Hydrajet fracturing has the advantages which not only include perforating without compacted zone, creating fracture exactly, but also include controlling fracture height, shortening the working cycle, reducing operation risk and etc.[. Through studying the optimization of nozzle materials and combination, string structure, operation pressure of surface casing and annular displacement, the hydraulic jet multistage fracturing technology is formed. This technology is successfully used and proves it has good popularization and application.
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