Bearing-free self-positioning perforating gun for wellbore operations

A perforating gun comprising:

• a shaped charge positioning tube concentrically received within an outer gun barrel, the shaped charge positioning tube being freely rotatable with respect to the outer gun barrel;
• first and second contact housings coupled to opposing ends of the shaped charge positioning tube and including respective first and second electrical connector plugs protruding axially therefrom for engaging first and second tandems, respectively;
• a grounding collar disposed between the shaped charge positioning tube and the outer gun barrel for creating an electrical connection to ground, wherein the grounding collar is fixedly attached to the shaped charge positioning tube and includes a plurality of resilient fingers extending radially therefrom in sliding engagement with the outer gun barrel;
• and
• an asymmetric weight coupled to the shaped charge positioning tube for achieving a desired angular orientation of the shaped charge positioning tube when inclined from vertical.

A perforating gun comprising:

• an outer gun barrel including a cylindrical sidewall having an inner surface;
• a shaped charge positioning tube received within the outer gun barrel, the shaped charge positioning tube having an outer surface that is spaced apart from the inner surface of the outer gun barrel such that an annular gap exists therebetween;
• first and second contact housings coupled to opposing ends of the shaped charge positioning tube and including respective first and second communication pins protruding axially therefrom;
• and
• an arming plunger within an axial opening in at least one of the first and second contact housings, the arming plunger being movable between a raised position and a lowered position, the arming plunger being spring-biased in the raised position for creating an electrical connection to ground,
• wherein the shaped charge positioning tube is freely rotatable with respect to the outer gun barrel, the shaped charge positioning tube including an asymmetric weight for achieving a desired angular orientation when the perforating gun is inclined from vertical.

A perforating gun comprising:

• an outer gun barrel including a cylindrical sidewall having an inner surface;
• a shaped charge positioning tube received within the outer gun barrel, the shaped charge positioning tube having an outer surface that is spaced apart from the inner surface of the outer gun barrel such that an annular gap exists therebetween;
• first and second contact housings coupled to opposing ends of the shaped charge positioning tube and including respective first and second communication pins protruding axially therefrom;
• and
• first and second spring-biased grounding pins within an axial opening in respective ones of the first and second contact housings, the first and second spring-biased grounding pins being radially offset from the first and second communication pins, wherein the shaped charge positioning tube is freely rotatable with respect to the outer gun barrel, the shaped charge positioning tube including an asymmetric weight for achieving a desired angular orientation when the perforating gun is inclined from vertical.