Abstract
The author reviews methods and tools for cutting slots–stress raisers in drill hole walls for directional hydraulic fracturing. Based on the review, the classification is proposed for the known tools by the method of initiating slotting: mechanical cutting; indentation of hard indenters; percussion effect by a plastic substance; blasting of jet charges. By the number of the patented engineering solutions and the level of implementation, the most popular technique is mechanical cutting. The known tools only ensure creation of slots–stress raisers in soft and medium-hard rocks. It is required to continue studies and to develop new methods and tools for cutting initiating slots for the directional hydraulic fracturing in solid ore.
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