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Innovating While Drilling®

Expandable liner system mitigates geological challenges, predictably maintains hole size in Ekofisk wells

Expandable system proved to be key enabler for ConocoPhillips as it redeveloped parts of Greater Ekofisk Area Drilling the lower overburden section in specific parts of the Greater Ekofisk Area (GEA) in the Norwegian North Sea can be very troublesome. Wells in these parts may intersect shales with high gas content in the upper section (requiring high mud weight) and unstable zones with massive circulation risk (requiring low mud weight) near the base of the interval.  These challenges have brought forth the need for a contingency drilling liner to “split” the section in two parts. Rather than changing the basic well design, ConocoPhillips fronted the development of an 8 ⅝-in. expandable drilling liner with high collapse resistance for this purpose. This string provides an ...

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Drill pipe logging sub uses real-time downhole data to improve liner, lower completion installations

Tool leverages wired drill pipe platform to eliminate guesswork at surface, reduce NPT By Kim Mathisen, Tore Sorheim, Vijay Kumar Keerthivasan and Dustin Young, NOV Completion; Stephen Pink, NOV Wellbore Technologies In the well construction process, after pulling standard instrumented bottomhole assemblies (BHA) to surface, the subsequent liner deployment typically happens without any sort of downhole sensors or diagnostics. The liner is often subjected to the most strenuous conditions during well construction, and an unsuccessful installation can add significant amounts of nonproductive time (NPT) and other costs for operators.  Surface data, torque and drag simulations, as well as previous experience, are commonly used to plan and facilitate liner installations. However, field development campaigns often present challenges that cannot be sufficiently planned for by ...

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Automated directional drilling gaining trust among industry users

Innovations in software continue to enable better predictive capabilities, helping operators achieve repeatability and consistency in their wellbores By Stephen Whitfield, Associate Editor Unpredictable directional drilling performance can have a significant detriment on a drilling operation, leading to higher costs and potentially missed production. While many directional drillers perform at a high level, the practice of accurately predicting drill bit positioning and trajectory is difficult to master, and the human element means that failure is always a possibility. To address these issues, the industry has increasingly looked to automation of directional drilling. Repeatability and consistency are recognized as the bedrock of the value around these automated systems.  “Drilling a record one day and then falling behind your expected days on ...

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Better understanding of data, physics key to BHA optimization

Companies realizing that a more holistic approach may be needed to enable precise directional control while optimizing ROP By Stephen Forrester, Contributor In an industry that continues to face financial headwinds, it is more important than ever that drilling is a cost-effective endeavor. Solutions over the past decade have achieved some success in the cost per foot of drilling, but those solutions have often focused on optimizing individual items within a given bottomhole assembly (BHA) – for example, implementing a more powerful motor or a more precise rotary steerable system (RSS). Although such pieces of equipment and technology, when incorporated individually into a BHA, can improve some performance metrics, the current market environment demands more holistic BHA optimization to achieve better ...

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