Special-shaped multi-edge grooved drill pipe-main advantage analysis

Release time:

2019-07-15

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2. Analysis of Main Advantages The rotation of this series of drill pipes in loose cinder can cause vortex flow. Pulverized coal deposited at the bottom of the borehole is raised by the edge of the drill pipe, and the pulverized coal in the hole is always in motion, thus avoiding accumulation and blockage of pulverized coal in the borehole. At the same time, the discontinuous spiral groove on the surface can assist the cinder to be transported outward. Therefore, it is not easy to cause the phenomenon of drilling and sticking. The principle of rotating a shaped multi-edged cross-sectional rigid body in loose cinder causes vortex flow along the axis of the rigid body.

Analysis of the main advantages of 2.

The rotation of this series of drill pipes in loose cinder can cause vortex flow. The coal powder deposited at the bottom of the borehole is raised by the edge of the drill pipe, and the coal powder in the hole is always in motion, thus avoiding the accumulation and blockage of coal powder in the borehole. At the same time, the discontinuous spiral groove on the surface can assist the coal cinder to be transported outward. When the hole collapses in the hole, the collapsed hole is transported outward through through the function of the spiral groove. Therefore, it is not easy to cause the phenomenon of drilling and sticking.

The principle of vortex flow along the axial direction of the rigid body caused by the rotation of the special-shaped multi-prismatic rigid body in loose cinder. When the drill pipe is buried by loose cinder in high-speed drilling, a slag discharge channel (vortex zone) can be formed in several grooves around the drill pipe to allow the slag discharge airflow to pass through. The airflow or water flow is fed through the inner hole, and the cinder is discharged through the slag discharge channel to reduce the rotation resistance of the drill pipe. At the same time, discontinuous spiral grooves are arranged on the surface of the rod body to assist the coal cinder to be transported outward. When the hole collapses in the drill hole, the hole collapses are transported outward through the hole stripping function of the spiral groove.

The main body circular grooved drill pipe, rib drill pipe and special-shaped multi-edge grooved drill pipe all have cooling function, especially the latter has directional righting function (not easy to collapse holes, good hole forming quality), taking into account multiple slag discharge principles, and will become the main drilling tool for gas extraction deep hole drilling. Compared with the current coal mine gas drainage using smooth round drill pipe and ordinary triangular drill pipe, because the rod body has no groove structure, protruding coal seam, especially soft coal seam, should not use hydraulic slag drilling. Dry drilling lacks cooling function under blockage (cinder cannot move along the axial direction).

Comprehensive comparison, special-shaped multi-edge grooved drill pipe, with hole protection, pressure relief, righting, cooling four effects.

Key words:

Special-shaped multi-edge grooved drill pipe, geological, spiral, three-edge, rib, drill pipe

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