CATEGORIZED | News

Pre-planning critical to success of snubbing operations in HPHT shale wells

Posted on 24 March 2010

Schematic of an early design of a rig-assist snubbing unit.

Schematic of an early design of a rig-assist snubbing unit.

With coiled tubing becoming an increasingly difficult solution to well problems in the shale plays of Texas, snubbing has become a more viable method for dealing with HPHT environments, according to Steve Wehrenberg, US technical advisor for Boots and Coots, who made his presentation on “The Design and Application of Snubbing Units for  HPHT Environments” at the SPE/ICoTA Coiled Tubing and Well Intervention Conference in the Woodlands, Texas, on the 23 March.

One of Mr Wehrenberg’s main points emphasized the importance of pre-planning. “A lot needs to be done (on a snubbing project), and the purpose of this paper is to demonstrate the importance of doing your homework before you start,” he said.

Basing his example off of the UK model definition of an HPHT well, which includes pore pressure in excess of .8 psi/ft, undisturbed bottomhole temperature greater than 300°F and well control equipment rated greater than 10,000 psi, Mr Wehrenberg discussed the 460K hydraulic snubbing unit that was used to replace the coiled-tubing system on a Haynesville Shale well.

Mr Wehrenberg stressed the importance of calculating the tri-axial loading when pre-planning the well remediation operation, not looking toward a technical book to determine tri-axial proportions. His presentation noted that even though tri-axial loading is frequently named the cause of tubular failure downhole, it is often overlooked in pre-planning stages.

Early design of a multicylinder hydraulic snubbing unit.

Early design of a multicylinder hydraulic snubbing unit.

He advised the audience, “You’re going to have a lot of equipment out there, so send someone out (to the site) to inspect, because you can’t have everything showing up at once.”

Pre-planning  also lies in solidifying crew competency on the job site.

“Make sure the people involved have adequate skills to work in this demanding environment. Sometimes in this industry we are thrown into more hazardous situations, and you can’t just throw anyone out there,” he said.

Leave a Reply

*

FEATURED MICROSITES


Recent Drilling News

  • 01 October 2014

    Drillmec automated rig, drilling package designed to ensure safety, increase efficiency

    Drillmec has designed an automated drilling rig – AHEAD, Advanced Hydraulic Electrical Automated Driller – that reduces the rig footprint by approximately 50%...

  • 01 October 2014

    Noble Energy to resume exploration drilling offshore Falkland Islands

    Noble Energy.plans to resume exploration drilling in the Falkland Islands in 2015, following the acquisition and evaluation of an extensive 3D seismic program…

  • 01 October 2014

    Video: Schlumberger mapping-while-drilling service expands view around wellbore

    GeoSphere, Schlumberger’s new reservoir mapping-while-drilling service, optimizes well placement operations and steering capabilities with deep-directional...

  • 30 September 2014

    Statoil, Shell and Sonatrach awarded acreage onshore Algeria

    Statoil and Shell were awarded the Timissit Permit License in the Illizi-Ghadames Basin onshore Algeria. The license is in southeastern Algeria and covers an area of 2,730 sq km...

  • 29 September 2014

    Rosneft discovers oil in Kara Sea

    Rosneft successfully completed the drilling of the Universitetskaya-1 well in the Arctic – the northernmost well in the world, according to the company, and discovered oil at the East-Prinovozemelskiy-1 license area...

  • Read more news