The Natural Fracture Research On The Influence Of Permeability And Productivity In The Tight Sandstone Gas Reservoir

In the world's growing demand for energy and under the background of conventional oil and gas reserves' dwindling,unconventional oil and gas exploration and development is of great significance to relieve the pressure on the current energy situation.Tight sandstone gas,as one of the important unconventional oil and gas resources,whose distribution is wide and whose potential is tremendous,gradually become the research focus of attention.In Kuqa depression of Tarim oilfield widely distributed in deep tight sandstone gas reservoir,but existed natural fracture in sandstone.Mines found that natural fracture development had a great influence on reservoir capacity,but due to the complexity of the natural fracture development,and effects of cracks on capacity,crack before and after fracturing construction to increase production effect is still a difficult problem to be solved.Overall,the domestic and foreign scholars in fractured reservoir capacity model research have done a lot of work,but the hidden fracture chi capacity research is less.Now for fractured tight sandstone gas reservoir natural fracture,the factors impact on the capacity,the main control factors and fractured tight sandstone gas reservoir with natural fractures related to the main controlling factors to affect the capacity problem is still not clear.Field natural fracture after fracturing operation of fracturing construction effect is not clear.This article through studies in Kuqa depression of Tarim oilfield field contains 36 pieces of natural fracture seepage law of tight sandstone core to explore the effect of fracturing of natural fracture.This paper finds that the pressure arch effect decreases the sensitivity of permeability stress.The inclination(the degree of through)and the degree in filling of the natural fracture is the main factors affecting the permeability and production capacity.There are lower limited when the natural fracture conductivity promote the effect of fracturing stimulation.Fracturing is suitable for the acid mode with pressure,which don't pursue the dominant fracture conductivity,and should strivefor acid corrosion effect on the microfracture system reformation.The suggestion is that acid fracturing transformation should improve net pressure within cracks to stimulate more microfractures.