| Unconsolidated sandstone reservoirs are widely distributed in China ’s offshore andonshore oil fields, to achieve cost-effective development is of great significance to improveour oilfield production and ensure the safety of China’s energy, In recent exploration, there aresome blocks of unconsolidated sand reservoir due to its high shale content, reservoirpermeability is usually less than50×10-3μm2, the oil recovery rate is very low, fracturingstimulation is an effective means for the liberation of its low permeability reserves, and theability to produce flat fracturing is the key to increase per well production,so fracturingmechanism of basic research is particularly important.This study exploring the large size simulation of unconsolidated sandstone rock samplesproduction methods by the principle of similarity, firstly attempting to use the the triaxialstress control system to suppress rock samples, by Preparating the large size of simulationmuddy unconsolidated sandstone rock samples and carrying out the true triaxial simulation offracturing experiments, verifying that low permeability muddy unconsolidated sandstonethat’s available fracturing and visually observe the initiation and extension morphological offracture, Analysis the impact of fracturing fluid type, confining pressure and rockpermeability for fracture initiation and extending pressure and fracture morphology.This article consider the impact of hydraulic flushing based on the classic cracktwo-dimensional model, improve mathematical model of cracks, fix slit width of cracksformula and deduce fracturing fracture length and slit width calculation model. Analysis thesensitivity of the fracturing extension affecting factors, investigating various parameterchanges on the loose sandstone crack propagation characteristics, This research provides thebasis for optimization muddy unconsolidated sand reservoir of hydraulic fracturing design,thereby improving the fracturing stimulation effect. |
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