The Study On Asynchronous Injection Alternating Production For Multi-stage Fracturing Well In Tight Oil Reservoir

At present,the development of tight oil reservoir is often carried out by failure or conventional well pattern waterflooding,but the effect is not ideal.Therefore,how to determine the reasonable development method becomes the key to the efficient development of tight reservoirs in China.In this paper,based on the Lblock of Daqing Oilfield as the research object,integrated the reservoir engineering and the numerical simulation method,the study on the effective development of tight reservoir with asynchronous injection alternating production for multi-stage fracturing well is carried out.In this paper,based on the streamline method,according to the streamline morphology and the distribution of remaining oil saturation,the oil-water flow law and dynamic characteristics under d asynchronous injection alternating production schemes are compared and analyzed.The reservoir engineering and the numerical simulation method are comprehensive used to analyze the influence of different factors on the development effect by asynchronous injection alternating production,which include interwell distance,fracture half length,spacing,conductivity,bottom hole pressure,injection quantity,and close time.The results show that for fractured horizontal wells with a horizontal section length of 700m,the better scheme is the well spacing of 350m,fracture half length of 105m,fracture spacing of 70m and fracture conductivity of65×10^-3?m²?m,bottom hole pressure of 5 MPa,the cyclic waterflooding of 11000 m³,and close time of 35 days.Further,Compared with failure development,water injection huff-puff,and direct water flooding between fractures,asynchronous injection alternating production had the highest degree of recovery,which was 15.91%,and the degree of improvement were increased by 9.76%?5.73%?1.15%.The numerical simulation results show that the asynchronous injection alternating production is suitable for the development of tight reservoirs,which can improve the effect of waterflooding development and improve the degree of recovery.The work of this paper provides an important technical reserve for the effective development of tight reservoir.