A kind of j55 steel grade large expansion rate welded pipe and its preparation method

An expansion rate, welded pipe technology, applied in the field of J55 steel grade large expansion rate welded pipe and its preparation, can solve problems such as large consumption, and achieve the effects of easy unwinding, shortened production cycle, and good strong plasticity.

Active Publication Date: 2019-01-25
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

J55 steel grade is an important oil casing steel grade in the American API Spec 5CT standard. It consumes a lot in the field of oil and gas exploration and development in my country. However, there is no J55 steel grade high expansion rate expandable pipe product with mature technology in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The chemical composition mass percentage of steel for welded pipe in this embodiment is: C: 0.04%, Si: 0.22%, Mn: 3.75%, Mo: 0.38%, V: 0.026%, S: 0.004%, P: 0.012%, and the balance is Fe and unavoidable impurities.

[0019] After the molten steel smelted in the converter and refined outside the furnace is treated with Ca, it is continuously cast into a slab. Continuous casting slabs are heated at 1150-1280°C and then rolled into strips. The final rolling temperature of the strips is higher than 830°C. After rolling, the strips are cooled to 725-650°C and coiled into coils.

[0020] After uncoiling, slitting, edge milling, forming, HFW welding and weld heat treatment, the seam welded pipe of φ193.7×7.3mm is made, and the weld seam is subjected to online normalizing heat treatment by medium frequency induction heating, and the induction heating temperature is 450~820 ℃, the heating time is 20-60s, and then the inner and outer flashes of the weld are trimmed, and the heig...

Embodiment 2

[0025] The mass percent of the chemical composition of steel for welded pipes in this example is: C: 0.08%, Si: 0.29%, Mn: 5.12%, Mo: 0.42%, V: 0.014%, S: 0.003%, P: 0.008%, and the balance is Fe and unavoidable impurities.

[0026] After the molten steel smelted in the converter and refined outside the furnace is treated with Ca, it is continuously cast into a slab. The continuous casting slab is heated at 1150-1280°C and then rolled into a strip. The final rolling temperature of the strip is higher than 830°C. After rolling, the strip is cooled to 725-650°C and coiled into a coil.

[0027] After uncoiling, slitting, edge milling, forming, HFW welding and weld heat treatment, the seam welded pipe of φ194×7.8mm is made. The weld seam is subjected to online normalizing heat treatment by medium frequency induction heating. The induction heating temperature is 450-820°C. The heating time is 20-60s, and then the inner and outer flashes of the weld are trimmed, and the height of t...

Embodiment 3

[0032] The chemical composition mass percent of steel for welded pipe in this embodiment is: C: 0.11%, Si: 0.18%, Mn: 2.96%, Mo: 0.39%, V: 0.04%, S: 0.008%, P: 0.011%, and the balance is Fe and unavoidable impurities.

[0033] The molten steel smelted in an electric furnace and refined outside the furnace is subjected to Ca treatment, and then continuously cast into slabs. The continuous casting slab is heated at 1150-1280°C and then rolled into a strip. The final rolling temperature of the strip is higher than 830°C. After rolling, the strip is cooled to 725-650°C and coiled into a coil.

[0034] After decoiling, slitting, edge milling, forming, HFW welding and weld heat treatment, the seam welded pipe of φ219.1×8.5mm is made, and the medium frequency induction heating is used for online normalizing heat treatment of the weld seam, and the induction heating temperature is 450~820 ℃, the heating time is 20-60s, and then the inner and outer flashes of the weld are trimmed, and...

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Abstract

The invention discloses a J55 steel grade welded tube with a high expansion rate, and a preparation method thereof. The chemical components of the welded tube with the high expansion rate comprise, by mass, 0.03%-0.12% of C, 0.15%-0.35% of Si, 2.5%-5.5% of Mn, 0.10%-0.50% of Mo, 0.01%-0.05% of V, no more than 0.01% of S, no more than 0.015% of P and the balance Fe and unavoidable impurities. The preparation method comprises the steps that the raw materials containing the chemical components are smelted into plate blanks, and then the plate blanks are rolled into coiled plates; the coiled plates are made into tube blanks through HFW and weld online heat treatment, then the tube blanks are thermo-mechanically rolled overall, and the thermo-mechanically rolled tube blanks are subjected to online controlled cooling treatment and gamma + alpha two-phase region insulation treatment to obtain the J55 steel grade welded tube with the high expansion rate finally; the method ensures that the longitudinal yield strength of the tube is 379-552 MPa, the tensile strength is more than 517 MPa, and the elongation is more than 15% after radial expansion deformation of no less than 20%; and the performances of the tube after expansion are effectively ensured to meet the API Spec 5CT-J55 standard requirements.

Description

Technical field: [0001] The invention belongs to the technical field of welded pipes, in particular to a J55 steel grade welded pipe with a large expansion rate and a preparation method thereof. Background technique: [0002] The single wellbore technology is also called "equal diameter drilling", which is to abandon the original casing sequence, use the technical characteristics of expandable pipes, replace the casing with expandable pipes, and run multiple stages of the same size expandable pipes in the wellbore And cementing, not only can effectively solve the problem of small liner size caused by the tapered well depth structure, which affects oil production capacity, but also can isolate complex formations without sacrificing the diameter of the wellbore, reducing the limit of the wellbore level The frictional resistance of displacement increases the drilling speed and greatly reduces the drilling and completion time. Expandable pipe products are divided into two types...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12B21C37/06
CPCB21C37/06C22C38/02C22C38/04C22C38/12
Inventor 李远征毕宗岳何石磊张峰韦奉梁航周新义刘新成黄晓江
Owner BC P INC CHINA NAT PETROLEUM CORP
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