Through Q235 hot rolling steel plate lamellar fracture macroscopic and microscopic observation analysis,as well as the steel plate microstructure,the non-metallic inclusions examination analysis,verification of the serious microstructure nonuniformity is the reason that causes the Q235 hot rolling steel plate lamination to roll over the crack.

Application of multifunction zonal fracturing switch to separate layer fracturing string;

Study and application of technologies for separate layer fracturing without pulling string in high pressure gas reservoir;

Difficulties of separate layer fracturing technology for low permeability gas reservoir and its countermeasures

The delamination crack in ferrite pipeline steel and the effect on the fracture;

The delamination crack and its effect on the fracture of pipeline steel were investigated by drop-weight tear test(DWTT)at different temperature and micrograph analysis.

The delamination crack has certain direction, and the number of the delamination crac.

The main objective of this study is to investigate the dynamic processes of the interlaminar fracture and micromechanisms of the glass woven fabric reinforced polycarbonate composites through in situ observation of specimen under mode Ⅰ loading by optical microscope.

This study is to investigate the dynamic processes of the interlaminar fracture and micromechanisms of the glass woven fabric reinforced polycarbonate composites through in-situ observation of specimen under mode I loading by SEM.

As for the reservoir characteristics in Tuha oilfield,by studying separate-layer fracturing technology strings,combining performance parameters of Y453 packer and matching tools at present,one-trip string for high pressure separate-layer fracturing,fluid discharge and well completion is developed and matched for Tuha oilfield.