| 摘要 |
FIELD: drilling equipment. SUBSTANCE: to prevent emergency separation at breakage of drilling tool, it is divided into sections including drill tubes and all other completing articles possessing full-size through washing passages. Located inside aforesaid sections with possibility of installing, removing and replacement are load-carrying safeguard lines fastened between upper and lower anchor adapters which restrict each section. Actual required breaking strength of load-carrying safeguard line counting from drilling tool bottom unit of tubular section should together with determined marginal coefficient exceed summary load created by total mass of all tubular sections and drilling tool bottom unit and also all resistance forces acting on them created during lifting of drilling tool to daylight surface. EFFECT: higher efficiency. 5 cl, 1 dwg |
