To change the limit of LPR test valve which need annulus pressure to keep static in opening period,a new model pressure controlled full bore testing valve which is applied for our oilfields' features is developed.

Spacer system is an important component of full bore perforating.

Full bore pressure detonator is one of key parts in full bore perforation system and its performance takes a vital role in obtaining operation result and may even endanger the security of perforation operation.

Data preprocess-ing is to treat these redundant information such as data purifying,user recognition,session recognition and pathway complement.

The damage radius,critical radius and safety radius of surface ship are computed with this method in accordance with several current evaluation criteria of damage grade in our country,some characteristics are discovered based on the result.

This paper states the principle of Live-working,on the basis of a numerical method to calculate the electric field intensity of EHV transmission line near tower ,combining the typical tower of double-circuit transmission line, part of Yifengjiayi Line, it analyzes the theoretical calculation and actual data of the electric field intensity, discusses the safe path of various k.