Optimization of well killing method for high pressure gas wells;

Application examples of gas logging parameters combined with drilling time in the well control of the high pressure gas well.;

Thread sealing property in high temperature and high pressure gas wells is more important than that in oil wells.

In order to study high pressure gas quenching process completely and exactly,the numerical model was established by use of the finite volume method to coupled compute gas velocity,temperature field of gas and workpiece and phase transformation inside workpiece during high pressure gas quenching process.

low pressure vacuum carburizing and high pressure gas quenching,was adopted to ring gear of motors.

This article analyzes some main factors that decide the effect of high pressure gas quenching, introduces the development of international and domestic studies on high pressure gas quenching vacuum furnaces, and points out the major problems and the developing trend of domestic furnaces.

Development of PN40 DN32 pilot operated high pressure air electromagnetic valve;

According to the four problems about high pressure gas transportation such as the too much blanking of PTA powder,the PTA powder falling not smooth,the fluidized bed clogging and pressure high position alarm not appearance in high pressure transpotration tank,frequently appears in the polyester production,the new and convenient operation method has been proposed.