Study on proppant optimization in tight sandstone reservoirs:A case study of Shenfu block in Linxing
In order to reduce the cost of hydraulic fracturing to transform tight sandstone reservoirs and better release the reservoir pro-ductivity in Linxing Shenfu block,firstly,the HXDL-2C proppant long-term flow conductivity evaluation system was used to carry out the proppant flow conductivity capacity evaluation experiment,mainly studying the effects of closing pressure,sand laying concentration,quartz sand particle size and different particle size combinations,and the combination ratio of quartz sand and ceramic particle on the proppant fracture flow conductivity capacity.Then combining with the principles of proppant optimization proposed in the article and nu-merical simulation research,the proppant optimization work during fracturing construction of the Tai-2 reservoir in Linxing Shenfu block was guided.The results show that the increase in closing pressure will lead to a decrease in the flow conductivity capacity of the prop-pant.When the closing pressure is constant,the flow conductivity capacity increases with the increase of sand concentration.The flow conductivity capacity decreases with the increase of the proportion of small particle size proppants in different combinations of proppa-nts.The combination of quartz sand and ceramic support agent increases the flow conductivity capacity with the increase of the propor-tion of ceramic particles.On the basis of the above research,a combination ratio of quartz sand(20/40 mesh)and ceramic particles(20/40 mesh)with a ratio of 1∶1 was selected.Under the condition of a sand spreading concentration of 4 kg/m2,the production in-crease effect of fracturing construction in the Tai-2 reservoir was better.
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