Product Sheet M-I SEAL Lost Circulation Material
An all-purpose additive designed to reduce severe lost circulation as well as minor seepage losses.
M-I Seal* lost-circulation material (LCM) is an all-purpose additive designed to reduce severe lost circulation as well as minor seepage losses.
The product is effective when drilling highly porous matrix formations that are fractured or vugular. M-I Seal material is a specialized blend of flake, granular, and fibrous materials, thus making it considerably more effective than using only single types of LCM. The material composition of M-I Seal allows it to be used in virtually all lost- circulation applications and loss-prevention situations without the need to combine or blend other LCM. M-I Seal lost-circulation material is available in fine, medium and coarse blends.
|Typical Physical Properties|
|Physical appearance||Blend of flake, fibrous and granular particles|
|Fine particle size||20% retained on a 20 mesh screen|
|Medium particle size||20% retained on a 12 mesh screen|
|Coarse particle size||20% retained on a 8 mesh screen|
M-I Seal lost-circulation material is designed to plug void spaces or channels, thereby preventing or reducing whole mud losses to porous, vugular or fractured formations. M-I Seal material has a wide range of particle sizes and shapes to enhance its plugging or Sealing ability.
For minor or slow seepage mud losses, M-I Seal material may be added directly to the active mud system through the mud hopper. For most loss situations, normal treatments call for concentrations ranging from 5 to 20 lb/bbl (14 to 57 kg/m3). For severe losses, higher concentrations may be required to reduce losses to the formation.
For severe loss situations, it is recommended that M-I Seal LCM be used as a slug or batch treatment. For these treatments, the slug or “pill” should be spotted adjacent to either the casing shoe or at the bottom of the hole, depending on the location of the loss zone. Afterwards, the pill should remain in place for several hours to allow time for the zone to Seal and heal.
For pill and slug treatments, normal concentrations of M-I Seal material range from 15to 30 lb/bbl (43 to 86 kg/m3 as higher concentrations >30 lb/bbl (86 kg/m3) normally are not more effective. Batch treatments are often preferred to treating the entire system in an effort to minimize shaker losses and avoid bypassing shaker screens, thereby reducing mud contamination from drill solids.
M-I Seal lost-circulation material has applications in both water-base and oil-base muds. For oil-base mud systems, large treatments with M-I Seal material will require increased treatments with surfactants to prevent water-wetting of solids.
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).
M-I Seal lost-circulation material is packaged in 50-lb (22.7-kg) multi-wall paper sacks. Store in a dry location away from sources of heat or ignition, and minimize dust.