Patent ID: 8746331

Claim:
A rust resistant well perforating gun for insertion into a well bore of a well, wherein the rust resistant well perforating gun comprises: a. a gun carrier comprising: (i) a gun wall annulus and an outer surface; (ii) a first threaded section formed in the gun wall annulus proximate a first end of the gun carrier, and a second threaded section formed in the gun wall annulus proximate a second end of the gun carrier; and (iii) a first seal bore formed in the gun wall annulus between the first threaded section and the first end of the gun carrier, and a second seal bore formed in the gun wall annulus between the second threaded section and the second end of the gun carrier; b. a charge loading tube configured to engage within the gun wall annulus, wherein the charge loading tube comprises: (i) a charge loading tube inner surface; (ii) a charge loading tube outer surface; (iii) a plurality of charge holes disposed through the charge loading tube; and (iv) a plurality of rear charge holes disposed through the charge loading tube, wherein each rear charge hole is concentrically aligned one of the charge holes; and c. a first end cap disposed on a first end of the charge loading tube, and a second end cap disposed on a second end of the charge loading tube, wherein the end caps have a diameter larger than the charge loading tube outer surface forming a gap between the charge loading tube outer surface and the gun wall annulus when the charge loading tube is engaged within the gun wall annulus, and wherein the rust resistant well perforating gun further comprises: (i) a first coating disposed over the gun carrier, a second coating disposed over the charge loading tube, and a third coating disposed over the end caps, wherein the first coating, the second coating, and the third coating are each configured to prevent rust; (ii) a first gripping surface formed on the outer surface of the gun carrier proximate the first end of the gun carrier and a second gripping surface formed on the outer surface of the gun carrier proximate the second end of the gun carrier; or (iii) both the first coating disposed over the gun carrier, the second coating disposed over the charge loading tube, and the third coating disposed over the end caps, wherein the first coating, the second coating, and the third coating are each configured to prevent rust and the first gripping surface formed on the outer surface of the gun carrier proximate the first end of the gun carrier and the second gripping surface formed on the outer surface of the gun carrier proximate the second end of the gun carrier.