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What issues should be noted when using non-magnetic drilling tools
release time：2024-02-26
source： network
The emergence of non-magnetic drilling tools has brought great convenience to our work and is widely used in various places. However, there are many issues that need to be paid attention to during use. What are the issues that need to be paid attention to?Next, let me explain its related knowledge points to you:
1. Non magnetic drilling tools shall not be suspended for a long time for circulation, and shall not be compressed for circulation.
2. When the drill bit is stuck, it is not allowed to rotate the pipe string to prevent the screw water cap from being inverted and the core shaft from falling into the well.
3. Self sealing devices should be installed at the wellhead to prevent small items from falling into the well. After the screw drilling tool is lifted to the bypass valve position, remove all components from the bypass valve port, rinse with clean water from the top of the bypass valve, and then use a wooden rod or hammer handle to press and release the valve core to move without obstruction. After cleaning, screw on the lifting short joint and remove the screw drilling tool.
4. The upper water tank and the return water sedimentation tank should be used separately, and the returned well washing fluid should be settled before use.
5. Before and after drilling, the well should be thoroughly cleaned to ensure that there are no drilling cuttings in the well. The theoretical output torque of the guide vane is directly proportional to the pressure drop of the motor, and the output speed is directly proportional to the input mud flow rate. As the load increases, the drilling tool speed decreases. Therefore, as long as the reading of the pressure gauge on the surface and the flow rate of the pump are controlled, the torque and speed of the downhole drilling tool can be controlled.
6. During drilling, if the pump pressure drops and ground factors are excluded, it may be due to drilling tool leakage, damage to the bypass valve hole, or screw casing inversion. The drilling should be immediately lifted out.
7. During drilling, if the pump pressure suddenly increases, the electric motor, engine, and transmission shaft may get stuck or the drill bit may be blocked by water. At this time, the well cannot be backwashed and should be immediately lifted out of the hole. When the mud pumped out by the mud pump passes through the bypass valve and enters the motor, a certain pressure difference is formed at the inlet and outlet of the motor, which drives the rotor to rotate around the axis of the stator, and transmits the speed and torque to the drill bit through the universal joint and transmission shaft, thus achieving drilling operations.
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