A quenched and tempered high-quality coiled tube and its manufacturing method
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A manufacturing method and technology for coiled tubing, applied in manufacturing tools, furnace types, furnaces, etc., can solve the problems affecting the bending fatigue life of coiled tubing products of the whole coil, and the difference in weld structure, etc., to increase the service life and work safety. , Reduce the center segregation, improve the bending fatigue performance and the effect of stress corrosion resistance
Active Publication Date: 2021-11-16
BC P INC CHINA NAT PETROLEUM CORP +1
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This patent can improve the weld structure and weld performance, but there is still a large difference between the weld structure and the base metal structure, which affects the bending fatigue life of the coiled tubing product
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Embodiment 1
[0061] Embodiment 1, Embodiment 2 and Embodiment 3 were quenched, stress relieved and tempered according to the process shown in Table 5. Specifically take embodiment 1 as an example to illustrate:
[0062] Table 5 Quenching, stress relief and tempering treatment of pipe body
[0063]
[0064] Tube body quenching treatment: The tube blank is rapidly heated at a rate of 20-50°C / s by a composite heating method combining an intermediate frequency heating furnace and a muffle furnace. The heating temperature is A c3 +(30~50)℃, where Ac3=910-203[C%]1 / 2+44.7[Si%]+104[V%]+31.5[Mo%]
[0065] =910-203×0.21 / 2+44.7×0.28+104×0.05+31.5×0.3=846 The final tube heating temperature is 885°C. The heating time is t, t=A×δ=1.5×4.8=7.2≈7min, quenching is carried out after heating, the quenching medium is water, and the quenching termination temperature is room temperature.
[0066] Pipe body stress relief treatment: After drying the surface of the pipe body with cold air, quickly heat it to...
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Abstract
The invention discloses a quenched and tempered high-quality coiled tubing and a manufacturing method thereof, including: steel plate uncoiling, leveling, steel strip cutting, steel strip welding to form continuous strip steel, butt weld flaw detection, and steel strip winding on a drum , forming, welding, removing external burrs, induction heating, pipe body quenching, pipe body drying, sizing, pipe body stress relief treatment and crimping, whole coil offline tempering treatment, pipe rewinding, inspection and anticorrosion, cutting, overall Pressure test. The performance of the hot-rolled coil used in the present invention is relatively low, and the tube forming is easy. Through the subsequent quenching and tempering heat treatment of the whole tube, high-strength and ultra-high-strength continuous tube products can be developed; at the same time, the tube blank after quenching and tempering Quenching and tempering treatment process enables the base metal, circumferential weld and longitudinal weld of the pipe to achieve deep heat treatment at the same time, ensuring that the pipe body has as uniform a tempering structure as possible and low residual stress, so as to truly realize the weld and base metal. Organizations converge.
Description
Technical field: [0001] The invention relates to the technical field of oil and gas pipes, in particular to a quenched and tempered high-quality continuous pipe and a manufacturing method thereof. Background technique: [0002] 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 operate...
Claims
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