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Horizontal Wells 2021
- Conference date: May 24-28, 2021
- Location: Online
- Published: 24 May 2021
41 - 60 of 68 results
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The assessment of the prospects for sub-horizontal wells based on the experience of the Achimov deposits development in the Urengoy oil and gas complex.
Authors I. O. Maltseva and V.A. GuznenkoSummaryA comparative analysis of horizontal well No. 1 and adjacent S-shaped wells with hydraulic fracturing was carried out in this work so as to assess the prospects of using a sub-horizontal structure with multi-stage hydraulic fracturing. In order to assess the effectiveness of horizontal opening with multi-stage hydraulic fracturing, a comparative analysis of field combined gas dynamic and gas condensate studies was carried out. Based on the results of the work, a conclusion was made about the effectiveness of using sub-horizontal wells with penetration through the Achimov formations and carrying out several stages of hydraulic fracturing for each formation separately.
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Drilling and well placement of uprising horizontal wells in multizone reservoirs of Turonian formation in Western Siberia
SummaryThe developed methodology is based on the reducing of geological uncertainty, the optimal positioning of the horizontal uprising wells in the target interval, an increase of Net to Gross ratio and, therefore, an increase in well productivity. The proposed integrated engineering solutions was successfully implemented in 50 horizontal wells.
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Machine learning methods for geological support in geosteering
Authors M.S. Pospelkov, E.V. Shkunov, A.V. Belousov, D.P. Proshutinsky, N.K. Kayurov and V.U. UlyanovSummaryIn order to more accurately predict lithology and the nature of saturation, as well as minimize the time to perform interpretation, it was decided to test machine learning algorithms. For solving such problems, the gradient boosting algorithm (GBoosting) showed the best efficiency.
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Multistage hydraulic fracturing's tailpipe with additional elements for the possibility of re-fracturing operations in horizontal wells
Authors A.R. Gayfullin, A.V. Ivshin, A.G. Kudiiarov, A.V. Churakov and I.G. FayzullinSummaryThere are no optimal solutions for re-fracturing in horizontal wells in JSC «Gazpromneft-Noyabrsneftegaz» this time because exist certain factors that complicate process repeated hydraulic fracturing. The authors proposed the idea of creating multistage hydraulic fracturing's tailpipe with additional elements on new horizontal wells. This configuration has next additional element: movable elements with a saddle, soluble balls, hydraulic fracturing sleeves, packer. The idea is to close existing sleeves and open new ones without additional impact on the formation and attracting expensive equipment. Advantages of such simple type of tailpipe: 1. There is no need to prepare the well for repeated multi-stage hydraulic fracturing. 2. Minimization of manipulations for drilling ports in a horizontal wellbore prior to hydraulic fracturing. 3. It eliminates the need to run additional two-packer systems to separate each interval during re-fracturing. 4. It solves the issue of targeted repeated hydraulic fracturing in the selected zones. 5. It can be used not only for re-fracturing purposes, but also for isolating water-cut intervals according to the research results. 6. Reducing the cost of the re-fracturing process due to the elimination of the lease of attracting a contractor with two-packer assemblies, lengthy workover well preparation to achieve equal bore diameter in the horizontal part of the well.
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Construction of Extended-Reach Wells (Bottomhole More Than 6000 m) in the North of the Perm Region
Authors K.A. Meshcheryakov, Yu.V. Fefelov and A.V. ShirokovSummaryThe results of drilling extended reach wells at one of the fields in the north of the Perm region are presented. The substantiation of the choice of the well design and the extended profile taking into account the peculiarities of the geological structure of the field is given. The problems that arose during the construction of the well and their solutions are described. The relevance of individual design of construction of extended reach wells is noted.
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Systematic Approach to Selecting Candidates for Multistage Repeated Hydraulic Fracturing in Horizontal Wells of RN-Uvatneftegaz
Authors R.A. Gatiyatullin, R.R. Baisov and V.T. KirshinSummaryThe share of horizontal wells with multistage hydraulic fracturing in the well stock of RN-Uvatneftegaz is increasing every year and this trend will continue for the next 5 years. At the same time, the well productivity significantly decreases, which leads to declining oil production. The most promising method for restoring oil production in horizontal wells with multi-stage hydraulic fracturing is repeated multi-stage hydraulic fracturing. An analysis was carried out and the criteria for the selection of well-candidates were determined.
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Key for Turon: an example of petrophysical modeling taking into account field development with horizontal wells
Authors A.Y. Bokarev and D.M. EzerskySummaryThe Turon is known for its complex reservoir rock structures. Evaluation of reservoir properties is greatly complicated not only by its structure, but also by the lack of high-quality core material. In such conditions, building a high-quality petrophysical model is complicated. The authors presented the work on the development of a petrophysical model based on the data of modern special logging methods, which make it possible to approach the core data in terms of the amount of information received while conducting measurements in downhole conditions. A key feature of the model is the fact that the field will be drilled with horizontal wells using logging while drilling technologies. The obtained universal model is capable to assess the reservoir properties of complex rocks of the Turonian age, taking into account the influence of gas, lithology and laminated structure of the formation.
