Product Sheet OPTISEAL I, II, III & IV
Designed to plug fracture apertures up to at least 1,200 μm, as well as provide fluid-loss control in moderate-to-high-permeability formations.
OPTISEAL wellbore strengthening material (WSM) blend plugs fracture apertures up to 1,200 um while providing fluid-loss control in moderate- to high-permeability formations.
Laboratory testing has confirmed the blend's fracture sealing and fluid-loss-control performance.
|Typical Physical Properties|
|Physical appearance||White to gray or tan|
|Solubility in water at 68 degF [20 degC]||Insoluble|
|Nominal median particle size (d50)||500–600 um|
All four blends are designed for loss zones with maximum openings of at least 1,200 um and can effectively reduce the potential for differential sticking, lost circulation and torque and drag through improved sealing of problem zones.
|OPTISEAL I Blend
||OPTISEAL II Blend
||OPTISEAL III Blend
||OPTISEAL IV Blend
|Graphitic material||Graphitic material||Graphitic material||Sized marble
|Ground nut shells||Sized marble||Sized marble and cellulosic material|
Remedial lost circulation treatments. The basis of design for the treatment is a low-fluid- loss WSM formulation. The blends can be slurrified at the rigsite from sacks or big bags. An alternative is to premix the WSM at a liquid mud plant in a high-volume, high-density slurry before shipping to a rig. The WSM slurry uses the same base fluid as the drilling fluid but is unweighted. The slurry provides greater flexibility, improved logistics, and reduced hazards associated with sacked materials. Typical final concentrations range from 30 to 70 lbm/bbl [85 to 200 kg/m3] depending on severity of losses.
Preventive treatments. The basis of design for the treatment is continuous particle addition to the circulating drilling fluid when drilling a formation known to have losses. The main challenge is to maintain a required PSD and concentration in the drilling fluid. This may be measured at the rigsite using wet sieve analysis or laser reflectance. Typical concentrations range from 12 to 20 lbm/bbl [35 to 57 kg/m3]. The method of treatment will depend on the length of interval to be drilled.
Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions described in the safety data sheet.
The OPTISEAL blends are packaged in 55-lbm [25-kg] multiwall paper sacks. Store in a dry, well-ventilated area. Keep container closed. Store away from incompatibles. Follow safe warehousing practices regarding palletizing, banding, shrink-wrapping, and stacking.