Study On Water Injection Develoment After Steam Soak In J Oilfield

Steam stimulation is an effective way to exploit heavy oil reservoir.Its principle is that high temperature and high pressure steam is first injected into the production well,and then shut in the well where the steam is injected,let the injected steam in the formation for effective diffusion,thus reducing the crude oil viscosity,to increase the oil effect.But with the gradual production,the formation pressure gradually decreased,at the same time near the wellbore temperature,formation oil saturation,permeability changes and other factors,the production volume,oil-steam ratio and other indexes of steam stimulation production wells will decrease accordingly.This paper evaluates the development effect of steam stimulation in the early stage and water injection in the late stage of Block J,In view of J oilfield's structural characteristics,reservoir characteristics,sedimentary facies,remaining oil distribution and water injection test effect,this study has launched research for fine structural interpretation,reservoir characteristics and sedimentary facies,remaining oil distribution law and water injection test effect evaluation.The geological model of J oilfield is established and the production history of the whole block and single well is fitted.The distribution of residual oil in J oilfield is simulated.Through dynamic monitoring analysis,dynamic boundary meshless reservoir engineering calculation and numerical simulation,the reservoir vertical and horizontal reserves production status is studied.By using the method of comparative analysis,different development modes after steam stimulation were studied,and the development effects after 15 years under the conditions of direct water flooding and water flooding after steam stimulation were simulated.Reasonable well pattern and well spacing were determined,and water injection parameters were optimized.The adjustment scheme of water flooding after Steam huff and puff in J oilfield is optimized.The conventional water flooding method is used for production with large accumulated oil production and good development effect.