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Africa (Sub-Sahara) A discovery was made at the Ogo-1 well offshore Nigeria. The well reached a total depth of 3206 m and encountered a gross hydrocarbon section of 524 ft with 216 ft of net stacked pay. Optimum Petroleum Development (60%) is the operator in partnership with Afren (22.86%) and Lekoil (17.14%). Asia Pacific Production has begun on the offshore Wenchang 8-3E oil field in China. The field is located in the western Pearl River Mouth basin in China and has an average water depth of approximately 110 m to 120 m. China National Offshore Oil Corporation is the operator with a 100% interest. The Tayum-1 exploration well encountered approximately 49 vertical ft of net gas pay from multiple sandstone intervals within the Miocene and Pliocene section.
Africa (Sub-Sahara) FAR said that drilling has begun on the SNE-5 appraisal well offshore Senegal. The well and the following SNE-6 well will evaluate the upper SNE reservoir units' connectivity and deliverability by oil flow testing that will include interference tests. The new wells follow a four-well appraisal program that the company called "highly successful." FAR has a 15% interest in the SNE field, which is operated by Cairn Energy (40%). Other participants are ConocoPhillips (35%) and Petrosen (10%). San Leon Energy reported encouraging performance from its OML 18 field in Nigeria. Reperforation of an oil well increased gross field production to approximately 61,000 B/D before output was temporarily scaled back to 53,000 B/D for a shut-in, upgrade, and workover of the well.
Africa (Sub-Sahara) San Leon Energy reported encouraging performance from its OML 18 field in Nigeria. Reperforation of an oil well increased gross field production to approximately 61,000 B/D before output was temporarily scaled back to 53,000 B/D for a shut-in, upgrade, and workover of the well. A number of other field wells will be reperforated in coming months, the company said. San Leon holds a 9.72% interest in the field, which is operated by Eroton (35%). Nigerian National Petroleum Corp. holds the remaining stake. FAR said that drilling has begun on the SNE-5 appraisal well offshore Senegal. The well and the following SNE-6 well will evaluate the upper SNE reservoir units' connectivity and deliverability by oil flow testing that will include interference tests.
The PDF file of this paper is in Russian.
In 2019, RN-Shelf-Arctic LLC, a subsidiary of Rosneft Oil Company, carried out a regional project on Cretaceous deposits (structural and depositional environment reconstruction) in the Russian territory of the Barents Sea in order to explore new potential objects and increase the resource base at Rosneft. The algorithm of the studies included the interpretation of seismic data, the analysis of well data and outcrops of the islands within the Barents Sea, the identification of typical seismic facies and their depositional interpretation, the choice of palaeoenvironmental reconstruction intervals, the analysis of thickness and seismic facies maps and finally, facies-palaeogeographic reconstructions. Sequence stratigraphy was used as the main interpretation method. Thus sequence boundaries and maximum flooding surfaces were justified and correlated as a chronostratigraphic framework. As a result, seven sequences were identified in the Lower Cretaceous interval: five sequences in the Neocomian interval (approximately the third order) and 2 sequences in the Aptian-Albian interval (2 orders). Mapping was carried out at two levels: combined LST + TST and HST. One of the most interesting results of the study is the recognition and mapping of stepped-dipping steeply falling clinoform bodies associated with forced regression in three Neocomian sequences. These bodies were interpreted as deposits of deltas of shelf edges. According to the literature data, deposits of a similar genesis are characterized by a high content of sand material and have good reservoir properties. The results of this study can significantly reduce the risks associated with the reservoir properties for the objects within the zone of distribution of these deposits.
В 2019 г. в рамках регионального проекта дочернего общества компании ПАО «НК «Роснефть» ООО «РН-Шельф-Арктика» выполнялись работы по изучению геологического строения, условий формирования и фациальной диагностики меловых отложений российского сектора Баренцева моря с целью поиска в них новых перспективных объектов и наращивания ресурсной базы компании ПАО «НК «Роснефть». В статье рассмотрены результаты исследований, которые включали интерпретацию сейсмических данных, анализ материалов изучения разрезов скважин и обнажений островного обрамления Баренцева моря, выделение типовых сейсмофаций и их фациальную интерпретацию, выбор интервалов построения карт, анализ карт толщин и карт сейсмофаций и собственно, фациально-палеогеографические реконструкции. В качестве основного интерпретационного метода использовалась секвенсная стратиграфия, в качестве хроностратиграфического каркаса обосновывались и коррелировались границы секвенций и поверхности максимального затопления. В результате в изучаемом нижнемеловом интервале разреза выделены семь секвенций: пять из них (третьего порядка) в неокомской и две (второго порядка) в апт-альбской частях разреза. Картопостроение выполнялось по двум уровням: объединенному (нижний (LST) и трансгрессивный (TST) системные тракты) и верхнему (HST). Одним из наиболее интересных результатов работы является выделение в течение формирования нижних системных трактов трех секвенций эпизодов форсированной регрессии и связанных с ними ступенчато-погружающихся крутопадающих клиноформных тел. Эти тела по ряду ярких признаков интерпретированы как отложения дельт бровок шельфа. Отложения подобного генезиса отличаются высоким содержанием песчаного материала и представляют собой толщи-коллекторы с улучшенными фильтрационно-емкостными свойствами. Результаты исследования позволяют существенно снизить риски, связанные с выявлением коллекторов на объектах, расположенных в зонах распространения рассмотренных отложений.
