Schlumberger

Water-Pack & Gravel-Pack Services

AquaPac integrated water-packing system

AquaPac water-packing system for openhole wells uses brine to carry and place gravel around preinstalled screens. It successfully addresses the challenges presented by many highly deviated openhole wells: low fracture gradients, reactive shales, and unstable boreholes. The entire process—design, execution, and evaluation—is supported by proprietary software to identify the optimal treatment options for your well.

Three-prong strategy for low-fracture-gradient formations

Gravel is conventionally placed in two waves. During the alpha wave, the gravel dune migrates evenly downward along the lower part of the well. When the toe is packed, pressure increases as the beta wave carries the dune back toward the heel to fill the top part of the wellbore. This increased pressure can cause the formation to fracture. The resulting fluid losses can trigger the creation of a gravel bridge that disrupts the beta wave and leaves sections of the screens unpacked.

Plugged Sand Screens Averted in Horizontal Well Through 124% Gravel-Pack Efficiency at –51 degF

The AquaPac system and MeshSlot premium sintered mesh screens provided effective sand control in openhole horizontal wells with a history of screen plugging and production decline. Read case study






The AquaPac system reduces friction pressure via

  • pressure attenuators—multiple pressure-activated diverter valves along the washpipe to reduce the length of washpipe through which the returning gravel-pack carrier fluid must flow
  • a friction reducer pumped in the carrier fluid
  • lightweight gravels that can be transported at lower flow rates.

Shale stabilizer to minimize fluid reactions and formation damage

Water-base fluids can cause shale to quickly swell, deteriorate, or both, resulting in an unstable wellbore, which can collapse and prevent screen installation or cause incomplete gravel packing. Water-induced spalling, or breaking up, of the shale can also cause premature screenout, impair pack porosity and permeability, or plug the screen, blocking production. The AquaPac system includes a shale stabilizer to inhibit these destructive brine-shale interactions.

Antiswab service tool—multiple benefits in a single trip

Stabilization of an unconsolidated sandface is vital to gravel-pack success. The Schlumberger antiswab service tool permits constant hydrostatic pressure in the open hole, eliminating the swabbing effects of hardware movement and ensuring filtercake integrity before gravel placement. The tool also isolates the packer-setting mechanism to prevent presetting caused by circulating pressures. After the excess gravel is screened out and reversed, the service tool allows spotting of filtercake removal treatments, eliminating a dedicated cleanup run.

 
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Shale Stabilizer Improves Water-Packing Effectiveness

AquaPac system shale stabilizerAquaPac
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