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Horizontal Wells 2019 Challenges and Opportunities
- Conference date: May 27-31, 2019
- Location: Kaliningrad, Russia
- Published: 27 May 2019
21 - 40 of 74 results
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Individual Fracture Evaluation in Multiple Hydraulically Fractured Horizontal Wells by Well Testing and Production Logging
Authors E.I. Grishina and A.V. BuyanovSummaryThe Paper presented usage of Well Testing and Production logging in Horizontal wells in low permeability reservoirs. The obtained test results were reviewed in order to estimate parameters of each individual fracture and reservoir permeability using production contribution of each fracture by PLT and bottom-hole pressure and surface liquid rate of tested wells. Optimal testing technology and interpretation methodology is justified by numerical modeling.
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The Use of New Seismic Data Processing Methods to Predict Changes in Reservoir Properties During the Design of Horizontal Wells
Authors E. Anokhina and G. ErokhinSummaryThe new VPRTM seismic data processing method calculates various field attributes that allow you to take a fresh look at the usual section and more accurately estimate the parameters of the reservoir and also correct the trajectory of the horizontal wellbore. The relationship between data logging GK, NGK, PZ and caliper and the various parameters calculated by the method VPRTM, show high sensitivity to changes in petrophysical parameters in the reservoir.
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Horizontal Wells. Why Can’T Trust the Logging while Drilling Depth and Is It All Bad?
Authors A. Bokarev, I. Malikova, M. Lavrentyev and M. RizvanovSummaryThe theater begins with a hanger, and all measurements in a well begin with depth. Depth answers the simple question “Where?”. The location of pays, fluid contacts, and intervals of workover jobs - depth is responsible for all this. Traditionally, depth measurement tools are wireline cable or drill pipe. The error is different, as well as the mechanisms of its appearance. In vertical wells, measured by cable, as a rule, the problem of depth error is easily solved with a downlog. But in HAHZ wells the cable is used extremely rarely, logging while drilling is used. In this case, the error of depth measurement can reach up to 10-15 m of measured deoth and 3-5 m in vertical depth. Nomber of horizontal wells in Russia is growing every year, and today more than a third of wells drilled in Russia have a horizontal section. Adding to this figure - higly inclined wells, measured on pipes, we will get a significant reason to revise the problem of the depth measured on pipes and learn how to refine it. The purpose of the paper is to assess the factors that distort the depth while drilling and propose ways to refine it.
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Gas-Oil Contact Determination in Horizontal Wells while Interpreting Lwd Data in Pokur Formation
Authors I. Malikova, Y. Kosharnaya, A. Bokarev and M. LavrentievSummaryPetrophysical interpretation of Triple-Combo LWD in horizontal wells for Pokur formation of oil/gas-condensate fields of Western Siberia is associated with several uncertainties. The reason is the reservoirs of Pokur formation are characterized with high shale volume and therefore with low-contrast formation resistivity. In this case traditional approach to Petrophysical Reservoir Estimation of LWD data based on resistivity cutoff will not work accurately and consistently and more to the point, will not allow to detect fluid contacts in horizontal wells. Furthermore Triple-Combo log data in conditions of shaly reservoir will not demonstrate qualitative indicators of gas saturation such Neutron-Density crossover. However advanced Wireline logs in pilot well will allow to build a volumetric litho-fluidal model for the similarly-named formation and afterwards, applying this model to LWD data in horizontal wells, will allow to solve a fluid contacts detection challenge.
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Development of Complex Carbonate Reservoirs of High-Viscosity Fields with Systems of Adjustable Intervals of Horizontal Wells
Authors V.A. Sudakov, L.I. Minikhairov, D.K. Nurgaliyev, A.Sh. Miyassarov, R.R. Khuzin and D.A. SalikhovSummaryThis paper presents optimization of the well spacing, taking into account the injection of water at certain points in time, the potential breakthroughs of water from the WOC area and the geometry of the wells using reservoir simulation. It was shown an assessment of the technology effectiveness of separately-alternate work of the horizontal wells in complex carbonate reservoirs of the Bashkir stage based on reservoir simulation results. The efficiency of the proposed technology is shown in comparison with traditional methods of horizontal wells operation.
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First Advanced Mud Logging Measuruments in Russia
Authors A.A. Karev, A. Mingazov, M. Ivashin and A. TsiklakovSummaryAdvanced mud logging meusuruments was used on the field where fluid contacts between gas, oil and water hardly complicated on triple combo measuruments. This technology demonstrate rebost quantitative measuruments which was proved by sampling fluid tool.
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The Use of Digital Information Systems to Improve the Efficiency of Field Development Using Horizontal Wells
Authors R. Studinsky, R. Zulkarniev, R. Asmandiyarov and D. VorobyovSummaryTo calculate the efficiency of horizontal fracturing on horizontal wells, a module has been developed that allows to evaluate the effect of primary and repeated multiple fracturing.The module takes into account the increase in the number of stages of multiple fracturing, the half-length and width of the crack, allows you to assess the risks of breakthrough clay barriers and choose the best option of intensificationFor the selection of wells for sealing drilling, an algorithm was implemented to identify the undeveloped areas of the reservoir with the calculation of the effectiveness of geological and technical measures and the risk assessment in each zone.
