Old conventional ideas should be given up while new ideas should be established:interference among wells is requirement of injection results;reducing well spacing will not affect unit well productivity ;reasonable well pattern and spacing depend on injection ability of a injector;well pattern controls "flow system" not "oil sand bank".

Study on horizontal well pattern in ultra-low permeability sandstone reservoir;

Application of artificial neural network to optimizing five-spot horizontal well patterns;

A new theory of the relationship between heating radius and well pattern during CSS process;

The anisotropy of reservoirs has destroying and reconstructing effects on the well networks.

The observational well network in Three Gorges acts as an important role in monitoring the induced earthquakes,but the running condition has not been well in recent years,the integrity and the validity of data have been lower.

As limited by reservoir and well network, development effect of low permeable Chaoyanggou oil field has gone worse with the prolonging of the developing time.

Based on the example in Min114 block at Xinmin oil field,the authors analyze the relation of the fracture and crustal stress,measure the direction and length of the hydraulic fracture by receiving the microseism signals when the terrene is broken,which provides a basis for deploying reasonable flood pattern for development of low permeability reservoir.

Oil production calculation for areal well pattern of low.permeability reservoir with non-Darcy seepage flow;

We have derived production capacity equation of combined distribution of horizontal and vertical wells,and compared the horizontal areal well pattern to its opposite vertical areal well pattern.