Research on Packers and Pipe Strings of Large Drift Diameter Fracturing;

Development of high duty five-cylinder plunger pump for oilfield fracturing;

Application of tip screening out and fracturing technology in transformation of low permeable reservoir;

Study on Determining Method of Sand Production Rate for Low Permability and Fractured Gas Well;

Analysis of pressure dynamic curve on fractured horizontal well;

Numerical test to the influence of hydraulic perforation parameter on fracture in oil and water wells;

Research on hydraulic fracturing technique of thin layer in old blocks of Henan oilfield;

. Applicability of hydraulic fracturing and acidization technologies to reservoirconditions;

Optimization and field application of hydraulic fracturing design of directional wells;

Thus,the base is formed for fracturing fracture extendly orientation prediction and proper well pattern modification of oilfield development, also provided theoritical basis for high efficient and reasonable developm.

The typical curves of multi-fracturing wells with dual media could be divided into 5 parts; such as linear flow section of fracturing fractures, early transition section, radial-flow section of fracturing in external area and channeling transition section between the external fractures and matrix and external pseudo-radial flow section.

The reason for ineffective fracture in Shanian area of Jiangsu oilfield was analysed.

The blockages can be removed in the fracture,which results in the recovery of diverting capacity,the enhancement of well productivity and great stimulation effect.