Double-pipe side-spraying PDC drill bit for coring clean water drilling argillization interlayer

• Main Authors: CAO XUERAN, LI XING, ZHANG CHENGZHI, LI QINGBO, MIAO XUZHANG, ZHANG SHULEI, LI WENLONG, LIU DANDAN, LYU WANHONG, GE ZIJIA
• Format: Patent
• Language: Chinese; English
• Published: 26.01.2021
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The utility model discloses a double-tube side-spraying PDC drill bit for coring a clean water drilling argillization interlayer, which comprises a front drill bit, and the inner side of the bottom ofthe front drill bit is provided with a first step which is arranged at a gap with a clamp spring seat; the rear drill bit is connected with the tail of the front drill bit, a second step is formed atthe joint of the rear drill bit and the front drill bit and located on the outer side of the front drill bit, and the third step is located on the inner side of the rear drill bit and arranged belowthe first step; the flow guide hole is formed in the rear drill bit and provided with a first port located in the second step and a second port located in the third step; and a runner formed by the rear drill bit and the snap spring seat is communicated with the second port of the flow guide hole. The argillization interlayer coring device is ingenious in structure, convenient to use and low in maintenance cost, the erosion