WCS Glossary
- Online Model
- Open Hole
- Operating Capacity
- Operating Limit
- Operating Point
- Operating Pressure
- Operator
- Optimization
- Optimizer
- Orifice
- Overburden
- Overshot
- Pack Off or Stripper
- Pack Off or Stripper Preventer
- Packer
- Packer Fluid
- Panhandle Formula
- Paraffin
- Parallel Operation
- Parasite (string, casing)
- Partial Pressure
- Parts Per Million (ppm)
- Pascal’s Laws
- Pay Zone
- Peak Shaving
- Penetration, Rate Of
- Perforate
- Perforating Gun
- Permeability
- Permissible Exposure Limit (PEL)
- Personal Protective Equipment (PPE)
- Ph
- PHA
- Piezometric Pressure
- Pig
- Pig (pigged)
- Pig Time
- Pill (or Pills)
- Pilot Hole
- Pilot Mill
- Pipe
- Pipe Leg
- Pipe Light/Pipe Heavy
- Pipe Prover
- Pipe Ram
- Pipe Work
- Piping and Instrumentation Diagram (P&ID)
- Piping & Instrumentation Diagram (P&ID)
- Pit Level
- Pit Volume Totalizer (PVT)