Liquid Casing® Fine is a fine microcrystalline product processed to produce a seepage and loss circulation material that can be used in both water and oil based muds. The key feature of the product is the wide range of fine particle sizes. The sizes are approximately in the range of 1-500 microns with a median size of 60-170 microns. The wide particle size range ensures that all fractures or pore throats are sealed and the product can move through any configuration of drilling or coring string. It may be added to the mud or completion brine and used in the circulating system.
HOW IT WORKS
Liquid Casing® Fine is produced by a unique mechanical process. It is pressed into the pore spaces by the application of pressure to the calculated equivalent circulating density (ECD). The fluid loss function of a drilling fluid additive further enhances the seal that is formed. Migration of formation damaging fines from wellbore fluids is virtually eliminated. Reversal of the pressure, as when the well is brought on-stream, releases the filter-cake off easily due to the high-pressure gradient generated because of very limited filtrate invasion. This ensures rapid clean up and minimizes formation damage. The fine size and relatively large surface area can be exploited to provide a means for chemically removing the particles from the formation.
HELPS PREVENT DIFFERENTIAL STICKING
REDUCES WALL CAKE PERMEABILITY
SEALS OFF DEPLETED SANDS AND MICRO FRACTURES
PREVENTS SEEPAGE LOSS
COMPATIBLE IN WATER AND OIL BASED MUDS
HELPS LOGGING AND CASING RUN SMOOTHLY
BIODEGRADABLE AND NONTOXIC
TEMPERATURE STABLE 400+ °F (204 °C)
DOES NOT AFFECT RHEOLOGY OF THE MUD
REDUCES TORQUE AND DRAG
Use in whole mud system with 3-4 ppb concentration. If it is oil based or synthetic based mud it is recommended to use 5-6 ppb.
Use coarser shaker screens of no more than 100 mesh size. This will allow the product to remain in the system without passing through the shaker screens.
Optimum utilization of centrifuge is recommended. Due to its light weight (bulk density of 0.74), Liquid Casing® will remain in the center of the centrifuge and only a minimum amount of the product will go with the solid phase of centrifuge.
As this product is consumed in the well, to the external and internal filter cakes, periodical additions of product are required while drilling. A good rule of thumb is to add 2 sacks of Liquid Casing® Fine for every 100 ft. (or 30 m) to any new hole drilled.
Keep biocide in the entire system.
Spot a 50-100 bbl pill at bottom prior to tripping out. 50 bbl pill is sufficient for 8½” hole and a 75-100 bbl pill is required for 12¼” to 17½” holes.