Polyanionic cellulose (PAC) is white or yellowish powder, non-toxic, odorless, soluble in water, has good heat stability and salt resistance, strong antibacterial activity, is a water-soluble ionic fiber It is mainly used as land and sea oil drilling mud additive and has good salt resistance performance. It is an important high-efficiency treatment agent in drilling mud. The mud fluid formulated by the product has good water loss, inhibition, and high temperature resistance. Widely used in oil drilling, especially brine wells and offshore oil drilling.
PAC is suitable for any slurry from pure water to saturated brine. Low-viscosity PAC can effectively reduce the amount of fluid loss, and does not significantly increase the viscosity of the system, especially for high solid content systems. High-viscosity PAC has a high slurry yield and a significant drop in filtration. It is particularly suitable for low-solids and non-solids. Phase salt slurry.
Slurry fluids formulated with PAC can inhibit the dispersion and expansion of clay and shale in high-salt media, thereby allowing well wall contamination to be controlled. Due to the good homogeneity of the PAC reaction, high degree of substitution, good transparency, and excellent salt and heat resistance, higher pulp production (PAC-HV) and lower filtrate loss (PAC-LV) were measured by the OCMA standard. .
Workover fluids formulated with PAC are low solids and do not block the permeability of the production layer; they can protect the production layer from permanent damage; have the ability to clean the wellbore and reduce the amount of work required to maintain the wellbore; Has the ability to resist the infiltration of water and sediment, and rarely blisters; can be stored or transferred between wells and wells, and is less costly than general mud workover fluids.
The fracturing fluid formulated with PAC can resist 2% potassium chloride solution (must be added when preparing fracturing fluid), and has good solubility; it can be easily prepared and used for on-site preparation; the gelation speed is fast and the sand carrying capacity is strong; the low osmotic pressure Used in the formation, the fracturing effect is even better.