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Figure 20  Types of perforating gun.

                 Perforating guns are classified as hollow steel carrier, semi
            expendable, and fully expendable guns (Fig. 20). Hollow steel carrier
            guns are made of steel cylinders that carry the explosive charges and
            needed accessories. They come in small diameters that can go through the
            production tubing, and in large diameters that can go only through the
            production casing. They are rigid, can withstand high pressure and






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