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A customer operated a partially depleted field in deepwater Gulf of Mexico and was expected to intersect under-pressured formations during perforating operations.

Tubing conveyed perforating (TCP) is widely practiced in deepwater completions but the operation is not without its challenges. Safety is critical when perforating depleted or high permeability formations because fluid losses can quickly reduce the hydrostatic column in the well. As reservoirs are drawn down in the deepwater environment, this becomes an increasing issue. Amounts and rates of fluid loss or gain and the densities of the fluids in the wellbore become critical information. Maintaining balance in the well is a critical factor in addition to the difficult-to-measure fluid level in depleted cases.

The only conventional option for the customer was to use echometers but they are difficult to interpret, are non-continuous, interrupt rig operations, and are prone to misinterpretation due to erroneous reflections.

To overcome these issues, Baker Hughes, a GE company (BHGE), recommended the XACT™ downhole acoustic telemetry service. The tool continually sends annular and bore pressures every 20 seconds over the entire TCP run, including gun firing and tripping out of the hole. The completion fluid level was accurately calculated and monitored throughout the entire operation, thus enhancing well control and minimizing formation damage.

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Challenges & Results


  • Monitor completion fluid level during TCP operations
  • Overcome conventional disruption to rig activity


  • Provided real-time telemetry data no matter hole conditions
  • Incurred minimal impact to standard rig operations