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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;
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).
Piston force is a load caused directly by changes in pressure acting on the exposed cross sectional area of pipe. This results in changing in length of tubular and force acting against tubular. In this article, it generally demonstrates force distribution based on a simple tubular diagram.