- Home
- Conferences
- Conference Proceedings
- Conferences
Horizontal Wells 2021
- Conference date: May 24-28, 2021
- Location: Online
- Published: 24 May 2021
21 - 40 of 68 results
-
-
An automate approach of optimal pad arrangement for horizontal wells in bitumen deposits
Authors T.A. Murtazin, A.D. Yarullin, V.A. Sudakov and V.K. GataullinSummaryThis paper discusses an approach to automate the process of optimal pad arrangement for horizontal wells in bitumen deposits, to reduce the total costs of surface infrastructure. The authors proposed methods for determining the positions of horizontal wellheads, combining them into well pads and design the well profiles. When combining wells into groups, surface and technological limitations are taken into account.
-
-
-
Elaboration of criteria for laying wells of the operating stock of the Riphean carbonate reservoir in the central part of the Kamovsky arch of the Baikit anteclise based on 3D seismic data
Authors S.S. Soshnikov and E.N. CherepanovSummaryThe object of this work was a large oil and gas condensate carbonate field in Eastern Siberia. The target interval at the field is the riphean reservoirs, which are represented by an impermeable carbonate matrix permeated by a dense network of micro-macro cracks of various orientations, caverns and leaching intervals. The affected area was subjected to an active and multi-stage tectonic impact, which led to the widespread development of numerous low-amplitude, sub-vertical faults and fracture zones of a predominantly shear nature. The main intervals of the section are represented by the Archean basement, Proterozoic (Riphean-Vend), Paleozoic (Cambrian, Ordovician, etc.) and Upper (HCR) parts of the section. The Paleozoic part of the section consists mainly of Cambrian carbonate-halogen-sulfate rocks and traps, presumably of Triassic age. The wave pattern of the Cambrian rocks is characterized by relatively laterally sustained seismic reflections with a small number of interpreted faults. The shape of the wave pattern, or in other words, the seismic images/seismophations, are mainly high-amplitude, laterally sustained with increased reflection and impedance coefficients. Potential reservoirs in this part of the section are most often represented by relatively dense carbonates, which are characterized by a small number of secondary changes in carbonate rocks. The main risks when drilling GS are the presence of abnormally high absorption of drilling fluid (up to loss of circulation), the presence of tool failures, frequent wear of bits, the presence of silicification. More than half of the current fund of producing wells have a high gas factor or significant water cut. To solve the described problems, it was decided to create a number of criteria for laying horizontal wells, taking into account the seismogeological conditions of the section.
-
-
-
New Prospects of SAP Investigation using Multisensory Passive Spectral Acoustics
Authors A.A. Senkov, O.I. Abramenko, V.M. Nagimov and A.V. TrusovSummarySustained Annulus Pressure (SAP) monitoring on offshore stationary platforms plays an important role in the development of oilfields with the massive gas cap. Conventional SAP diagnostic techniques is significantly limited primarily by the complexity of unwanted flowpaths in annular space and the presence of multiple pipe barriers. Multisensory passive acoustics is the novel approach evaluating SAP. Several accurately synchronized high-definition acoustic sensors measuring acoustics wave time arrival shift of the signal generating by active flow source. To take into account acoustic wave reflections in multiple strings of well construction 3D modelling of acoustic propagation is applied. The logging campaign of five wells was surveyed using slickline. Both conventional single sensor and multisensory spectral acoustics were used in the same toolstring. The multisensory acoustic data indicated active SAP sources and estimated the distance to the SAP source and flowpath separately, differentiation of that is impossible using single sensor spectral acoustics data. As a result of the campaign multisensory passive spectral acoustic instrument demonstrated additional important features on SAP source identification over conventional single sensor spectral acoustics. The most important feature is the differentiation of SAP source and flowpaths behind multiple casings. This significantly improves workover planning on SAP source isolation
-
-
-
An Integrated Approach for Application and Operation evaluation of Autonomous Inflow Control Devices in Horizontal and Multilateral wells
By T. SolovyevSummaryThe article also describes general information about the inflow control devices technology, their characteristics and problems that the operators user may encounter when using one or another element of high-tech completion, gives reasons for the use of autonomous inflow control devices at the considered development object. Analysis of field data and PLT and well logs results revealed that the devices actually work and help to limit water and gas compared to wells that are equipped only with wire filters without inflow control, and also begin to form a unified strategy and concept of well completion based on the data The results of the work show that currently the use of AFCD for the project is favorable, and the completion of wells without flow control in these conditions is impractical.
