Optimization Design of Horizontal Wells in Low Permeability Reservoirs of Block Pu 47

The low permeability reservoirs of Block Pu 47 of Putaohua Oilfield have the characteristics of poor physical properties and large permeable resistance.Therefore,during production,there exists a pressure gradient and liquid productivity and oil productivity drop suddenly.In order to solve the problems above,the production technologies of horizontal wells are optimized for the reservoirs.At first,the region applicable for horizontal well arrangement is selected based on the conditions applicable for horizontal well;and at second,horizontal section extension direction,horizontal section length,horizontal well pattern and well space are numerically simulated and therefore rational parameters of horizontal wells are calculated based on the geology models of Block Pu 47.Field application shows that the development of low permeability reservoirs with horizontal wells can increase individual well productivity,enhance oil recovery and lower cost.The study on the technology is significant to the development of similar reservoirs.