When lifting the elevator during the downhole process, the lift pipe should not exceed 0.2 meters, so as not to set up halfway, and it can be unsealed if the seat seal is lifted to a certain height.
When the elevator is removed during the downhole, the upper lift pipe shall not exceed 0.2 meters, so as not to sit in the middle, and find that a certain height of the lift pipe can be unsealed.
When removing the elevator in the process of running in the well, the tubing shall not be lifted up more than 0.2m, so as to avoid setting in the middle of the well. It is found that a certain height of the tubing lifted on the seat seal can be unsealed<br>