Testing and Simulating the Effect on Fracturing of Port Parameters of a Cemented Sliding Sleeve

In order to understand the effect of port parameters on fracture initiation pressure and fracture geometry, a fracturing test with φ168.3 mm cemented sliding sleeve that has different types of ports was conducted by theoretical and experimental studies. A ground test of cemented sliding-sleeve fracturing was carried out by use of full-size hydraulic fracturing simulation system, and the test result has been analyzed by using a finite element numerical simulation (FEM). The results show that fracture initiation pressure difference between slot-type port and wing-type port is smaller. The fracture initiation pressure rises with increase of the port angle. The length and quantity of the ports have a large effect on the fracture initiation pressure and the fracture initiation pressure decreases with increase of the port quantity and tube length. A test sample with a wing-type port and 0° slot-type port can form a single symmetric crack after fracturing, and the test sample of port with an angle can form a more complex one. The research results show that the port angle and tube length follow a quadric function relationship with the fracture initiation pressure, and the port quantity follows a linear relationship with the fracture initiation pressure. The results provide a basis and reference for optimizing the port parameters of φ168.3 mm cemented sliding-sleeve and other sleeves.