2018 Offshore Technology Yearbook

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Page 34 of 55 | December 2017 | 33 DRILLING TECHNOLOGY | 2018 OFFSHORE TECHNOLOGY YEARBOOK "We've had several runs in the GoM and off- shore Brazil. The first one we had in the GoM was with our 11625 Series of StingBlock cutters. That one was underreaming a pilot hole from 12 1 / 4 -in. to 14 1 / 2 -in. Immediately on back-to-back runs the customer saw an increase of footage of 97% com- pared to the offset runs and a 32% increase in ROP," he said. RSS built for sub-$50 oil price Weatherford is taking a back-to-basics approach to designing its tools for the current price environ- ment. The company began developing a new RSS in second-quarter 2016 that is simple to build, simple to operate and simple to repair and maintain even in remote locations. "We've seen a lot of different RSS models come on the market over the years, some of which have gotten very complex and are suited for a higher oil price environment like $100 per barrel," Weather- ford's Clegg said. "Many of the options that exist for RSS at the moment are not suitable for a $50 price environment." The company was careful to listen to customer input before designing the tool. "We designed it so that it uses the already established push-the-bit operating principle. The fundamental steering prin- ciple is the same as a number of tools that have been around for a while, but we also took into account our lessons learned from years of directional drilling to optimize control of the tool," he explained. A very high degree of control in terms of tool- face control and also true proportional bias con- trol were included. "You can drill straight with the RSS or you can switch it to maximum dogleg, or you can pretty much have any combination in between," he continued. The tool is brand-spanking new, literally out of the box. It's so new the name hasn't yet been final- ized. "We've had about six controlled field tests in the U.S., including a couple of horizontal sections. Toolface control has been excellent on every occa- sion," he added. The tool was designed as a very slick assembly to minimize hole problems, such as getting stuck for example, and to maximize the pass-through volumes for cuttings from the bit. "Speaking of bits, we also designed the RSS to work with any bit typically used with the most pop- ular RSS tools currently on the market. That way the operator doesn't need to purchase a specialized bit for each directional system," he said. "The ability to provide precise proportional con- trol in terms of dogleg coupled with the ability to provide precise toolface control will be very attrac- tive when you're drilling offshore," Clegg said. The tool is expected to be commercially avail- able in early 2018. Weatherford is working with a national oil company in the Middle East to deploy the tool in the first quarter. "In terms of application, I believe it is going to improve ROP and, more importantly, allow longer laterals to be drilled," he added. Downhole data in 45 seconds High quality gas analysis has been based on tak- ing samples every 30 ft, 90 ft or 120 ft, storing the samples in a tube or jar and sending them to a lab, which takes time before the results are available to the operator. "For most offshore drilling environments with this service, we typically see around a depth reso- lution of less than 1 ft per sample, as opposed to the typical lab environment of a sample point every 10 ft to 120 ft per sample," said Alex Bruns, global product champion for surface logging for Baker Hughes, a GE company (BHGE). The BHGE TRU-Vision quantitative gas extraction and analysis service provides a baseline separation of more than 27 gases—light hydrocar- bons from C1 to C8 (alkanes, alkenes and aromat- ics) and key inorganic compounds such as carbon monoxide, carbon dioxide, helium, etc. The sys- tem uses a gas chromatograph on the offshore rig for the analysis. "You're getting laboratory quality analysis at the rig with much better depth data and resolution than you would get in the laboratory, without com- promising data quality," he emphasized. The higher resolution provides a clearer understanding of formation fluid properties, such as fluid contacts, for a more detailed anal- ysis of the formation. All of this happens within 45 seconds.

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