Research on channel pattern of hydraulic sand blasting perforation

To further study the mechanism of hydraulic sand blasting perforation and examine the channel pattern and porous depth formed by hydraulic sand blasting perforation, a research on channel pattern of hydraulic sand blasting perforation has been carried out to observe the influence of lithology, displacement and blasting time on hydraulic sand blasting perforation and master the characteristics of fracture initiation. This paper has completed the design and manufacture of both outcrop core and cements targets, and optimized the experimental parameters and integrated tools, which were used to finish the hydraulic sand blasting perforation experiment and the fracture initiation experiment. In order to obtain more real and intuitive channel shape, the specific integrated tool has dissected and drawn the targets. These two experiments show that channels depth caused by hydraulic blasting is shallower than that induced by former laboratory experiment results. Two main channel forms resulting from hydraulic sand blasting perforation are fusiform-channel in the normal perforation target and built-up channel combing fusiform-channel with sword-channel. The two channel induced by hydraulic perforation almost symmetrical in shape. When the fracture is initiated, the depth will increase multiply. these conclusions are very reliable and helpful to further understand the mechanism of hydraulic sand blasting fracturing and improve and widespread this technology.