1. Tubing Pup Joints
These short steel tubes are used in production tubing strings between regular tubing joints. Typical lengths are 2 ft to 10 ft.
- Enabling accurate landing of production packers.
- Adjusting tubing string lengths based on pressure testing results.
- Spotting gels or pills during well interventions.
- Isolating zones for selective perforation.
- Facilitating workover operations by providing space-out flexibility.
- Pulling or running completion assembly components like subsurface safety valves.
2. Casing Pup Joints
It is short steel pipes inserted in between regular casing string sections. Typical lengths range from 2 ft to 10 ft.
- Enabling precise landing of casing shoes at target depths.
- Adjusting the overall string length to accommodate depth variations.
- Installing temporary plugs during well abandonment.
- Circulating bottoms up after casing cementing.
- Relieving debris collected on casing shoe seats.
- Providing flexibility in running long casing strings.
- Facilitating casing liner laps.
3. Drill Pipe Pup Joints
These are short steel pipes used in the drill string between regular drill pipe joints. Lengths range from 2 ft to 10 ft.
- Accurately landing BHA equipment like stabilizers, MWD tools, LWD sensors, mud motors, etc. at required depths.
- Circulating bottoms up to clean holes after drilling or cementing operations.
- Run pressure tests across formations using a joint to isolate zones.
- Break circulation during stuck pipe incidents and attempt to spot fluids across short intervals.
- Free stuck drill strings by repetitive downward jarring with pups installed.
- Enable cutting and retrieving the fish when fishing for fallen drill string components.
4. Integral Pup Joints
- Adjusting the drill string length for precise BHA positioning.
- Bridging gaps between drill pipe joints of marginally different lengths.
- Assisting fishing and jarring operations.
- Facilitating drill string assembly and handling at rig sites.
