Calcium Chloride Drilling Grade:
A highly soluble calcium salt of formula CaCl2 used to make drilling and workover fluids or brines with a density range from 8.33 to 11.6 lbm/gal [1.39 g/cm3] at saturation. Calcium Chloride Drilling Grade can be blended with other brines, including sodium chloride [NaCl], calcium bromide [CaBr2] and zinc bromide [ZnBr2]. Emulsification of CaCl2 brine as the internal phase of oil-base or synthetic-base mud is an important use because the brine provides osmotic wellbore stability while drilling water-sensitive shale zones.
pub-ltd CaCl2 additive can be adjusted to meet specific conditions and requirements. Mixes with low concentrations decrease slurry viscosity, while mixes with higher concentrations increase slurry viscosity.
Calcium Chloride is used in establishing and maintaining oil and gas wells. It helps well fluids gain needed consistency, increases density and stabilizes shale formations. As a completion fluid it seals well casings and displaces drilling mud. In short, Calcium Chloride is used in several applications for new or existing wells to improve efficiency and production. Calcium Chloride Prills are used in gas and oil drilling. It helps keep gases from forming and helps sludge from getting out of hand.
Calcium Chloride in Drilling Muds:
It used in drilling mud to cool and lubricate the bit and to remove cuttings from the hole. CaCl2 helps add density to the mud to overcome formation pressures and keep oil, gas, and water in place. Calcium Chloride inhibits clay and shale hydration, adds needed weight to overcome formation pressure, aids in carrying cuttings to the surface, and is easily diluted from more concentrated solution.
Calcium Chloride is used as a completion fluid just before the producing formation is reached to flush the hole clean of solids so the casing can be cemented into place. As a clear, solids free brine, Calcium Chloride is ideal as a completion fluid with a density range of 10 to 12 pounds per gallon.
As a pipe that runs from the reservoir to the surface, the casing is usually cemented into place to ensure a pressure tight connection to the oil and gas reservoir. The concrete also prevents caving, confines production to the well bore, and provides a way to control well pressure. CaCl2 cuts set time for concrete and can be used down-hole to several thousand feet.
Once the casing is cemented into place, the tubing, is inserted into the casing. Tubing makes the flow of oil or gas more efficient and can be replaced if plugs develop or damaged. Tubing is used with a packer fluid that keeps the well fluids away from casing to minimize stain. The tubing packer combination reduces well pressure on the casing and reduces the chance that a casing leak could become a blowout. It used in packing the annular space between tubing and casing. It helps maintain pressure levels because it has sufficient density to offset the pressure on the casing.
Calcium Chloride is used as work-over fluid, flushing wells free of solids before repairing or reworking a well that has been idle for some time.
CaCl2 additive is effective at temperatures between 40° and 120°F (4° and 49°C) in concentrations of 2% to 4% by weight of cement (bwoc), or equivalent liquid concentrations of 40 gal/100 sk (2%).