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EAGE GeoTech 2021 First EAGE Workshop on Directional Drilling and Geosteering
- Conference date: March 1-5, 2021
- Location: Online
- Published: 01 March 2021
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Assisted Geosteering Through Advanced Computed Algorithms
Authors D. Marbebe, A. Sabirov, W. Davila, K. Ronzhin and V.K. PayrazyanSummaryGeosteering improves the success rate by placing the borehole in the optimum position within the reservoir. It relies on the timely access to accurate decision-making information related to wellbore trajectory. With advent of unconventional resources and widespread horizontal well drilling, geosteering technologies and methods have developed substantially. The changes were mainly driven by industry challenges such as cost-cutting initiatives, performance improvement, narrower target zones and longer lateral lengths. Over the last few years, there has been a general trend to simplify bottomhole assembly (BHA) and specifically MWD/LWD tool strings. Concurrently, many operators are enforcing more rigorous requirements for the drilling target window and percentage drilled in the zone.
The purpose of this study is to evaluate the Assisted Geosteering (AG) technology and the upside it provides to Operations Geoscientist executing real-time in the complex and data-rich environment of well drilling operations.
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New Data Transfer Protocol Capabilities Automate Data Streaming Channel Setup and Reduce the Probability of Errors
More LessSummaryThe ETP standard was published in 2016 and offered much faster realtime connections from remote rigs to monitoring centers, reducing data transfer lags from 15 seconds to 1 second while using one tenth of the data communication bandwidth for a given channel. A new and expanded version introduces a simplification in the setup process of a data streaming channel or set of channels, using new messaging protocols and notification processes. This makes the connection of a server to a broader range of data producing systems more reliable and less prone to human errors while also requiring less supervision. It is also more scalable in response to the increasing number of producing channels that can be expected with the growing digitalization of drilling operations.
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Advanced Geosteering using Data Integration on XRF/XRD, Gas Analysis and LWD data to Optimize Well Placement
Authors J. Dashti, B. Al-Ajmi, H. Sabri, B. Al-Adsani, H. Farwan, A. Al-Shoeibi, M. Sanclemente, D. Krott and R. CuevasSummaryMiddle Marrat is a primary Jurassic tight carbonate reservoir with enhanced porosities granted by crystalline dolomites and homogeneous gamma/resistivity response, which means geosteering with traditional LWD methods in this formation is a challenge; a new approach is necessary in this case.
Detailed geochemical characterization using XRF/XRD analysis from cuttings, advanced gas analysis (C1-C8), and LWD logs are all integrated in real-time using StarSteer, a powerful software solution which allows visualizing, interpret and integrate all the geosteering techniques (Model-Based, Strat-Based, Multi-well and Multi-log) in one window simultaneously.
Using this method, it was possible to land, navigate, and reach well TD safely along 965 ft of horizontal section with 97% inside the objective, giving the client better information to make decisions in real-time and save costs avoiding incurring in additional delays.
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A multidisciplinary approach for precise well-placement and accurate wellbore positioning, utilizing third-party directional and LWD tools
More LessSummaryWith the rapid evolution and recent advancements of information technology, it has become possible to stream big data across the globe in real time. As a result, the creation of a multidisciplinary integrated fully remote real time operations centre has become a reality.
As we continue to experience challenging market conditions there is a constant push to make operations more efficient and cost-effective. The combination of intelligent technology and highly skilled expertise all under one roof is the key to combating these challenges using our smart solutions.
Our 24/7 technology-enabled real time vendor-independent operations centre receives; drilling data, lag data, directional drilling parameters, directional surveys and LWD measurements and geological data in real time and we process the information after passing it through a QC check list and analysing it for accurate well placement and well bore positioning. Our highly qualified experts have broad multidisciplinary knowledge and extensive experience in drilling, directional drilling, MWD/LWD, geosteering, geology and LWD Petrophysics.
