![]() The scallop also may minimize the metal thickness penetrated, although this affects the perforation charge performance less than 10%. The scallop contains the exit burr from the charge firing, which prevents scoring of polished bores if the gun is moved after firing and may minimize gun swelling. There is usually a “scallop” spot milled in the outside of the hollow-carrier tube at the charge location. Single-use guns are designed as expendables because the shaped charge perforates through the gun body. Both reusable and single-use guns are offered, although higher pressure and more expensive wells typically use the single-use guns to minimize leaks and problems. The guns may be of a small size, able to pass through tubing and restrictions and place initial perforations or add perforations, or of larger sizes that are run through casing, conveyed by either work strings or the production tubing. Hollow-carrier guns are tubes that contain the shaped charges. The carrier contains most of the debris from the charge and the alignment system. They may carry large charges, which normally minimize casing damage. Hollow-carrier guns can be run either on wireline or on tubing. 1-Gun swell after firing in a low-pressure test. diameter or less, whereas larger guns, because of the increased resistance to bending with increasing diameter, show no evidence of bowing.įig. Gun bowing is often noted in small guns of 2 1/8 in. 1 shows a gun swell after firing in a low-pressure test. guns shot in low pressure wells to less than 1% diameter growth in larger guns and those shot at high pressure. Gun body swell ranges from approximately 10% diameter growth in small, 1 11∕16 -in. In wells in which clearances between the gun and tubulars are critical, the amount of distortion of the gun should be determined from the service company before the gun is used. ![]() On the larger diameter, thick-walled guns, there is much less distortion than on the small, thin-walled through-tubing guns. In shaped-charge perforators, there are two basic carriers: ![]()
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