Turbulent flow disturbance drilling pressure-relief drill pipe

Abstract

The invention mainly provides a turbulent flow disturbance drilling pressure-relief drill pipe. Drilling slag is disturbed in a pore through a cuboid hump and a trapezoidal humpwhich are arranged on the surface of a drill pipe.During drilling in a low speed, the drill pipe can move in a state of a laminar flow; during moving in a high speed, a plurality of pieces of turbulence are formed by the drilling slag in the pore so pressure generated by a stratum is diffused and a large amount of the drilling slag is placed for concentration, through a cuboid gap and a trapezoidal gap, heat dissipatingis conducted on the surface of the drill pipe, and pressure formed by the drilling slag is released in the axial direction of the drill pipe. Drilling pipe sticking and pressing can be effectively prevented, and damage, caused by overload of the drill pipe, to a drilling rig is avoided.

Description

technical field [0001] The invention mainly relates to a pressure-relieving drill pipe for turbulent flow disturbance drilling, which is mainly used for drilling in rock formations with faults, in formations with obvious fractures and in diverse coal formations. Background technique [0002] When drilling in ordinary coal seams or stable rock formations, the movement speed of the drilling slag is constant with the speed of the drilling rig. The drilling fluid in the drill pipe is injected with a large flow rate and forms a reverse flush in the drilling channel to drive the drilling slag out. Stable drilling into strata is the ideal state of forming drilling construction, and it is also a necessary process construction condition. However, there are only a handful of good drilling strata at present. Most strata have prominent joints and fissures or have fault planes under different structures. In coal The interlaced zone of the rock mass is mostly due to the high pressure caus...

AI Technical Summary

Problems solved by technology

[0002] When drilling in ordinary coal seams or stable rock formations, the movement speed of the drilling slag is constant with the speed of the drilling rig. The drilling fluid in the drill pipe is injected with a large flow rate and forms a reverse flush in the drilling channel to drive the drilling slag out. Stable drilling into strata is the ideal state of forming drilling construction, and it is also a necessary process construction condition. However, there are only a handful of good drilling strata at present. Most strata have prominent joints and fissures or have fault planes under different structures. In coal The interlaced zone of the rock mass is mostly due to the high pressure caused by the relationship between the two. It is relatively difficult to drill holes in the above-mentioned strata. Using traditional drilling tools will frequently cause drilling accidents. The most common such as drill sticking is due to Faults in the strata in the borehole are caused. If there is pressure drilling, it is because the drilling tool deviates the drilling angle according to the rock joint fissure or the hardness of the coal seam during drilling, which to a certain extent causes the drilling slag to be discharged poorly. A blockage section is formed in the hole, and the drilling slag in the blockage section is controlled by force in the same direction according to the rotation direction of the drilling rig, and then the force is transmitted to the drill tool to generate a cluster-shaped external force on the drill tool, which increases the load of the drill tool several times in an instant, causing the drill tool Damage, currently there is no drill with obvious function to eliminate the external force caused by the drilling accident in the drilling process so as to ensure the integrity of the drilling tool

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