Abstract

Diagnosis of hydraulic fracturing is of great significance for field treatment guidance. The real-time analysis of the pressure curve is helpful to evaluate the hydraulic fracture status, and provide guidance for the adjustment of the fracturing treatment. However, the response pattern of hydraulic fracture propagation and fluid flow in the pressure curve is still unclear and difficult to capture. In this paper, the 2D hydraulic fracturing model was built to investigate the effects of different stress differences, elastic modulus, and variable rate. Simultaneously, the wavelet analysis method was introduced to observe its response characteristics. Taking the peak energy of the wavelet as the standard, the db5 wavelet basis is selected as the optimal wavelet basis and the first decomposition level is the optimal recognition level. There is a positive correlation between the pressure drop value and the wavelet peak energy under different stress difference and elastic modulus. In addition, we compared the pressure drop ratio and the wavelet energy ratio found that the wavelet energy can greatly amplify the impact of pressure fluctuations. Comparing the wavelet energy of pressure and rate can eliminate the influence of rate fluctuation on pressure. Finally, the field treatment curve was decomposed and explained by wavelet analysis, then it is compared with the results of microseismic interpretation for the first time. This paper can provide further reference for the interpretation of hydraulic fracturing curves.

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