Well intervention

Frequently it simply involves rigging up to the kill wing valve on the Christmas tree and pumping in a fluid determined necessary for the particular well.

Scheduled annual maintenance may simply involve greasing and pressure testing the valve on the hardware.

It also requires an additional shear-seal BOP as a tertiary barrier, as the upper master valve on the Christmas tree can only cut slickline.

Braided line includes both the core-less variety used for heaving fishing and electric-line used for well logging and perforating.

Snubbing, also known as hydraulic workover, involves forcing a string of pipe into the well against wellbore pressure to perform the required tasks.