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How is the geological drill pipe used?
Release time:
2019-05-27
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How is the geological drill pipe used?
How is the geological drill pipe used?
geological drill pipeIn the foundation construction, we often encounter the rock layer with the hardness above the medium weathered in the geology, which requires a set of pile machine sharp weapon with perfect configuration to improve our construction progress. Here to talk about the relevant content of the drill pipe
Geological Drill Pipe,The drill pipe is a rod connecting the drill bit in the drilling tool to transmit power, which is widely used at present. The usual components of the drill pipe are: drill bit, drill collar, drill pipe, stabilizer, special joint and kelly pipe. the basic role of drill pipe is:
(1) Tripping and tripping bit;
(2) Application of weight on bit;
(3) power transmission;
(4) Conveying drilling fluid;
(5) Special operations: squeeze cement and deal with downhole accidents.
geological drill pipe How to choose to useWhat?
1 According to the drilling capacity parameters and drilling diameter of the drilling rig, the drilling depth can be drilled, and the drill pipe diameter is determined according to the empirical ratio of D/d = 4.5. The maximum allowable length of the drill pipe of the rotary drilling rig shall be determined according to the effective height of the mast and the stability under the condition of self-weight, and the number of joints of the drill pipe of the rotary drilling rig shall be determined according to the design hole depth of the drilling rig and the effective use length of each drill pipe.
2 According to the main parameters of the drill pipe design, namely torque and feed pressure, the drill pipe of the drilling rig is rotary dug. We know that the torque transmitted by the drill pipe is transmitted by the engagement and extrusion of the key and the keyway. Due to the processing accuracy, material properties, welding quality and other reasons, it is impossible to divide the torque evenly on each key ideally, and each contact key cannot contact the force evenly. Therefore, the long key is often partially broken. When selecting the design torque of the drill pipe of the rotary drilling rig, it must be greater than the design torque of the drilling rig,
geological drill pipeHow to prevent breakage?
1, the hole sealer must be used straight, it is strictly prohibited to discount heavy pressure.
2, when using geological drill pipe adjust the sequence valve (opening pressure should be greater than 1MPa), the pipeline should be monitored by pressure gauge, pressure water is strictly prohibited to be higher than the working pressure, after the operation is completed, remove the pressure water pipeline, when the hole sealer is relieved without water, restore to its original state, pull out the hole sealer for finishing.
3. All hole sealers must be put into the drilling hole and are strictly prohibited from being exposed outside the hole. Exposed outside the hole, the expansion is easy to burst. It is suggested that soft coal should be put into the drilling hole for more than 1 m, and hard coal should be put into the drilling hole for more than 0.5 m.
4. If it is found that the expansion body does not expand, first check whether the pressure water exceeds 1MPa, and then check whether the cone core of the sequence valve is stuck by debris and cannot be closed. If there are sundries, rinse them with water and install them. The spring in the sequence valve has no direction, and the tip of the cone valve core is in the direction of expansion, so it should be avoided to remove the reverse. Guide body: used to lead the hole sealer into the drilled bottom hole of the coal seam, and its front end is equipped with a sequence valve.
5. During water injection, the operator cannot face the drilling hole to avoid hurting people when the pressure in the hole is high and the short-term low pressure of the external pipeline extrudes the hole sealer out of the hole.
6. Adjust the spring pressure of the geological drill pipe sequence valve to control the opening pressure of the valve. For example, the opening pressure of the sequence valve is adjusted to 2MPa. When the inlet pressure is ≤ 2MPa, the valve is closed, the inlet water is blocked in the expansion cavity, and the expansion body expands rapidly (the diameter increases and the length decreases).
Key words:
Geological drill pipe, drill pipe, spiral drill pipe
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