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Drill rod and treatment process of threaded surfaces at joint thereof

A thread surface and treatment process technology, which is applied in the field of thread surface treatment process of drill pipes and their joints, can solve the problems of high cost of coating process and environmental impact, achieve high wear resistance, ensure continuity, and reduce sticking the effect of the phenomenon

Inactive Publication Date: 2020-08-04
中地装(无锡)钻探工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost of the coating process and environmental impact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a drill rod, wherein the hardness HV of the threaded surface at the joint in the drill rod is 750; the depth of the hardened layer on the threaded surface at the joint in the drill rod is 0.5 mm.

[0030] The treatment process for the threaded surface of the joint in the drill pipe includes: quenching the threaded drill pipe to obtain the drill pipe;

[0031] Wherein, the quenching range of the drill pipe is from the end of the proximity zone to the chamfer of the root of the thread at a distance of 3mm; the quenching medium in the quenching treatment is a mixed solution of water and quenching liquid (Aqua-Quench 251); the mixed solution The content of the quenching liquid in the quenching solution is 12%; the temperature of the quenching medium is 15°C; the footage speed in the quenching treatment is 1150mm / min; the rotating speed of the drill pipe in the quenching treatment is 600r / min; The anode voltage is 11kV; the anode current in the quenc...

Embodiment 2

[0034] This embodiment provides a drill rod, the hardness HV of the threaded surface at the joint in the drill rod is 620; the depth of the hardened layer on the threaded surface at the joint in the drill rod is 0.7 mm.

[0035] The treatment process for the threaded surface of the joint in the drill pipe includes: quenching the threaded drill pipe to obtain the drill pipe;

[0036]Wherein, the quenching range of the drill pipe is from the end of the proximity zone to the chamfer of the root of the thread at 8mm; the quenching medium in the quenching treatment is a mixed solution of water and quenching liquid (Aqua-Quench 251); the mixed solution The content of the quenching liquid in the quenching solution is 7%; the temperature of the quenching medium is 40°C; the footage speed in the quenching treatment is 1200mm / min; the rotating speed of the drill pipe in the quenching treatment is 400r / min; The anode voltage is 10.2kV; the anode current in the quenching treatment is 12.2...

Embodiment 3

[0039] This embodiment provides a drill rod, wherein the hardness HV of the threaded surface at the joint in the drill rod is 500; the depth of the hardened layer on the threaded surface at the joint in the drill rod is 0.5 mm.

[0040] The treatment process for the threaded surface of the joint in the drill pipe includes: quenching the threaded drill pipe to obtain the drill pipe;

[0041] Wherein, the quenching range of the drill pipe is from the end of the proximity zone to the chamfer of the root of the thread at a distance of 5mm; the quenching medium in the quenching treatment is a mixed solution of water and quenching liquid (Aqua-Quench 251); the mixed solution The content of the quenching liquid in the quenching solution is 10%; the temperature of the quenching medium is 20°C; the footage speed in the quenching treatment is 1040mm / min; the rotating speed of the drill pipe in the quenching treatment is 520r / min; The anode voltage is 11.3kV; the anode current in the que...

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Abstract

The invention relates to a treatment process of a threaded surface at a joint in a drill rod. The treatment process comprises the following steps of quenching the drill rod with machined threads to obtain the drill rod with the hardness HV of 500-780. According to the treatment process of the threaded surface at the joint in the drill rod, after the drill rod is treated through the process, the abrasion resistance of the threaded surface at the joint in the drill rod is high, so that the use continuity of the drill rod is guaranteed, and the thread gluing phenomenon is effectively reduced.

Description

technical field [0001] The invention relates to the field of surface treatment, in particular to a treatment process for the threaded surface of a drill pipe and its joint. Background technique [0002] Wireline drill pipe is the main tool used in geological exploration construction. In order to ensure the connection strength of the drill pipe thread, the thread profile of this type of drill pipe is a special trapezoidal thread. For example, CN204152450U discloses a fully open safety joint, including a male joint and a female joint. The male joint includes a pipe body I and an external threaded joint. Stress relief groove I, triangular thread I, isosceles trapezoidal thread I, oblique trapezoidal thread I and approach zone I; the female joint includes pipe body II and an internal thread joint, and the internal thread joint part is provided with shoulders in sequence from the inside to the outside Mesa II, anti-stress relief groove II, triangular thread II, isosceles trapezo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/10C21D1/60C21D9/00E21B17/042
CPCC21D1/10C21D1/60C21D9/0075E21B17/042Y02P10/25
Inventor 吴乔蔡纪雄史乐乐尹波
Owner 中地装(无锡)钻探工具有限公司
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