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High-performance seamless continuous pipe and manufacturing method thereof

A technology for seamless coiled tubing and a manufacturing method, applied in the field of oil and natural gas pipes, can solve problems such as pipe failure, and achieve the effects of reducing center segregation, ensuring high quality, and improving bending fatigue performance

Active Publication Date: 2019-08-30
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

This patent can improve the weld structure and weld performance, but the circumferential and longitudinal welds of the coiled pipe still exist, and the weld of the pipe body is still a weak zone compared with the base metal, and the position of the circumferential or longitudinal weld causes the failure of the pipe not fundamentally resolved

Method used

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  • High-performance seamless continuous pipe and manufacturing method thereof
  • High-performance seamless continuous pipe and manufacturing method thereof
  • High-performance seamless continuous pipe and manufacturing method thereof

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0031] Through the Φ73×3.8mm tube billet, three geometric shapes of CT90 steel grade high-performance seamless continuous tubes are manufactured. The main manufacturing steps are as follows:

[0032] The mass percentage of the chemical composition of the plate is as follows: C: 0.1%; Si: 0.35%; Mn: 0.5%; P: 0.005%; S: 0.0008%; Cu: 0.45%; Cr: 0.65%; 0.3%; Ti: 0.015%; Nb: 0.03%, the rest is Fe and unavoidable impurities.

[0033] 1. Pre-desulfurize the molten iron, smelt, alloy, LF+RH, and Ca, and continuously cast it into a slab with a thickness of 100mm; heat it to 1200°C for rough rolling, 780-860°C for finish rolling to 3.8mm, pickling, finishing Finishing and crimping are used for pipe making, and coiling is performed at 450-550°C.

[0034] 2. Coil slitting and lengthening

[0035] The coil is slit into steel strips with a width of 226mm, and the ends of the fro...

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Abstract

The invention discloses a high-performance seamless continuous pipe and a manufacturing method thereof. The method comprises the steps of preparing a continuous pipe dedicated board through processesof high-purity refining, continuous casting, thermal controlled rolling and controlled cooling, acid pickling and the like; preparing pipe blanks through rolled plate longitudinal shear, steel strip abut joint, cage-roll forming and high-frequency induction welding with protection gas; continuously producing equal-outer-diameter or variable-outer-diameter pipes through hot rolling reducing of thesame specification of pipe blanks; destressing the pipes to achieve the aims of reducing the pipe residual stress, improving the pipe toughness and reducing the pipe hardness, and obtaining the continuous pipe product with the good comprehensive property. The continuous pipe product meets the API standard need, through the hot rolling reducing technology, the pipe annular and longitudinal weldingjoint structure is obviously refined, and tends to be consistent with the base metal structure, physical seamlessness is achieved, the continuous pipe whole property can be effectively improved, the service life of the continuous pipe is prolonged, work safety of the continuous pipe is improved, the continuous pipe work technology advancing can be greatly pushed, and the market application prospect is wide.

Description

[0001] Technical field: [0002] The invention relates to the technical field of oil and gas pipes, in particular to a high-performance seamless continuous pipe and a manufacturing method thereof. [0003] Background technique: [0004] Coiled tubing (Coiled tubing, referred to as CT) is relative to conventional threaded tubing, also known as coiled tubing, flexible tubing, serpentine tubing or coiled tubing, which can be wound on a large-diameter reel and consists of several sections The steel strips are connected together, formed and welded to form oil and gas pipes with a length of several kilometers. Coiled tubing can be run in or out continuously and efficiently in oil wells, and is used in oilfield workover, drilling, completion, logging, stimulation, oil recovery, gas recovery and other fields. It runs through the whole process of oil and gas extraction, and its operating efficiency With unique advantages such as high efficiency, wide application range, and ability to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/42C22C38/44C22C38/50C22C38/48C21D8/10B23P15/00
CPCB23P15/00C21D8/105C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/50C22C38/58
Inventor 李鸿斌毕宗岳鲜林云刘云余晗赵勇汪海涛王维亮王亮李小龙刘玉栋孙文盛张高兰
Owner BC P INC CHINA NAT PETROLEUM CORP
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