-
-
-
Key Performance Indicators of Geomechanical Modelling
Authors P.V. Iastrebov and A.I. ArhipovSummaryGeomechanical modeling with regard to well construction process acts as a service and solves a set of issues related to the rock mechanics. Such tasks can be, for example, ensuring the borehole stability, multi-stage hydraulic fracturing, forecasting sand production, or reducing the risk of lost circulation and kick events. The process of a geomechanical model development implies the processing of a large amount of data, such as well logs, core studies, LOTs and XLOTs, hydraulic fracturing events in offset wells, etc. The effectiveness of geomechanical modeling depends largely on the quantity and quality of the input data. In this behalf, it is required to formalize and quantify the key performance indicators (KPIs) of geomechanical modeling, which will further regulate this process.
-
-
-
Laboratory studies application for mineral-geochemical characteristics of the Bazhenov formation of horizontal wells
Authors E.A. Vtorushina, E.S. Pivovarova, I.V. Afonin, A.E. Gavrilov and M.N. VtorushinSummaryMineralogical heterogeneity of rocks of the Bazhenov formation and lateral distribution of pyrolysis parameters are investigated along the horizontal wellbore in the territory of Krasnoleninsky upland. The highest content of clay minerals and pyrite corresponds to the interval V. There is a positive correlation between the amount of clay minerals, plagioclase and the zirconium and titanium content, the oxide forms of which should be interpreted as circon and rutile accessory minerals. At the intervals V-II oil saturation (the average oil hydrocarbon content is 6.5 mg/g rock) is fixed with the maximum oil saturation (16 mg/g rock) in the interval III. Total organic carbon content ranges from 3 to 11%. The comparison of pyrolysis characteristics with mineralogical composition allowed us to identify two types of organic matter within the well, which were assumed to differ in chemical composition and physical properties.
-
-
-
Multilateral wells as the way to increase profitability of Vikulskaya formation development
Authors A.V. Iakovenko, D.S. Lachugin, A.K Maltsev, T.Y Dolgushin, N.V. Kudlaeva and J.J. PolushinaSummaryWell 2 is 4 branches fishbone with total reservoir exposure 3100 m The drillability of final design decisions is proven and wells are brought into operations. The better result is shown by Well 1: the productivity index is more, then expected from numerical simulation. Extended well test is in progress. Build up test show, that 64% of well is in production"
-
-
-
Modeling the sedimentation rate of mechanical impurities in the horizontal wellbore
Authors M.F. Zakirov, R.F. Sharafutdinov, R.A. Valiullin and I.G. NizaevaSummaryThis work is devoted to the determination of the sedimentation rate of mechanical impurities depending on the particle diameter, as well as the assessment of such a process from the watering of the well production.
-
-
-
True stratigraphic thicknesses calculation and fault throw evaluation based on image log interpretation during geosteering on horizontal well of Y.Korchagin field (Caspian Sea)
Authors S.Y. Shtun, M.Y. Golenkin, M.V. Rakitin, D.V. Shtepin, A.F. Islamov, N.R. Shaymardanov, N.V. Ivanova and V.R. KuzakovSummaryHorizontal wells bring a lot of new practices in way of working with well data. For example, in the petrophysical interpretation of reservoir properties, 3D approach is used that allows us to take into account the effect of several layers simultaneously affecting on LWD measurement [ 3 ]. Geosteering team always shifts from measuring thicknesses (MT) to true stratigraphic ones (TST) by adjusting trajectories based on formation dips. During interpretation wellplacement engineers uses relable stratigraphic well tops to adjust formation dips for achieving better correlation with surrounding wells [ 1 , 4 ] (Figure 1). For understanding of formation dips LWD borehole images or deep-reading electromagnetic measurements are used. A new method of using borehole images interpretation for TST calculation, which allows to build more accurate geosteering model described in this article.