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Gas-dynamic methods of well research as a tool for complex improvement of the efficiency of gas re-injection into the gas cap of the Novoportovskoe Oil and Gas Condensate Field
Authors Y.A. Podchuvalova, I.L. Chameev, E.A. Sherstoboev, E.P. Borisov and V.N. GrischukSummaryThe article presents an approach that allows to evaluate the efficiency of gas re-injection into the layers of the Novoportovskoe Field, detect the reasons of injection rate decrease, and analyze the impact of gas injection on the development of the oil layers. The method is based on gas-dynamic tests of wells. The development of the field began in the absence of outside gas infrastructure. For the purpose of rational utilization of associated gas, until the outside gas infrastructure is ready, it was decided to re-inject gas into the main reservoirs. The reservoirs are represented by fringes of the marginal and underlying type. There is a risk of a gas breakthrough to the producing wells. It is necessary to optimize the re-injection of gas in order to equalize the reservoir pressure profile and increase oil production. The current task is to monitor the re-injection of gas, targeted management of gas injection wells, which will allow to inject the necessary volumes and get additional oil production. Based on the assessment, measures are proposed to recover injection coefficients. Timely diagnosis of the causes ensures the rational use of associated gas by the planned gas injection well stock.
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Improving The Development Efficiency of Low-Permeability Reservoirs and Hard-To-Recover Reserves with The Introduction of Recoverable Liners Technology in Horizontal Wells with Multi-Stage Hydraulic Fracturing
Authors A.M. Ishkinov, I.N. Esipenok and A.F. MingazovSummaryObjective of the project is to introduce a new type of uncemented liner «Smart-liner» in wells with multistage hydraulic fracturing using the extraction of a part of the liner from the T1 zone to the adapter, in order to implement the 2nd horizontal wellbore with drilling from T1 with deviation in azimuth of the wellbore. This technology will increase the efficiency of the development of low-permeability reservoirs. The method assumes adaptation and revision of existing liners with multistage hydraulic fracturing assemblies with division of a single assembly into 2 parts. The first part with hydraulic fracturing sleeves is lowered into the horizontal wellbore, while it has a connecting unit for docking with the second part of the liner at T1. The second part is lowered on the next trip, while it has a connecting unit with the first part in the zone T1 of the well and has a removable liner hanger packer on the adapter head, which in the future will be possible to extract by the workover team. In the process of developing reserves, a moment comes after which the question of the implementation of the second horizontal wellbore is considered.
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Management of the development of the Tazovsky oil and gas condensate field with a thin oil rim of high-viscosity oil with a massive gas cap
SummaryThe PK1 formation of the Tazovsky NGCM is a massive gas deposit with a thin oil rim, underlain by water over the entire area The field development strategy provides for the simultaneous operation of the oil rim and the gas cap. The involvement of oil fringe reserves is supposed to be realized by a grid of horizontal and multi-hole wells (the length of the GS is ∼2000 m, the MZS is 4000 m). To draw in the gas cap reserves, it is proposed to introduce horizontal gas wells (length 1500 m)
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Horizontal wells of considerable length as the only possible solution for the cost-effective involvement of high-viscosity oil reserves in the development of the thin oil rim of the Tazovskoye field PK formation
SummaryIn general, the experience of the development of continental deposits shows that the approach to drilling should be iterative, i.e. accompanied by continuous analysis of the data obtained and improvement of further drilling technology and strategy as training and experience gain, development and operation of horizontal wells of considerable length and wells of more complex design (MZS, FB).
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Automation of the construction of geosteering models adapted for LWD data
Authors N.A. Palchikovskaya, A.S. Trushin, N.S. Ismagilov and E.V. VarzegovSummaryOriginal geosteering model i.e. simulated geological section contains uncertainty, that is reflected in the discrepancy between the model data along the horizontal well and the actual logs. In order to remove discrepancy geosteering specialists manually correct the structure of the section using specialized software. However, it is a laborious and time-consuming process,that is why the automation of the construction of geosteering models adapted for logging while drilling (LWD) data is actual nowadays. This paper presents an algorithm, which automatically corrects the structure of the section and provides the model, which is transformed in such a way that sampling along the well gives a synthetic log approximately coinciding with the actual log. The algorithm has additional functionality that allows to set the user's requirements to the final model.
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Goomechanics as part of integrated approach of HW drilling
More LessSummaryIn the age of digitalization and artificial intelligence, the main challenge is to provide a cross-functional integration: any updated data have to be considered by all team in order to reduce risk, time and cost. This article introduces case of drilling horizontal wells with integrated approach to optimize drilling performance in Eastern Syberia which reduced drilling time more than twice. Geomechanical model was used as integration tool of geophysical, drilling, logging, coring, testing and fracturing data.
