Influence of Natural Fracture Occurrence on Hydraulic Fracturing Construction Pressure
The occurrence of natural fractures is an important parameter affecting the normal stress and tangential stress of the fracture wall,and the stress state of natural fractures is an important factor determining the magnitude of the ground construction pressure.Accurate calculation and prediction of the construction pressure plays an important role in hydraulic fracturing design and construction.According to the natural fracture occurrence and formation stress state,based on the criterion for fracture initiation and extension,a calculation model of the ground construction pressure is established.Using the actual fractured reservoir for calculation and analysis,it is found that:in normal fault and strike-slip fault,the smaller the dip angle is,the smaller the construction pressure is,and the smaller the construction pressure is when the azimuth angle is closer to 0°,180°,360° in normal fault,and the smaller the construction pressure is when the azimuth angle is closer to 90°,270° in strike-slip fault.In the reverse fault,when the azimuth angle is 0°～45°,135°～225°,315°～360°,the larger the inclination angle,the larger the construction pressure,when the azimuth angle is 45°～135°,225°～315°,the larger the inclination angle,the smaller the construction pressure,under the same inclination angle,when the azimuth angle is in the range of 0°～90°,180°～270°,the construction pressure is reduced with the increase of azimuth angle.For the same inclination angle,when the azimuth angle is within the range of 90°～180° and 270°～360°,the construction pressure increases with the increase of azimuth angle.Accurate calculation of the construction pressure according to the occurrence of natural fractures can provide a theoretical basis for the selection and optimization of field fracturing parameters.
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