2018 Offshore Technology Yearbook

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Page 36 of 55 | December 2017 | 35 DRILLING TECHNOLOGY | 2018 OFFSHORE TECHNOLOGY YEARBOOK to bring the sensors close to the formation to get a good measurement," he continued. The advantage over a wire- line is that the tool is rotat- ing and able to generate those images that are not available from the wireline density tool. "The deepest we've gone so far with this tool is 24,000 ft measured depth [MD]. So far we've been working in the range of 12,000 ft to 24,000 ft roughly," he added. Parker said Sperry is the only company with these larger size tools. Running the density tool for real-time data and dip estimation below salt in the larger bore sizes seems to be a more popular appli- cation now. "Eliminating the wireline run pro- vides the real savings potential for the customer. They can get the data without having to make a special trip or spending extra time on the rig," Parker emphasized. RSS designed for ERD wells Operators are looking for cost-effective ways to drill faster and longer laterals since the more foot- age that they can expose, the higher the level of returns, said Juan Restrepo, product champion for RSS for Schlumberger. "When you measure drilling efficiency, it can be seen in two ways—drilling faster and minimizing the number of BHAs used to drill to the objective. All the development we have had in recent years has to do with how to have the system provide a quality hole for our client in the shortest period of time," he continued. There are three points that have to be hit to reach new levels of performance—drill faster, the ability to drill longer wellbores in the target zone and provide high quality holes. "No matter how far you drill, if you don't have a hole that can be used, it is going to be a waste of time and money for the whole well construction and production process," he added. Schlumberger has added two new members to its PowerDrive RSS family. The PowerDrive Xcel RSS is focused on offshore and ultra-ERD wells, while the PowerDrive Orbit RSS is focused on land operations, including super laterals. "The ERD wells are getting longer and lon- ger so downhole automation is becoming more critical for the consistent performance of direc- tional tools building micro-tortuosities across the extended lengths reduces the amount of energy required for the actual drilling process," Restrepo explained. Each RSS has a distinctive design, but both the PowerDrive Orbit RSS and the PowerDrive Xcel build on their direction and inclination sensors close-to-the-bit to provide automated closed-RSS loops simultaneously on inclination and azimuth. Closing this loop downhole allows us to automat- ically hold any 3-D orientation vertically and later- ally for a given target, minimizing the interaction from the surface in the drilling process for faster penetration rates. "There are no more commands to be sent to the tool. The tool is going to measure its orientation downhole and do exactly what it needs to keep the target set," he said. That takes the human out of the equation. The PowerDrive Xcel RSS was designed for use in high-profile directional drilling operations. It provides inertial directional control in deviated sections—a feature that can be toggled on and off by a downlink. (Image courtesy of Schlumberger)

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