Yes, both polyanionic cellulose (PAC) and sodium carboxymethyl cellulose (CMC) can be used in oil and gas extraction processes.

PAC is a commonly used precipitating agent and suspending agent, which can be used in oil well cementing, cement slurry adjustment and drainage treatment. It can improve the stability of oil well cementing, improve cement slurry performance, and help control bottomhole flow.

CMC is a water-soluble polymer compound commonly used as thickener, gelling agent and emulsifier. In oil and gas extraction, CMC is used in drilling fluids, fracturing fluids and water flooding agents to adjust rheological properties, increase viscosity and improve the fluid's ability to carry solids.

Therefore, both PAC and CMC have wide applications in oil and gas extraction processes.