High-fatigue-resistance drilling tool joint and machining method thereof

• Main Authors: OUYANG ZHIYING, YU SHIJIE, LU XINING, SHU ZHIQIANG
• Format: Patent
• Language: Chinese; English
• Published: 02.08.2022
• 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 invention discloses a high-fatigue-resistance drilling tool joint and a machining method thereof. The high-fatigue-resistance drilling tool joint comprises a male joint and a female joint which are the same in inner diameter and outer diameter, the female joint is provided with a female joint main circular bead, female joint threads and a female joint auxiliary circular bead, the female joint threads comprise conventional female thread teeth and first three special female thread teeth close to the female joint main circular bead, and the thread angle beta of the bearing face of the conventional female thread teeth is 25-45 degrees; the angle difference alpha between the special female thread bearing surface and the conventional female thread bearing surface is 0.1-5 degrees; the male joint is provided with a male joint main circular bead, male joint threads and a male joint auxiliary circular bead, the male joint threads comprise conventional male thread teeth and first three special male thread teeth clo