Polyanionic cellulose (PAC) is a white or yellowish powder, non-toxic, odorless, soluble in water, good thermal stability and salt tolerance, antimicrobial resistance, is a water-soluble ionic fiber cellulose ethers, mainly for land and offshore oil drilling mud additives, with good salt tolerance, drilling mud is an important and efficient treatment agent. The product is formulated with a good drop of mud fluid loss, inhibition of high temperature resistance. Widely used in oil drilling, especially salt water wells and offshore oil drilling.
PAC applied to the pure water to saturated brine from any mud. Low viscosity type PAC can effectively reduce the amount of fluid loss, and does not significantly increase the viscosity of the system, especially the high solid content system; high viscosity type PAC mud volume, fluid loss effect is obvious, especially for low solid mud and no solid with saline mud.
Mud fluid formulated with PAC can inhibit dispersion and clay and shale swelling in high salt medium, so that the wall pollution control. Because PAC response uniformity, replace high transparency, salt and heat performance, measured by OCMA standard had a higher amount of mud (PAC-HV) and low fluid loss of water (PAC-LV) .
PAC workover fluid formulated with low solid phase, without blocking the production level of penetration; production layer can protect against permanent damage; clean with a carrying capacity of the wellbore, the wellbore and reduce maintenance workload; has the ability to resist water and sediment infiltration and rarely blistering; can be stored or transferred between the wells and wells with lower than average cost workover fluid mud.
The ability of the fracturing fluid prepared by PAC 2% potassium chloride solution (to be added to the preparation of the fracturing fluid), and the dissolution of good performance; easy to use, can be site preparation; gelation speed, carrying sand and strong ability; at low osmolarity formations using its fracturing effect is more remarkable