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Features of the Wells at the Field. V. Filanovsky Under Conditions Complicated by Tectonic Disturbances and High Lateral Heterogeneity
Authors I. Khaliullov, M. Golenkin and A. AlekseevSummaryOil and gas condensate field im. V. Filanovsky is located in the Northern part of the Caspian sea, 150 km from Astrakhan. The field has been developed since 2016 by drilling horizontal wells from offshore platforms. Drilling of wells involves a number of risks, such as changes in the geological structure of the field, the presence of discontinuous tectonics, lateral heterogeneity, etc. For example, well # X demonstrated a high effectiveness of the implementation structure of works for well construction at OOO «LUKOIL-Nizhnevolzhskneft» using software Petroventkomplekt, allowing to solve a wide range of tasks as in the pre-simulation and in real-time.
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Development of Terrigenous Reservoirs Drilling and Completion Technology for Horizontal Wells
By I. NekrasovaSummaryThe complex of oil-based technological fluids is developed in ООО LUKOIL-Engineering in order to work with the productive formation presented water sensitive terrigenous rocks: invert-emulsion drilling fluid and waterless acid-micellar breaker are presented. The evaluation method of invert-emulsion filter cake destruction by breaking compositions is considered. Requirements to breaking compositions depending on the nature of the pollution zone are formulated. Methodological approaches to evaluating the impact of fluids on the reservoir properties are presented. This technological fluids complex has been used successfully in the fields of Perm region, the results of well hydrodynamic research methods have proved technical and economic efficiency for an integrated approach.
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Approaches to Justifying Combined Development Systems Based on Technology Maps (A Case Study of Np8 and J2-6 Reservoirs of Novoportovskoye Oil and Gas Condensate Field)
Authors R.R. Badgutdinov and I.V. PerevozkinSummaryAt the designing stage of Novoportovskoye field development, a decision was made to drill 1,000-1,500 m horizontal wells. In 2015-2016, the project team developed a technology plan that included an assessment of technological availability to drill complex design wells and selection of geological targets for testing and subsequent economic evaluation.
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Application of Gti Data on Terrigenous Strata of Western Siberia in Order to Increase the Efficiency of Well Placement and Optimal Placement of Hydraulic Fracturing Ports
Authors R. Minikeev, T. Rakhimov, N. Nebogin and R. ChyapukasSummaryIdeas about geological and technological research (hereinafter referred to as GTI) as the basis of a system for providing information for the construction of wells, solving a wide range of geological and technological problems at all stages of well construction. In this paper, we studied the methodology for analyzing GTI data, presented statistics of the correlation of the results obtained with GIS data and their interpretation, selected the optimal group of data analysis techniques at a qualitative and quantitative level. The main problem that has been touched in the work is the lack of information on the sections providing maximum inflows to the ports of the multi-stage hydraulic fracturing in horizontal wells. The statistical material on the flow profiles of 33 horizontal wells, geophysical data, as well as data of geological and technological studies of wells in the drilling process are considered.
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New Approach to Determine Saturation in Complicated Geological Conditions
Authors A. Zozuly, M. Miletsky, A. Mityagin, L. Urmatseva, V. Kuzakov and A. CheprasovSummaryThe comparison of two independent methods for determining the coefficient of oil and gas saturation is discussed. The most common method for estimating the coefficient of oil and gas saturation is the use of the Dakhnov -Archi equation, where input parameters are the porosity coefficients, resistance, and empirical coefficients m, n. When constructing a petrophysical model, especially when interpreting the nature of saturation, in horizontal wells it is necessary to take into account the influence of various factors on the logging data. Estimation of the oil and gas saturation coefficient may become more complicated in the case of low contrast of resistance between water-saturated zones and zones with the presence of hydrocarbons. In this paper, an example of successful resolution of a similar problem in a target interval with low resistance values is considered using the advanced set of logging methods in the drilling process. A detailed analysis of the data obtained during the drilling process made it possible to clarify the saturation coefficient in the low-resistance section, and also identify the saturation coefficient in areas with free water below the level of oil-water contact (OWC).