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Feasibility study for optimizing the design of double-barrel wells of the D33 field on the Baltic Sea shelf
Authors N. V. Krivosheev, N. N. Krivosheeva, R. A. Shadchnev and D. N. SharapovSummaryDrilling of offshore oil and gas wells remains one of the most important activities of the Russian oil and gas industry in the coming years. The issue of geological exploration and the profitability of the development of offshore fields is still acute. The D33 field is located on the shelf of the Baltic Sea within the boundaries of the Baltic license area. The depth of the sea within the field varies from 60 to 80 m. The purpose of the work is to increase the efficiency of drilling wells and the profitability of the development of offshore fields by optimizing the design of double-barrel wells. Several schemes of drilling of the D33 field with the reconstruction of the well trajectories are proposed. Technical and economic calculations were performed, which resulted in optimization of the design of double-barrel wells at the D33 offshore field. The cost of well construction was estimated according to the basic and optimized version, the results showed that the savings in the construction of a well according to the optimized version will be 5.5%.
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Application of The Controlled Radial Drilling Technology in The Tournaisian Reservoir at PJSC «Tatneft»
Authors I.Z. Farkhutdinov, A.I. Bashirov, A.K. Abdullin, V.A. Makarenko and I.R. GalasSummaryIn October 2020, PJSC Tatneft carried out pilot work on drilling radial channels with subsequent acidizing at the Novo-Elkhovskoye field. This technology was tested in the Tournaisian carbonate reservoir. As a result, it was possible to more than double the productivity index of the wells and to increase the oil production rate at one of the two wells. At the same time, unforeseen factors were identified in the course of work for the second well, which made it possible to gain additional experience and revise the criteria for selecting a potential well stock. This article describes the work that was first carried out in the above productive formations. Based on the results of the work carried out, the set geological and technical tasks were completed, further pilot work is planned in order to determine effective methods and technology application boundaries. Terrigenous reservoirs are considered, as well as reservoirs with a thickness of 2.5 meters and higher. It is also planned to perform hydrodynamic simulation to determine the optimal length of channels in specific geological conditions, to assess technical and economic performance.
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Development of an approach for hydraulic fracturing operations and a decision-making methodology in the Sredne-Nazymskoye field
Authors A.M. Yanaev, A.I. Lisitsyn, P.V. Lupanov, D.A. Korobitsyn, V.B. Karpov and N.V. ParshinSummaryThe object of the research is the Upper Jurassic deposits YuK-01 of the Sredne-Nazym field. The main features of the Yak-01 Upper Jurassic deposits are the complexity of the structure of the deposits, high heterogeneity of properties along the section, lateral and ultra-low matrix permeability. Currently, it remains relevant to determine the approach to the development of hydraulic fracturing designs in the field. The main difficulty is the lack of research, which makes it difficult to find solutions at the design and execution stages. An incomplete set of well logging leads to the impossibility of building a correlation between well flow rates and hydraulic fracturing designs. At the initial stage of development, vertical wells were completed with hydraulic fracturing using a "standard" design. “Standart” design is an injection schedule of 30 tons of proppant with a constant increase in the concentration of proppant (hereinafter CSP), injected onto a cross-linked gel with a flow rate of 3.5–4.5 m3/min, which limited the possibility of changing other technological parameters’ hydraulic fracturing, such as: volume and viscosity of the liquid; the volume of the buffer stage; mass and concentration of proppant, etc. This article presents the developed approach to the design of hydraulic fracturing schedules in the Sredne-Nazymskoye field and the results of its application. Additional attention is paid to highlighting the process of developing hydraulic fracturing schedules, as a result of which the proposed approach was developed.
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Complex cross-segment modelling approach applying for productive increase of horizontal wells with multi-stage hydraulic fracturing in Achimov formation conditions
Authors D.I. Torba, A.I. Lisitsyn, A.K. Gula, A.V. Bochkarev, A.E. Glazyrina, Yu.S. Berezovskiy and D.V. MetelkinSummaryAchimov deposits development is always a challenging process that frequently requires application of innovative approaches. Horizontal drilling in non-uniform lithology is frequently accompanied by circulation, wellbore stability losses and other complications. Hydraulic fracturing stimulation does not always result in productivity increase, which reduces profitability of development. Due to the incomplete understanding of geological and geomechanical specifics of Achimov deposits, - formations with complex heterogenous structure, low permeability, presence of low-amplitude structural dislocations, - the controlled use of features of formation is hindered and, in turn, makes it necessary to develop an innovative strategy of their surveillance and stimulation. In purpose to optimize an existing development strategy of Achimov deposits in Vingayakhinskoe oilfield, we have developed and applied an approach involving complex cross-segment modelling. 1D and 3D geomechanical models have been built in view of the applied approach. Development of hydraulic fracturing designs, efficiency of which has been evaluated with respect to such reservoir modeling results as predicted production rate and cumulative production, have been the next step, performed for different geological and geomechanical conditions. Thus, the principal feature of applied approach is coupling between geomechanical modeling, complex multivariant hydraulic fracturing modeling and reservoir modeling with the target to maximize production.
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