It can increase more efficiently the drainage area,through which the oil flows to the well from reservoir better than routine perforation,and so increase the productivity of the well.

Taking the uniform distributed rate as object function, numerical simulation was made for optimizing the injection distribution system and discharge area of the pipe.

Reservoir engineering method is adopted to calculate recovery indexes such as the horizontal well's limited recovery factors, well drainage area, reservoir limited recoverable reserves and water cut an.

Compared with vertical wells,horizontal wells has the advantages of shortening distance between wells,extending well drainage area,increasing critical coning flux,controlling the injection fluid and improving oil displacement efficiency.

According to these three methods, the relief calculation system of dust explosion developed with Visual C++ and how to calculate the relief area in the system were introduced.

And the general calculation methods to calculate the relief area of dust explosion in closed vessels and buildings were concluded and summarized, and a visible application: Relief Calculation System of Dust Explosion, was developed by using VB.

By using the model of bounded explosion,the maximum explosion pressure of the gas supply house with explosive pressure relief area is discussed in detail.

Based on these,the explosion venting area are calculated by using methods of K_(?t) and S_t formula in fixed dimenstion equipment,elevator and hop-pocket dust catcher in Canada imported wheat transportation.