Experimental study on propagation mechanism of hydraulic fracture in naturally fractured reservoir;

Productivity calculation model of the hydraulic fracture wells with exploding in fracture front;

Mechanism of hydraulic fracture propagation in fracture-cavity carbonate reservoirs

This paper based on the low gas permeability coal seam 416 stope working face of Tongchuan mineral bureau,we analyzed the mechanism of the hydraulic cutting seam to improve the gas permeability coal seam,by this study,it shows the hydraulic cutting seam technology is effectual measure and it is provided with nicer practically and capacious foreground.

In this paper,we analyzed the mechanism of the high-pressure Abrasive hydraulic cutting seam technology in detail,introduced the research status quo of its technologic flow chart and correlative technology parameter and then expatiated the outbursts prevention effect of it in outbursts coal's fast head-cutting.

The testing research about enhancing permeability rate by hydraulic cutting seam on outsize coal sample is introduced.

Approximate modification method of welding stress determination by impact indentation strain method;

Stress analysis and strength study of hydraulic slotting casing;

Based on analyzing the "bottleneck effect" caused by the stress concentration around a drilling hole,the high-pressure jet current hydraulic slotting technology was the main method for pressure relief.