What are the characteristics of heavy drill pipe?

Classification:

Company News

Release time:

2021-05-08

【Summary Description】

钻杆

Weightdrill pipeIt is a transition drill column section between ordinary drill pipe and drill collar, which can effectively alleviate the stress concentration of drill collar and drill pipe in the transition section in combination, provide drill pressure, and can effectively reduce the connection area and outer diameter wear rate of drill column and well wall.

The weighted drill pipe has the following characteristics:

1.Its drill pipe joint is longer than ordinary drill pipe, which can provide a larger wear-resistant surface and weight, and the joint thread can be repaired many times;

2.It is heavier than the drill pipe of the same size, and the wall thickness is more than ordinarydrill pipeAdded2-3Times, the outer diameter of the pipe body and joint is the same as that of ordinary drill pipe, the inner hole is flat, and the diameter of the inner hole is at least equal to the inner diameter of the drill collar.

3.The middle outer thickened section acts as a small stabilizer.,Increased resistance to bending.

4.Joint surface welding wear-resistant carbide, life can be extended4Times.

5.Drill string fatigue failure often occurs on several drill pipes above the drill collar, because the section changes sharply when the drill collar transitions to the drill pipe, and the bending stress is concentrated on this part of the drill pipe. If you add between the drill collar and the drill pipe15～30Weight drill pipe, weightdrill pipeIt can ease the change of the section, reduce the stress concentration, and prevent the fatigue damage of the drill pipe connected with the drill collar, thereby reducing the accident of the drilling tool. In addition, compared with the drill collar, the weighted drill pipe has the advantages of easy fishing, shortening the tripping time, convenient handling, etc., and can maintain the orientation of the directional well and play a role in stabilizing the deviation. In the case of the same hook load and weight on bit, the use of weighted drill pipe can also improve the drilling depth capacity of the drilling rig.

6.For directional wells: after the weighted drill pipe is connected to the drill string of directional wells, the drill collar and the weighted drill pipe body can not be closely attached to the well wall, thus reducing the possibility of sticking and sticking. In addition, the sliding drilling process is conducive to the trajectory control of directional wells and horizontal wells. It can also better control the inclination angle and azimuth angle of the well, reduce the number of directional work, and shorten the construction cycle of directional wells.

Key words:

weilida drill