The successful foreign experience has confirmed that the penetration depth of a perforator can be enhanced by filling high pressure light gas.

In order to analyze parameters influencing the property of tungsten alloy liner,the orthogonal design was applied to the test of penetration depth.

Sensitivity,optical gain and current gain of a new model AlGaAs/GaAs punch-through phototransistor are measured.

Developed is a HSD89 perforator integrating high shot density and deep penetration together.

With the oilfield exploitation going into the stage of higher water-cut,in order to achieve the effective excavation of remaining oil in new step-out wells and local infilling wells,and fully develop the formation production,it is more and more important to develop and improve big diameter and deep penetration perforation completion technology.

The technology uses deep penetration perforation charge with high perforation density and large perforation diameter and surging perforation with greater pressure differential.

X-ray photograph analyses of jet flow produced by a perforating charge with big-hole and deep-penetration show that higher velocity of jet flow disc is beneficial to improve hole diameter and penetration depth of the charge.