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

  • 15 September 2014

    US Treasury announces expanded sanctions with Russian companies

    US Treasury Secretary Jacob J. Lew has announced that persons operating within Russia’s defense and related materiel sector may now be subject to targeted sanctions…

  • 11 September 2014

    Cameron elects Scott Rowe as President and COO

    Scott Rowe will assume the newly created position of President and COO of Cameron, effective 1 October 2014. In his new role, he will report directly to Jack Moore, Chairman and CEO of the company...

  • 11 September 2014

    Statoil, GE and Ferus Natural Gas Fuels expand flare gas solution in Bakken

    A joint venture of GE and Ferus Natural Gas Fuels (Ferus NGF), along with Statoil plan to expand a pilot project to capture flare gas and use it to power up to six...

  • 10 September 2014

    6 elements of successful collaboration among NOCs, IOCs, service companies

    The oil and gas landscape is shifting, with the continuing growth of NOCs and the industry going toward unconventional resources and new frontiers…

  • 09 September 2014

    PTTEP: NOCs, IOCs and service companies must combine strengths to overcome challenges

    As assets become more mature and operations become more complex, industry is challenged with finding economical and environmentally friendly operating strategies...

  • Read more news