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Application of Horizontal Wells in Unconsolidated Reservoirs
By N. IvantsovSummaryField tests show that screens in horizontal wells limit the sand production, but do not prevent the destruction of rocks in the reservoir. The analysis indicates geomechanical issues are constantly occurring in the reservoir. In the process of water cut development while waterflooding, a sharp increase in sand production indicates geomechanical issues have place not only in near-wellbore zone, but also in remote areas of the formation. As a result of the rock destruction in the channels of filtration between wells, there is an accelerated increase in water cut, a risk of a water bypass event arises. Negative geomechanical issues, enhanced by reservoir heterogeneity and viscous instability of the displacement front, lead to a sharp decrease in sweep efficiency and eventually to decrease in final recovery. The performed laboratory geomechanical experiments and combined geomechanic-hydrodynamic modeling allowed to estimate geomechanical risks for different geological settings and to develop optimal modes of horizontal wells operation in the conditions of unconsolidated reservoir of the field under consideration
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Look behind the Borehole Wall. Resistivity Images while Drilling
Authors S. Kochneva, V. Sayfitdinova, V. Dunaev, V. Baryakh and V. PermyakovSummarySpecial characteristics of carbonate formations, i.e. complex structure of pore space, inhomogeneity of reservoir properties, etc. determine the processes of geological reserves allocation, field development and oil and gas production. For each perspective formation, it is necessary to adopt its own drilling strategy with optimized suit of geosteering methods. In this paper, several examples of well placement jobs for different stratigraphic units (Bashkirian stage, Tournai stage and the Famennian) with usage of resistivity images while drilling service were discussed. Trajectory change decisions depending on the position of sweet spots and in accordance with identified by the images structural dips were analyzed. Resistivity imaging while drilling service provides an opportunity of acquisition of high quality borehole wall images that could be used for a variety of tasks, such as for geological model adjustment in real-time, trajectory changes while drilling, etc. That method is very suitable for thin laminated formations (such as carbonates) and is irreplaceable in the palette of geosteering techniques.
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The Results of the Geophysical Work and the Introduction of A Multi-Sensor System for Permanent Monitoring of Horizontal Wells Novoportovskoye Oil and Gas Condensate Field
Authors V.O. Kosolapov, V.I. Virt, D.R. Bakhitov and R.R. BadgutdinovSummaryThe report describes the results of field and geophysical studies at the Autonomous field, the problems of oil and gas condensate field development, the importance of geophysical control over the development and implementation of multi-sensor technology for the registration of the wellbore in real time
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Well Treatment Formation Zone with Foaming Composition to Reduce Associated Gas Production in the Development of Oil and Gas Condensate Field
Authors D.R. Bakhitov, V.I. Virt, V.V. Ilikbaev, E.N. Pavlov and V.O. KosolapovSummaryThe results of the study is the gas-blocking properties of the compositions on the core are described. The hydrodynamic reservoir model is adapted to the study data. The simulation of well treatment with the use of different compositions and different volumes was carried out. The optimal design of well treatment was developed, according to which horizontal well were treated.
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Unconventional Approach to Resistivity Inversion for Real-Time Well Placement and Geosteering in Complex Geology
Authors A. Mosin, V. Mogilatov, I. Kuvaev and I. UvarovSummaryProactive geosteering involves having deep reading LWD measurements sensible to the surrounding formation and software for processing upcoming data in real-time. Electromagnetic (EM) measurements or resistivity measurements obtained from LWD EM tools contain sufficient information and are widely used in proactive geosteering. The iterative process of running forward modelling computations in order to obtain model parameters which are matching the real-time resistivity measurements is called deterministic inversion. Deterministic inversion method requires significant computing power and may result in slow performance on geosteering engineers’ laptops. This paper proposes to use unconventional approach to inversion (linearized inversion) that uses linear approximation of forward modeling in horizontally-layered formation based on modified Born and Doll approximation. Application of linearized inversion approach shows good performance and reliable results for real-time proactive geosteering.
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Close Proximity Well Monitoring and Potential Well-To-Well Collision Avoidance Technique Using Reservoir Mapping while Drilling
Authors N.E. Vedernikov, E.A. Bolychev, D.S. Leontev and A.S. ShakirovaSummaryGeological constrains quite often compel to drill wells with reduced center-to-center distance. Managing well to well collision risk is a complex challenge when the potential collision zone is located in the horizontal section of the well, with uncertainties in the range of +/- 20 m. Reservoir mapping technology was intended to be used as unconventional method to reduce the risk of collision to an acceptable level. This paper describes the non-traditional utilization of reservoir mapping while drilling technology. It would be of benefit when planning horizontal wells in close proximity, especially ones above/below one another as demonstrated in our case study. Case study is presenting the drilling horizontal well in 15 m center-to-center distance from completed horizontal well minimizing risks of collision and vertical uncertainty.
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Determination the Geosteering Difficulty Index (Gdi) and Well Classificaiont
Authors M. Golovchenko, K. Kudashov, V. Filimonov and T. RakhimovSummaryBased on 8000 drilled wells the critical factors were determined, influencing of geosteering efficiency, and their contribution were defined. The method of estimation of geosteering difficulty index (GDI) of horizontal wells is created. The classification of wells according to GDI were done, which will further allow us significantly optimize the resources in the planning and drilling of horizontal wells (design documents, time, personnel, composition of BHA, etc.) and improve the efficiency of geosteering.
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Optimize New Drilling in Uncertainty of the Geological Basis
Authors A.Y. Sentsov, I.V. Ryabov, N.S. Polyakova, A.A. Ankudinov and S.I. GrachevSummaryDrilling of horizontal wells is economically more efficient than drilling directional
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