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3rd EAGE/SPE Geosteering Workshop
- Conference date: November 2-4, 2021
- Location: Online
- Published: 02 November 2021
21 - 30 of 30 results
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A multi-physic methodology for 3D structural delineation and geosteering in real-time using cloud computing
Authors M. Bower, D. Salim, M. Etchebes and V. WibowoSummaryReservoir Mapping While Drilling has helped improve the geosteering and reservoir mapping services for over a decade and bridges the gap between borehole and seismic scale data. This example illustrates how, by utilising cloud computing power and combining the analysis of seismic data with borehole derived full 3D electromagnetic LWD measurements, leads to an improved structural delineation and geosteering results in 3D space, all during real-time drilling operations.
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P03: Jurassic gas. Geosteering with reservoir mapping technology in Jurassic deposits of Zapadno-Yurkharovskoe field in Russia
Authors V. Sayfitdinova, R. Khabibullin, E. Skorikova, T. Berdnikova and A. ShakunovSummaryThe country’s powerful mineral resource base is a guarantee of its security and successful development. A significant share of Russian mineral resource base are hydrocarbons: oil and natural gas, the production of which should be maintained at the achieved level in the long term. Over time, this task becomes more and more difficult to fulfill due to the depletion of proven reserves. Thus, oil and gas industry is increasingly interested in the not previously developed «border-economic» hydrocarbon reserves, which is also facilitated by tax incentives, a well-developed infrastructure of old production complexes and, of course, the latest technologies for productive formations characterization. This article describes the experience of geosteering using the technology of remote boundary detection while drilling to solve the versatile problems of developing hard-to-recover reserves of the Middle Jurassic oil and gas complex of Zapadno-Yurkharovskoe field.
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Using a real-time 3D-reservoir-mapping tool to image a complex deep-water reservoir in a producing oil field
More LessSummaryThe Laverda Field is a deep-water slope canyon on the North-West margin of Australia operated by Woodside Energy Ltd. with Mitsui E&P Australia Pty Ltd as a Joint Venture Participant. Development drilling in 2018–2019 comprised five long producer and injector wells that were geo-steered in thin high quality oil bearing reservoirs. The field successfully came on stream in July 2019 but a re-drill of one production well, located 30 metres downdip and parallel to the original well, was required in June 2020. The re-drill offered the chance to use new real-time 3D reservoir mapping tool technology. This new technology significantly improved the imaging of the reservoir in both a vertical sense and up to 30 metres laterally either side of the wellbore including the original well. Its greater depth of investigation and higher resolution enabled an optimised well path and a successful completion programme in a geologically complex reservoir.
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Similar geology, same stochastic inversion, different azimuthal resistivity tools - lessons learned from well placement experience
Authors D. Nemuschenko, P. Shpakov, P. Bybin, K. Ronzhin and M. SviridovSummaryNowadays proactive geosteering has become almost mandatory for drilling horizontal wells, because using this method you can predict boundaries position and avoid exit from desired zone. One of the best method of proactive geosteering is deep-azimuthal resistivity and inversion as method to analyze it. This article includes the results of applying the developed stochastic inversion to Novatek data from ADR (Halliburton) and AziTrak (Baker Hughes) tools in similar geological conditions of the terrigenous formation of West Siberia.
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Azimuthal geosteering technique
Authors T. Popov, D. Leontyev, I. Evdokimova, Y. Selivanov and V. KimSummaryToday geosteering mostly focused at 2D models along planned borehole azimuth. This approach allows to adjust trajectory by changing the inclination based on comparing synthetic and real-time logs and interpretation of images and boundary detection tools. However, there are cases which required drilling at single TVDSS, but there are remained structural uncertainties. Consequently, it is required to perform geosteering to keep the wellbore inside the target formation, for example while drilling the laterals in oil rims at the edge of structures with steep formation dips. In such cases trajectory azimuth adjustments needed for changing stratigraphical position of the borehole. Conventional geosteering approach doesn’t provide accurate decisions assessment and new techniques are required. Abstract describes an approach of azimuthal trajectory adjustments for well placement. Different methods of azimuthal steering reviewed in this paper in dependence on formation strike and dip. Provided calculations could be utilized for quick decision-making process while geosteering. Additional data of LWD images and boundaries detection tools evaluated in respect to azimuth adjustment technique and efficiency of its applications.
