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How to save geological spiral drill pipe? How to prevent breakage?
Release time:
2019-05-28
Author:
Source:
The geological spiral drill pipe plays an important role in the drilling process. It transmits the torque of the drilling rig to the drill bit to realize drilling. In the drilling, the geological spiral drill pipe is subjected to a very complex load, almost at the same time under the tension, compression, torsion, bending and other stresses, the quality of the geological spiral drill pipe plays a vital role in the drilling work. The common reasons for the fracture of the geological spiral drill pipe are as follows: 1. The trenchless geological spiral drill pipe has been used for too long and has more surface damage, which is close to or exceeds the fatigue life. Replace the new geological spiral drill pipe in time. 2, geological spiral drill pipe body material, thickness does not meet the technical regulations
The geological spiral drill pipe plays an important role in the drilling process. It transmits the torque of the drilling rig to the drill bit to realize drilling. In the drilling, the geological spiral drill pipe is subjected to a very complex load, almost at the same time under the tension, compression, torsion, bending and other stresses, the quality of the geological spiral drill pipe plays a vital role in the drilling work.
The common reasons for the fracture of the geological spiral drill pipe are as follows:
1. The trenchless geological spiral drill pipe has been used for too long, and has more surface damage, which is close to or exceeds the fatigue life. Replace the new geological spiral drill pipe in time.
2. The material and thickness of geological spiral drill pipe body do not meet the requirements of technical specifications.
3, reaming or long-distance drilling guide hole, the drill suddenly hit a hard object to produce a strong impact. The sudden increase of torque causes the trenchless geological auger pipe to break or twist off. When operating the trenchless drilling rig, the operator shall reasonably control the rotation speed and propulsion force to avoid this kind of situation, drill and pressurize, and drill forward at a suitable rotation speed.
4. The parameter that the curvature radius of the construction hole exceeds the minimum curvature radius of the geological spiral drill pipe controls the minimum curvature radius of the construction hole.
5, geological spiral drill pipe body surface scratches seriously avoid the use of scars of geological spiral drill pipe.
6. The torque of the drilling rig is greater than the torque borne by the inclination angle of the geological spiral drill pipe. Configure the rig with a suitable geological auger pipe.
7. Pair position. Do not form the operation of the geological spiral drill pipe, but be careful not to "don't" "geological spiral drill pipe.
8. Release the drill. Under the action of gravity of geological spiral drill pipe and drilling tool, the process of overcoming the friction force of hole wall and mud buoyancy to realize the extension of geological spiral drill pipe is called drilling. The correct drilling sequence is: the outer rod is lowered into place, and the adjacent inner rod starts to extend from the inner of the outer rod, from the outside to the inside, one by one.
geological spiral drill pipe how to save?
1. avoid moisture
Avoid storage in a humid environment, because the geological spiral drill pipe in a humid environment, the surface covered with moisture and oxygen chemical reaction to form rust, damage the quality of geological spiral drill pipe, and then affect sales. Geological and geological spiral drill pipe should not be placed in places where the temperature is too high and in direct sunlight. Direct sunlight will cause the temperature of the geological and geological spiral drill pipe to rise, expand with heat and shrink with cold, which changes the physical characteristics of the geological and geological spiral drill pipe, resulting in damage or tooth loss during use.
2Avoid corrosion
The geological and geological spiral drill pipe placed in a corrosive chemical environment, will seriously corrode the surface of the geological and geological spiral drill pipe, generally used in the corrosive environment of geological and geological spiral drill pipe is mostly galvanized or nickel-plated geological spiral drill pipe.
How to prevent breakage?
1, the hole sealer must be used straight, it is strictly prohibited to discount heavy pressure.
2. Adjust the sequence valve (opening pressure should be greater than 1MPa) when using geological spiral drill pipe. Pressure gauge should be provided to monitor the pipeline. Pressure water is strictly prohibited from being higher than the working pressure. Remove the pressure water pipeline after the operation. When the sealer is depressurized and has no water, restore it to its original state, and draw out the sealer for sorting and standby.
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 spiral 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:
Geology, drill pipe, spiral, pressure, avoid, expansion, drilling