-
-
-
The importance of pinpoint horizontal well landing
More LessSummaryThe development of geologically complex fields with horizontal wells often requires the use of special technologies not only directly for drilling a well within the target interval, but also for well landing. This paper considers an example of the well landing special requirements with the aim of further successful drilling in the target zone in the conditions of the Filanovsky field edge area (North Caspian Offshore). The development target is the Lower Cretaceous sediments (Neocomian superstage), represented by interlayering of sandy reservoirs and clay-siltstones, changing their thickness and properties both in the northeastern and southwestern directions. The oilfield is characterized also by presence of fault zones (with amplitudes from 1 to 65 m). In addition to these geological and structural uncertainties during horizontal wells drilling on the edge parts of the structure (fold wings), significant structural angles cause additional complexity. One more important condition for the successful well landing is the fluid contacts crossing in definite parts of the section. Ultra-Deep Electromagnetic Logging While Drilling Mapping Technology was used to solve successfully all uncertainties and tasks.
-
-
-
Evaluation of Multilateral Wells Efficiency in the Fields of Vankorsky Cluster in Different Geological Environments
By A.A. ZerninSummaryThe purpose of the work is to assess the efficiency of difficult wells having different geometries (sidetrack/multilateral wells) under similar subsurface conditions. The work includes the following: formation of principles for selecting analogues to evaluate efficiency; selecting well sections in reservoirs of continental and marine genesis, comparing porosity and permeability; comparing productivity factors of producing horizontal section at the start of operation; evaluating the oil production decline rate and growth in cumulative oil production; and presentation of promising trends of multilateral well technology development. In order to evaluate the multilateral well efficiency as compared to the other types of completion, principles of site selection are developed based on close position of wells and similar porosity and permeability, energy condition of reservoir and development settings. The following stages were included in evaluation of site efficiency: 1) selection of sites for comparison in accordance with similar porosity and permeability; 2) comparison of well completion technologies and energy conditions of reservoir in the area of sites; 3) estimation of productivity factor and oil rates at the start of well operation; 4) analysis of oil production decline rate and cumulative oil production. In accordance with well commissioning data, the trend of productivity factor growth from the producing horizontal section is observed for horizontal holes; at the same time, based upon the trend lines, there is a limit of productivity factor growth because of draining the same volume of reserves. For the areas with representative operational statistics, the sites were broken down in accordance with continental (2 sites) and marine (4 sites) genesis; 5 more sites in the Vankorsky field were assigned to a separate block because of the lower energy conditions in multilateral wells compared to sidetracks (reservoir pressure by 15% lower on average). As a result of the assessment, efficiency of multilateral wells with respect to sidetracks was proved; the average increment of cumulative oil production per well for 6 months amounted to 5 thousand tons compared to sidetracks (+14%), while the predicted effect for 20 years makes 63.2 thousand tons (+75%). The best results in multilateral wells are obtained in reservoirs of continental genesis having better reservoir quality.
-
-
-
Combination of strat-based modeling & distance to boundary (inversion) methods implementation in geologically complex formation K1ne-2 of Balgimbaev oil field, Kazakhstan
SummaryYear by year drilling of horizontal wells becomes more and more popular way of the field exploration. For instance, at the beginning of XXI century the quantity of drilled horizontal wells from the whole amount was just about few percentages, if to say that nowadays this number is getting closer to 60%. Despite on that fact, that designing and exploration of oil & gas fields are such laborious processes, the main problem is still lies on the low level of EOR. Nowadays geosteering becomes an essential part of well drilling and increases the level of well targeting, therefore it enhances the level of extracted hydrocarbon fluid. Analyzing drilling datas, received in a real time from the wellbore, geosteering provides an opportunity to correct the planned trajectory of the well instantly and therefore make sure that the well stays in a target zone.
-
-
-
Marker-Based Long-Term Production Profiling Surveillance in Horizontal Wells in The Northern Capsian Sea
Authors E.A. Malyavko, S.Y. Shtun, A.A. Senkov, O.I. Abramenko, А.V. Buyanov, D.А. Lysova and E.V. PotapovaSummaryFundamentally new control tools for reservoir management are required in modern field tests for productivity estimation with high efficiency. One such tool is marker-based production logging enabling long-term production profiling surveillance. This research represents the case study of multi-phase flow profile estimation (oil, water and gas) in horizontal offshore oil wells in the North Caspian Sea. This method assumes that marker systems (marker cassettes) with unique codes are placed in the well as part of the lower completion. During further monitoring immediately after the well is put into production, formation fluid sampling is performed with a certain frequency according to a pre-formed schedule. The fluid and gas samples are analysed in the laboratory using specialised equipment. Based on the processing results, the distribution of each marker code was obtained. It shows the intensity of fluid flow from the formation into the wellbore. The results of production logging for each interval made it possible to determine the zones with low productivity, to identify how they correlate with the geological features of the area and the porosity and permeability distribution throughout the reservoir, and also to reveal the dependence of the production profile on well operation parameters. This information allows optimising the well operation and selecting the most promising development scenario to maximise hydrocarbon recovery.
