Based on the theory analysis,the reason was discovered of oil- blocking during the operation of a gear oil pump,which resulted in power loss,vibration and noise.

The resolution of evaluation results is sometimes low when using the present gray association analysis to evaluate the geological models of lithology,physical properties,oil potential and oil-bearing area.

In the process of reserve calculation using volumetric method, to confirm oil-bearing area is in fact to calculate polygon area.

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.