NUT PLUG | Schlumberger

NUT PLUG

Lost circulation materials comprising ground walnut or pecan hulls

Nut-based lost circulation materials (LCMs) comprise ground walnut or pecan hulls and are used as a treatment for lost circulation. 

They are available in fine, medium, and coarse particle sizes, and may be used in all types and densities of fluid systems. Nut-based LCMs may be also used as a granular-type lubricant to reduce torque and drag.

Applications

Nut-based LCMs are effective, possessing high compressive strength. They are available from two sources: pecan and walnut, with walnut huslls being the stronger of the two. Treatment levels depend on the severity of the losses and type of formation where the losses occur. Typical preventative treatment levels are 6 to 14 kg/m3 [2 to 5 lb/bbl] for moderate losses and 14 to 71 kg/m3 [5 to 25 lb/bbl] for more severe losses. It may be used to treat the entire system or added as a high-concentration pill. Nut-based LCMs have a granular shape, and can be used in a blend of various sizes (fine, medium, and coarse) to prevent lost circulation or regain returns once losses begin. They also may be mixed with particulates of other shapes and sizes to provide a wide variation in particle properties for optimum control.

Nut-based LCMs can be added to other special slurries, such as high-fluid-loss squeezes, to assist in forming string bridging plugs.

They also can be used to reduce the coefficient of friction (CoF).

Can be used to treat the entire system or added as a high-concentration pill
Available in fine, medium, and coarse particle sizes
Can be added to other special slurries, such as high-fluid-loss squeezes, to assist in forming string bridging plugs

Advantages

  • Inert additive, compatible in all types and densities of fluids.
  • Will not ferment.
  • Unaffected by pH or temperature.
  • Based on particle shape, size, and compressive strength, it is a superior lost circulation additive.

Toxicity and Handling

Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions as described in the Material Safety Data Sheet (MSDS).

Packaging and Storage

Nut-based LCMs are packaged in 22.7 kg (50 lb), multi-wall, paper sacks. Store in a dry location away from sources of heat or ignition, and minimize dust.

Limitations

  • Larger-sized shale-shaker screens are needed to retain the material in the system.
  • When using large concentrations in nonaqueous fluids, increased amounts of wetting agent may be needed.
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