Issue 49

O. Y. Smetannikov et alii, Frattura ed Integrità Strutturale, 49 (2019) 140-155; DOI: 10.3221/IGF-ESIS.49.16



 2

1 E E    

where  is the fracture liquid viscosity; q the rate of liquid pumping;

is the plane strain modulus of the

rock ( E —is Young’s modulus;  is Poisson ratio). As one might expect the FEM computations demonstrate the growth of tangential stresses   on the well walls with increase of the opening width of the primary HF. Fig. 2 presents the results of six calculations for different values of maximum fracture opening.

Figure 1 : Computational scheme for the problem of secondary oriented HF in rock formation.

Figure 2 : The incremental growth of incremental stresses   on the well walls depending on the value of the opening angle of the primary hydraulic fracture in the isotropic field of horizontal stresses ( H h    ) at different values of maximum opening w , mm: 3 (symbol ●); 5 (■);7,5 (  );10 (♦); 15 (  ); 20 (□).

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