, the invasion depth of mud filtrate is calculated, which established the ground for the calculation of th.

Basing on the mathematical model of predicating the drilling fluid concentration near the wellbore area according to the radical distance changes, and by the way of numerical integration, drilling fluid invasion depth and formation damage degree can then be determined.

The paper discusses the use of fiver hydrochemical indexes in evaluating the seawater intrusion, and ranking the intrusion degree for Cl -, M , Br -, r HCO 3/ r Cl and SAR .

By this method,the seawater intrusion degree can be classified according to the different ionic valence molar concentration percentage of eight ions in the total ionic valence molar concentration.

Based on conceptual design method,the experiment test and the simulation of the automobile\'s side frame components\' general intrusion velocity curve and B pillar deformation mode,three simplification intrusion velocity curves which loaded to the specific position of the B pillars were extracted,and then the B pillar/dummy simplification model was established.

The research results showed: In dry years and normal years, the extent of saltwater intrusion at South Branch and South Channel in Yangtze Estuary will become serious after the East Route Project and the Pumping Works;In rainy years, the water.