Hess in the Media: CT scanning extends life of Hess subsea tieback
Hess Corporation Logo header
SEARCH

Hess in the Media: CT scanning extends life of Hess subsea tieback

  • The Ocean BlackLion drillship
05.24.2016

The May issue of Offshore Magazine features an overview of Hess’ use of a computed tomography (CT) scanner during a recent subsea flowline inspection campaign to verify the integrity of locations that could potentially develop high levels of corrosion. The scanner allowed the company to verify integrity without interrupting production. Ultimately, this lowered finding, development, and acquisition costs and protected its continued license to operate.

The article was based on a technical presentation given by Hess Sr. Subsea Engineer Jason Harry at the Subsea Tieback Conference in March.

Only the second operator at the time to have successfully employed this technology globally, Hess found that employing CT scanning on the subsea flowline added value in multiple ways. Scanning the line without impacting production saved both time and money. The clarity of the scans made an accurate diagnosis of the problem possible, helping the company to identify the scale issue before it affected flow in the line. In addition, it confirmed that adding new, high-pressure wells to the brownfield flowline was a safe, value-adding decision.

Most commonly used in the medical field, CT scanning, also known as CAT scanning, is also applicable in the subsea environment. With the help of a remotely operated vehicle (ROV), a subsea scanner can wrap around a pipe up to 27-in. diameter and scan a 360°, 15-mm section using powerful gamma rays. These gamma rays penetrate the thick insulation surrounding the flowline and record the density distribution and wall thickness. The scanner then transmits a high-resolution (+/- 1 mm) image of the data to the offshore vessel executing the campaign. The image uses color coding to identify the densities of the materials present in the flowline. Unlike previous technologies, the subsea CT scanner’s non-invasive, highly accurate technique makes it possible to perform flowline inspections without interrupting production.

Hess’ inspection campaign took place in December 2014 at a single-well, 6-in. tieback in the Gulf of Mexico. The company had targeted the brownfield flowline for extended life based on the value of using its existing equipment; however, the flowline’s corrosion models were out of date. Hess had volumetric metal loss data for the flowline, but lacked clarity on wall thickness. To obtain this data, it decided to try the new, non-invasive CT scanning method.

Click here to read the article
Related News
  • Hess Wins 2018 Platts Global Energy Award for ‘Remarkable Execution Skills’ on Stampede Project

    Hess won the 2018 Platts Global Energy Award for Construction Project of the Year for its Stampede project, a deepwater oil and gas development in the Gulf of Mexico. Judges said the project showcased the company’s “remarkable execution skills” and described Stampede as a “sound investment” that positions Hess for continued success.
    Full story
  • Hess to Host Investor Day

    Hess Corporation will hold an Investor Day on December 12, 2018 at 1:00 p.m. CT in Houston, TX. The meeting will feature presentations by CEO John Hess and other members of the Hess leadership team.
    Full story
  • Hess Announces Regular Quarterly Dividend On Common Stock

    The Board of Directors of Hess Corporation today declared a regular quarterly dividend of 25 cents per share payable on the Common Stock of the Corporation on December 31, 2018 to holders of record at the close of business on December 17, 2018.
    Full story