ABSTRACT
For a string with a packer, when the string is played out underground, the corresponding string deformation needs to be calculatedwith the packer re-opened. Corresponding to the threeways the packer can be seated, there are three corresponding ways to re-open it. Here, we only consider the mechanical and hydraulic re-opening processes. When the string is pulled upward by force F , the action on the packer is reduced, thus the reaction of the packer on the string is also reduced.The calculation begins at the packer, with the initial value being at the sealing stage with an addition of tension F (the downward direction is positive, so F is considered negative). The pressure and temperature distribution is not affected, so these remain the same as in the shut-in distribution condition. Similarly, for the hydraulic reopening process, pressure is only added in the pipe or the annulus, so for the shut-in case only the pressure distribution changes from the initial values.
