The BUMPER SPRING is a new tool from Odessa Separator that is specially engineered and designed to protect the integrity of the well when parted tubing or tailpipe falls to the bottom. Using a combination of friction and hydraulic mechanisms, the BUMPER SPRING absorbs and mitigates the impact caused by the weight of the assembly above it.
The Bumper Spring bull plug design uses fluid flow to center and maintain the stability of the falling BHA to prevent casing damage. When the bull plug encounters the casing liner, the Bumper Spring compresses, absorbing the impact generated by the weight and velocity of the falling equipment.
THE MECHANICS OF THE OSI BUMPER SPRING
1. The weight of the BHA attached above the Bumper Spring creates a downward force on the shear pin section of the tool. The shear pin section has three pins that shear at 9700 pounds of force.
2. When the pins shear, the perforated upper section falls into the lower section of the tool, where numerous stacked compression disks absorb the impact.
3. The perforations in the upper section allow fluid to flow out releasing the pressure, in the housing, created by fluid accumulation.
4. The plunger forces fluid downward into the center tube.
5. The fluid pushes back up creating a hydraulic force which decreases the velocity and lessens the impact.
The Bumper Spring is designed for wells with 7”
casing (26 lbs./ft. or lighter) and a 5-1/2” or 4-1/2” liner.