Early water breakthrough and fast and complex watered out are the current situations of this block.

This paper briefly discusses the definition, genesis end classification, proposes the concept of waterflooding oil water interface, indicates that the raising of this interface to the top of the reservoir makes the oil well watered out and stop production in the reservoir, and confirms the mechanism that microstructures influence oil well production.

Underwater photosynthesis of the riparian plants Salix variegata Franch.and Arundinella anomala Steud.in Three Gorges reservoir region as affected by simulated flooding;

The effects of flooding on survival and recovery growth of the riparian plant Salix variegata Franch.in Three Gorges reservoir region;

Effect of Flooding on Adventitious Root Formation of Arundinella anomala Steud. and Salix variegata Franch.;

The former one is area with abundant remaining oil and the second one is poor petroliferous area or easy water-out area.

A method is proposed for qualitatively diagnosing water-out zones, which is simple with less calculation.

Reservoir is inevitablely associated with water-out after water flooding development.

This paper presents the experiential study on casingcutting with abrasive water jet under conditions of nonsubmergence, submergence and ambient pressure.

The synthetic control of large scale collapse of preparatory workings after submergence in Chengchao Iron Mine;