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

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

  • The Ocean BlackLion drillship

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for extended life based on the value of using its existing equipment; however, the flowline’s corrosion models were out of date.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
Latest Hess News
  • Hess in the Media: Unraveling the Bakken's EOR complexity

    Building on the many years of experience it built in its Permian Basin enhanced oil recovery (EOR) operations, Hess began an EOR R&D project in 2015 in the Bakken Shale. In 2016 the company drilled a gas injection and a production well targeting the Middle Bakken at Ross Field in Mountrail County, N.D., in the company's Red Sky acreage as part of the project.
    Full story
  • Hess Announces $1.0 Billion Share Repurchase Program

    The Hess Board of Directors has authorized the purchase of $1.0 billion of Hess common stock by the end of 2018. The newly authorized program is in addition to the $500 million share repurchase program Hess announced in late 2017.
    Full story
  • Hess Announces Seventh Oil Discovery Offshore Guyana

    Hess announced a seventh oil discovery offshore Guyana, following drilling at the Pacora-1 exploration well. The Pacora-1 well is located approximately four miles west of the Payara-1 well, and follows previous discoveries on the Stabroek block at Liza, Payara, Liza Deep , Snoek, Turbot and Ranger.
    Full story