Definition - What does Pullback mean?
Pullback is the final and most important stage of the horizontal directional drilling (HDD) process. Pullback operation starts after the bore-hole is completed and has been enlarged to the required diameter. After which, a pullback of the prefabricated product pipe into the enlarged hole can be completed. The pullback process is the most critical step of the HDD process.
Trenchlesspedia explains Pullback
In the pullback stage of trenchless construction, the pull section of the pipe is made up and supported by some combination of roller stands or pipe-handling equipment at the bore's exit side. When the reamer or bit exits the end of the bore, the pull section is attached to drill string behind the bottom hole or reaming assembly using a swivel. The pull section is then drawn through the bore's exit side toward the rig, using the bottom hole or reaming assembly.