This paper will present the integrated extraordinary solutions founded during Extended-Reach Drilling (ERD) campaign on Lebedinskoye oilfield, which is located on the Northern East shelf of Sakhalin Island. As a green field, Lebedinskoye had a high level of geological uncertainty. Specifics of location made the well profiles complex - with a high Directional Difficulty Index – DDI (SPE ref. 59196) up to 7.2 and ERD ratio up to 2.94. Island logistics imposed critical constraints to the project planning. Rosneft and Schlumberger established the goal to optimize the well construction time to bring additional savings in the period of industry downturn. At the same time, a project team set ambitious goals to plan and execute operations to a safe and high quality standard. An integrated approach was deemed essential for success of such complex project. Integration provided a seamless interface bridging multi-discipline solutions and technologies to ensure high quality planning together with risk management. Several technologies in the project were implemented for first time in Russia. A "point the bit" rotary-steerable system enabled drilling the 17 ½" section in the one run of 2168m. A non-cemented liner eliminated the additional cost and time for a cement job as well as the potential impairment of the pay zone. The project team successfully run floated 9 5/8" casing to the final depth and eliminated major risks of the campaign. The Lebedinskoye was the first time the client implemented advanced LWD tools for deep reservoir mapping. In the result, 97% of 1962m horizontal section placed in the target zone, which became a new record for the Client. Finally, integrated approach, new technologies and solutions reduced well construction time by 25% as compared to similar offset extended-reach wells and made the project economical efficient in the period of downturn.

The Kuyumbinskoe field is a remote location, situated in the central part of Eastern Siberia 1000 km to the North from the nearest city of Krasnoyarsk (Figure 1). Weather conditions in this region are severe. Project logistics are complicated. There are no roads available for nine months of a year. Heavy load transportation is only possible in the winter period via ice roads. During the rest of the time, the only means of transportation are helicopters. The Kuyumbinskoe field is known for its intensive oil exploration activity. The oilfield has been proven for its strategic importance for meeting production quotas to China. However, only two horizontal wells were drilled in the past with maximum horizontal drain lengths of 300 m. One of the main geological challenges is the presence of extensive natural fractures in each section of the well. Drilling through those naturally fractured formations leads to wellbore stability issues and severe or total drilling fluid losses especially in production formation which are extremely difficult to manage. In 2013 it was determined that an Integrated Services approach would be the best model to define optimum technologies, gain necessary experience of horizontal drilling, improve well construction efficiency and to update geological model for further field development. This approach was vital for the successful fast tracked mobilization of materials and equipment to this remote field by winter road and without the need of further helicopter delivery. Six horizontal wells with pilots and more than 700 m of horizontal drain were drilled between April 2013 and November 2014 wherein 100% of the geological targets and drilling objectives were achieved. This paper will demonstrate how the Integrated Services approach, collaboration, risk analysis and contingency planning, special equipment, technologies and innovations were applied for successful accomplishment of the project objectives. Drilling efficiency was increased by 60% in comparison with the previous experience in this field with complex geological conditions. The first wells were successfully put into production ahead of the plan.

This paper describes some of the major issues around drilling world class ERD well in the Baltic Sea by a team of industry professionals from Lukoil, Schlumberger and Eurasia Drilling Company (BKE). The ultimate goal of the well construction organization was to deliver quality well under budget and within schedule with zero environmental impact.A challenging well was successfully drilled to explore Cambrian production zone in D-41 structure. Key contributing factors to this success were:solid preliminary analysis, understanding of well bore stability by real time geomechanical modeling, comprehensive directional analysis, revised casing design, application of latest drilling technologies, creation of multi-discipline team with common goals.

Авторское право 2013 г., Общество инженеров нефтегазовой промышленности Этот доклад был подготовлен для презентации на Конференции SPE по разработке месторождений в осложненных условиях и Арктике 15-17 октября 2013 года в Москве, Россия.Данный доклад был выбран для проведения презентации Программным комитетом SPE по результатам экспертизы информации, содержащейся в представленном авторами реферате. Экспертиза содержания доклада Обществом инженеров нефтегазовой промышленности не выполнялась, и внесение исправлений и изменений является обязанностью авторов. Материал в том виде, в котором он представлен, не обязательно отражает точку зрения SPE, его должностных лиц или участников. Электронное копирование, распространение или хранение любой части данного доклада без предварительного письменного согласия SPE запрещается. Разрешение на воспроизведение в печатном виде распространяется только на реферат объемом не более 300 слов; при этом копировать иллюстрации не разрешается. Реферат должен содержать явно выраженную ссылку на авторское право SPE.

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