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Steel for sucker rod, and making method of sucker rod

A manufacturing method and a sucker rod technology are applied in the field of petroleum exploitation equipment to achieve the effects of improving high-temperature oxidation resistance, improving corrosion resistance, and improving service coefficient

Active Publication Date: 2016-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the material of the sucker rod in the prior art cannot make the sucker rod have both corrosion resistance and high strength performance, the embodiment of the present invention provides a steel for the sucker rod and a method for manufacturing the sucker rod

Method used

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Embodiment 1

[0021] The embodiment of the present invention provides a steel for sucker rods and a method for manufacturing the sucker rods. The chemical composition of the steel for sucker rods is: carbon, silicon, manganese, chromium, molybdenum, aluminum, copper, phosphorus, sulfur, Nickel and iron, 0.30% by weight carbon, 0.25% by weight silicon, 1.20% by weight manganese, 2.1% by weight chromium, 0.20% by weight molybdenum, 0.40% by weight aluminum %, the weight percentage of copper is 1.1%, the weight percentage of phosphorus is 0.019%, the weight percentage of sulfur is 0.015%, the weight percentage of nickel is 0.020%, and the balance is iron.

[0022] The manufacturing method includes putting the steel for sucker rods into an electric furnace for initial smelting at a temperature of 1540°C, refining in a refining furnace at a refining temperature of 1580°C, and drawing the steel in a continuous casting machine to obtain a billet. Carry out flaw detection inspection on the drawn bi...

Embodiment 2

[0025] The embodiment of the present invention provides a steel for sucker rods and a method for manufacturing the sucker rods. The chemical composition of the steel for sucker rods is: carbon, silicon, manganese, chromium, molybdenum, aluminum, copper, phosphorus, sulfur, Nickel and iron, 0.28% by weight carbon, 0.20% by weight silicon, 1.10% by weight manganese, 2.0% by weight chromium, 0.15% by weight molybdenum, 0.30% by weight aluminum %, the weight percentage of copper is 1.0%, and the balance is iron.

[0026]The manufacturing method includes putting the steel for sucker rods into an electric furnace for initial smelting at a temperature of 1540°C, refining in a refining furnace at a refining temperature of 1580°C, and drawing the steel in a continuous casting machine to obtain a billet. Carry out flaw detection inspection on the drawn billet, cut to length after passing the flaw detection inspection to make a formed sucker rod billet, and roll the sucker rod billet int...

Embodiment 3

[0029] The embodiment of the present invention provides a steel for sucker rods and a method for manufacturing the sucker rods. The chemical composition of the steel for sucker rods is: carbon, silicon, manganese, chromium, molybdenum, aluminum, copper, phosphorus, sulfur, Nickel and iron, 0.33% by weight carbon, 0.40% by weight silicon, 1.50% by weight manganese, 2.5% by weight chromium, 0.25% by weight molybdenum, 0.70% by weight aluminum %, the weight percentage of copper is 1.5%, the weight percentage of phosphorus is 0.020%, the weight percentage of sulfur is 0.020%, the weight percentage of nickel is 0.030%, and the balance is iron.

[0030] The manufacturing method includes putting the steel for sucker rods into an electric furnace for initial smelting at a temperature of 1540°C, refining in a refining furnace at a refining temperature of 1580°C, and drawing the steel in a continuous casting machine to obtain a billet. Carry out flaw detection inspection on the drawn bi...

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Abstract

The invention discloses a steel for a sucker rod, and a making method of the sucker rod, and belongs to the field of petroleum exploitation apparatuses. The steel for the sucker rod comprises carbon, silicon, manganese, chromium, molybdenum, aluminum, copper, phosphorus, sulfur, nickel and iron. The making method comprises the following steps: machine-shaping the steel for the sucker rod, forging the steel, quenching and tempering the forged steel, carrying out heat straightening to obtain a sucker rod blank, carrying out shot blasting treatment on the surface of the sucker rod, and processing a screw thread on the surface of the sucker rod blank to make the sucker rod. Proper amounts of elements are added to iron in the steel for the sucker rod, so the corrosion resistance and the strength of the sucker rod are improved, especially the corrosion resistance to hydrogen sulfide and chloride ions is improved, thereby the life of the sucker rod is prolonged, and the petroleum exploitation cost is reduced. The making method adopts an aqueous solution of sodium chloride as a medium to cool, so the sucker rod made in the invention is uniformly quenched, and the quenching cracks of the sucker rod are reduced.

Description

technical field [0001] The invention relates to the field of oil exploitation equipment, in particular to a steel for a sucker rod and a method for manufacturing the sucker rod. Background technique [0002] The sucker rod is a slender rod of the pumping well. The sucker rod is made of multiple single sucker rods connected by threads. The sucker rod is connected to the polished rod on the top and the pump to transmit power. One of the important consumable materials in mining activities. [0003] In the process of oil extraction, hydrogen sulfide gas generally exists in the well fluid, and in the later stage of oilfield development, it is necessary to inject hydrochloric acid into the formation for fracturing and acidification to increase oil production, which will cause a high content of chloride ions in crude oil. However, the sucker rod works in a high-temperature, wet hydrogen sulfide and chloride ion corrosion environment, and the sucker rod is subjected to asymmetric c...

Claims

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Application Information

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IPC IPC(8): C22C38/44C21D8/06
Inventor 吴永正潘洪国马光合贺国伟谢海玮贾波刘林
Owner PETROCHINA CO LTD
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