Our next step towards optimization is the integration of artificial intelligence and human intelligence for advanced visualization, faster and more accurate decision making, and minimizing non-productive time.
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Geological monitoring for drilling a transport section well bore using inverse values of ROP
By I. MostovichSummaryAt the stage of geological monitoring for drilling the transport section of the well, the geosteering specialist uses LWD and Mudlogging data. Geophysical methods of gamma-ray, neutron gamma-ray, and laterolog are used for stratigraphic identification of the target formation. If the task is to stop the drilling of the transport section at a depth of half а meter from the top of the formation, then an at-bit sensor gamma-ray is required. However, this tool has a high cost and is not always used in the bottomhole assembly. So, if a constant drilling regime is observed and the angle of the bit meeting with the rock stratification plane is minimal, it is legitimate to use the value-inverted ROP (ROPIV) curve from the Mudlogging station to identify the stratigraphic reference point of the target carbonate formation.
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Mapping Water Encroachment in Low Deviated Well in Real-Time, A Solution from LWD EM-Look Ahead Technology
Authors I. Pasaribu, N.F. Al-Khalifa, M.F. Hassan, D. Joshi and H. Al-AjmiSummaryThe Umm Gudair (UG) field is a carbonate reservoir of West Kuwait with more than 57 years of production history. The average water cut of the field reached to 60%. Due to long history of production and variable drawdown in the different part of the field, consequentially undulating current oil-water contact (COWC). In result, uncertainty of COWC in development wells drilling locations. UG field required a technology, which can give proactive approach while drilling to get ahead indication of approaching current oil water contact and geo-stop drilling to give optimum stand-off between the bit and the detected water contact (COWC). This innovative approach optimizes well performance through production’s improvement and well cost optimization.
In this paper, it will discuss the innovative approach for detecting current oil-water contact with EM Look Ahead while drilling. The pre-job well study, designing the tool configuration, real time execution and the result will be discussed.
COWC was first time registered by 63ft TVD ahead of the bit position while drilling by the EM look-ahead resistivity. This detection gives real time decision to place the well in optimum space to the current oil water contact.
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From 2D extra-deep resistivity reserovoir mapping to 3D structural modelling. Conegliano UGS, Italy
More LessSummaryAzimuthal resistivity tools and extra-deep azimuthal resistivity, coupled with multicomponent inversion modelling of the resistivity profile, allow detecting multiple target boundaries away from the wellbore. The ability of resistivity tools to trace far boundaries, coupled with the results of resistivity inversion modelling, can also significantly enhance the understanding of the structural trends with high accuracy and resolution.
However, despite the ability of resistivity tools of mapping one or more formation boundaries along the wellbore, this detailed structural information is commonly neglected when reservoir navigation data are imported in the pre-well 3D structural models, which are based on seismic and well correlation data.
The case history presented shows how the structural trends, mapped by means of extra-deep azimuthal resistivity during the drilling of a horizontal well within a thick sand reservoir, can be integrated into the 3D geological model, increasing its resolution and providing an enhanced view of the structural trends.
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Geomodel Update while Geosteering ERD wells based on Deep Electromagnetic Reservoir Mapping Technology, Russia Far East
Authors T. Popov, I. Evdokimova, V. Kim, I. Kabirova, E. Bolychev and V. MaltsevSummaryThe paper describes case study and methodology of updating geological model with elements of paleo reconstruction based on data accrued from deep electromagnetic reservoir mapping while drilling technology utilized in ERD horizontal wells drilled in Russian Far East region, Sakhalin Island. Odoptu-more field is known as very challenging for its geology. Major challenges are structural, stratigraphic uncertainties and lithological heterogeneity of the reservoir. Additional problem for well planning and well placement is lack of good-quality seismic and gas effect on top of the zone of interest. Even many wells already been drilled on the field, still reservoir continuity, sands distribution, pressure regime are not clear, actual and forecasted production rates correlation not sufficient. Thanks to mapping technology few geological features were observed, as an example a big sand distribution channel with thickness up to ∼45 mTVD. Shape and property of the geological bodies detected has been utilized while updating geological model and helped to trace some features in other parts of the target bed. In addition, a new knowledge allows to confirm seismic interpretation for some zones of the field and sufficiently change vision of reservoir production for few wells.
