Research On Compatibility Influence Factors Of Injection Water With Reservoir On Low Permeability Oilfield

With the growing demand for oil and gas resources in our country,low permeability oil and gas resources has become one of the key point of oil and gas exploration and development in our country.Water flooding is still the main approach to develop low permeability reservoir.Due to the poor physical property and low productivity of low permeability reservoir.In the process of water flooding,injection water with reservoir is not compatible can extremely easy to cause the damage of reservoir.These damages can often be irreversible,cause productivity drops rapidly,shorten the development cycle of oilfield.Eventually lead to recovery efficiency decreased,influence the economic development efficiency of reservoir.The compatibility of injection water with low permeability reservoir starring on reservoir characteristics,but it has little research of the study on the influence factors of mineral ions,reservoir properties of crude oil,reservoir rock mineral composition and content in injection water.The research of reservoir sensitivity is also the same.So it is necessary to carry out the research under different influencing factors of compatibility of injection water with low permeability reservoir.Also clear the influence law of it under different factors.Provide the basis for the property and standard of injection water and its development plan design of low permeability reservoir.Based on information at home and abroad on the basis of the investigation.This paper summarizes the reservoir characteristics of low permeability reservoir,potential damage factors and oi filed injection water environment of reservoir damage mechanism.Based on the research of C9 HH oilfield reservoir.By changing the scaled ion content of injection water,Injected water with formation water mixing proportion and temperature.Test compatibility of injected water and reservoir oil.By changing the mineral composition and content of reservoir rocks and the nature of the injection water.Test compatibility of injection water and reservoir rocks.Clear each factor that may influence injection water with reservoir fluid and compatibility of rocks.Through research,we get the understanding of the following several aspects:(1)Scale ions of SO42,Mg2+,Ca2+ in the injection water,permeability level of the reservoir,water type,mix ratio of injection water with formation water,temperature and injection time are main influencing factors of compatibility of injection water with formation water.(2)Injection water pH and surface active substance of it are main influencing factors of the compatibility of injection water with crude oil.(3)Clay mineral content in the filler content reservoir,the content of montmorillonite of the clay minerals,Interstratified illite-montmorillonite minerals,kaolinite and illite,salinity,type and injection time of injection water are main influencing factors of compatibility of injection water with reservoir rock.In this paper,based on the theory.Through the experiment research.Starting from the low permeability reservoir injection water compatibility.Has been clear about the injection water with formation water,crude oil reservoir and the reservoir rock compatibility influence factors and influence degree.provide theoretical basis for the theoretical research of oilfield water flooding development and injection water quality indicators for the future.