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Unconventional stimulation technologies---state of the art and considerations for further development. (In Japanese). X. Zhongtian et al. J. Xi'an Petrol. Inst., 1996, 11(1), 15--18.

The current state of eight relevant technologies is outlined. They include high energy gas fracturing, hydraulic oscillation, sonic and ultrasonic wave, artificial earthquake, electric shock, wellbore deep penetration, and formation loosening by explosion and chemical combustion. Consideration is also given to suggestions for developing a number of unconventional stimulation technologies.

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