Overcoming environmental challenges to develop offshore oil fields remains daunting for engineers who must balance economic feasibility with environmental protection, often within limited timelines before first oil commitments. A critical examination of Saudi Arabia's field development cases reveals a 56-year timeline (which seems interminable) between offshore field discovery in 1957 and realization of an environmentally friendly field development in 2013. If teams desire to accomplish Aegian projects with the sustenance of core values in perspective (whatever the core values might be), such as to gain the economic advantages of offshore projects while preserving the environment or honoring some other constraint, it is imperative to work with more robust timelines. Whereas strictly time-bounding projects may help with releasing adrenalin for performance, engineers may require adequate time for innovative concept designs to conduct necessary pilots and qualification.
Collaboration between cross-functional project teams – construction, drilling, testing, and production – is examined from the economic delivery of several challenging wells under various environmental challenges and constraints. An overarching theme from each team was to apply environmental solutions. Colonization of hard coral species and presence of several fish species were observed on project completion. For example, a 70% increase in growth of Seagrass and artificial coral reefs was observed near the causeway built for the Manifa Field, which could become a hot spot of biodiversity. Water circulation, as measured by an acoustic doppler current profiler (ADCP) improved from 17 days before the project to 11 days on project completion. When engineers persevere, collaborate and have enough time to plan intensively until they find the technology solutions to advance, society benefits from an environmental return.
As the worldwide study cases reveal, several projects are threatened globally because engineers may be unable to find viable solutions under rigid timelines. Often companies must be willing to wait until they acquire the technologies to responsibly advance complex environmentally sensitive projects. If timelines are flexible and sufficiently realistic, management's unwavering support to avail necessary resources would be critical for success.
Efimov, Yaroslav Olegovich (Arctic Research Centre) | Kornishin, Konstantin Alexandrovich (Rosneft Oil Company) | Buzin, Igor Vladimirovich (Arctic and Antarctic Research Institute) | Gudoshnikov, Yuri Petrovich (Arctic and Antarctic Research Institute) | Nesterov, Alexandre Valerievich (Arctic and Antarctic Research Institute) | May, Ruslan Igorevich (Arctic and Antarctic Research Institute) | Sochnev, Oleg Yakovlevich (Rosneft Oil Company) | Tarasov, Petr Alexandrovich (Rosneft Oil Company)
This paper presents field results and analysis of iceberg towing experiments performed in the Barents and Kara Sea in 2016-2017. For the first time ever in the industry, this research was based on a complex study of the icebergs origin and properties. For that purpose prior to the trials outlet glaciers of Novaya Zemlya, Franz Josef Land and Severnaya Zemlya were examined with airborne radar that allowed to measure their thickness and to build 3D models. Satellite remote sensing data were used to derive glacier fronts position, ice surface flow velocity, changes of glacier margins, and parameters of iceberg distribution. The data on the flow rates of the main glaciers were compared with the satellite beacons equipped with GPS (ARGOS) installed on several glaciers. Empirical relationships were derived to determine the mass and geometry of icebergs based on instrumental measurements and airborne data in the Barents and Kara seas. All this information was used to estimate iceberg towing possibilities in different conditions, analyze obtained data and deeper understand the process. Influence of oscillations during the towing process was studied. For a wide range of towing speeds, drag force coefficients were determined for icebergs of various sizes and shapes. Experimental iceberg towing operations performed in ice fields during the early stages of ice formation are described. These works were conducted in October 2017 in the Kara sea. Limitations of iceberg towing under different ice conditions are determined and discussed. Technological features of towing operations within negative air temperatures and the presence of sea ice are also highlighted.
Kornishin, Konstantin A. (Rosneft Oil Company) | Efimov, Yaroslav O. (Arctic Research Centre) | Gudoshnikov, Yury P. (Arctic and Antarctic Research Institute (AARI)) | Tarasov, Petr A. (Rosneft Oil Company) | Chernov, Alexey V. (Arctic and Antarctic Research Institute (AARI)) | Svistunov, Ivan A. (Arctic and Antarctic Research Institute (AARI)) | Maksimova, Polina V. (Arctic and Antarctic Research Institute (AARI)) | Buzin, Igor V. (Arctic and Antarctic Research Institute (AARI)) | Nesterov, Alexander V. (Arctic and Antarctic Research Institute (AARI))
This paper presents field results and analysis of iceberg towing experiments performed in the Barents and Kara seas in 2016–2017. Influence of oscillations during the towing process is demonstrated. For a wide range of towing speeds, drag force coefficients are determined for icebergs of various sizes and shapes. Simplified formulas for the iceberg towing force are proposed for the stationary mode. Formulas of long-period oscillations are also derived. The possibility of iceberg destruction by the vessel’s circulation in warm water and long-distance iceberg towing is demonstrated.
