|Theme||Visible||Selectable||Appearance||Zoom Range (now: 0)|
Gabaldon, Oscar (Blade Energy Partners, Ltd.) | Gonzalez Luis, Romar (Blade Energy Partners, Ltd.) | Brand, Patrick (Blade Energy Partners, Ltd.) | Saber, Sherif (Blade Energy Partners, Ltd.) | Kozlov, Anton (Blade Energy Partners, Ltd.) | Bacon, William (Blade Energy Partners, Ltd.)
In high pressure high temperature (HPHT) reservoirs and exploratory wells, especially in deep water, there is a higher degree of uncertainty, which can increase the operational costs due to non-productive time (NPT) and operational problems due to the unpredictable nature of these wells. For these challenging wells with narrow windows, Managed Pressure Drilling (MPD) techniques offer cost-effective tools to increase the odds for achieving well and cost objectives assurance. There are significant benefits from early implementation of MPD in the project life cycle. These benefits include from improving operational efficiency to risk mitigation and safety enhancement. However, there is an enormous potential that many operators have been missing. This is related to the incorporation of MPD as a driver in optimizing the well design, which could greatly increase the possibilities of reaching target depth, and potentially prepare to eliminate one or more casing strings. Current well design process hinges on the ability to manage uncertainties by company or regulatory requirements, such as kick tolerance and safety factors. This work addresses the value added from implementing MPD in early stages in the project life cycle through the analysis of case studies. The cost savings from the impact on the well design are also discussed. This work also presents a in depth discussion on the benefits, and enablers of this approach. Furthermore, it presents considerations by taking advantage of dynamic processes facilitated with MPD. Finally, new guiding criteria to aim to constitute a systematic and integrated approach to ensure well integrity and optimize well design while also considering the operational implications and integral cost benefits is proposed to the industry. This paper represents the initial phase of a compressive long-term project to integrate two main components of well design. These are MPD adaptive well design, and statistical analysis based on variations of load and/or strength.
Godhavn, John-Morten (Equinor) | Olorunju, Banzi (Equinor) | Gorski, Dmitri (Heavelock Solutions) | Kvernland, Martin (Heavelock Solutions) | Sant'Ana, Mateus (Heavelock Solutions) | Aamo, Ole Morten (Norwegian University of Science and Technology NTNU) | Sangesland, Sigbjørn (Norwegian University of Science and Technology NTNU)
This paper describes measured and simulated downhole pressure variations ("surge and swab") during drill pipe connections when drilling an ultra-deepwater well offshore Brazil on the Carcará field. Floating rig motion caused by waves and swell ("rig heave") induces surge and swab when the drill string is suspended in slips to make up or break a drill pipe connection and topside heave compensation is temporarily deactivated. This is a known issue in regions with harsh weather such as the North Sea, where pressure oscillations of up to 20 bar have been reported during connections. Recorded downhole drilling data from the Carcará field reveals significant pressure oscillations downhole (in the same order of magnitude as in the North Sea) each time the drill string was suspended in slips to make a connection in the sub-salt 8 ½" section of the well. Mud losses were experienced around the same well depth and they might have been caused by surge and swab.
Measured surge and swab pressure variations have been reproduced in an advanced proprietary surge and swab simulator that considers rig heave, drill pipe elasticity, well friction, non-Newtonian drilling mud, well trajectory and geometry. Moreover, findings in this paper suggest that surge and swab was in fact significantly higher than recorded by the MWD (Measurement While Drilling) tool. The true magnitude of surge and swab is not captured in the recorded MWD data due to low sampling frequency of the downhole pressure recording (one measurement every six seconds, a standard downhole pressure sampling rate used on many operations today).
This work shows that surge and swab during drill pipe connections on floaters may challenge the available pressure window for some wells even in regions with calm weather such as Brazil. Managed Pressure Drilling (MPD) is a technique that improves control of the downhole pressure. It is, however, not possible to compensate fast downhole pressure transients, such as heave-induced surge and swab, using MPD choke topside. This is due to the long distance between the choke and the bit, which translates into a time delay in the same order of magnitude as typical wave and heave periods. A downhole choke combined with continuous circulation is one of potential solutions.
Surge and swab during drill pipe connections can result in a loss or an influx and should be considered in the well planning phase when mud weight, section lengths, etc. are selected.
Seymour, D. A. (Total) | Oyovwevotu, J. (Total) | Vavasseur, D. (Total) | Albores, S. O. E. (Tenaris) | Casares, V. (Tenaris) | Garcia, E. G. (Tenaris) | Innamorati, L. A. (Tenaris) | Izquierdo, G. A. (Tenaris) | Langrill, C. M. (Tenaris) | Mazzina, R. O. (Tenaris) | Mitchell, A. C. (Tenaris) | Santi, N. (Tenaris)
The Culzean field combines both UHPHT reservoir conditions and an unusually narrow drilling window, at the top of the main reservoir, where reservoir pressure lies on a regional ‘broken seal’ rock strength line. This drove a need to find an improved well architecture, to allow production wells to be drilled close enough to the reservoir crest to maximize gas production volumes.
The solution: to develop heavy, ultra-high strength, sour service tubulars and use these in a well layout more typical of Deep Water designs than North Sea HPHT wells. Instead of setting a full production casing string, before drilling the target reservoir, a short production casing liner is hung from the fully rated sour service intermediate string, and tied back after the reservoir section has been drilled and a production liner run. This greatly reduces drilling circulating pressure losses in the reservoir section, allowing crestal targets, whilst providing very robust intermediate and production casing strings for long term well integrity. The reduction in ECD combined with the use of MPD technology, enables the drilling of this complex reservoir, in a safe and efficient manner.
