Manufacturing method of high-strength and high-plasticity continuous tube

A manufacturing method and plastic-toughness technology, which is applied in the field of high-strength high-plastic-toughness coiled tubing, and can solve problems such as unmatched coiled tubing manufacturing technology

Active Publication Date: 2010-12-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many patents for coils for coiled tubing, but they are not compatible with coiled tubing manufacturing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mass percentage of chemical composition of coiled tubing material:

[0020] C:0.05%;Si:0.21%;Mn:1.75%;P:0.007%;S:0.004%;Cr:0.20%;Mo:0.18%;Ni:0.12%;Cu:0.10%;V:0.05%; Ti: 0.02%; Al: 0.03%; Ca: 0.002%; Fe: balance.

[0021] Manufacturing of coiled tubing:

[0022] First, prepare hot-rolled coils: the above-mentioned materials (each component) are smelted in an oxygen-blown converter, treated with Ca, refined outside the furnace, vacuum degassed, continuously cast into a thick slab with a thickness of about 100mm, and then heated to about 1200 ℃, rough rolling at 1000-1100 ℃, finish rolling at 750-950 ℃, cooling rate after rolling 15-20 ℃ / s, coiling temperature 550-600 ℃, and a thickness of 2.4 mm hot-rolled coils.

[0023] Coil slitting and butt welding: Cut the prepared hot-rolled coils into 75mm steel strips through a slitting machine. In order to reduce the influence of segregation on subsequent pipe welding, slitting from 1 / 2 of the coil width should be avoided . ...

Embodiment 2

[0028] Mass percentage of chemical composition of coiled tubing material:

[0029] C: 0.07%; Si: 0.31%; Mn: 1.55%; P: 0.007%; S: 0.004%; Cr: 0.25%; Mo: 0.16%; Ni: 0.17%; %; Cu: 0.19%; Nb: 0.04%; Al: 0.02%; Ca: 0.003%;

[0030] Manufacturing of coiled tubing:

[0031] First, prepare hot-rolled coils: the above-mentioned materials (each component) are smelted in an oxygen-blown converter, refined outside the furnace, vacuum degassed, continuously cast into a thick slab with a thickness of about 100 mm, and then heated to about 1200 ° C. Rough rolling is carried out at 1000-1100°C, finish rolling is carried out at 730-950°C, the cooling rate after rolling is 20-30°C / s, and the coiling temperature is 550-600°C to make a hot-rolled sheet with a thickness of 4mm and excellent comprehensive performance. plate roll.

[0032] Coil slitting and butt welding: The prepared hot-rolled coil is cut into a 135mm steel strip by a slitting machine. In order to reduce the influence of segrega...

Embodiment 3

[0037] Mass percentage of chemical composition of coiled tubing material:

[0038] C: 0.12%; Si: 0.35%; Mn: 1.45%; P: 0.007%; S: 0.005%; Cr: 0.31%; Mo: 0.17%; Ni: 0.19%; %; Cu: 0.17%; Nb: 0.04%; Al: 0.03%; Ca: 0.003%;

[0039] The manufacturing process of the coiled tubing is the same as in Example 2.

[0040]After welding, perform an overall sub-temperature quenching at 750-780°C and tempering at 500-650°C. In order to obtain the ideal duplex structure with fine ferrite and a small amount of pearlite.

[0041] The main technical indicators of coiled tubing: the yield strength reaches 595MPa, the tensile strength reaches 670MPa, the elongation rate is 37%, and the highest hardness is HRC22. And has good field welding performance and corrosion resistance.

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Abstract

The invention relates to a manufacturing method of a high-strength and high-plasticity continuous tube. The continuous tube comprises the following chemical components in mass percentage: 0.05-0.12% of C, 0.17-0.37% of Si, 0.60-1.75% of Mn, not more than 0.010% of P, not more than 0.005% of S, 0.20-1.0% of Cr, 0.15-0.45% of Mo, 0.10-0.35% of Ni, 0-0.05% of V, 0-0.03% of Ti, 0.10-0.25% of Cu, 0-0.07% of Nb, 0.02-0.04% of Al, 0.002-0.004% of Ca and the balance of Fe. The manufacturing method comprises the following steps: manufacturing hot-rolled steel coils; longitudinally shearing and butt-welding the steel coils; and producing a straight seam electric-resistance-welded steel tube by using steel bands and welding to obtain welding seams by normalization at the temperature of 930-960 DEG C. Yield strength of the continuous tube reaches 490-800MPa and elongation percentage thereof reaches 28-40%.

Description

technical field [0001] The invention relates to a high-strength, high-plastic-toughness (yield strength reaches 490-800MPa, elongation 28-40%) coiled pipe manufacturing method, which is used for oil and gas well drilling or downhole operations in the oil and gas industry. Background technique [0002] Coiled tubing technology has been widely used in the world petroleum industry because of its considerable technical advantages and operational advantages. Especially in recent years, with the implementation of the global cost reduction strategy, coiled tubing has significantly superior It plays an increasingly important role in oil and gas field exploration and development, and has a broader application prospect in oil and gas field exploration, development, drilling, completion, workover, and operations. [0003] At present, more than 20 sets of coiled tubing machines owned by our country are all imported from the United States, Canada and other countries, and the price is ver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 冯耀荣上官丰收宋生印杨龙
Owner BC P INC CHINA NAT PETROLEUM CORP
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