Oil pumping polish rod

A kind of oil sucking polished rod and surface polishing technology, applied in drill pipe, coating, metal material coating process, etc., can solve the problem of lack of fatigue resistance, achieve low fatigue resistance, meet environmental requirements, and improve corrosion resistance Effect

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high strength does not mean high fatigue resistance, and the steel materials currently used are deficient in fatigue resistance to varying degrees.

Method used

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  • Oil pumping polish rod
  • Oil pumping polish rod

Examples

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Effect test

preparation example Construction

[0034] (2) Preparation of the oil sucker polished rod blank: the obtained low alloy steel bar is cold drawn to the standard length of the oil sucker polished rod of 9.14m with a cold drawing machine, and then straightened by the sucker rod straightening machine; The cylinder upsetting machine performs upsetting on one end, and then threading on both ends.

[0035] (3) Preparation of the surface coating of the oil sucker polished rod: firstly, the surface of the oil sucker polished rod base is subjected to sanding treatment to remove rust, roughen and activate the surface of the blank; A layer of nickel-based alloy coating with a thickness of 0.30mm to 0.50mm is spray-welded between the middle surface and both ends of the oil-sucking polished rod base 100mm to 800mm; after spraying, medium frequency induction heating is used for remelting to form a metallurgical bond between the coating and the base.

[0036] (4) Remelting heat treatment is performed on the nickel-based alloy c...

Embodiment 1

[0038] An oil sucker polished rod is composed of a sucker polished rod base body and a nickel-based alloy coating spray-welded on the surface of the oil sucker polished rod base body. The chemical composition and weight percentage of the base body are: carbon 0.12%, silicon 1.1%, Manganese 0.8%, phosphorus 0.022%, sulfur 0.023%, chromium 1.3%, nickel 0.25, molybdenum 0.4, and the balance is iron.

Embodiment 2

[0040] An oil-sucking polished rod, the chemical composition and weight percentage of its matrix are: carbon 0.20%, silicon 1.5%, manganese 1.0%, phosphorus 0.020%, sulfur 0.022%, chromium 0.8%, nickel 0.33, molybdenum 0.6, the balance for iron.

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Abstract

The invention relates to an oil pumping polish rod, consisting of an oil pumping polish rod base body and a nickel-based alloy coating layer on the surface of the oil pumping polish rod base body, wherein the oil pumping polish rod base body comprises the following chemical components in percent by weight: 0.12-0.20 percent of carbon, 0.50-1.60 percent of silicon, 0.50-1.10 percent of manganese, less than or equal to 0.025 percent of phosphorus, less than or equal to 0.025 percent of sulphur, more than or equal to 1.50 percent of chromium, nickel and molybdenum and the balance of ferrum. The oil pumping polish rod has the advantages of better comprehensive mechanical property, high intensity, high stretchability and high fatigue resistance. Through spraying and welding the nickel-based alloy coating layer on the surface of steel materials, the corrosion resistance is also improved so that the made alloy polish rod can excellently meet the increasingly-demanding high load and corrosive service environment in the oil field.

Description

technical field [0001] The invention relates to the field of petroleum equipment, in particular to an oil sucker polished rod. Background technique [0002] Pumping wells have always been the main method of oil production in domestic and foreign oil fields. With the increasing number of deep oil wells, heavy oil wells and high water cut wells, the role and performance of smooth pumping rods are becoming more and more important. However, the actual working environment of the polished rod is very harsh, not only to bear the increasing load, but also to be corroded in the environment of oil well production fluid and atmosphere. The study found that 90% of the polished rods broke under the polished rod clamps, and 100% of the fractures under the polished rod clamps were fatigue fractures. Therefore, the current sucker rod must be continuously improved in both fatigue resistance and corrosion resistance to meet the constantly harsh service environment. [0003] At present, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00C22C38/44C22C38/40C22C38/34C22C38/22C22C38/18C22C38/12C22C38/08C22C19/05C23C4/12C23C4/06C23C24/10C23C4/08C23C4/129
Inventor 吴振宁高海军于海吴秀田杨云霞
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