The drill collar is a tool used for drilling, sampling, fixing, etc. The drill collar is connected to the drill pipe and plays an overall weighting role to prevent backlash. The inner diameter of the drill collar is smaller than the drill pipe and its weight is larger than the drill pipe. big. Its main principle is to use a fast motor or manual pusher to drive the blade to rotate in the direction to be drilled to achieve the purpose of drilling. There are two main types of drill collars on the market: manual drill collars and electric drill collars. Among them, manual drill collars are suitable for light work, such as simple drilling or fixing screws. Electric drill collars, on the other hand, are suitable for drilling jobs that require large amounts of drilling or deeper, harder materials. A drill collar is a thick-walled round steel pipe. It is connected to the drill bit to apply drilling pressure and torque to the drill bit and prevent well deviation. Drill jacks of different sizes should be selected according to the drill bit size. Drill collar sizes range from 31/8 to 11 inches, and the heaviest drill collar can weigh up to 300 kilograms per meter. The connecting threads at both ends of the drill collar are tapered male and female buttons.
Drill collars can be divided into three forms based on appearance and material. Type A (cylindrical): Made of ordinary alloy steel, the cross section of the tube body is round both inside and outside. The code is ZT. Drill collars are generally divided into 3 types. Types: spiral drill collar, non-magnetic drill collar, solid drill collar.The integral drill collar is a smooth thick-walled tube with connecting threads processed on both ends.
The function of drill collar
1. Drilling
Drilling is one of the most common uses for drill collars. Different sizes and types of drill collars are suitable for different hole diameters and depths, and are suitable for hole diameters in different materials.
2. Sampling
In scientific experiments or exploration situations, it is necessary to sample a certain material or geological structure. In this case, a sampling drill collar is needed. It allows users to easily obtain samples to continue research.
3. Fixed
In some workplaces where certain operations need to be done by fixing screws to objects, a screw drill collar is needed. It helps users securely fasten screws to objects to prevent them from slipping or loosening.
Things to note when choosing drill collars
1. Choose the correct specification, type and material of drill collar according to your needs.
2. Pay attention to safety when using to avoid injury.
3. Before drilling or fixing, first clarify the location, depth and size of the hole to avoid errors.
4. For manual drill collars, you need to pay attention to the size and angle of force to avoid drilling deviation or damage to the drill collar. 5. Pay attention to cooling when drilling to avoid loosening and damage caused by overheating of the drill collar.
Drill collar applications
Geotechnical engineering: In geotechnical engineering, drill collars are used to drill foundation holes, consolidation grouting holes, drainage holes, etc., to provide support for the foundation and foundation reinforcement of buildings.
Building construction: In building construction, drill collars are used to prefab holes, install pipes, fix anchors, etc., to provide support for the structure of the building and the installation of equipment.
Water conservancy projects: In water conservancy projects, drill collars can be used for drilling wells, water intake, drainage, etc. to provide technical support for the development and utilization of water resources.
Mining engineering: In mining engineering, drill collars are used for drilling mineral strata, fixed support projects, drainage, etc., to provide guarantee for mining and safe production.
Conclusion
In short, the drill collar is a very commonly used tool, and its scope of use covers many fields such as the construction industry, decoration industry, and scientific research. You need to pay attention to safety when using it, and choose drill collars of specifications and materials to avoid damage and accidents.