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In early 2017, a major operator began an asset retirement campaign, abandoning 3,000 to 4,000 wells on 311 platforms in the Gulf of Thailand.

Plug and abandonment (P&A) operations were split into two phases―lower (reservoir) and upper (intermediate) abandonment. The scope of work included four different well types with pipe sizes ranging from 2 7/8-in. tubing to 30-in. conductors.

Days per well reduced

The operator contacted Baker Hughes, a GE Company (BHGE) to perform P&A operations on 20 shallow-water wells on the first platform. This included tubing pulling, casing cutting and pulling, cementing services, mechanical plug setting, and well integrity evaluation. These wells were constructed with a 9 5/8-in. x 7-in. x 2 7/8 in. casing configuration.

Download the PDF to read the full case study.

Challenges & Results
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Challenges

  • Inadequate well information
  • Highly corroded, leaking, and parted surface casing
  • Cemented nested casing strings and twin well conductor removals
  • Plugged tubing IDs and stuck barrier plugs

Results

  • Completed 280 well P&As on 16 different platforms within nine months on a single rig
  • Reduced on-well time from average 1.1 days to 0.4 day
  • Successfully ran more than 300 cement retainers and bridge plugs
  • Saved trips by combining cement retainer setting and pressure testing with a packer in a single trip
  • Executed another 94 well P&As on 14 platforms from different rigs to fill-in the drilling schedule; successfully ran more than 100 bridge plugs and cement retainers