Development of Steel Tube for Making of Hi-temperature/Hi-pressure Perforating Gun

Described here in the paper are the main aspects of the steel tube for making hi-temperature/hipressure perforating gun，including the major technical indexes，the steel type design，the manufacturing process flow， and the results from the mechanical property tests. Thanks to proper addition of alloying elements，namely，Cr，Mn， Mo，Nb and V etc.，chemical composition of the steel as melted is ensured. And the geometric dimensions，and the body anti-collapse strength of the perforator-purpose tube are guaranteed due to employment of the CPE push bench process， and the quenching-tempering treatment process with the hi-precision LOI furnace plus one-step straightening formation process. Relevant test results identify that the said perforator-purpose tube as developed are in possession of rather high anti-collapse strength and good impact toughness，having been satisfactory to the operation requirements for the perforating gun as used in oil/gas wells under the service conditions as the maximum temperature of 200 益 and the maximum pressure of 180 MPa.