The possibility of changing an iceberg’s drift trajectory in order to prevent its collision with offshore oil and gas facilities is an important factor for ensuring safe and economic developments in polar offshore regions. This approach is well known and has been used for several decades by oil companies operating offshore Newfoundland and Labrador (Randell et al., 2009). Timely detection (Pavlov et al., 2018) and towing of such giant and unsymmetrical objects as icebergs is associated with a number of specific features. Correct determination requires field tests and proper data analysis.
In order to test the technology of iceberg security under conditions of the Russian Arctic, the Rosneft Oil Company (Moscow, Russia) together with the Arctic and Antarctic Research Institute (AARI, St. Petersburg, Russia) and the Arctic Research Center (Moscow, Russia), performed field iceberg experiments with various technical means in the autumn periods of 2016–2017.
There is plenty to be optimistic about in the upstream oil and gas oil sector. In this article, the Energy Industries Council (EIC) focuses on offshore opportunities globally, and identifies the hot spots of activity. It will also examine some of the key issues facing the sector and the energy supply chain today, such as the need to maximize oil and gas recovery from challenging environments and new offshore fields, and the need to reduce costs and innovate. The EIC's project tracking database, EICDataStream, which tracks more than 9,000 active and future projects across the global energy industry, currently shows 1,075 offshore projects that are active or proposed. Together, these represent a total potential investment value of USD 1.27 trillion.
This study examines which is the margin of usability for Artificial Intelligence (AI) algorithms related to the rock properties distribution in static modeling. This novel method shows a forward modeling approach using neural networks and genetic algorithms to optimize correlation patterns among seismic traces of stack volumes and well rock properties. Once a set of nonlinear functions is optimized in the well locations, to correlate seismic traces and rock properties, spatial response is estimated using the seismic volume. This seismic characterization process is directly dependent on the error minimization during the structural seismic interpretation process, as well as, honoring the structural complexity while modeling. Previous points are key elements to obtain an adequate correlation between well data and seismic traces. The joint mechanism of neural networks and genetic algorithms globally optimize the nonlinear functions and its parameters to minimize the cost function. Estimated objective function correlates well rock properties with seismic stack data. This mechanism is applied to real data, within a high structural complexity and several wells. As an output, calibrated petrophysical time volumes in the interval of interest are obtained. Properties are used initially to generate a geological facies model. Subsequently, facies and seismic properties are used for the three-dimensional distribution of petrophysical properties such as: rock type, porosity, clay volume and permeability. Therefore, artificial intelligence algorithms can be widely exploited for uncertainty reduction within the rock property spatial estimation.
In this paper we describe experimental investigations of ice blocks collisions. Ice blocks of pyramidal and cubical shapes sawn from natural sea ice were used in the in-situ experiments. The accelerations of ice blocks colliding in the air and water environments were recorded by the accelerometer with 1.6 kHz sampling frequency and video. Mathematical models describing the interaction of ice blocks in water environment are formulated and the experimental results are reproduced by numerical simulations. Significant reduction of ice blocks accelerations and ice loads are identified in the experiments on ice blocks collisions in water environment.
Melting of sea ice in the Arctic is anticipated to result in an increase in navigational activity in this region. Correspondingly, the risk of collisions between non ice-class vessels with floating ice may also increase. Such collisions can potentially result in significant damage to ship hulls. Therefore, experienced captains will usually reduce the vessel speed to a minimal value of about 2 knots when they operate in ice covered waters to avoid high speed collisions with floating ice. The presence of water may have a dissipative effect and reduce the contact loads during vessel collisions with floating ice blocks of relatively small sizes, as compared with ice loads during vessel impacts on larger floes. Such damping occurs due to momentum transfer to the water between the ice and vessel hull (Fig. 1a). Similar processes have been studied by Gagnon (2004), and Gagnon and Wang (2012), who performed numerical simulations using the software LS-Dyna to model collisions between a tanker with a bulbous bow (1,700,000 t displacement) and bergy bits with mass of 13000 t.
The presence of water between the ice floes may also influence the damping of surface waves due to the production of water jets between floes as they collide. Figure 1b shows water jets caused by floes interacting under compression during the propagation of swells below drift ice in the Barents Sea in April 2006 (Marchenko et al, 2015).