engineering support around the clock. Responsiveness to the signals about possible complications in the early stages depends on the skills of drilling engineers, coherence of their interaction, used communication tools and applying of contemporary software for the real-time drilling operations support around the clock. The efficiency of processing of real-time drilling data multiple significantly increased due to intensive development of information technologies, creation of preventive alert systems, development specialized engineering software, improvement stations of mud loggers. That allows drilling engineers to analyze a wide range of incoming signals about drilling efficiency and possible complications, react to these signals in good time and provide high efficiency of the project at each stage. Continuous work on the prevention of accidents and complications in the process of drilling a well, based on the search for and testing of new techniques and technologies that enables the company to maintain its leadership in operational efficiency.
Breakthrough in Field Development Planning of a Complex Reservoir by Designing and Drilling Highly deviated Wells Using Integrated 3D Geomechanics.
Azim, Shaikh Abdul (Kuwait Oil Company) | Al-Awadi, Abullah (Kuwait Oil Company) | Hussain, T. (Kuwait Oil Company) | Al-Blayyes, Mariam (Kuwait Oil Company) | Al-Anezi, Salah (Kuwait Oil Company) | Al-Saad, Bader A. (Kuwait Oil Company) | Imtiaz, Saad (Baker Hughes) | Shinde, Ashok (Baker Hughes) | Perumalla, Satya (Baker Hughes)
Abstract Zubair Formation is the deepest producing Cretaceous reservoir in North Kuwait. This 1,400 ft thick formation was deposited in deltaic to paralic depositional environment with complex sand/shale sequence, structural geometry, mineralogical composition and lateral extent. Drilling wells of any profile has witnessed high non-productive time due to severe wellbore instability issues in the form of stuck pipes, tight holes, hole pack-offs and jarring/fishing operations. So, a number of vertical wells were drilled to drain the reservoirโ an economic challenge. Current strategic goal in this matured reservoir is to exploit multiple but thin pays by maximizing reservoir contact with high angle multi-lateral wells. An integrated 3D Geomechanics study was carried out in two phases. In the first phase, responsible failure mechanisms for wellbore instability were identified: stress induced breakouts, washouts and cavings, failure and fluid invasion associated with shale bedding planes at high deviation and osmotic pressure transmission between Zubair shales and drilling fluid system. Water sensitivity of clays and presence of micro-fractures were also studied on cores of this trouble making formation. In the second phase, calibrated well based 1D Geomechanical models; 3D structural model with high definition faults, facies models indicating lithological changes and drilling experience of latest high angle wells were integrated into a 3D Geomechanical model. The 3D model was tested with data from several offset wells and it was capable of explaining the wellbore failure of these wells. This 3D geomechanical model also helped in predicting mud weight window for any proposed high angle well trajectories. Mitigation measures from the study included drilling with Oil Based Mud or High performance water based mud systems with model derived mud weights, micronized sealing polymer to seal-off the laminations and micro-fractures, marble grade Calcium carbonate or resilient graphite to plug wider fractures and high salinity of mud to avoid time-sensitive osmotic flow. After implementing these recommendations, six horizontal wells have been drilled successfully. The study has given further confidence to implement an aggressive field development plan for optimal depletion. The paper discusses complex reservoir architecture, drilling complications and how the integrated study helped to achieve a breakthrough in development planning.
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (1.00)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying (0.93)
- Asia > Middle East > Kuwait > Jahra Governorate > Arabian Basin > Widyan Basin > Raudhatain Field > Upper Burgan Formation (0.99)
- Asia > Middle East > Kuwait > Jahra Governorate > Arabian Basin > Widyan Basin > Raudhatain Field > Mauddud Formation (0.99)
- Asia > Middle East > Kuwait > Jahra Governorate > Arabian Basin > Widyan Basin > Raudhatain Field > Lower Burgan Formation (0.99)
- (8 more...)
Effect of rock fracturing on elastoviscoplastic displacement of borehole walls (Russian)
Moguchev, A. I. (Ufa State Petroleum Technological University, RF, Ufa) | Gubaidullin, A. G. (Ufa State Petroleum Technological University, RF, Ufa) | Lobankov, V. M. (Ufa State Petroleum Technological University, RF, Ufa) | Belyaeva, A. S. (Geofizika NPF OAO, RF, Ufa)
The pdf file of this paper is in Russian. The article the problem of elastoviscoplastic wall displacements of deviated and horizontal wells in time in the isotropic massif of rocks with a overburden load is considered, taking into account influence of a jointing of rock on its physical and mechanical properties. The solution of a task is executed based on results of earlier published works of authors and geomechanical model of the rock developed by M.M. Iudin. The computer program in MS Excel is developed for performance of calculations of elastoviscoplastic wall displacement of deviated and horizontal wells. The dependence of elastoviscoplastic wall displacements of deviated and horizontal wells in time has two characteristic areas: area of elastic deformation and area of visco-plastic deformation. In deviated (an inclination angle more than 300) wells the elastoviscoplastic displacement on the top wall is more right than on the module in two and more times exceeds elastoviscoplastic displacement of a sidewall that in turn, leads to change of a form of cross section of a borehole from round to the elliptic. The elastoviscoplastic displacements of side and top walls of the deviated and horizontal wells linearly increase with growth of the jointing module. Similarly, elastoviscoplastic displacement of side and top walls of the deviated and horizontal wells are directly proportional to coefficient k, depending on width of disclosure of the crack and the relative area of the actual contact of surfaces of a crack. Results of researches can be applied to the prediction and the prevention of complications as at a design stage of construction of wells, so in the course of drilling operations.