no, because fracking is the deliberate fracturing of the reservoir with increased pressure, which can penetrate into the water table and contaminate water wells

no, because fracking is the deliberate fracturing of the reservoir with increased pressure, which can penetrate into the water table and contaminate water wells. This is using the old well as a disposal for the used/fracking/whatever water - not repressurizing this well. The column of fluid acts as a cap on the reservoir pressure that wants to vacate the old well. What's likely happening is an alternative exit (maybe created by fracking, maybe not?) is allowing the well to produce, vacating water, contaminants and oil.