CMC is a water-soluble polymer that can be used to control the rheology and viscosity of drilling fluids, as well as to improve their fluid loss and filtration properties.
The oil drilling grade CMC is specifically designed and formulated for use in drilling fluids and has a number of properties that make it suitable for this application, including:
High purity: Oil drilling grade CMC is highly pure and free from contaminants, which ensures its consistency and reliability in drilling operations.
Good solubility: Oil drilling grade CMC has good solubility in water, which allows it to be easily mixed with other drilling fluid components and dispersed uniformly throughout the fluid.
High viscosity: Oil drilling grade CMC can form a highly viscous solution in water, which helps to control the rheology and viscosity of drilling fluids and prevent the loss of fluid during drilling operations.
Good filtration control: Oil drilling grade CMC can help to control the filtration properties of drilling fluids by forming a filter cake on the wellbore that can help to prevent the loss of fluid and maintain wellbore stability.
Oil drilling grade Carboxymethyl Cellulose (CMC) is typically added to drilling fluids as a dry powder or in a pre-hydrated form. Here are the general steps for using oil drilling grade CMC in drilling fluids:
Determine the appropriate dosage: The dosage of oil drilling grade CMC will depend on the specific application, the properties of the drilling fluid, and the desired rheology and filtration properties. The manufacturer's instructions and technical data sheets should be consulted to determine the appropriate dosage.
Pre-hydrate the CMC: If the oil drilling grade CMC is in a powder form, it will need to be pre-hydrated before it can be added to the drilling fluid. This can be done by mixing the CMC with clean, fresh water and allowing it to hydrate for a specified period of time, according to the manufacturer's instructions.
Add the CMC to the drilling fluid: Once the CMC is hydrated, it can be added to the drilling fluid slowly and continuously while the fluid is being mixed. The mixing process should be done according to the manufacturer's instructions to ensure that the CMC is evenly dispersed throughout the fluid.
Allow the drilling fluid to circulate: Once the CMC is added, the drilling fluid should be allowed to circulate for a period of time to ensure that the CMC is fully activated and the desired rheological and filtration properties are achieved.
Monitor and adjust: The drilling fluid should be monitored and adjusted as needed to ensure that the desired properties are maintained throughout the drilling operation. The dosage of CMC may need to be adjusted based on changes in drilling conditions and properties.