Study On Factors And Optimization Of Proppant Conductivity

Tarim Kesi-Dabei deep gas reservoir belongs to an ultra-deep high temperature fractured giant sandstone reservoir.The reservoir depth is 6000~8023m,the formation pressure is 100~140MPa,the formation temperature is 130~180 ?,the reservoir thickness is >100m,the high-angle fractures is developed,costs of well construction is high,which is difficult to achieve effective economic productivity without effective hydraulic fracturing.The proppant used in the hydraulic fracturing process has a great influence on the hydraulic fracture conductivity,so it is necessary to optimize the fracturing proppant.In this study,Core-lab's FCS-842 fracture conductivity evaluation equipment was used to simulate the conditions of high-temperature and high-pressure reservoirs.The fracture surface is made by the full-diameter rock core.Experimental conditions are high temperature(140?)and high pressure(96MPa).The variables of research are proppant types,proppant particle size,particle size of combination,closure time,proppant concentration,fluid flow rate,fracturing fluid,and proppant placement.The experimental results show that the conductivity is relatively stable after supported fracture closure for 24 h,the conductivity of proppant with single particle size increases with the increase of proppant size,the conductivity of proppant with different particle diameters is affected by small particle size proppant,the broken fluid can led to supported fracture conductivity decreased by an average of 32%,under the condition that the closing pressure is less than 30 MPa,the conductivity of proppants with dynamic placement is larger than that of statical placement,and the maximum difference is 32.25%.The prediction model of proppant conductivity can accurately predict the conductivity of proppant combinations with different particle sizes,and the average forecast error is about 11%,which is based on experimental data.According to the principle of proppant selection,the reservoir characteristics and the actual construction conditions,it is recommended to use the proppant combination of 30/50 mesh,40/70 mesh ratio of 1: 1 for fracturing construction to obtain better effect.