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. |