New Pump-In Flowback Model Verification with In-Situ Strain Measurements and Numerical Simulation

This study presents an analytical model for estimating minimum horizontal stress in hydraulic fracturing stimulations. The conventional Diagnostic Fracture Injection Test (DFIT) is not practical ultra-tight formations, leading to the need pump-in/flowback tests. However, ambiguities results of these tests have limited their application. proposed based on linear diffusivity equation and material balance, which analytically solved verified using a commercially available numerical simulator. generates graph pressure drop its derivative are plotted versus developed solution time function. closure determined when slope deviates from linearity. was applied several cycles field flowback found eliminate ambiguity associated with identifying fracture closure. Furthermore, In-situ stresses estimated this approach via downhole strain measurement synthetic data fully 3D commercial technique outperformed other methods analyzing challenging injection/shut-in tests, showing improved reducing uncertainty parameters. expected scale down multiple trials provide reliable estimation stress.