I wanted to share a bit about a recent project on a large structure we analyzed. The drilling rig above had some parameters that we had taken a look at with the following load conditions:
- 325 kips for pipe setback weight
- 450 kips for rotary table load
- 150 kips for derrick weight
- 900 kips for block load
- 112 mph wind load
Notice the setback pipe. This is the pipe that is stored next to the rig, and it is ready for re-introduction into the well. The maximum stress and deflection is 325,000 pounds from this pipe!
This is made up of 2-3 joints of pipe and saves technicians time by leaving it in close proximity to use again. It’s a better alternative to taking it apart and putting it on the ground.
The rotary table absorbs the load of the pipe string as it is drilling. The block load is a vertical load from lifting 900,000 pounds with the derrick block!
We have also analyzed the derrick, but not all at once. Note that this is called a sub base and is modular in order to move it on standard flat bed trucks.
There is a sequence we use to approach the analysis based on collaboration with our clients and understanding of all the conditions.
I just wanted to share some insights into our projects and how we work the problems. Very fun stuff.