Evaluation And Protection Measures Of Low Permeability Reservoir Damage

Our country is rich in resources of low permeable reservoir, and with the distribution of awide range. With further exploration and development of low permeable oilfield, yield ratioincreased year by year, but the parameter of that is much worse, it’s easy to cause formationdamage during the exploration and exploit. If the damage happens, it can’t easy to resume andhave a deep effect on the productivity, and the severity can make the well production stoppedor discarded. The study of the damage mechanism of low permeable reservoir and how toquick and accurate predict the damage are very important. Although the basic reasons offormation damage have been profoundly understood, due to differences in geologicalcharacteristic and formation condition and so on, detailed analysis of each oilfield should becarried out.In this paper, made chang6reservoir as the major study-target of the main oil-bearingseries in the yongning oilfield, through the analysis of its geological characteristics andproperties, analyzes the potential reservoir damage source, and through sensitivityexperiments, qualitative analysis of damage mechanism, through the study of regional trueskin factor, formation damage radius, the quantitative determination of the region the extentof the damage, and based on the qualitative and quantitative analysis results, formulatespecific measures in Yongning Chang6reservoir to prevent damage, the damage was mostsevere perforating formulate optimization scheme, to provide technical support for improvingthe productivity of study area.This paper mainly get the following results:(1) through the study of reservoir geologyand reservoir property, analyzes the potential hazards cause reservoir damage;(2) theexperimental evaluation of the sensitivity, the sensitivity degree of reservoir, and puts forwardcorresponding suggestions for reservoir protection;(3)through the evaluation of the skinfactor) field method, decomposition of skin coefficient, calculated for each factor level ofdamage, and formulate corresponding measures of protection;(4) preferred the perforationtechnology suitable for geologic characters of researching area, and to evaluate the reservoir transformation effect the fracturing through calculation and analysis, provide a usefulsuggestions for the development of Yongning area of low permeability reservoir.