Abstract
According to the post fracturing production performance characteristics of the operation wells in Sinopec Argentina work area of San Jorge basin, the more intensive the reconstruction is, the worse the effect is. By comparing the characteristics of typical wells, combining with the distribution characteristics of reservoir, the influence of tuffaceous matter, the state of in-situ stress, and the propagation law of hydraulic fractures, the main factors causing the abnormal performance are revealed. The characteristic parameters of typical wells in the work area are compared, and the main control factors affecting the key parameters of production are discussed. From the fracture scale, working fluid system, pumping parameters and other aspects, the targeted measures are optimized. The practice shows that the success rate of low intensity transformation is higher, which is nearly 10% higher than that of medium intensity transformation; within one year after fracturing, the average daily oil production of single well is 3.0 m<sup>3</sup> higher, and the efficiency is remarkable. According to the characteristics of the work area, the small-scale and low-intensity sand adding transformation scheme is adopted, which improves the success rate and efficiency of hydraulic fracturing operation, and provides a new technical idea for tapping the potential of the next process.
Highlights
The stimulation mechanism of hydraulic fracturing is to improve the bottom hole flow pattern and the reservoir fluid supply capacity through the sand packed or self-supporting fractures created by hydraulic fracturing
The formation mechanism of reservoir stimulation characteristics needs to be discussed by combining formation physical parameters, fracturing pumping parameters, hydraulic fracture parameters and post fracturing dynamic contrast analysis to lock in the key parameters that affect the production, and on this basis to explore the main control factors that affect the parameters
In view of the narrow and thin reservoir in the work area, the hydraulic fractures were easy to penetrate into the surrounding rock and expand, resulting in ineffective filling of sand packed fractures, the optimization of measures mainly was started from the fracture scale, working fluid system and pumping parameters, and the stimulation technology was mainly changed from medium and high intensity stimulation mode to low-intensity stimulation mode
Summary
The stimulation mechanism of hydraulic fracturing is to improve the bottom hole flow pattern and the reservoir fluid supply capacity through the sand packed or self-supporting fractures created by hydraulic fracturing. The stimulation practice of Shengli Oilfield, Yanchang Formation reservoir in Ordos Basin, Liaohe Oilfield, an oilfield in Xinjiang, Hailaer Basin and other oilfields all showed that [3,4,5,6,7,8], within a certain range, there was a roughly positive correlation between post fracturing production and sand loading intensity, that is, the greater the sand loading intensity, the more obvious the effect of increasing production; with the increase of sand loading amount, the increase degree of production slowed down. In the stimulation practice of tuffaceous channel sand reservoir in San Jorge basin, Argentina, the opposite characteristics were shown, showing that the larger the sand adding intensity & fracturing scale, the worse the post fracturing effect. Li Xingchuan et al.: Hydraulic Fracturing Characteristics and Stimulation Optimization of Tuffaceous
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