As its activity falls in high salinity water

the usual surfactant cannot be used for washing because of much salt

and increased surface tension and corrosion. It was reported in literature that some special surfactant can resist salinity up to 110000 mg·L-1 （alkaline earth metals up to 2500 mg·L-1）.A compound α-olefine polyether carboxylate whose range of resisting salinity up to 150000 mg·L-1 （alkaline earth metals up to 20000 mg·L-1）was introduced. Its washing and anti-corrosion effect in sea water was excellent. In the production of high-salinity heavy oil

it can reduce the viscosity of oil with formation water salinity as high as 150000 mg·L-1 （alkaline earth metals up to 20000 mg·L-1）from 100000 mPa·s (50℃) to 50 mPa·s (50℃).