The Study On Transportation Laws Of Slick-water Carrying Sand During The Fracture Of Hydraulic Fracturing

The high-efficiency development of unconventional energy sources such as shale gas and tight oil or gas has led to a major petroleum technology revolution,which trigger a worldwide upsurge of unconventional oil and gas development,thus promoting the oil industry from the conventional oil or gas era to the unconventional oil or gas era.And boosting this is nothing more than slickwater fracturing technology and horizontal well staged fracturing technology.Slickwater fracturing technology pump carrying sand at high flow rate and large amount of fluid,eventually,it can form in the unconventional reservoir with a certain proppant filled and fracturing fracture of bigger stimulated reservoir volume.But the fracture unfilled proppant will again close after turning off the pump,and become the invalid fracture.Obviously,study on the transportation laws of proppant in the fracturing fracture during slickwater fracturing to optimize the laying of proppant have a certain theoretical guiding significance.This paper fully research about transportation theory of proppant and existing research method at home and abroad,design and develop “the fracture and perforation simulation experiment system of hydraulic fracturing”,and relying on it research influential laws of different carrying sand fluid inlet position on slick water carrying sand transportation in the fracturing fracture,screen out inlet combination of the most beneficial to laying sand in the inlet end of fracturing fracture,and based on the optimal inlet position of the sensitivity analysis of the factors affecting slick water carrying sand,finally from the perspective of numerical simulation research solid-liquid two-phase flow laws of slick water carrying sand.The results show that the carrying sand liquid inlet position does not affect the equilibrium height and the laying process of proppant in the fracture during the slick water fracturing,and the sand forming process can be divided into 3 stages at different inlet position,but the time of each stage and equilibrium time has larger difference;The inlet position of carrying sand liquid through changing jet trajector in the fracturing fracture?coupling effect between jet and jet?collision strength between proppant particles?turbulent kinetic energy intensity achieve to affect settlement and transportation path of the proppant,then the laying morphology of the inlet sand embankment is changed;The inlet location of sand carrying liquid is the key factor that affects the shape of sand bank during slick-water fracturing.If only from proppant laying rate of the sand carrying liquid inlet end and the height of sand embankment balance front distance of two considerations,I-II hole combination is most conducive to fracture inlet laying sand,improving connectivity between wellbore and man-made fracture;The numerically simulated the formation process of sand embankment in the fracture during the slick water fracturing and the final sand embankment morphology at different inlet position are consistent with experimental results.It is proved that the numerical model is practical and effective;The end of slick water fracturing construction can through reducing the pumping flow rate,with the increase of sand ratio,proppant density and particle size to increase the quantity of proppant placement at the inlet end.