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Wireline (cabling)
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===Pump-in sub=== the Pump-in subs (also known as a flow T) allow for the injection of fluid into the pressure control string. Normally these are used for wellsite pressure testing, which is typically performed between every run into the well. They can also be used to bleed off pressure from the string after a run in the well, or to pump in kill fluids to control a wild well. [[File:Wireline Grease-head.JPG|thumb|Wireline Greasehead used for pressure control]]
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