Continuous pipe resistant to H2S corrosion and manufacturing method thereof

A manufacturing method and technology for coiled tubing, which are applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc., can solve the problems of overall mechanical properties decline, coiled tubing failure, structural defects, etc., and achieve the formation and expansion of cracks. Optimize the heat treatment process and reduce the effect of band segregation

Inactive Publication Date: 2016-08-10
BAOJI PETROLEUM STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of a large number of banded tissues, it is easy to produce tissue defects, and under the action of external force, stress concentration occurs, resulting in a decrease in overall mechanical properties
When the coiled tubing is used in an acidic environment, the defect will become a H accumulation site. When the H partial pressure reaches or exceeds the material strength, cracks will be generated and expanded, causing the coiled tubing to fail.

Method used

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  • Continuous pipe resistant to H2S corrosion and manufacturing method thereof
  • Continuous pipe resistant to H2S corrosion and manufacturing method thereof
  • Continuous pipe resistant to H2S corrosion and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]

[0038] The steel designed with the above composition is rolled into a steel coil with a size of 1100×3.18mm, a weight of 20t, and a length of about 700m.

[0039] The main properties of the steel: yield strength 550MPa, tensile strength 642MPa, elongation 34%, hardness 228HV 0.5 . The grain size is at ASTM E112NO.11 level, and the band structure is at level 1.0.

[0040] 2) Slitting the steel coil into 9 steel strips with a width of 120.2 mm. The steel belts are butted into a steel belt with a total length of 6300 meters. A steel pipe with a size of Φ38.1×3.18mm is formed by a row of rollers. After heat treatment of the weld seam and stress relief treatment of the whole pipe body, a plate of 4000 meters long H 2 S corrodes coiled tubing products.

[0041] The main properties of the coiled tubing: the yield strength is 595MPa, the tensile strength is 668MPa, and the maximum hardness is 232HV 0.5 . organizational profile see Picture 1-1 and Figure 1-2 .

[...

Embodiment 2

[0048]

[0049] The steel designed with the above composition is rolled into a steel coil with a size of 1120×4.0mm, a weight of 20t, and a length of about 570m.

[0050] The main properties of the steel: yield strength 470MPa, tensile strength 575MPa, elongation 32%, hardness 219HV 0.5 . The grain size is at ASTM E112 NO.11 level, and the band structure is at level 1.0.

[0051] 2) The steel coil was longitudinally cut into seven steel strips with a width of 158.1 mm. The steel belts are butted into a steel belt with a total length of 3990 meters. A steel pipe with a size of Φ50.8×4.0mm is formed by a row of rollers. After heat treatment of the weld seam and stress relief treatment of the whole pipe body, a 3500-meter-long H 2 S corrodes coiled tubing products.

[0052] The main properties of the coiled tubing: the yield strength is 515MPa, the tensile strength is 595MPa, and the maximum hardness is 226HV 0.5 . organizational profile see Pic 4-1 and Figure 4-2 . ...

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Abstract

The invention discloses a continuous pipe resistant to H2S corrosion and a manufacturing method thereof. The continuous pipe comprises following material by mass percent such as C of 0.03-0.06 %, Si less than or equal to 0.152 %, Mn of 0.15-0.55%, P less than or equal to 0.01, S less than or equal to 0.003, Cr of 0.2-0.6 %, Mo less than or equal to 0.02, Ni of 0.1-0.27%, V of less than or equal to 0.06%, Ti of less than or equal to 0.03%, Nb of 0.05-0.09%, and the balance Fe. The continuous pipe resistant to H2S corrosion helps to solve the problem that an existing steel continuous pipe loses efficacy at a quick pace in an acid environment.The low-carbon low-manganese continuous pipe resistant to H2S corrosion has great intensity, plasticity and corrosion resistance.While meeting the mechanical properties of tubular products in the first place, banded segregation of parent material is substantially reduced by the low-carbon low-manganese alloying composition design so that defects are effectively reduced and H collection is prevented. The formation and expansion of cracks do not easily occur so that corrosion resistance of tubular products is remarkably improved. In the meantime, residual stress of tubular products by optimizing weld seams and carrying out thermal processing technology of parent material so that corrosion resistance is further enhanced.

Description

Technical field: [0001] The invention belongs to the technical field of petroleum and natural gas pipes, and relates to H 2 S corrosion coiled tubing manufacturing technology. Background technique: [0002] Coiled tubing is a new type of oil pipe with high strength, high toughness, and a single length of several thousand meters. It is made of carbon steel and welded by coiled plates. It is called "universal pipe" in fields such as wells and oil and gas transportation. [0003] At present, due to the presence of H in most oil and gas wells at home and abroad 2 For S corrosive media, when ordinary steel coiled tubing is used in downhole operations, the coiled tubing is prone to hydrogen-induced cracking, causing the string to break, which may cause major economic losses or safety accidents. The main reason is that when steel is in an aqueous solution containing hydrogen sulfide, hydrogen is absorbed in the steel due to electrochemical corrosion, and hydrogen atoms gather in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02C22C38/50B21C37/08
CPCF16L9/02B21C37/08C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 毕宗岳张晓锋余晗张锦刚鲜林云李鸿斌汪海涛张国超晁利宁王维亮
Owner BAOJI PETROLEUM STEEL PIPE
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