Breakdown Pressure Prediction of Tight Sandstone Horizontal Wells Based on the Mechanism Model and Multiple Linear Regression Model

Abstract

Accurately predicting the breakdown pressure in horizontal sections is essential when designing and optimizing fracturing jobs for horizontal wells in tight gas reservoirs. Taking the Sulige block in the Ordos Basin as an example, for different completion methods combined with indoor rock experience data and well data, a new method for predicting breakdown pressure based on a linear regression model is proposed. Based on the Hossain horizontal well stress field model, this paper established a calculation model of breakdown pressure under different completion methods by using experimental and well data. The average error between the calculation results and the actual breakdown pressure at the initiation point is 3.67%. A Pearson correlation analysis was conducted for eight sensitive factors of horizontal well stress, which showed that the maximum horizontal principal stress, minimum horizontal principal stress, tensile strength, and elastic modulus had strong linear correlations with breakdown pressure. In this study, multiple linear regression was used to establish the prediction model of breakdown pressure under different completion conditions, and the calculation method of the prediction model was optimized. The model was verified using the relevant data for four horizontal wells. The average relative error between the prediction model and the actual breakdown pressure was 4.33–6.30%, indicating that the breakdown pressure obtained by the new prediction model was similar to the actual conditions. Thus, the prediction model is reasonable and reliable.

Assessment of Saturation Effect on Hydraulic Fracturing in Sandstone and Thermally Treated Granite

“…Meanwhile, BP and fracture aperture, as well as their mechanical parameters, decreased in both mineral-oil-saturated sandstone and TT samples, shown in Figures 21 and 22. The obtained correlations align well with [42,[44][45][46]. The described findings could be associated with the preliminary exposure of the rock matrix to saturation and thermal treatment.…”

Establishment and Application of a Pattern for Identifying Sedimentary Microfacies of a Single Horizontal Well: An Example from the Eastern Transition Block in the Daqing Oilfield, Songliao Basin, China

“…The reservoir sedimentary environment is relatively stable, and the technology for horizontal well development is relatively mature [54][55][56][57][58]. Compared with other countries, China's reservoir of terrigenous clastic rock sand bodies has stronger vertical and horizontal heterogeneity; thus, studying the fine sedimentary microfacies of horizontal wells is recommended [59][60][61]. The segmented microfacies description of a single horizontal well combined with vertical well data is essential for objectively characterizing different reservoir sand bodies.…”