Coupled Geomechanical Analysis of Parent-Child Well Interactions Using SWPM

Field evidence consistently shows that hydraulic fractures initiated from newly drilled child wells preferentially propagate toward existing parent wells. This asymmetric behavior arises from depletion induced pore pressure sinks and stress redistribution around the parent well, which locally reduces the reservoir stresses and creates stress anisotropy. The resulting attraction of child fractures toward depleted zones often manifests as “frac-hits” - mechanical interference and pressure communication events that can compromise parent well integrity, alter fluid distribution, and reduce overall recovery efficiency.
 
This study presents a fully integrated modeling workflow that couples three-dimensional hydraulic fracturing simulation with geomechanical stress evolution and reservoir flow modeling, augmented by Sealed Wellbore Pressure Monitoring (SWPM) diagnostics. The framework enables dynamic calibration of fracture propagation by correlating simulated fracture growth with observed pressure responses in nearby monitoring wells. SWPM provides precise identification of fracture arrivals through real-time pressure change monitoring, facilitating quantification of cluster efficiency, and stage-to-stage fluid distribution. The integrated workflow captures the complete life cycle of parent and child well simulation - from initial fracture creation and depletion-induced stress change to subsequent stress shadowing-controlled propagation.
 
Simulation results demonstrate that reservoir depletion in the parent well leads to anisotropic stress redistribution, reducing local stresses and creating preferential reduced stress zones that attract fracture growth from the adjacent child well. This depletion-induced stress relaxation results in asymmetric fracture propagation and elevated risk of inter-well hydraulic communication. By coupling the 3D hydraulic fracturing simulator with SWPM diagnostics, the study quantitatively constrains fracture half-lengths, height containment, and cluster efficiency, allowing for dynamic calibration of the geomechanical model. Benchmarking of model predictions against SWPM derived Volume to First Response (VFR) and fracture growth signatures demonstrate strong agreement with field observations, confirming the model’s capability to capture asymmetric propagation and vertical containment behavior, multi-stage fracture growth, inter well interactions, and staggered well configurations. SWPM-calibrated simulations further confirm that parent-well re-pressurization, optimized landing depths, and staggered well configurations effectively restore local stress balance, limit fracture coalescence, and enhance vertical containment.
 
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