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Automatization and optimization of geosteering processes at Rosneft company
Authors M. Lisitsyna, T. Rakhimov and A. MikhoparkinSummaryThe presence of a huge database of drilled wells allows using the accumulated experience in order to improve the efficiency of geosteering in the future.A number of processes have been automatizated thanks to certain algorithms for simple tasks, as well as the accumulated experience for more complex ones (based on machine learning). Automatization of processes has led to a significant reduction of time spent by an employee to perform trivial tasks, increasing the speed of decision-making and, as a result, increasing in the efficiency of geosteering. The main achievement is a reduction in the unproductive time of drilling crews waiting for a decision by geologists, which in turn reduced the risks of collapse of the borehole walls, stuck drilling, mud absorption, and other problems arising during well drilling.
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A business system that allows to geosteer 3,000 horizontal wells per year
Authors V. Filimonov, K. Kudashov and V. AntsupovSummaryThe report will show how the Company works, which allows drilling more than 3,000 horizontal wells per year with limited resources.
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Integrated approach for the U-type horizontal well drilling & geosteering in shallow Turonian sands
Authors A. Valiakhmetov, V. Kramar, R. Khabibullin, I. Shmarin, V. Vorobev, I. Dubnitsky, V. Konyshev, A. Cheprasov and M. IlkamSummaryProduction drilling in Turonian sands was started in 2018 in Yamal region, Russia. The novelty was the U-type trajectory up to 114 degrees inclination, placed ultra-shallow, at 700m true vertical depth in complex geology formation considering technical limits.
High dogleg severity (DLS) required to drill 8 11\16in section to target depth, was the main challenge of drilling engineering proposal. The bottom hole assembly with rotary steerable system was specially modelled to achieve necessary DLS in soft unconsolidated sands. There were no wells in region at all, drilled within the same conditions. Another risk was casing stuck due to sinusoidal buckling and microDLS caused by excessive trajectory corrections.
High uncertainty of Turonian top position, variable reservoir thickness, local structural dip variance led to added geosteering complexity.
The planned trajectory design was divided to fixed clusters with defined sequence and type. The parameters of each cluster were set by drilling and well placement engineers on planning stage, based on technical limitations and geological uncertainties. Further the cluster parameters were adjusted while drilling, based on geology. Each cluster had predefined drilling\geology scenarios to achieve maximum net to gross ratio.
This approach allows to make rapid decisions and reduce technical risks while geosteering
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Identifying the value of an advanced surveying technique to aid the decision making process while geosteering
Authors R. Rakhmangulov, D. Levitskiy, D. Leontyev and V. GredzhevSummaryThis paper will discuss an application of high frequency inclination surveys which can be used for geosteering purpose at two most critical stages of the process: landing a well on the top of a pay zone and drilling the lateral inside the reservoir.
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Improving structural prediction while geosteering through resistivity to acoustic impedance conversion using field data
Authors G. Alberelli, C. Tarchiani, A. Leone, M. Nickel and D. SteckhanSummaryIntegrating Ultra-deep directional electromagnetic (EM) measurements with surface seismic to improve the look ahead predicting capabilities. Among the workflows created to enhance the resistivity to seismic mapping, a new methodology has been developed based on regression functions. The focus of this work is the Regression Functions methodology, that was implemented to determine an empirical Resistivity to Acoustic Impedance relationship based on the available field data coming from offset well logs.
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Evaluation and Application of ElectroMagnetic Look-Ahead Technology
Authors F. Chinellato and M. MeleSummaryReviewing the applicability evaluation of ElectroMagnetic LWD and presenting a real application
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