Unique P&A approach converted days per well to wells per day
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.
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