The role of PAC and CMC in oilfield is as follows:
1. The mud containing PAC and CMC can make the shaft wall form thin and strong filter cake with low permeability, so that the water loss is reduced;
2, after adding PAC and CMC in the mud, can make the drilling machine get low initial cutting force, make the mud is easy to release the gas wrapped in it, at the same time, the debris quickly abandoned in the mud pit;
3. Drilling mud, like other suspended dispersions, h...