By doping Al 2O 3, the Al doped ZnO (ZAO) target with ultrahigh relative density(R D>99 0%) was obtained with pressureless sintering It was due to extremely high surface area of Al 2O 3 powder,uniform sintering of green compact and avoidance of big pore formation.

Considering the complicated situations such as uncertainly in strata pressure, high abnormal pressure coefficient, strata being easy to collapse, co-existence of well blowout and lost circulation etc, the article analyzes technical difficulties of drilling fluid with super high density, decides prescription of drilling fluid with density of over 2.

Design of ultra high density and high count 2000 optical fiber cable for easy branching;

Study on seismic prediction methods for super tight fractured reservoirs——An example from the exploration of Member 2 of Xujiahe Formation reservoir in Xinchang gas field,Sichuan Basin,China;