You must know these skills when buying active drill pipes!
Drill pipe is the basic component of drill string. Its main function is to transmit torque and transport drilling fluid, and the wellbore is continuously deepened by the gradual lengthening of the drill pipe.
The buying skills of drill pipes are actually very simple. As the saying goes, “snake a snake and hit seven inches”. Although this proverb is not appropriate to use here, the meaning of solving problems and grasping the key is particularly reasonable. The key issue of drill pipe purchase can be started from the reason of drill pipe fracture and failure, and then master how to distinguish the quality of drill pipe when purchasing.
1. Regarding the common causes of drill pipe fractures, professionals from Ningbo Zhedong Geological Equipment and Drilling Tool Brand have summarized the following points for everyone: 1. The drill pipe has been used for too long, and there are many surface damages, which are close to or exceed the fatigue life. Ningbo Zhedong Geological Equipment reminds you to avoid the use of scratched drill pipes, and to replace new drill pipes in time when there is loss. 2. The material and thickness of the drill pipe body do not meet the requirements of the technical specifications. When purchasing, you should choose the best brand drill pipe, and the quality is guaranteed. 3. When reaming a hole or drilling a pilot hole for a long distance, the drill bit suddenly hits a hard object and produces a strong impact force, resulting in a sudden increase in torque, causing the drill pipe to break or twist. Ningbo Zhedong Geological Equipment reminds the operator that the rotation speed and propulsion force should be reasonably controlled when operating the drilling rig to avoid such situations, drilling, pressurizing, and forward drilling at a suitable rotation speed. 4. If the curvature radius of the construction hole exceeds the parameter of the minimum curvature radius of the drill pipe, it is necessary to control the minimum curvature radius of the construction hole.
5. Improper daily preservation, placement and maintenance of the drill pipe will cause the drill pipe to rust, corrode or deform and bend, which is also an important reason for the damage to the performance of the drill pipe and easy failure. 6. The torque of the drilling rig is greater than the torque borne by the inclination of the drill pipe. Therefore, we need to configure the appropriate drill pipe for the drilling rig. 7. Align the hole position. Do not form the operation of the drill pipe, but be careful not to "do" the drill pipe. 8. Drilling. Under the action of the gravity of the drill pipe and the drilling tool, the process of overcoming the friction force of the hole wall and the buoyancy of the mud to realize the extension of the drill pipe is called dredging. The correct drilling sequence is as follows: the outer rod is lowered into place, and the adjacent inner rods start to protrude from the outer rod, from the outside to the inside, complete one by one.
2. After understanding the reasons for the failure and fracture of the drill pipe, it is necessary to take preventive measures in advance. In addition to starting from its own operation and daily maintenance, it is also necessary to purchase drill pipes with reliable quality.
Generally, a good drill pipe is not easy to be bent or broken by fatigue, and has high mechanical properties, fatigue resistance, shear strength, and bending strength. Has a long service life. To meet these requirements, the drill pipe requires not only good raw materials, but also exquisite workmanship.