Experimental researches introduced in this paper combined the fracturing technology, which was needed in Chang-6 stratum of Changqing Oilfield, were carried out with full-size and holo-authentic. and used field jetting tools, parameters and equipments to simulate the process of hydrajet perforating and fracture initiation. All of these were different from the previous.

A real-hole shape and crack structure of the near-wellbore were obtained while dissection 9 experimental samples by special tools.

The experiment results shown that: The whole jetting hole is tear-drop shaped, including four parts: casing perforation, entrance sputtering section, cement necking section and main section. When fracture initiates, a slim channel with gladiate shape is extended in the end of the hole. Secondly, the sample will fracture when jetting velocity is high enough under test condition. It indicates that pressure in jetting hole increases obviously when jetting velocity increases. Thirdly, jetting flow erodes out a slim channel along crack propagate direction when fracture initiates, which increases the jetting hole length doubly and enhances the penetration efficiency. Finally, six individual channels are connected by crack when fracture initiates. It indicates that jetting channels can guide the crack initiation and extension near the well bore under the test condition.

The results of the simulating experiments could be used as the design reference when jetting and fracturing in the similar stratum.

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