Common causes of drill pipe fracture: 1. Materials and production and processing. (1) Drill pipe material. The market for the sale of exploration raw materials is very chaotic these days. Shopkeepers who don't keep their word are fake and shoddy. Most customers only consider it cheap and cannot distinguish the quality of pipe fittings. Many customers pay high prices to buy itemized materials and pipe fittings, just to talk about how good their things are. (2) Production and processing quality. The key quality lies in the production and processing specifications, production and processing types, production and processing quality, and processing accuracy of the connecting thread. Depends on mechanical equipment, mainly including ordinary CNC machining (thread size is not guaranteed, parallelism is not guaranteed), double-head CNC lathe machining

　　Common causes of drill pipe breakage

　　1. Materials and production and processing

　　(1) Drill pipe material. The market for the sale of exploration raw materials is very chaotic these days. Shopkeepers who don't keep their word are fake and shoddy. Most customers only consider it cheap and cannot distinguish the quality of pipe fittings. Many customers pay high prices to buy itemized materials and pipe fittings, just to talk about how good their things are.

　　(2) Production and processing quality. The key quality lies in the production and processing specifications, production and processing types, production and processing quality, and processing accuracy of the connecting thread. Depending on the mechanical equipment, it mainly includes ordinary CNC machining (thread size is not guaranteed, parallelism is not guaranteed), double-head CNC lathe processing (thread size is guaranteed, parallelism is not guaranteed), and multi-head CNC lathe processing (thread size is guaranteed, parallelism is guaranteed. ).

　　(3) Heat treatment method. Such as heat treatment and curing.

　　2. Supporting facilities

　　1. It is recommended to use the same manufacturer for drilling pipes and twist drills, reducing joints, taps, and other supporting facilities.

　　2. Ensure the unification of specifications and achieve better applicability.

　　3. Mixed application of two manufacturers' products.

　　4. Many customers are replaced by Zhang San and Li Si, which are easy to break;

　　3. Apply on the spot

　　(1) The working pressure should not be too high during actual operation. Once the DTH bit is stuck, do not knock it;

　　(2) During the entire dismantling process, handle with care and do not litter or litter.

　　(3) During the thread removal process, do not hit it hard with a hammer.

　　(4) The drill pipe has a service life. If it exceeds the service life, it should be replaced as a whole. You cannot change half or two;

　　(5) If the external thread is found to be seriously damaged, it should be replaced immediately.

　　(6) Prevent long overdue drill pipe and new drill pipe from being mixed.

　　(7) Prevent drill pipes of different specifications from being mixed.

　　Fourth, drilling into the production process

　　(1) Effective mix ratio of twist drill drilling equipment, maintain effective outer ring line clearance, apply appropriate drag-reducing agent, maintain the wettability of the mortar, and reduce the rotational friction resistance of the drilling equipment.

　　(2) Avoid the bending of the drilling equipment due to over-diameter drilling, and then break the drill pipe.

　　(3) The main parameters of the effective drilling process, too high WOB, and too high-speed ratio are very easy to cause the drill pipe to break.

　　(4) In the case of a complex geological structure, rope core drilling should be used, and corresponding treatment measures should be selected, otherwise the safety accident of drill pipe fracture will continue to occur.

　　(5) During the operation, prevent upsetting and twisting.