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A customer wanted to plug and abandon (P&A) one of the deepest wells ever drilled in Vietnam. Another operator had attempted the P&A, but had failed after four days and many trial runs. The well had 20 in. (1 in. wall thickness [WT]) x 36 in. (2 in. WT) casing set at 2,172 ft (662 m) with water depth at 1,867 ft (569 m). The customer then called in Baker Hughes, a GE company (BHGE), who successfully performed the P&A in two days.

The customer had a second well needing a P&A and, because of BHGE’s successful first operation, hired BHGE to do the second operation. After careful planning and preparation, the BHGE team deployed a proprietary universal wellhead retrieving system (UWRS) for the Vetco Gray MS-700 high-pressure wellhead housing (HPWH) and HERCULES™ multistring cutter system to cut and recover the casing in one trip.

The HERCULES multistring cutter’s three knives were dressed with METAL MUNCHER™ advanced milling technology (AMT) carbide. METAL MUNCHER cutting inserts are extremely durable and greatly reduce milling time even through the most abrasive materials.

Download the PDF to read the full case study.

Challenges & Results
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Challenges

  • An operator failed to P&A the first well after 4 days and numerous attempts

Results

  • Cut and recovered 20-in. x 36-in. casing in one trip
  • No NPT incurred
  • Successfully and safely performed P&A on two wells