Experimental study on fracture propagation morphology of deviated well in tight reservoir

The highly efficient production method of tight reservoir in complex fault block reservoir is large slope cluster well volume fracturing. The characteristics of fracture initiation and propagation in deviated Wells of tight reservoirs under different stress states and well trajectory parameters have not been clarified yet. Based on the laboratory physical simulation test of true triaxial hydraulic fracturing, this paper studies the law of fracture propagation caused by various factors such as horizontal stress difference, well inclination Angle and azimuth Angle. The experimental results show that under low horizontal stress difference coefficient, spiral perforation is beneficial to the initiation of multi-hole fracture, but the fracture near the wellbore is seriously distorted. Directional perforation under high horizontal stress difference coefficient is favorable for hole initiation, forming complex fractures dominated by single smooth fractures and supplemented by secondary fractures. 20° or 80° well oblique fracture is smooth fracture, fracture surface distortion degree is small, perforation orifice initiation point is less; When the inclination Angle is 40° and 60°, the perforating hole has more fracture initiation points, high fracture extension pressure and high fracture plane distortion. When the azimuth Angle is less than 80°, it is beneficial to add sand on site.