Overview


Challenges
  • Run operation from a DP2 semisubmersible rig
  • Perforate 656-ft zones in each well (10,915–11,571 ft in one, and 11,847–12,503 ft in the other)
  • Circulate, correlate, perforate, and stimulate in one CT run
Results
  • Completed two high-rate, big- bore, subsea gas wells in single CT runs
  • Saved 34 hours of rig time and an estimated USD 1.77 million
  • Reduced operational and safety risks
Case study details

The Malampaya gas field is located 49 miles (80 kilometers) northwest of Palawan Island, Philippines. For over a decade, this gas field produced enough natural gas to provide half the electricity needed to power Luzon Island, the largest island in the Philippines. A recent drop in production prompted the major operator to execute the second phase of its field development plan, which called for drilling two additional wells.

During the first phase of development, the operator collaborated with Baker Hughes to conduct perforating operations using coiled tubing (CT). There were five wells in the first phase, and each required accurate correlation of perforation depth and unloading of the well with nitrogen to create underbalance prior to perforating. Because of the complexity of the operation, the Baker Hughes team made a simulation run with a dummy- gun bottomhole assembly (BHA) to make sure the BHA drifted and reached the bottom of the well as required. The simulation mimicked the actual perforating operation, except that the guns were not live. After reviewing data from the simulation run and confirming depth and expected downhole conditions, the Baker Hughes team completed perforation operations with live 41⁄2-in. Predator perforating guns. This resulted in clean perforations on all five wells in Phase 1.

 

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