Steel for drill pipe body suitable for arctic-alpine areas

A technology for drill pipe and pipe in alpine regions, applied in the direction of drill pipe, drill pipe, casing, etc., it can solve the problems of high ductile-brittle transition temperature, only about -30 ℃, unable to meet the operation requirements, etc., and achieve excellent low temperature toughness. Effect

Inactive Publication Date: 2011-05-25
SHANGHAI HILONG DRILL PIPE MATERIALS INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, due to the slightly poor hardenability, it is often impossible to harden through the thickened part of the drill pipe body (wall thickness 20-30mm), and its ductile-brittle transition temperature is higher, often only about -30°C, which cannot meet the conditions in the Arctic. Requirements for operations in alpine regions such as regions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The chemical composition designed according to the invention (for example, take C 0.28%, Si 0.20%, Mn 0.68%, P 0.012%, S 0.006%, Cr 0.86%, Ni 0.78%, Mo 0.30%, Al 0.018%) requires smelting , refining, continuous casting and rolling, rolled into a 5'×9.19mm, 9.2m long tube billet, and thickened to the size required by API (wall thickness about 24mm), after heat treatment, on the tube body and the thickened end Samples were taken for tensile testing and a series of low temperature impact tests. The results show that the properties of the pipe body are as follows: when the yield strength is 875MPa, the average impact energy (sample size 7.5×10mm) is 120J, and the ductile-brittle transition temperature is lower than -100℃. The performance of the thickened end is as follows: when the yield strength is 850MPa, the impact energy (sample size 10×10mm) is an average of 160J, and the ductile-brittle transition temperature is lower than -100°C.

Embodiment 2

[0031] According to the design of the present invention (for example, take C 0.25%, Si 0.28%, Mn 0.80%, Cr 0.95%, Ni 0.95%, Mo 0.15%, Ti 0.02%, Re 0.003%, Ca 0.008)) require smelting and refining , After continuous casting and rolling, roll into 5'×9.19mm, 9.2m long tube billet, and thicken to the size required by API (wall thickness is about 24mm), after heat treatment, take samples from the tube body and the thickened end Tensile test and series low temperature impact test. The results show that the properties of the pipe body are as follows: when the yield strength is 935MPa, the average impact energy (sample size 7.5×10mm) is 100J, and the ductile-brittle transition temperature is -100℃. The performance of the thickened end is as follows: when the yield strength is 905MPa, the impact energy (sample size 10×10mm) is an average of 120J, and the ductile-brittle transition temperature is -95°C.

Embodiment 3

[0033]According to the design composition of the present invention (for example, take C 0.23%, Si 0.24%, Mn 0.78%, P 0.006%, S 0.002%, Cr 0.86%, Ni 0.90%, Mo 0.55%, V0.08%) require smelting, After refining, continuous casting and rolling, it is rolled into a 5'×9.19mm, 9.2m long tube billet, and thickened to the size required by API (wall thickness is about 24mm). After heat treatment, samples are taken from the tube body and the thickened end Tensile tests and a series of low temperature impact tests were performed. The results show that the properties of the pipe body are as follows: when the yield strength is 995MPa, the average impact energy (sample size 7.5×10mm) is 85J, and the ductile-brittle transition temperature is -75°C. The performance of the thickened end is as follows: when the yield strength is 980MPa, the impact energy (sample size 10×10mm) is 100J on average, and the ductile-brittle transition temperature is lower than -70°C.

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Abstract

The invention relates to a kind of steel for the drill pipe body suitable for arctic-alpine areas. The steel comprises the following components by weight percent: 0.20-0.30% of C, 0.17-0.35% of Si, 0.60-1.0% of Mn, 0.015% or less of P, 0.008% or less of S, 0.7-1.0% of Cr and 0.75-1.0% of Ni. The steel also comprises two or more of 0.03% or less of Al, 0.10% or less of V, 0.6% or less of Mo, 0.03% or less of Ti, 0.03% or less of Re and 0.02% or less of Ca, and the balance Fe and inevitable trace elements. When the yield strength is 995MPa, the temperature is -60 DEG C, the longitudinal direction of the steel is detected and the size is 3 / 4, the Charpy impact energy is 85J, the fracture fibre rate is 100% and the ductile-to-brittle transition temperature is -75 DEG C.

Description

technical field [0001] The invention relates to a steel for a drill pipe body that can be used in alpine regions, and belongs to the technical field of petroleum and natural gas. Background technique [0002] With the development of the global economy, there is an increasing demand and dependence on energy represented by oil and natural gas. Energy plays a pivotal role in the development of the country and people's lives. Oil drilling has shifted from conventional drilling to harsher environments for more energy. The investigation report shows that the Arctic Circle is rich in oil and gas resources. The United States, Russia, Canada and other countries have successively allowed the exploitation of oil and gas resources in this alpine environment, but the temperature is as low as -60°C. If you want to work in these alpine areas, drilling The rod must have good low-temperature toughness (including two indicators of impact energy and ductile-brittle transition temperature) to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40E21B17/00
Inventor 袁鹏斌欧阳志英
Owner SHANGHAI HILONG DRILL PIPE MATERIALS INST
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