M-I SWACO HDD Waterwell and Mining provides a full inventory of specially designed lost circulation materials that includes:
Cedar Fiber is a specially processed blend of fibers of controlled length, giving proper size distribution for regaining circulation. Cedar Fiber is non‐fermenting. Amounts used vary from 1% to 35% by volume
Mica is a selected, non‐abrasive mineral available in fine and coarse grades. Mica has no adverse effect on mud properties. It is used to prevent and regain lost returns. Fine mica can pass through a 20‐mesh screen.
Drilling paper is a blend of variable‐sized particles of ground paper that is applicable for use in all water‐base mud systems.
Drilling paper can be used in concentrations of up to 20 lb/bbl (57 kg/m3) in slug treatments or as an additive to the entire system. In areas of known lost‐circulation zones, it is advisable to pre‐treat the system before drilling into the zone of loss. Drilling paper can be mixed through the mud hopper or added directly to the pits and gunned into the mud.
The most important aspect of combating lost circulation is using the correct particle size. Consequently, it is recommended that a combination of materials be added to ensure a good particle‐size distributio
Cottonseed hulls are fibrous, biodegradable material that is an excellent bridging agent when large‐particle‐size material is needed. They can be used in any water‐base mud system.
Cottonseed hulls are used in concentrations of up to 20 lb/bbl (57 kg/m3) as slug treatments or as an additive to the entire system. In areas of known lost‐circulation zones, it is advisable to pre‐treat the system before drilling into the zone of loss.
FED‐SEAL lost‐circulation material is an engineered product that contains an optimum blend of granular, fibrous and flake materials. FED‐SEAL LCM is available in coarse, medium and fine grinds, covering a wide range of lost‐circulation problems.
FED‐SEAL additive normally is recommended in concentrations of 20‐30 lb/bbl (57‐86 kg/m3) mixed in a slug of 100‐200 bbl and spotted at the zone of loss, displacing the slurry at a reduced pumping rate with either large nozzles or an open‐ended system. FED‐SEAL LCM can be added to either the water‐base mud being used at the time of loss or in any special purpose slurry prepared for squeeze applications.
The FED‐SEAL product has been used for preventive measures or as a ʺfillerʺ because the fine grade can pass through 20‐mesh shaker screens.