CATEGORIZED | News

New composite mat pills target lost-circulation during drilling, cementing

Posted on 03 March 2011

The Losseal pill is a flexible fiber additive that uses synergy between physical characteristics of fibers and solids to bridge fractures.

The Losseal pill is a flexible fiber additive that uses synergy between physical characteristics of fibers and solids to bridge fractures.

Schlumberger launched the Losseal family of reinforced composite mat pills on 2 March at the 2011 SPE/IADC Drilling Conference in Amsterdam. The system combines fibers and solids into specifically engineered pills to reduce nonproductive time (NPT) by mitigating the risk of lost circulation during drilling and cementing operations.

“Lost circulation problems that can occur during primary cementing due to unpredictable downhole conditions, ineffective mud removal or poor zonal isolation result in expensive and time-consuming remedial cementing jobs,” said Dominique Guillot, Well Integrity cementing domain manager, Schlumberger Well Services. “Losseal technology reduces the risk of lost circulation during drilling and cementing operations.”

Schlumberger has successfully deployed the Losseal system in Mexico, the Middle East and Europe. In Mexico, PEMEX was encountering lost circulations problems with wells in the carbonate Costero field near Villahermosa. Losseal mat pills cured the mud loss problems that PEMEX had encountered while also increasing mud density and effectively cementing the well without any losses.

“Having the ability to resume drilling soon after severe losses was a valuable gain,” said Ignacio Ramirez, sub-manager for Engineering and Design, PEMEX. “We were able to maintain that effect all the way through the cementing process, which was also extremely valuable.”

Traditional fiber treatments for lost circulation have relied on data for the fracture width during bridging and plugging. The Losseal design combines fibers with different mechanical properties and high solids content, making it less sensitive to fracture sizes, as the solid particle size is optimized to plug the network fibers as opposed to the fractures.

The Losseal pill is a flexible fiber additive that uses synergy between physical characteristics of fibers and solids to bridge fractures that can lead to either partial or total losses while drilling. An impermeable grid is created by the system, which is strong enough to withstand additional pressure from mud density increases, in addition to other pressures from future drilling or cementing operations. The system also addresses large losses in fissures, which can potentially sve thousands of barrels of mud during placement.

These reinforced composite mat pills can be applied to circulation losses while drilling, including those greater than 40 bbl per hr. The system can also be used with natural fractures, in dolomite and carbonate zones, and in spacers ahead of cement slurries.

Losseal is a trademark of Schlumberger.

Leave a Reply

*

FEATURED MICROSITES


Recent Drilling News

  • 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...

  • 26 September 2014

    Statoil and PL713 partners discover gas in Pingvin prospect in Barents Sea

    Statoil has together with PL713 partners made a gas discovery in the Pingvin prospect in the Barents Sea. The discovery is a play opener in an unexplored frontier…

  • 26 September 2014

    Maersk Drilling names fourth ultra-deepwater drillship, delivery expected in Q4

    Maersk Drilling’s fourth ultra-deepwater drillship was named Thursday morning in a ceremony at the Samsung Heavy Industries (SHI) shipyard in Geoje-Si...

  • 25 September 2014

    Eni awarded 3 new exploration licenses in Egypt

    Eni was the successful bidder of three new exploration licenses in Egypt as a result of the competitive 2013 EGPC and EGAS bid rounds. The new licenses will be formally awarded after the ratification...

  • Read more news