Analysis of Simulation Characteristics of Hydraulic Fracturing Potential Monitoring Method Based on OC-RPIM

In the process of hydraulic fracturing monitoring, the signal characteristics can reflect the state of fracture propogation. Therefore, based on the potential monitoring method and the forward simulation algorithm, the signal characteristics of the vertical well’s hydraulic fracture were simulated and analyzed. In order to improve the stability and accuracy of the forward model, first, for the two-dimensional electric field equation, the overall shape parameter C radial base point interpolation method (OC-RPIM) that could adaptively adjust the shape parameter was adopted, avoiding errors caused by using an unreasonable shape parameter. Second, the normal ideal conductor interface equivalent method was used to simplify the hydraulic fracture modeling process and enhance the computational stability in this multi-scale problem. The forward modeling results show that the change rate of the potential signal on well bore gradually decreases as the fracture half-lenght increases. Under the condition that the conductivity of the formation does not change much, it is recommended to use remote well bore potential monitoring to expand the detection range of the fracture half-length. In addition, when the conductivity contrast between the formation and the fracture filler is high, the well bore potential signal has a stronger correlation with the fracture half-length. This phenomenon can effectively weaken the influence of other factors on the borehole signal. The research results provide theoretical support for the interpretation of the fracturing potential,monitoring signals and an effective forward simulation method is proposed for the signals of potential fracturing monitoring.