Analysis And Simulation Of The Front Edge Of Layered Waterflooding In Low Permeability Reservoirs

There are many low-permeability reservoirs and rich underground crude oil.However,mining is difficult to carry out and mining is extremely difficult.Under the current circumstances,many oilfields are using water injection technology for mining.However,in the process of daily water injection development,low-permeability water-flooding reservoirs have uneven water absorption between layers,and the water absorption of each water-injection layer does not match the amount of compounding.Problems such as low recovery rate during oil recovery.In order to solve these problems,most of the oilfield sites have adopted layered water injection technology measures.However,there are not many adjustments to the timing of adjustment of the working system of the injection wells,the matching of injection pressure and injection volume between the layers,the corresponding permeability difference limit in the case of adjustable injection well working system,and the different permeability of low permeability reservoirs.The variation of the water injection front edge of each sub-injection layer under the difference of the difference and the viscosity of different crude oils.Taking the Ordos Basin and Chang 6 strata as examples,the paper firstly investigates the reservoir distribution,permeability,high-pressure physical properties,phase infiltration characteristics and water injection,and clarifies the basic parameters of the reservoir,and is based on reservoir engineering,oil production engineering,The basic theoretical model of reservoir physics,oil and gas seepage mechanics and reservoir numerical simulation is established.Secondly,using the above data,ECLIPSE software is used for numerical simulation of water injection: the first step is to establish a general reservoir water injection and distribution based on an oilfield parameter.The water injection model is used to simulate the water injection development;the second step is to simulate the timing limit of the water injection work system of the injection well,and simulate the different water injection work systems under two measures;the third step is different in different permeability,different crude oil viscosity,different The water injection simulation is carried out under the injection pressure difference.Finally,combined with previous studies and basic theories,the paper analyzes the effects of general water injection and fine layered injection waterless oil recovery period and recovery rate,the timing of adjustment of injection well working system and the influence of different factors on the front of water injection.The research shows that the boundary of the water injection work system adjustment time is better when the difference between the upper and lower injection water front is 10 m.Influencing factors: the greater the pressure difference between injection and production,the smaller the viscosity of crude oil,the greater the propulsion speed of the reservoir water flooding front with relatively small permeability,the better the reservoir development effect,but it needs to be considered together with economic benefits;At the same time,the greater the difference in permeability,the harder the working system of the injection well is,and the level difference | K1/K2| ? 2.75 field technology is difficult to achieve.In summary,the analysis and evaluation made in this paper has certain theoretical and practical significance for fine layered water injection in low permeability reservoirs.