Preparation method of rolled steel for drill collar in deep well drilling

A drilling and drill collar technology, which is applied in the field of petroleum equipment preparation, can solve the problems of drill collar fracture and failure to meet drilling requirements, and achieve the effects of increased wear resistance and strength, bright and clean surface, and improved performance

Inactive Publication Date: 2018-02-27
SICHUAN QIXING ELECTRONICS
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  • Abstract
  • Description
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Problems solved by technology

[0003] During use, because the drill collar plays the role of preventing deflection, it will continue to rub against the well wall, and because the drill collar is installed close to the drill bit, it is prone to stress corrosion and alternating bending fatigue stress, which is easy to cause the drill collar Fractures and other damages cannot meet the needs of drilling, especially deep well drilling

Method used

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Embodiment Construction

[0016] The present invention will be described in detail below.

[0017] A method for preparing steel for drill collars in deep well drilling, comprising:

[0018] (1), putting pig iron into the furnace and melting it as an iron matrix, after desulfurization, deoxidation, and dephosphorization, the sulfur content in the pig iron is lower than 0.02% and the phosphorus content is lower than 0.03% after the treatment;

[0019] (2) In a vacuum environment, add Mn, Ti, Nb into the iron matrix and mix evenly, heat to a molten state, keep it for 1-2 hours, then add C, Cr, Mo, W, Sn, N, mix Uniform, after holding at 750-800°C for 10-15 minutes, increase the temperature to 1100-1200°C at a rate of 5-10°C / min, after holding for 2-3 hours, then cast at a constant temperature at 800-850°C;

[0020] (3) Continue to maintain the vacuum environment. After the casting is completed, reduce the temperature to 400-450°C at a cooling rate of 5-10°C / min, and then cool to 250-280°C;

[0021] (4) ...

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Abstract

The invention discloses a method for preparing steel for drill collars in deep well drilling, which includes desulfurization and dephosphorization of iron matrix; heating Mn, Ti and Nb materials in a vacuum environment; pouring; multiple times of quenching and multiple times of tempering. The newly obtained drill collar prepared by the method has significantly enhanced wear resistance and strength, can cope with stress corrosion and stress bending fatigue damage caused by harsh environment in deep well drilling, and ensure normal drilling of deep wells. Vacuum treatment can realize no oxidation, no decarburization, no carburization, can remove phosphorus chips on the surface of the workpiece, and has the effect of degreasing and degassing, so as to achieve the effect of surface brightening and purification, and further improve the performance of drill collars.

Description

technical field [0001] The invention relates to the field of preparation of petroleum equipment, in particular to a method for preparing steel for drill collars in deep well drilling. Background technique [0002] Drill collars are an important part of the drill string during oil drilling. Drill collars are located in the lower part of the drill string and are connected to the drill bit. In addition to transmitting torque, the weight on bit is also stroked to allow the bit to penetrate. At present, the raw material of the drill collar is 42CrMo steel smelted by electric arc, and it is delivered in a hot-rolled state. The manufacturer straightens the drill collar in the hot-rolled state, roughly processes it, and then quenches and tempers it. Straightening, stress-relieving and tempering is done at 520°C for 6 hours. Air-cooled, check the mechanical properties, and deliver it for use after finishing. [0003] During use, because the drill collar plays the role of preventin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/15C21D1/18C22C33/04
CPCB22D27/15C21D1/18C22C33/04
Inventor 江明泓
Owner SICHUAN QIXING ELECTRONICS
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