CATEGORIZED | News

New swellable system seals microannular voids, centralizes pipe

Posted on 03 February 2010

Weatherford International launched its Micro-Seal system, designed to isolate microannulus pressure and avoid remedial cementing operations, at the 2010 IADC/SPE Drilling Conference in New Orleans on 2 February. The system features proprietary hybrid-swellable elastomer elements that allow it to conform to and seal against microannular voids between the cement sheath ID and the casing OD to improve overall cement integrity. When combined with the right centralizer technology, mud removal during primary cementing operations can be improved, thereby improving wellbore stability.

Above is an example of  a bow-spring centralizer. Weatherford’s Micro-Seal system can be utilized with a company’s bow-spring centralizer or rigid centralizer. This system is based on using swellable elastomers that is activated by oil and/or water to conform with changes in well dynamics.

Weatherford’s Micro-Seal system can be utilized with its bow-spring centralizer (shown above) or rigid centralizer. The system is based on using swellable elastomers that is activated by oil and/or water to adjust to changes in well dynamics.

Distributed along the cemented tubulars, the swellable seals provide a series of response points that ensure fluid migration is met and stopped wherever it enters the microannulus between the pipe and cement.

Unlike conventional, single-fluid swellable elastomers, this technology is based on swellable elastomer that is activated by oil, water or a mixture of both. The elastomer is formulated to meet specific swelling objectives and wellbore compatibility issues as the well dynamics change over time. The hybrid elastomers in the system are a relatively slow swell-rate formulation, designed for microannulus isolation. However, these elastomers can also be customized to address specific design objectives in terms of swell time, swell ratio and temperature stability.

Micro-Seal products consist of a slip-on seal unit that can be used alone or in conjunction with the company’s bow-spring centralizer, bow-spring centralizer sub or rigid centralizer. These can be used in well construction applications such as ultra-tight clearance casing programs, underreamed open-hole sections, extended-reach wells, gas or LPG storage wells, injection wells, wells to be fractured, and any well with a risk of microannular fluid migration.

Weatherford is offering models and an animation of these cement assurance tools at Exhibit #607 to at the Drilling Conference.

Leave a Reply

*

FEATURED MICROSITES


Recent Drilling News

  • 19 September 2014

    Video: Standardized communication key to progress of automation

    As automation technologies develop, it’s critical for the industry to establish standardized means of communication and terminology, John Berra, former Chairman of Emerson...

  • 19 September 2014

    Video: Gene Facey receives IADC Exemplary Service Award

    Gene Facey, a passionate volunteer and representative of the offshore drilling industry, recently was recognized with an IADC Exemplary Service Award. Stephen Colville, IADC...

  • 19 September 2014

    Video: NOV developing device to provide real-time drill string, wellbore data while tripping

    National Oilwell Varco (NOV) is expanding the efficiency and safety benefits of wired drill pipe to tripping activities. Brian Van Burkleo, Business Development...

  • 19 September 2014

    Video: IADC ART Subcommittee evaluating cyber security standards for drilling contractors

    The IADC Advanced Rig Technology (ART) Committee’s Drilling Control Systems (DCS) Subcommittee was created to provide information and guidelines to improve safety...

  • 19 September 2014

    ExxonMobil to add 17,800 net acres in Permian Basin

    ExxonMobil has entered an agreement with LINN Energy to add 17,800 net acres in the Permian Basin to its US oil and natural gas portfolio managed by subsidiary XTO Energy. In the exchange, LINN Energy will...

  • Read more news