The Wisting Field is located offshore in the Barents Sea north of Norway. The field development requires drilling and completion of horizontal wells in a narrow pressure window, which is challenging for conventional technology. The Reelwell Drilling Method (RDM) provides a solution for managed pressure drilling (MPD) to mitigate these challenges. Based on the use of dual-channel drillpipe, RDM enables the pressure gradient in the openhole section to be held constant and nearly independent of the drilling fluid flow rate. RDM provides low-energy drilling, i.e., efficient drilling and hole cleaning when using low flow and low-drillstring rotation speed. This allows drilling of horizontal sections within a small pressure window and limits drillstring fatigue in high-dogleg applications.
In order to start qualification of RDM for the Wisting Field, a horizontal trial well was drilled in fall 2018 at the Ullrigg Drilling and Well Test Centre, located at the NORCE Norwegian Research Centre in Stavanger, Norway. The goal for this trial well was to prove the dual-channel drillpipe capability to perform low-energy drilling, i.e., low-rotary speed, low flow, and stable downhole pressure gradient. The trial well had a challenging geometry with up to 14°/30-m build rate, as required for the field. The 9½-in. horizontal section was drilled in order to check the performance of the RDM and start the qualification of the RDM for the Wisting Field.
The trial well was drilled with a low-flow motor, i.e., with flow rates around 700 lpm. The string rotation speed was held lower than 5 rpm to limit drillstring fatigue in the high-dogleg section of the well. Efficient drilling and hole cleaning of the 9½-in. horizontal hole section was demonstrated. The results from the trial confirm the predicted performance for the RDM. The results indicate that RDM can keep well pressure gradient within the required window and mitigate the drilling challenges for the Wisting Field. The RDM architecture with return flow in the inner string represents a major advantage to avoid cuttings build up in the well, challenges with laminar return flow, formation wash-outs, mechanical down hole dynamics and ECD control by low energy drilling.
Offshore and onshore reliability data (OREDA) gathered by several oil and gas operators for nearly 4 decades is now available online through DNV GL’s data platform, Veracity. The OREDA handbook, established in 1981 in cooperation with the Norwegian Petroleum Directorate, has collected data from almost 300 installations and includes 18,000 equipment units with 43,000 failure and 80,000 maintenance records. The databank also includes information on subsea fields with more than 2,000 years of operating experience. Working in partnership with French IT service provider SATODEV and OREDA member companies, the data were originally presented in a traditional handbook and have been converted to a digital tool called “OREDA@Cloud.” Instigated by a joint industry project (JIP), it allows users to have interactive access to the database.
The oil tanker Nave Andromeda off the coast of England on 25 October before British armed forces regained control of the ship. British armed forces forcibly boarded and regained control of an oil tanker in the English Channel on the evening of 25 October following a suspected hijacking, according to the UK defense ministry. The vessel, the Nave Andromeda, attracted attention after failing to dock as expected in Southampton on the south coast of England. A spokesperson for Hampshire police said that seven men were arrested "on suspicion of seizing or exercising control of a ship by use of threats or force." "They all remain in custody at police stations across Hampshire," the statement added.
Engie delayed its decision to sign a 20-year, $7-billion supply contract with NextDecade’s 27-mtpa Rio Grande LNG (RGLNG) project in Brownsville, Texas, following emission concerns from the French government. France has a 23.6% stake in Engie, which informed Reuters its board decided on 30 September it would give itself more time to study the contract, which “required a more detailed examination”. The supply deal would run until 2045, with exports expected in 2026. NextDecade did not address the matter, but already has plans in place to reduce emissions. The company said in July the project would utilize five LNG trains instead of its original plan for six.
The coronavirus crisis had a devastating effect on oil-company revenues, but it’s posed a tough human-resources problem too: how to keep workers safe on cramped rigs at sea where social-distancing is impossible. Many operators have found an answer in technology—specifically, digital twins. These interactive 3D simulations of oil platforms and plants allow engineers to avoid toiling for weeks in the sweaty, close confines of a wind-battered rig, instead gaining virtual access from home. Digital twins aren’t a new idea, but advances in computing—and widespread coronavirus restrictions—have helped them go mainstream in the oil industry, where the pandemic has swept through teams of engineers working elbow-to-elbow offshore. The North Sea has seen multiple cases of coronavirus among rig workers.
Kazazabrang Elijah Dauda was born in the beautiful city of Kaduna in Nigeria and began his formal education in De Kapital in Bwari, Abuja Nigeria before concluding primary education in Faith Foundation Nursery and Primary School, Kubwa, Abuja. He did very well in his National common entrance examination, which got him a scholarship to study in The school for the Gifted Child, Gwagwalada, Abuja in 2005 where he studied there for 2 years, but due to the lack of spiritual growth his parents transferred him to Baptist High School, Jos, which played a very vital and pivotal role in his life and subsequently graduated in 2012, then he got admitted to Ahmadu Bello University, Zaria to study Chemical Engineering. He excelled in that school and thus was awarded a scholarship to study Petroleum Engineering in Kazan, Russia in 2014 graduating in 2019 but due to tough financial circumstances in his family he had to go back home to support his family in 2019, which led to him taking an academic break and thus forfeiting one year of his scholarship which led to him applying for the Imomoh scholarship. He is now back in Russia to complete his studies and is very grateful for this opportunity.