How do shocks and vibrations affect drilling?

These different types of shocks occur simultaneously, creating serious drilling problems which often requires drilling to stop and then restart. Careful planning, execution and post-drive analysis will often reduce the hazards of these shocks and vibrations. We hope this presentation will assist you in this endeavor.

What is shock in a drilling environment?

Shock in a drilling environment is the sudden input of energy from impacts of the bit, BHA or drill pipe with the wellbore. Vibrations can result from the shocks. Rapid and continuous vibrations result in fatigue of the drill string connections to the point of twisting off.

What causes drill pipe fatigue?

Drill pipe fatigue: Typically seen as microcracks, macrocracks, and fractures in the drill string and piping. Fatigue is most often caused by some combination of cyclic stresses and corrosion. While it may be impossible to totally eliminate drill pipe issues and failure, there are steps that can be taken to minimize the occurrence and magnitude.

What causes stuck pipe during drilling?

Poorly consolidated formations: Poorly consolidated formations, such as sandstones and conglomerates, are prone to collapse during drilling, leading to stuck pipe. IV. Inadequate Drill String Design

How can cyclic stress prevent drill pipe failures?

For example, fatigue-based failures can be mitigated by reducing cyclic stresses and managing the drilling environment to be less corrosive. Proper handling and inspection of the drill string can also help to prevent drill pipe failures. Fig. 1 Failure Analysis of Drill Pipe: A Review Source: DirectScience.com 2. Cyclic Stress

Why is my drill pipe corrosive?

Drill pipe corrosion is caused by a variety of chemicals in the drilling mud that then interact with the metal in the drill pipe. The most harmful of these chemicals include oxygen, carbon dioxide, and hydrogen sulfide. Dissolved salts and organic acids can also cause corrosive damage to metal drill pipes.