Study On Damage Mechanism And Reservoir Protection Technology Of Water Injection In Weibei Long 3 Low Permeability Reservoir

Along with our country’s growing demand for oil and gas resources,low permeability oil and gas resources have become the focus of China’s oil and gas exploration and develop-ment.Due to the low permeability reservoir properties poor, low productivity in the develop-ment process susceptible to damage, which on all aspects of the oil and gas have made high demands.Therefore, to take effective measures to protect the reservoir during low water per-meability reservoir development has great significance for the normal oil production.Based on the domestic and international data on the full investigation, summarized the mechanism of the process of reservoir water flooding damage, and chang3reservoir of Weibei as the research object, through the reservoir core porosity and permeability tests con-ducted analysis, clay mineral analysis, scanning electron microscopy (SEM), mercury analy-sis, the physical parameters of the reservoir and the potential damage factors.And the use of injected water and formation water ionic composition analysis, the scale of the reservoir is forecasted. According to the reservoir sensitivity experiment results indicate that the main damage type of the reservoir are:water sensitivity damage, damage to salt sensitivity and stress sensitivity damage.In this paper, Through the experimental evaluation of core permeability damage for wa-ter quality, the injection concentration of the suspended particles in the water, suspended par-ticle size and the oil content of reservoir damage mechanism and the regularity was summa-rized and analyzed. At the same time, using Design-Expert software to evaluate the relevance of each index, and according to the water quality of core damage orthogonal experimental re-sults obtained Weibei long three reservoir water quality of the recommended indica-tors.Introduces the suspended particles clog internal reservoir model and the experimental da-ta were fitted by determining the parameters of the model, get ultra-low permeability reser-voirs under the experimental conditions within the particles clogging the regression model, and the resulting simulation curve and the actual curve fit good condition.Comprehensive clay expansion agent, the type and concentration of the inhibitor of the experimental results and the effect of the preferred evaluation of experimental data, combined with the core permeability damage for water quality evaluation test results to make a compre-hensive water injection scheme for chang3reservoir of Weibei, and provide reference for water injection development of weihe oilfield.