ARTIFICIAL CONTROL TECHNIQUE OF VERTICAL EXTENSION OF FRACTURE IN HYDRAULIC FRACTURING

On the basis of analysis on the mechanism of artificial control of height of vertical ftacture,this paper presents a method to control artificially height of vertical fracture. By affixing suspending agent of low density solid and settling agent of high density solid when the fracture appers,we may increase the impendance and pseudoslide effect of vertical fracture end,produce man-made barrier layer,set a limit to extension of vertical fracture,prevent upper and lower water-layer from being penetrated,increase efficiency of fracturing fluid and fracture and effectiveness of hydaulic fractuing,lower cost of fracturing,and increase oil production. cacululations and analyses of practical examples show that the artificial control of vertical fracture is feasible by applying the method recommended in this poper.