Diamond three diamonds, Henan Diamond, Yellow River Cyclone, and Sifangda collectively rose. As of 14:24 on August 31, the Yellow River whirlwind and Sifang reached a daily limit, and Yu Diamond rose nearly 9%. It is reported that the second round of bidding for shale gas is about to start. According to US experience, in the three stages of exploration, drilling and gas production for shale gas development, the priority is the exploration equipment. According to media analysis, diamond drill bits are commonly used because of the high drilling rate requirements for shale gas exploration.
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