-
-
-
Separate Production Metering From Each Formation When Integrating Taml-1 Well Construction Technology with Quantum Plt at The Novoportovskoye Field
SummaryThere are the remaining undeveloped hydrocarbon reserves at Novoportovskoye field occurring immediately under massive gas caps. To make field development economical in such geological settings, new technologies are required. This article describes the experience of constructing a multilateral well according to the new TAML Level 1 completion scheme, utilizing rock characteristics of the impermeable roof of the underlying bed and the dynamic Quantum PLT to arrange for separate production metering from each formation. Multilateral wells have been extensively drilled in the Novoportovskoye field in order to expand the drainage area. The dynamic production logging technology based on the use of quantum dot marker-reporters was chosen to arrange for separate production metering. The CAPEX and construction period have decreased by about 38%. The design enables separate production metering from each reservoir without stopping production. In addition, the costs associated with the regular interpretation of data obtained by analyzing the samples containing quantum-dot markers are offset by a reduction in operating costs for the pumping unit and service of well workover teams. The operator company has resolved to replicate the technology. However, the potential for this scale-up is limited by the requirements for the geological structure of the section.
-
-
-
Seeing fractures under a Microscope - the first application of the new microimager while drilling in WBM in Russia
Authors S.A. Nazarov, V.V. Slyusarev and A.F. IslamovSummaryNDP «Chepakovskoe» uses advanced logging while drilling technologies for studying the fracturing of Paleogene reservoirs of Chepakovskoye oil field (Stavrovol region). High-resolution microimager while drilling in horizontal well provide new information of complex structure of the Paleogene deposits which cannot be unambiguously characterized by standard logging methods. For example, wide development of natural fracturing according to core data cannot be taken into account according to the standard logging complex. At the same time, the data of high-resolution images made it possible to significantly detail the structural elements of the reservoir, to characterize the natural and drilling-induced fracturing of the rock. Main attention in this article is given to the analysis of fracturing of reservoir horizons, estimating of fracture density (frequency) along the wellbore and the determination of fracture aperture.
-
-
-
Verification of the polygonal approximation of an induction source in electromagnetic logging of horizontal wells
Authors P.A. Domnikov, Y.I. Koshkina and M.V. IvanovSummaryIn this paper, we study the magnetic field sensitivity from the sources of various configurations and check the adequacy of replacing the circular loop with a square vertical frame. The performed computational experiments showed that for the approximation of a current loop, the plane of which is perpendicular to the boundaries of layers with different resistivities, the choice of a vertical frame of four sides is sufficient in terms of the accuracy of the obtained components of the magnetic field in the receiver. The result is retained when the electromagnetic field frequency and the resistivity of the medium vary for situations typical for induction logging problems in horizontal wells.
-
-
-
Losses risk minimization while predrill stage and realtime drilling geomechanics support on the north part of Caspian sea
Authors M.U. Topolyan, G.A. Chikhanov, P.S. Bak, A.S. Kuznetsov, R.V. Golubtsov and V.R. KuzakovSummaryOil field development in the northern Caspian Sea involves the drilling of horizontal wells in terrigenous Lower Cretaceous sediments with low hydraulic fracture pressure, where both geological and technical conditions increase the risk of fluid loss. The main geological factors that cause losses on the Filanovsky and Korchagin fields are wells with direction to maximum horizontal stress azimuth, fractures and faults, and depletion of producing formations. Technical reasons include high mud density, use of standard (without increased diameter) casing, poor borehole cleaning, which leads to unacceptable growth of equivalent circulating mud density during drilling. Separately, the high probability of losses during the cementing phase of the well is considered. One of the proactive tools for managing drilling fluid loss risk is building a geomechanical model that includes calculation of losses and hydraulic fracturing gradients, which allows determining safe limits of equivalent circulating density during drilling and performing trajectory optimization at the initial planning stage to expand the safe drilling fluid density window.
-