18/08/2023

Foreword

 

Marwell are specialists in wellbore construction and completion. Born from the understanding that each well and each formation presents its own unique challenges, we have set out to develop and apply new and exciting technologies for ever-more challenging applications. To do this, we have partnered with industry-leading companies from across the globe to offer tailored solutions that are not available elsewhere on the market. Combining proven tools with our engineering approach we apply well-first thinking. Our partners Varel Energy Solutions are widely recognized for their products ingenuity, performance and reliability. Their Bladerunner centralizers are renowned for having ultra low friction characteristics and high strength construction. Through a shared drive towards building leading partnerships, Varel and Marwell work together to provide well construction solutions you can rely on. 

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With the successful partnership between Varel and Marwell we continue to strengthen the track record of the Bladerunner™ on the Norwegian continental shelf.

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Challenge

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Vår Energi had previously experienced challenges on the Balder field running 9 5/8’’ liners to TD due to creeping shale in the 12 1/4’’ drilled section. From previous experience, the ability to obtain rotation is crucial to be able to reach TD. The preliminary analysis showed that the maximum surface torque would be exceeded approximately 1000 m prior to TD and that they would be unable to work the liner down.

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Solution
 

The ability to work the liner down to TD was dependent on reduction of the rotational friction to initiate and maintain rotation through the areas with the creeping shale restrictions. Bladerunner™ Low Torque (LT) centralizers from Varel Energy Solutions were selected to lower the rotational friction in the casing. Low friction Teflon bands in the bore of the centralizer ensure extremely low start up torque so the probability to start rotation to work past tight spots in the open hole is significantly improved.

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Result

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A Bladerunner LT centralizer was installed on each joint along the 2000 m liner. Historical data showed a very high anticipated friction factor of 0,6 in the open hole. The actual friction factors with the Bladerunner LT installed proved to be 50% less than expected. After the successful liner installation the Vår Energi Drilling Engineer concluded; “The liner had to be worked past restrictions quite a few times with limited weight available. I doubt the liner would have reached TD without the Bladerunner centralizers”. With the implementation of the Bladerunner™ LT the customer were able to remove the swivel clutch in the drill pipe above the liner hanger running tool. The drill pipe swivel had been run on previous wells to reduce the axial friction of the string.

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ABOUT MARWELL

 

Marwell is an independent company specialising in wellbore construction and completion equipment. Established in 2019 in Stavanger, its goal is to bring new and innovative tools to markets where they are not yet available. Collaborating with some of the industry’s leading suppliers and service companies, Marwell’s expert engineering team further develop field proven technology to deliver unique and tailored solutions.

 

Saving operators time and money, while also improving performance, Marwell’s speciality lies in its well-first thinking, offering a bespoke approach to ever-more complex problems. For more information on Marwell AS and Varel Energy Solutions visit www.marwell-tech.no.

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For more information on Vår Energi please visit Vår Energi (varenergi.no)

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