Welding method of casing for underground gas storage reservoir
A welding method and gas storage technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as unstable make-up, poor sealing performance, joint leakage, etc., to facilitate welder construction, ensure quality, and resist The effect of high internal pressure strength
Inactive Publication Date: 2019-03-05
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0005] Existing oil casings are all connected by threaded joints, which have disadvantages such as poor sealing performance, unstable make-up and easy overtightening, etc. Even the special air-tight threads have poor versatility among different manufacturers. There is still the problem of joint leakage caused by thread failure
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Embodiment 1
[0037] This embodiment relates to a welding method for casings used in underground gas storage, such as figure 2 As shown, it includes the following steps:
[0038] 1. The selection of casing, using a high-strength seamless steel pipe as a weldable casing (yield strength above 550MPa level, full-scale impact energy at 0°C ≥ 50J).
[0039] The seamless steel pipe (Baosteel's brand is BJ80) contains C: 0.03-0.1%, Si: 0.1-0.5%, Mn: 1.2-2.5%, Mo: 0.2-0.8%, S: less than 0.008%, and P : less than 0.02%, V: 0.03~0.12%, Ti: 0~0.03%, O: 0~0.01%, Cu: 0~0.3%, Ni: 0~0.12%; Pcm (suitable for low carbon microalloying element steel carbon equivalent) ≤ 0.24;
[0040] Pcm=C+Si / 30+Mn / 20+Cu / 20+Ni / 60+Cr / 20+Mo / 15+V / 10+5B, all element symbols in the formula represent the content of the element.
[0041] Steel pipe specification Φ244.5*11.99mm, tensile strength ≥621Pa; welded joint V-notch Charpy impact energy meets: full-scale average impact energy ≥30J.
[0042] 2. Prepare before welding, re...
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Abstract
The invention provides a welding method of a casing for an underground gas storage reservoir. The method comprises the following steps that pre-welding preparation is conducted, the edges of two oil casings are both provided with grooves through welding; the two oil casings are both preheated to 100 DEG C, and then bottoming welding is conducted in an argon arc welding mode; welding bead filling is conducted by adopting a manual arc welding method; the manual arc welding method is adopted for cover surface welding; and appearance detection and nondestructive testing are conducted in sequence.The method has the following beneficial effects that the welding method is adopted to replace threaded connection, due to the fact that the geological conditions are different, the stress states underwells are complex, stretching, pressing, bending and torsion stress are combined to act on casing bodies, a welding joint has higher strength and toughness relative to threads, the structural integrity of the metallurgical fusion connection ensures the sealing performance of oil gas and other media, so that the problem that oil casings with the traditional treaded connection are easy to slip in the case of repeated pulling and pressing is solved, and complex service conditions can be better satisfied.
Description
technical field [0001] The invention belongs to the field of material processing engineering (welding materials and technology), and is mainly used for welding casings in fields such as oil and gas. Background technique [0002] Oil casing is a special pipe in oil extraction engineering. After the drilling is completed, the casing supports the well wall, and the oil pipe transports crude oil and natural gas to the surface, and finally realizes oil and gas extraction. In this process, threaded joints are usually used to connect oil pipes and casings. [0003] Threaded joints are mainly divided into two categories, one is API standard threaded joints, which mainly include round threads and partial trapezoidal threads, which have disadvantages such as poor sealing performance, unstable make-up and easy overtightening. Another kind of threaded joint is a special threaded joint developed by various manufacturers, which generally has higher performance for certain specific workin...
Claims
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IPC IPC(8): B23K9/00B23K9/16B23K9/235
CPCB23K9/00B23K9/0026B23K9/16B23K9/235
Inventor 许轲刘耀恒王琍赵永安
Owner BAOSHAN IRON & STEEL CO LTD