关键词: 水力压裂, 排量, 黏度, 破裂压力, 裂缝, 低黏滑溜水

Abstract: The analysis on the influencing factors of reservoir stimulation has always made reference to experience and theory. Although there were some small-scale rock sample experiments occasionally conducted, the results obtained cannot reflect the actual conditions of reservoir stimulation. In order to discover the influence law of construction parameters on the reservoir stimulation, large-sized experimental samples were prepared with reference to the rock mechanics parameters of typical high-stress reservoirs in Shunbei Oilfield, three-dimensional hydraulic fracturing experiments were conducted with a hydraulic fracturing physical modeling system, and the effects of pumping displacement and liquid viscosity on hydraulic fracturing and the relationship between acoustic emission amplitude and pumping pressure were studied. The results showed that with the increase in initial pumping displacement, the fracture pressure required for reservoir stimulation was gradually increased; after reaching a certain value, the displacement had little effect on the fracture pressure; the pumping displacement had an effect on the fracture size at the moment of fracturing, but had little effect on the entire fracturing process; the application of low-viscosity slick water at the beginning of stimulation could significantly reduce the net fracture pressure, in favor of reducing the construction pressure; the amplitude of acoustic emission was positively correlated with the net pumping pressure, and the greater the net pressure at the moment of fracturing, the greater the amplitude. The study results provide a reference for the design of fracturing construction parameters optimization for ultra deep well fracturing under high stress.

Key words: hydraulic fracturing, displacement, viscosity, fracture pressure, fracture, low-viscosity slick water