According to the previous post (piston force on open-ended tubular), applied surface pressure will reduce tensile force on surface. In this article, this is an analysis on the piston force on a plugged tubular string and the details are shown below;
Tubing Detail
- 5” Tubing
- ID of tubing = 3.696”
- Packer seal bore OD = 5.25”
- Weight per length = 17.7 lb/ft
- Total Length = 10,000 ft
- Plugged tubing depth = 10,000 ft
- Fluid density = 10 ppg
- Tubing is free to move in the packer
- Applied surface pressure = 5,000 psi
Figure 1 shows the wellbore schematic. Applied pressure (5,000 psi) will cause a piston effect to push the tubing. Therefore, at the bottom of tubing buoyancy and piston force will act in an upwards direction (compression).
Figure 1 – Wellbore Schematic
