Coring with rope is an advanced drilling method which can obtain the core without drilling.Compared with common drilling method, it has the advantages of good geological effect, high production efficiency and low drilling cost. Advantages of rope coring: 1. Reduce the auxiliary time of tripping and drilling, increase the pure drilling time, the deeper the drilling, the more significant the economic effect; 2. Plug the core immediately to get, improve the core recovery rate; 3. Reduce physical labor of workers; 4. Reduce thread unloading wear of drill pipe, extend drill pipe life and reduce pipe consumption; 5. Reduce the chance of drill bit scavenging wear, unscrewing and collision with hole wall.Extend bit life; 6. Reduce the chance of flushing fluid suction and hole wall pressure losing balance, so as to reduce the accidents inside the hole; 7. Reduce mechanical wear and wire rope consumption during tripping; 8. Reduce borehole curvature and improve borehole quality; 9. It is conducive to drilling repeated strata and avoiding hole wall collapse and dropping blocks; 10. The inclinometer can be lowered in the drill pipe by using the steel wire rope of the coring winch to measure the inclination. In short, core-coring drilling can significantly improve drilling efficiency, ensure rock core quality, and reduce drilling costs. Conditions for rope coring drilling: In core drilling, the following main technical conditions must be met for rope coring drilling: 1. Coring drill tools with reasonable structure and reliable performance include rope coring core pipe and fishing device with fishing, positioning, hanging, signaling, single movement, adjustment and safety trip mechanism; 2. Flexible and durable auxiliary tools and equipment, mainly including drill pipe gripper, elevator, rope coring winch, etc.; 3. High strength internal and external flat drill pipe, including drill pipe body, super high frequency auto auto, hard chrome plated male and female screw joints; 4. Long-life and high-efficiency diamond drill bits, including step-type natural diamond-insert drill bits, impregnated drill bits with different lip shapes and diamond drill bits with combination of natural watch and impregnated; 5. Adopt reasonable drilling procedure and coring operation technology. What are the drilling technical requirements for rope core drilling? Rope coring drilling requires that the drill tool must be capable of both coring and lifting the inner pipe in the drill pipe. Therefore, the rope coring drilling tool is different from ordinary diamond drilling tools in that it can not only move and seize the core, but also must complete the following main actions: 1. The inner core pipe can move from the predetermined position of the drill pipe to the predetermined position of the outer core pipe and be suspended for single movement, so as to prevent the inner core pipe from moving upward in the drilling process, forming a "single pipe" drilling without removing the core; 2. When the inner core pipe reaches the predetermined position in the outer core pipe, it can send a signal to the ground in time, so as to accurately grasp the drilling time of hole scanning; 3. The fishing tool can be lowered from the drill pipe to the upper end of the inner core pipe within a certain speed range, and the inner core pipe containing the core can be retrieved; 4. The fishing device can safely release the inner core pipe when the inner core pipe cannot be lifted or is blocked in the lifting process to prevent damage to the wire rope.
