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In January 2017, a major operator began decommissioning its retirement asset inventory of 3,000 to 4,000 wells on 311 platforms in the Gulf of Thailand. Plug and abandon (P&A) operations in these wells were classified into two phases— lower (reservoir) and upper (intermediate) abandonment.

The operator’s well stock had four different types of casing and tubing configurations, making it easier for a onesize- fits-all tool configuration for the entire work scope. Casing and tubing scheme for wells in these assets included:

  • 9 5/8-in. x 7-in. x 27/8-in. well configuration
  • 30-in. x 20-in. x 133/8-in. x and 95/8-in. x 7-in. x 31/2-in. well configuration
  • 30-in. x 20-in. x 133/8-in. x 7-in. x 27/8-in. well configuration
  • 26-in. x 133/8-in. x 95/8-in. x 7-in. subsea tie-back well configuration

The operator contacted Baker Hughes, a GE company (BHGE) to perform P&A operations, including tubing pulling, casing cutting and pulling, cementing services, and casing/tubing integrity verification on all 20 wells on the first platform. The shallow-water wells were constructed primarily with 95/8-in. x 7-in. x 27/8-in. casing and tubing configurations.

Download the PDF to read the full case study.

Challenges & Results


  • Inadequate well information
  • Highly corroded surface casing
  • Twin well conductor removal
  • Parted 95/8-in. surface casing and casing leaks
  • Plugged tubing ID
  • Stuck barrier plug


  • Deployed tension set packer for casing isolation and pressure test in combination with cement retainer setting tool
  • Completed P&A on 20 wells, reducing on-well time from average 1.1 days to 0.5 day, saving the operator an estimated $1.6 million USD