Study On Frictional Sliding Characteristics Of Shale Reservoir Joints

Hydraulic fracturing is common in shale gas development stimulation.Since shale reservoirs of natural fissures in the fracturing fluid will partially fracturing fluid is pumped into the pre-existing natural fractures,inner seam net pressure increase,the activation of natural fractures,prompting its sliding friction.In recent years,more and more researchers began to focus on the natural seam surface friction sliding effect of hydraulic fracturing effect,but on the seam side sliding friction characteristics and opens the slippery conditions are not many studies.This paper investigates the first researches on the seam shear slippage,and analyzes the factors that influence the outcomes of the research have now sewn surface frictional properties,mechanical model of sliding friction and conductivity after fracture,based on the final friction slip microscopic characteristics shift this purpose on the influencing factors were collated and analyzed in order to carry out the tests developed an experimental apparatus,and formed a set of experimental methods,and finally the establishment of a micro-friction characteristics to facilitate research on the basis of the existing mechanical model mechanical model.The results show that the sliding friction factors shales mainly of quartz and clay mineral composition,sewing surface water status,effective normal stress;opens the slippery conditions by mineral content and surface micro projections stiffness control;infiltration of water and slippery after water can be reduced to some extent,start sliding friction conditions,the degree of reduction in both little difference;an inverse correlation between permeability and opens the slippery conditions after sliding friction.Finally,Shenhua to be evaluated for the development of shale gas blocks fractured reservoirs natural frictional sliding potential.