Pushing the Extended-Reach Envelope at Sakhalin: An Operator
- Michael W. Walker (ExxonMobil Development Co.)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Drilling Conference and Exhibition, 6-8 March, San Diego, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2012. IADC/SPE Drilling Conference and Exhibition
- 1.9.4 Survey Tools, 2.3.3 Flow Control Equipment, 1.6.1 Drilling Operation Management, 2 Well Completion, 1.12.6 Drilling Data Management and Standards, 1.6.10 Running and Setting Casing, 1.5.1 Bit Design, 1.7 Pressure Management, 1.10.4 Onshore Drilling Units, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 1.6.6 Directional Drilling, 1.6 Drilling Operations, 2.4.3 Sand/Solids Control, 1.12.1 Measurement While Drilling, 4.1.5 Processing Equipment, 1.11 Drilling Fluids and Materials, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6.2 Technical Limit Drilling, 3 Production and Well Operations, 1.14 Casing and Cementing, 1.10 Drilling Equipment
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ExxonMobil, as operator for the Sakhalin 1 project, recently completed drilling operations at the Odoptu Field, located offshore Sakhalin Island, Russia. The Odoptu development drilled nine extended reach wells from shore, culminating with the world record reach OP-11 well. This record setting extended reach well reached a total depth of 12,345 m MD (40,502 ft) / 1,784 m TVD with 11,479 m of vertical section in 60 days with <1% non-productive time. This paper provides a case history of the drilling and completion of the OP-11 well. The major well design parameters that led to the final design will be discussed. Additionally, operational summaries for each hole section will be provided to give an insight on the well construction process.
Use of extended reach drilling (ERD) practices has become a common means to economically access reserves from existing infrastructure, provide access to reserves that were previously out of reach, and reduce the environmental footprint of drilling / production facilities. Hence, operators are being challenged to stretch the limits of the ERD envelope, not only from a drilling perspective, but also from a completions perspective. The design for such wells typically employs detailed modeling work; however, a thorough understanding of ERD operational complexities is also required.
Over the course of drilling operations at Odoptu, well designs and operational practices evolved to maximize drilling performance while minimizing risks. This paper describes the challenges that were successfully overcome, including wellbore instability, shocks and vibrations, and high torque. Significant OP-11 results include the successful placement of the 9-5/8-in. floated liner at 10,758 m without rotation and the successful placement of completion equipment at world record depth. The operator's use of its performance management workflow successfully reduced downhole shocks and vibrations, optimized hole quality, and resulted in the drilling of each hole section with a single bottomhole assembly (BHA).
The design considerations and techniques described in this case history can be used to provide valuable insight for the drilling and completion of future extreme ERD wells. The lessons learned on extreme ERD wells should be thoughtfully considered when designing future wells that stretch the ERD envelope.
The Sakhalin 1 project is comprised of the Chayvo, Odoptu, and Arkutun Dagi fields, located off the East coast of Sakhalin Island, Russia (Fig. 1). Development operations began in 2003 at the Chayvo field with the Yastreb land rig and were complimented in 2005 with development drilling operations from the Orlan platform. In 2009, the Yastreb rig was moved to the Odoptu Field, approximately 75 km North of its previous Chayvo location. At Odoptu, nine ERD wells were drilled from 2009 through 2011 targeting Miocene sands. Production and drilling facilities are under construction for the Arkutun Dagi field development where drilling is expected to begin in 2014.
As of January 2011, 15 of the 20 longest reach wells in the world had been drilled in the Sakhalin 1 project with the Odoptu OP-11 surpassing the 2008 Maersk BD-04A well in Qatar (Sonowal, et al, 2009). As ERD drilling techniques and development needs evolve, additional record reach wells will undoubtedly be drilled. Planning is underway to drill wells with measured depths in excess of 13 km as part of the Sakhalin 1 development.
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