The interaction of NOVATEK, Investgeoservice (IGS) and Schlumberger allowed to deliver 2 complex extended reach wells (ERD), including the longest ever drilled in Russian mainland, well number 373, in the Yurkharovskoye field located in Arctic Yamal peninsula, as part of the offshore development plan from onshore locations. A geomechanical model was developed to address the main challenges, including optimum equivalent circulating density window and drilling regimes for wellbore quality and stability. Drilling & Measurements key technologies, multipole sonic-while-drilling, latest high-speed telemetry service, multifunction logging-while drilling technologies were used for real time Geomechanics service to prevent costly wellbore stability issues. In addition the combination of rotary steerable technology with customized polycrystalline diamond compact bits and drilling fluid system, delivered superior drilling performance, resulting in high performed drilling of these complex wells. Positive experience in the construction of these ERD wells, gives grounds to include options for developing the region, similar wells in the planning stage of various development scenarios. This article devoted to the description of technologies and solutions that have been used for the construction of these wells.
As part of the field development plan Novatek, Russia's largest independent natural gas producer, recently planned an extended reach drilling (ERD) campaign at the Yurkharovskoye field, in the northern part of Western Siberia, Russia. The focus of this campaign is the development of an offshore part of the field from onshore locations using ERD techniques and implementation of new systematic approach -specific combinations of the drilling technologies, engineering and organizational solutions.Developed a new drilling program based on engineered drilling system (EDS) approach. Geomechanical model was created to address main challenges related to wellbore stability. Key drilling and measurement technologies, including multipole sonic-while-drilling, high-speed telemetry, multifunction logging-while-drilling technologies in combination with rotary steerable technology, polycrystalline diamond compact bits and oil-based drilling fluid were used to deliver superior drilling performance and control drilling regimes in real time. Another specific of this project was multilateral completion at TAML (Technology Advancement for Multi-Laterals) level 3 junction and the deepest casing exit from 178-mm string alone with the first in mainland Russia run of LWD tools for the direct formation pressure measurement while drilling.Four extended reach wells were drilled in this Yurkharovskoye ERD campaign with outstanding results in performance. Use of most advanced and superior technologies allowed setting several records for entire mainland Russia and to successfully drill and complete the longest ERD and longest multilateral ERD wells. A new approach in interaction between all participants in the project and engineered technological solutions as part of integrated drilling system was successfully implemented on all wells acknowledging its effectiveness in improving project performance and elimination of undesired incidents. Geomechanical model updated in real time was crucial in defining safe operational drilling parameters and regimes, together with precise drilling-fluid management, enabled rapid response to actual well conditions (i.e., fracture gradients, wellbore stability, hole cleaning and high torque) while drilling. Use of special casing milling system allowed performing whipstock orienting and casing exit in one run with full-size window at high inclination and long departure from surface. Well construction and production objectives were successfully archived and led to changes to the field development plan including planning new ERD wells for shallower pay zones on the field. This paper will describe how multidisciplinary well design and construction team addressed drilling challenges in variety of extended reach horizontal wells in Yurkharovskoye oilfield. Achieved results of new approach for complex technical projects will be presented; lessons learned and plans for future field development will be described.
A workflow was developed for effectively handling the development challenges in the Yamal oil and gas province of Western Siberia. The workflow integrates geomechanics with efficient drilling practices and leads to the implementation of an engineered drilling system (EDS). The workflow for development in the Yamal region encompasses phases from modeling to drilling practices, incorporating an understanding of challenges faced and lessons learned from previous drilling. The majority of Achimov operations in the Yamal region have been conducted in the Urengoy gas condensate field, which is divided into different blocks. The Achimov deposits are deep (true vertical depth is about 3,750 m), exhibit abnormally high formation pressure (over 600 atm), and contain multiphase hydrocarbons with the presence of heavy paraffins. Unstable shale formations must be drilled prior to penetrating the Achimov itself. These challenges affect drilling efficiency and interfere with the well construction schedule. The Achimov formations present two main challenges to horizontal drilling: wellbore instability leading to stuck pipe incidents in the build section or inability to run liner/casing to total depth and loss circulation, potentially compromising well delivery and project objectives. Thus, previous drilling has shown that developing and producing from these enigmatic resources requires more than just horizontal wells and hydraulic fracturing. Companies are aggressively pursuing Achimov deposits, hoping to extract additional gas and gas condensate volumes from the declining fields and to implement a strategy to raise natural gas production. Successful operations require an integrated approach, using multiple data sources, to determine the key parameters needed to understand the Achimov formations and extract the hydrocarbons. Among the successes, an operator company for Urengoy field demonstrated how developing a mechanical earth model (MEM) of the reservoir and continually improving processes paid big dividends. By implementing the EDS approach, unique results have been achieved in drilling and completion of Achimov horizontal wells. Outstanding drilling performance in Achimov horizontal wells has led to a revision of the field development plan.
The article is based on experience of drilling record Senomanian ERD wells on Yurkharovskoe field from the bank of the Tazovskaya Guba towards offshore.Core problem happening while drilling such extended wells is wellbore instability happening in mudstone intervals when drilling close to the bedding.This article is devoted to study of the specific breakout mechanism in mudstone at shallow depth and finding the solution for well trajectory optimization to prevent wellbore instability.The main problem was solved in the work is optimization of shallow Senomanian wells trajectories via geomechanical modeling coupling with drilling experience which allow to find the solution and solve the instability problems while drilling.Drilling experinse of Senomanian wells was analized and used for geomechanical model verification and chose the best wells trajectories.Feature of mudstone collapse while drilling close to bedding at shallow depth was investigated, also termal expansion effect and its inpact on wellbore instability was evaluated.The result of the work was trajectories optimization and succesfull drilling of Senomanian wells on Yurkharovsko? field. Drilled wells have record horizontal displasement from vertical among all wells on YaNAO.The aggregate results of engineering calculations and obtained experience of Senomanian wells drilling have perspective opportunities of design and construction of such wells in YaNAO.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.