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New multiscale measurement approach for geosteering in low resistivity and low contrast reservoirs: Cygnus field
Authors M. Dupouy, K. Simpkin, M. Covill and M. BowerSummaryDecember 2016, with 60% of the reserves being found in the Leman Formation. The Leman was initially developed in the best reservoir quality fault blocks via horizontal wells drilled with Periscope HD and borehole images. As the development progressed, poorer reservoir quality intervals were targeted. The 2012 FDP envisaged completion via fracture stimulation with associated risks and costs.
To address challenges in the latest Cygnus reservoir section, the worldwide first combination of measurements from the Geosphere HD and Periscope HD was utilised; combining two scales of depth of investigation and resolution. The results allowed for accurate placing within the thinly bedded and low contrast reservoir intervals, while being able to understand the well’s true stratigraphic position and the character of the Carboniferous subcrop in real time. The multiscale measurements helped Neptune to optimize the well path position and delivered greater confidence in decision-making whilst drilling.
Once the well was completed, it tested at higher rates than would have been expected and avoided a fracture stimulation. This tool combination has opened new development targets within other low reservoir quality areas on Cygnus.
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Integrating time-indexed archives of past drilling data improves the reliability of geosteering and monitoring activities
More LessSummaryGeosteering is predicated on the concurrent observation of data transmitted from the drilling operation characterizing the rocks and fluids encountered at or close to the drilling bit, and existing models and predictions used to plan the well. In an ideal world they should match, indicating that the models and predictions were correct and that the drilling is located at exactly the right 3-dimensional location relative to the surrounding formations and the area of interest within the formation. Of equal importance is the use of measurements from prior drilling activities geographically close or having penetrated formations similar to the current well. Their availability can provide insights into current events. The use of a time-indexed repository that contains the records of the data coming from prior real-time data transmissions allows for a direct comparison and assessment of live data channels compared to historical ones. This facilitates the application of analytics and the training of machine-learning systems.
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Mapping Reservoir in Complex Fluvial Channel Sand with 3D Mapping Reservoir Mapping While Drilling
SummaryThe novel ultra-deep 3D bed boundary mapping technology was first ever implemented in case study well with the objective to map the various sand bodies in 3D while cutting down structure through the entire Wara section. The following paper discusses the key aspect of this technology and the results that followed.
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Accurate reservoir description and well placement using distance data, zone logs and depth to fluid contact
Authors P. Dahle, A. Almendral Vazquez and A. SektnanSummaryWe show how distance data derived from inversion of logging-while-drilling directional resistivity (DDR) measurements can be used to constrain both the surfaces confining the reservoir and the well being drilled.
For geosteering, it is important to know where the well is relative to the reservoir surfaces and contacts while their absolute positions in space is irrelevant. DDR measurements provide the perfect data for this. We have used a Bayesian kriging framework to include DDR data directly in predictions of surfaces and wells. Taking into account uncertainties in distance data, surface depth, and the TVD position of the well, this method can be used to continuously update the position of reservoir surfaces and well while drilling,
For a real reservoir, we demonstrate how the prediction uncertainty can be reduced by adding different kinds of well data to the prediction, and how the prediction uncertainty increases when the well path TVD uncertainty is accounted for. We also show how the free water level can be taken into account in the surface prediction.
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Finding the needle in a haystack: Multi-solution integration for multiple challenges, a case study from UAE
Authors J. Maalouf, S.M. Lyonga, S. Suleiman, W. Siddiqui, C. Shrivastava, M. Ashraf, H. Khemissa and Y. GorayaSummaryIn this case study, a Maximum Reservoir Contact (MRC) had multiple objectives to achieve in a 3ft thick limestone layer.
First it needed to detect the high risk water zones.
Second, the areas with high Gas Oil Ratio (GOR) needed to be identified and avoided
Third, that thin layer needed to fall within a certain permeability range.
Fourth, the geology is uncertain with fast changing dip and faults.
Several technologies were combined including a first in the UAE, the ElectroMagnetic (EM) images in Oil Based
Mud OBM, to resolve for all these challenges and deliver a successful 13000ft long horizontal.
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