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High temperature phosphorization process of stone oil drill collar screwed nipple

A threaded joint and oil drilling technology, which is applied in the coating process of metal materials, etc., can solve the problems of slow crystallization of phosphating grains, insufficient ion adhesion, and large pores

Inactive Publication Date: 2008-12-10
JIANGSU SHUGUANG HUAYANG DRILLING TOOL
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thin surface film formed by phosphating at room temperature and large pores, the crystallization of phosphating grains is slow at room temperature, and the ion adhesion is not strong enough.
Therefore, the threaded joint of the drill collar is prone to sticking when it meshes with the drill collar

Method used

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Experimental program
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Embodiment Construction

[0019] The present invention will be further illustrated below by specific examples.

[0020] The high-temperature phosphating process for threaded joints of petroleum drill collars includes three processes: pre-phosphating surface treatment, high-temperature phosphating treatment and post-phosphating surface treatment. This embodiment firstly implements the surface treatment process before phosphating: place the drill collar to be treated obliquely on the station frame, the threaded joint of the drill collar is at the bottom end, apply degreaser on the thread and shoulder, and after 1~ 2-minute degreasing treatment to remove the grease adhered during machining. Then rinse the degreaser attached to the threaded joint of the drill collar with clean water. The second step is to implement high-temperature phosphating treatment process: put the phosphating solution with a total content of 18% in an open container and heat it to 90±2°C, move the open container containing the phosp...

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Abstract

The invention discloses a high-temperature phosphating process for a nipple threading connector of an oil drill collar, which comprises three steps of surface treatment before phosphating, high-temperature phosphating and surface treatment after phosphating. The surface treatment before phosphating is oil removal treatment. The treatment of high-temperature phosphating comprises the steps that: firstly, the phosphating solution in an open container is heated up to between 85 and 95 DEG C; then the nipple threading connector of the drill collar and the circular head are wholly immersed in the phosphating solution for 12 to 15 minutes; and then the connecter is taken out from the phosphating solution, a temperature of the phosphated surface is reduced and the surface is dried naturally. At last, the surface treatment after phosphating comprises the steps that: the dried phosphated surface is painted with an antirust oil layer and a thread-protecting oil layer. The invention has simple and convenient procedures, easy operation and good quality of the phosphated surface, thereby effectively improving antirust capability and wear resistance of the drill collar and reducing the phenomenon of gear adhesion during meshing. The process is particularly suitable for phosphating the end part of long rod components.

Description

technical field [0001] The invention relates to a metal surface treatment process, in particular to a high-temperature phosphating process. Background technique [0002] Oil drilling requires several joints of connected drill pipes to reach the set drilling depth. The drill pipe and the drill bit are connected through drill collars, and the threaded joints of the drill collars not only undertake the role of connection, but also bear the role of transmitting torque. Under this multiple load condition, the threaded joints of the drill collars are required to have sufficient structural strength, Also have good meshing accuracy. Although the prior art has carried out the necessary room temperature phosphating process to the surface of the threaded joint of the drill collar, the surface quality of the threaded joint of the drill collar has been effectively improved. However, due to the thin surface film and large pores formed by phosphating at room temperature, the crystallizat...

Claims

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Application Information

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IPC IPC(8): C23C22/07
Inventor 蒋家华黄海春张喜钱善龙蒋存民
Owner JIANGSU SHUGUANG HUAYANG DRILLING TOOL
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