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Non-magnetic drill collar surface rolling processing method

A non-magnetic drill collar and processing method technology, applied in the direction of drill pipe, drill pipe, drilling equipment, etc., to achieve the effects of easy control of processing size, long service life and improved fatigue strength

Active Publication Date: 2010-09-08
HENAN SHENLONG GASOLINEEUM DRILLING TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the surface strength problem of non-magnetic drill collars, the present invention provides a surface rolling processing method, in which inner and outer circular rolling tools are installed on a common horizontal lathe, and a certain pressure is applied to the surface of the workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: processing NC38-50 non-magnetic drill collar comprises the following steps:

[0018] (1) Rough turning outer circle

[0019] Position the non-magnetic drill collar workpiece based on the center holes at both ends. After checking the overall length, surface quality and allowance, rough the outer circle to Ф135 0 +3 ;Turn around, after clamping and alignment, the outer circle of the rest of the car;

[0020] (2) Drill the inner hole

[0021] Clamp the outer circle of the workpiece on a special deep hole drilling machine, after measuring the runout of the outer circle ≤ 2.0mm, clamp the workpiece, and drill the pilot hole Ф57 0 +1 , length ≤ 100mm, pull out Ф57 0 +1 The hole goes through, the exit deviation is ≤3.0mm, the inner hole rolling machining allowance is guaranteed to be 0.15mm, and the surface roughness is above Ra6.3;

[0022] (3) Inner hole rolling

[0023] Install the tungsten carbide roller of the inner hole rolling tool in the taper sle...

Embodiment 2

[0028] Embodiment 2: processing NC46-65 non-magnetic drill collar, comprises the following steps:

[0029] (1) Rough turning outer circle

[0030] Position the non-magnetic drill collar workpiece based on the center holes at both ends. After checking the overall length, surface quality and allowance, rough turn the outer circle to Ф170+30;

[0031] (2) Drill the inner hole

[0032] Clamp the outer circle of the workpiece on a special deep hole drilling machine, and after measuring the runout of the outer circle ≤ 2.0mm, clamp the workpiece, drill the pilot hole Ф71.2+10, the length ≤ 100mm, and pull out the hole Ф71.2+10 until it penetrates , the outlet deviation ≤ 3.0mm, ensure that the inner hole rolling machining allowance is 0.18mm, and the surface roughness is above Ra6.3;

[0033] (3) Inner hole rolling

[0034] Install the tungsten carbide roller of the inner hole rolling tool in the taper sleeve hole of the extended drill rod, adjust the diameter of the roller, the ...

Embodiment 3

[0039] Embodiment 3: processing 7-5 / 8REG non-magnetic drill collar, comprises the following steps:

[0040] (1) Rough turning outer circle

[0041] Position the non-magnetic drill collar workpiece based on the center holes at both ends. After checking the overall length, surface quality and allowance, rough turn the outer circle to Ф245+30;

[0042] (2) Drill the inner hole

[0043] Clamp the outer circle of the workpiece on a special deep hole drilling machine, and after measuring the runout of the outer circle ≤ 2.0mm, clamp the workpiece, drill the pilot hole Ф76+10, the length ