According to the geological conditions, actual engineering processes and laboratory results, the effects of emulsion plugging, produced by fluid_phase invasion of drilling mud, on the productivity of low_pressure and low_permeability reservoirs are analyzed, and some control measures are proposed, such as improv.

The causes of the of tailling transportion pipes blockage are described in a deep-going way,as well as effective measures and suggestions are put forwarded in order to reduce the pipe blockage.