Steel grades below 150ksi produced by CPE units are CO resistant 2 Preparation process for corroded oil well pipes
A preparation process and technology for oil well pipes, which are applied in the field of steel for oil well pipes
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Embodiment 1
[0029] The steel pipe finished product specifications of the present embodiment:
[0030] Tube specifications:
[0031] Tube blank material: 5Cr;
[0032] Anti-CO produced by CPE unit 2 The general steps of the manufacturing process of corroded oil well pipe are: peeling of tube blank → tube blank cutting, cold centering → tube blank preheating → ring furnace heating → tube blank piercing → capillary tube piercing mandrel, necking → pipe jacking → loose rod →Rod stripping→Hot sawing→Reheating→Phosphorization removal by high pressure water→Tension reduction→Cooling bed cooling→Inspection and grinding→Pickling→Reinspection and grinding→Lubrication, phosphating→Cold rolling→Quenching and tempering heat treatment→Straightening→ Finishing→Packing into storage.
[0033] The preparation process of the anti-CO2 corrosion oil well pipe produced by the CPE unit, the specific steps of the process are as follows:
[0034] (1) According to the mass percentage ratio of each componen...
Embodiment 2
[0056] The anti-CO produced by the CPE unit of this embodiment 2 The preparation process of the corroded oil well pipe is basically the same as that of the first embodiment, the difference is that in the step (1), its components and the mass percentages of each component are as follows:
[0057] C: 0.16%; Si: 0.3%; Mn: 0.85%; Cr: 5.29%; Mo: 0.45%; Al: 0.031%; Ni: 0.18%; 100%.
[0058] The anti-CO prepared by the process of this embodiment 2 The corroded oil well pipe reaches 110ksi steel grade, with high dimensional accuracy and good surface quality. The mechanical properties are as follows: yield strength 861MPa, tensile strength 950MPa, and elongation 15%.
Embodiment 3
[0060] The anti-CO produced by the CPE unit of this embodiment 2 The preparation process of the corroded oil well pipe is basically the same as that of the first embodiment, the difference is that in the step (1), its components and the mass percentages of each component are as follows:
[0061] C: 0.18%; Si: 0.2%; Mn: 0.8%; Cr: 5.0%; Mo: 0.05%; Al: 0.02%; B: 0.0005%;
[0062] The anti-CO prepared by the process of this embodiment 2 The corroded oil well pipe reaches 130ksi steel grade, with high dimensional accuracy and good surface quality. The mechanical properties are as follows: yield strength 972MPa, tensile strength 1051MPa, and elongation 16%.
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