Numerical study on the impact of water-rock interactions on the propagation of water-flooding induced fracture

Introcution: Water-flooding is an effective way to develop the extra-low permeability oil reservoirs and water-flooding induced fracture (WIF) can improve waterflooding efficiency. However, geomechanical properties of rocks may alter due water-rock interactions, which usually increases heterogeneity reservoir affects WIF propagation. Methods: In this study, a method calculate propagation length was proposed numerical models were established considering effect interactions on properties. addition, model stress distribution validated by theoretical solutions based mechanics. Moreover, mechanism analyzed. Results: Results indicate that valid with error under 5%. be affected several factors, including injection pressure, damage variable initial length. Noteworthy, pressure should strictly controlled because highly sensitive pressure. An increase 2 MPa in result 90 m length, accounting for 64% case studied work. Discussion: aggravate promote alteration such as Young’s modulus. Therefore, propagate even if less than minimum horizontal stress. Furthermore, intensity factor ( K IA ) lead sudden water flux reduce efficiency waterflooding.