Optimization Of Water Injection Huff-n-puff Imbibition Technology In Tight Oil

Researchers in the field of unconventional oil attach greater importance to exploration and development of tight oil globally.Yet,efficient exploration in the domestic tight reservoirs would become a tricky subject for suffering high risk,high energy consumption and low recovery,since the fractured reservoirs under low pressure would exposure to growing splits.In this paper,based on the research on the volumetric fracturing water injection and puffing of ultra-low permeability tight reservoirs at home and abroad,and the optimization method of infiltration and oil recovery technology policy,the dynamic analysis method is firstly used to inject water wells in the An 83 Chang 7 tight oil area of Changqing Oilfield.As an example,the typical problems and causes of the differences in water injection and throughput in directional wells and horizontal wells are analyzed,and the main controlling factors affecting the effect of water injection and throughput are summarized.Then according to the effect of the throughput test,the main reasons for restricting the seepage efficiency are analyzed.The physical and mathematical models of oil-water two-phase seepage considering the sorption effect are established.Based on this,the water injection amount,injection speed and boring time are determined.Sensitivity was analyzed.Afterwards,based on the well location and average geological parameters of the water injection development well area in the A83 pilot test area of Changqing Oilfield,the numerical model of the seepage and recovery of horizontal wells and directional wells was established respectively,on the basis of which the influence of water injection and absorption was absorbed.Several main process parameters of oil production development: optimization of throughput timing,throughput and smoldering time.Finally,the work area model of the An 83 pilot experimental area was established,the history of the pilot experimental area was fitted,the optimization results of the seepage and oil recovery technology policy were applied to the experimental design,and the overall water injection and throughput plan design and production were carried out in the pilot test area.The prediction indicates the superiority of the application results of the water injection and stimulation oil absorption technology policy to the development plan,and provides reasonable and powerful guidance for the efficient development of ultra-low permeability tight reservoirs.