Perforating gun barrel material and preparation method thereof

Abstract

The invention discloses a perforating gun barrel material and a preparation method thereof. The perforating gun barrel material comprises, by mass, 0.25%-0.35% of C, 0.15%-0.35% of Si, 0.4%-0.8% of Mn, 0.8%-1.2% of Cr, 0.15%-0.45% of Mo, 0.005%-0.05% of Al, no more than 0.15% of Cu, no more than 0.2% of Ni, no more than 0.06% of V, no more than 0.05% of Nb, no more than 0.03% of Ti, 0.001%-0.0065%of Ca, less than 0.015% of P, less than 0.0065% of S and the balance Fe and inevitable impurities. Ca and S meets the condition that Ca / S is larger than 1, Ceq is larger than 0.6 and smaller than orequal to 0.72, and Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Cu+Ni) / 15. A perforating gun barrel produced through a water quenching method is excellent in performance, and the production cost is reduced obviously.

Description

technical field [0001] The invention relates to a seamless steel pipe material and a preparation method thereof, in particular to a gun barrel steel pipe material and a preparation method thereof, which are applied in the technical field of perforation completion in petroleum exploration and development system engineering. Background technique [0002] Perforation completion is an extremely important technology in petroleum exploration and development system engineering, and it is one of the important means to improve the recovery of oil and gas wells. The perforating barrel is the main part of the perforating gun. During the perforating blast, the barrel bears a large impact force, and the high-temperature and high-pressure gas blasts the thinnest blind hole on the perforating barrel and shoots it to the steel pipe and In the cement layer, the energy-gathering high-temperature and high-pressure gas penetrates the steel pipe and the cement layer to explode the formation. It ...

AI Technical Summary

Problems solved by technology

This kind of water quenching at a high temperature of 900 °C has a large quenching stress and poor perforation performance of the barrel, which cannot be compared with oil quenched barrels.

[0005] Patent CN201510234477.0 discloses a high-grade steel perforating barrel and forming method, see Table 4, the carbon content is lower, and the Mo content is about 1.0, which is expensive and contains alloy elements such as W, at 880-920 It is very easy to bend after water quenching at ℃ temperature, and the production is extremely difficult

Patents CN201210351209.3 and CN201310641736.2 disclose a perforating gun barrel material containing rare earth, see Table 4, the same quenching temperature is 880-900°C, the patent does not specify whether to adopt oil quenching or water quenching, but, At this temperature, it is inevitable to face the unfavorable factors such as heavy environmental load of oil quenching, and easy bending and cracking of water quenching.

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