G-SEAL PLUS and G-SEAL PLUS COARSE Wellbore Stabilizing Agent | SLB


Wellbore stabilizing agents

Schlumberger Oilfield Services

G-SEAL PLUS and G-SEAL PLUS COARSE wellbore stabilizing agents bridge and seal porous and fractured formations in water-, oil-, and synthetic-based drilling fluid systems.

When used to drill depleted zones with high differential pressures, the products' bridging and plugging capabilities reduce differential-pressure sticking tendencies. Both products can control seepage, decrease partial and severe lost circulation, and reduce torque and drag. G-SEAL PLUS and G-SEAL PLUS COARSE agents are chemically inert and will not affect the rheological properties of drilling fluid systems when used at the recommended concentrations.


  • For seepage losses (<10 bbl/h [1.6 m3/h]): 15 to 20 lbm/bbl [43 to 57 kg/m3] in spotted pills. The pills can be incorporated into the entire system for a total concentration of 10 to 20 lbm/bbl (29 to 58 kg/m3), but close monitoring of the shakers is required.
  • For partial losses (10 to 100 bbl/h [1.6 to 16 m3/h]: 20 to 50 lbm/bbl [57 to 143 kg/m3] in spotted pills. Extrahigh-permeability formations such as fractured carbonates and conglomerates may require higher concentrations of G-SEAL PLUS or G-SEAL PLUS COARSE agents in conjunction with other lost circulation materials of varied appropriate size distribution.

Both agents can also be used dry-blended with cement to effectively seal off induced fractures and inhibit further propagation while cementing casing. Torque and drag may be reduced by incorporating sweeps of G-SEAL PLUS or G-SEAL PLUS COARSE agents into the active system up to a total concentration of 20 lbm/bbl [57 kg/m3]. Initial treatments for the active system may be added in 4-lbm/bbl [11.4-kg/m3] increments while monitoring torque and drag.

G-SEAL PLUS and G-SEAL PLUS COARSE agents may require additional wetting agent when used in an oil- or synthetic-based drilling fluid system.

Toxicity and handling

Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions described in the safety data sheet.

Packaging and storage

G-SEAL PLUS and G-SEAL PLUS COARSE agents are packaged in 25-lbm [11.3 kg] multiwall paper sacks. Store in dry, well-ventilated area. Keep container closed. Store away from incompatibles. Follow safe warehousing practices regarding palletizing, banding, shrink-wrapping, and stacking.