Evaluation Research On The Feasibility Experiment Of Xinjiang Mo116 Well Area Water Injection Development

Mo-116 well area located in the south of MOBEI oilfield.According to the test data of the currently deployed appraisal well,it shows that oil and gas shows of Mo 116 well area is active,uses the water flooding.In order to obtain a better exploitation of Sanhegong formation in Mo 116 well area and a good effect of water flooding,it is necessary to research reservoir protection and water flooding technology in Mo 116 well area.By researching the evaluation of the reservoir damage,it can guide the development scientifically and improve the effect of water flooding.On the basis of geology and reservoir characteristics research of Mo-116 well area,this paper has carried out the reservoir sensitivity evaluation experiment,water injection feasibility experiment,injection water and formation water compatibility experiment.Through the research,the main conclusions are made as fllows.This reservoir belongs to low permeability and low porosity reservoir,pore structure is characterized by small throat radius,large pore diameter ratio,high saturation median pressure,low face rate and coordination number,fine pore throat distribution and low clay mineral content.In the reservoir the volume of water sensitivity,velocity sensitivity,sensitivity,alkali sensitivity and stress sensitivity is not serious,but acid sensitive mineral distributes imbalance in profile.Mobility ratio is no more than 1,By forecasting water flooding recovery factor is about 33.7%.The compatibility of the injection water and formation water is good,but the mechanical impurities in the water should take strict control.In the process of acidification and fracturing operation,make the residue return to the ground as far as possible,prevent the residue at the bottom of the well into the deep formation to prevent the secondary pollution of reservoir.In the entire development process of Mo-116 well area,it takes the method of injection-production synchronous development,adds the clay stabilizer in injection water Continuously and uses layered water-flood in injecting well which heterogeneity of formation is strong.The research results enriched reservoir damage and protection measures during water-flooding development of low-permeability water-sensitive reservoirs,and provided technical support for improving water injection development efficiency of the reservoir.At the same time it helps to better protect the reservoir in the process of water injection.