In drilling operations, due to complex geological structures (such as borehole collapse, plastic flow and extrusion of the formation in the open eye), improper technical measures (such as long pump shutdown, drill bit mud bag, etc.), drilling tools often encounter obstruction and jamming, and the vibrator is one of the effective tools to relieve the stuck drilling accident.
When the vibrator needs to strike up, apply enough pretension force on the ground, unlock the locking mechanism in the tool, release the drill string energy storage, and the hammer of the vibrator hits the anvil, and the tensile strain energy stored in the drill string is quickly converted into kinetic energy, and is transmitted to the stuck point in the form of a stress wave, so that the stuck point produces a tension far exceeding the pre-tension force, so that the stuck drill string slides upward. After several shocks, the stuck drill string is out of the stuck point area. The understrike operation of the shock striker is similar and will not be repeated.
The main types of vibrators are drilling-while-drilling, salvage vibrators and ground vibrators. The vibrator while drilling should be designed in the drill string combination, and if it is stuck during drilling or lifting and lowering, it can be shocked and unstuck at any time. Salvage vibrators are only used to work in the well when they need to be unstuck, and they cannot work while drilling for a long time. The ground vibrator is only used at the wellhead, and its vibration effect on the stuck point is downward shock, which is more convenient to use on site.