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The operating procedures of the drill pipe are as follows and the form of abrasive wear
Release time:
2019-05-27
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The operating procedures of the drill pipe are as follows and the form of abrasive wear. The drill pipe is a steel pipe with a thread at the tail, which is used to connect the surface equipment of the drilling rig and the drilling equipment or bottom hole device at the bottom of the drilling. The purpose of the drill pipe is to carry drilling mud to the drill bit and raise, lower or rotate the bottom hole device together with the drill bit. The drill pipe must be able to withstand large torques, twists, bends and vibrations during rotation. During the drilling process, the drill pipe can be used multiple times. The operation procedures of drill pipe are as follows: 1. Apair the hole position. does not form an operation on the drill pipe,
The operating procedures of the drill pipe are as follows and the form of abrasive wear
A drill pipe is a steel pipe with a thread at the tail, which is used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or bottom hole device at the bottom of the drilling. The purpose of the drill pipe is to carry drilling mud to the drill bit and raise, lower or rotate the bottom hole device together with the drill bit. The drill pipe must be able to withstand large torques, twists, bends and vibrations during rotation. During the drilling process, the drill pipe can be used multiple times.
The operating procedures of drill pipe are as follows:
1Pair position. Do not form the operation of the drill pipe, but be careful not“Don't.”Drill pipe.
2Drill release. 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 mud buoyancy to achieve the extension of the 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.
32. Drilling, pressurization, forward rotation drilling at appropriate rotation speed.
42. Unload the whole bottom. Be careful not to unload and close the bottom.“Don't.”Drill pipe. Note: When using friction drill pipe for drilling, always include“Hole location, drilling, drilling, lifting, unloading and bottom closing”Five in order. To do“Not in order”,“No disorder”,“Not randomly increasing”.
The form of abrasive wear of drill pipe
Abrasive wear is the phenomenon of surface abrasion and surface material shedding caused by the external hard particles or the micro-peaks of the hard surface in the process of relative movement of the friction pair, and the surface characteristics of the drill string are abrasions, longitudinal pull marks, local peeling and cracks.
Abrasive wear mechanism for micro-cuttingMultiple plastic changes lead to fracture and micro-fracture. The drill string is prone to large bending under the composite stress state, and serious friction occurs between the protruding place and the hard rock layer after bending. The quenching thickness of the surface of the drill string is generally1mm,After the quenched layer is worn away, the subsequent wear rate will be accelerated. In deep hole drilling, sometimes the surface of the removed drill pipe has obvious scratches, which is the performance of abrasive wear.
On the use of drill pipe to explain the conditions:
1The rated torque of the selected drill pipe should be greater than the large torque of the drilling rig. The rotation speed of the drilling machine shall be less than the rotation speed of the drill pipe (the impact of the moment of inertia of the drilling tool on the drill pipe shall be less than the rated torque of the drill pipe).
2In a certain stratum, when the sum of the weight of the completely unextended drill pipe cannot make the drill teeth of the drill tool eat into the native soil layer, it is not allowed to use the friction drill pipe for drilling.
3When using friction resistance drill pipe to drill inclined holes, the telescopic direction of the drill pipe must be well guided when using casing and drilling tools, and the included angle between the center lines of pipe joints must not exceed0.4Degree.
42. Drill vertical holes, with the drilling inclination exceeding“JTJ041-2000Technical code for construction of highway bridges and culverts”When the hole inclination is specified, it is easy to cause damage to the friction drill pipe.
The above is about drill pipe,Related content introduction,Beneficial Mining Technology--Hope to help you.
Key words:
Drill Pipe, Geological Drill Pipe, Spiral Drill Pipe
