Orifice blowout preventer for drilling

• Main Authors: HU JIAZHEN, YU HAOYANG, ZHANG CHUANCHEN, DU CHENJUN, CHEN YANFENG, LI HAIYANG, WANG ZAIYOU, WANG FENG, WANG ZHENFENG, CHAI BAOLIANG, ZHANG QINGFENG
• Format: Patent
• Language: Chinese; English
• Published: 22.03.2024
• 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 belongs to the technical field of underground drilling, and discloses an orifice blowout preventer for drilling, which comprises a shell, the shell is provided with a drill rod passage for a drill rod to pass through, and the drill rod passage is at least provided with an entering cavity section, a buffering cavity section and a sealing cavity section in sequence along the axial direction; wherein the diameter of the entering cavity section is smaller than that of the buffering cavity section, so that a buffering space for decelerating entering gas and/or coal is formed in the buffering cavity section; the sealing cavity section is provided with at least one elastic flow blocking piece in the axial direction, the elastic flow blocking piece is provided with a through hole for a drill rod to penetrate through, and the diameter of the through hole is smaller than or equal to that of the drill rod. According to the utility model, a drill rod can conveniently pass through the through hole, flow