CATEGORIZED | News

Schlumberger-TESCO offer directional casing while drilling

Posted on 05 March 2008

DCwD also improves well control because it allows circulating while the BHA is being retrieved or run into the well. They also leave the casing at or near the bottom while the BHA is out of the well. During drilling, DCwD rotation strengthens the borehole wall because of the plastering effect, also known as smear or stress cage, which occurs in the narrow annulus. 

Used successfully in the North Sea

The first deployment of DCwD offshore was on a well drilled from the ConocoPhillips-operated Eldfisk Bravo platform in the Norwegian sector of the North Sea. Both the 10 ¾-in. and 7 ¾-in. sections of Well 2/7B-16A, totaling 10,968 ft, were drilled successfully and positioned as planned using retrievable BHAs that incorporated Schlumberger’s PowerDrive X5 rotary steerable systems, PowerPak straight positive displacement motors (PDMs), and Pulse telemetry and surveying systems. The casing strings were rotated at 20-30 rpm from the surface, and the PDMs provided an additional 130 rpm to the RSS, PDC bits and under-reamer. ROP was as high as 80 ft/hr. All directional objectives for the wellbore were achieved, with a maximum dogleg severity of 4.83deg/100 ft.

Leave a Reply

*

FEATURED MICROSITES


Recent Drilling News

  • 28 July 2014

    SDI completes 500th MagTraC MWD Ranging project

    Scientific Drilling International (SDI) has completed the 500th MagTraC MWD Ranging project. MagTraC was introduced in 1998 to target challenging applications...

  • 28 July 2014

    Modular offshore rig design reduces deployment costs

    William Jacob Management (WJM) has introduced an offshore rig design that reduces deployment costs and improves speed-to-market for upstream operations. The 3,000-hp...

  • 23 July 2014

    Halliburton promotes Jeff Miller to President

    Halliburton has promoted Jeff Miller to President and has appointed him to the Halliburton Board of Directors effective 1 August 2014. Mr Miller is currently the...

  • 23 July 2014

    Statoil resumes production on Njord A platform

    Statoil has resumed oil and gas production on the Njord A platform in the Norwegian Sea, after a major reinforcement of the platform structure. Production had been shut down...

  • 22 July 2014

    Petrobras’ domestic oil production tops 2 million bbl/day in June

    Petrobras’ June oil production in Brazil averaged 2 million bbl/day (bpd), a 1.7% increase from May’s production of 1.9 million bpd. In addition, the production operated...

  • Read more news