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Line 143:
Line 143: + + − − [[file:well-completions_fig9.png|left|thumb|{{figure number|9}}Two perforating methods: (a) Perforating overbalanced with a casing gun and (b) perforating underbalanced with a thrutubing gun.]]
→Thru-tubing gun
====Thru-tubing gun====
====Thru-tubing gun====
[[file:well-completions_fig9.png|thumb|{{figure number|9}}Two perforating methods: (a) Perforating overbalanced with a casing gun and (b) perforating underbalanced with a thrutubing gun.]]
The guns that are run inside the tubing to perforate the casing are called thru-tubing guns. Typical thru-tubing guns range in diameter from 1–3/8 to 2–3/8 in. Because thru-tubing guns are much smaller than casing guns, smaller jet charges must be used; therefore, the resulting perforations are smaller in diameter and length, compared to a casing gun.
The guns that are run inside the tubing to perforate the casing are called thru-tubing guns. Typical thru-tubing guns range in diameter from 1–3/8 to 2–3/8 in. Because thru-tubing guns are much smaller than casing guns, smaller jet charges must be used; therefore, the resulting perforations are smaller in diameter and length, compared to a casing gun.
===Perforating methods===
===Perforating methods===