Design Optimization Of Horizontal Wells Pattern In Fuyang Oil Layer With Low Permeability In The Peripheral Oilfields Of Daqing

Basing on the study of developing low permeability sandstone reservoir with the application of horizontal wells in domestic and abroad, combining the realities of developed blocks in the peripheral oilfields of Daqing, synthetical analyses the advantage using horizontal wells and the questions of horizontal wells pattern disposition in the low permeability reservoir now, the thesis designs optimization a kind of method of horizontal wells pattern disposition with low permeability in the peripheral oilfields of Daqing by using of reservoir engineering, numerical simulation, economic evaluation. The method designs different combinations of well pattern and reservoir parameters (fracture and sand body),which concludes the appropriate-matching of well array direction & fracture direction , injection-production well patterns of vertical wells& horizontal wells, flooding well spacing & horizontal wells length. Through different combinations, analyzes the predicted production velocity, cumulative production, water content, recovery percent and investment payback period, and internal earning rate, then gets the optimal matching of well array direction , pattern of spacing and density in fuyang oil layer with low permeability in the peripheral oilfields of Daqing.Optimise zhou201 block in fuyang oil layer with ultra- low permeability reservoir in zhaozhou oilfield as this studing test block by option rules of the adaptable block using horizontal wells in the peripheral oilfields of Daqing. Studies the feature of tectonic development, reservior development and fracture development by using relevant geological information, and builds triaxial geology modeling by PETREL software, basing on this design optimization studing for horizontal wells pattern parameters though numerical simulation & economic evaluation. The results show that this method is applicable to the peripheral low and super low permeability reservoir in Daqing oilfield and the effect is good.