| Tight reservoirs stimulated by multistage hydraulic fracturing are commonly characterized by analyzing the hydrocarbon production data. However, analyzing the hydrocarbon production data can best be applied to estimate the effective fracture-matrix interface, and is not enough for a full fracture characterization. Before flowback, the induced fractures are filled with the compressed water. Therefore, analyzing the early-time rate and pressure of fracturing water and gas/oil should in principle be able to partly characterize the induced fractures, and complement the conventional production data analysis.;We develop an analytical model to compare the pressure/rate transient behaviour of multifractured horizontal wells (MFHW) completed in one tight oil and two tight gas wells. We also construct a series of diagnostic plots to study the flowback behaviour of 18 MFHW completed in the Horn River basin. We observe unique signatures that suggest initial free gas in the fracture network before starting the flowback operation. |
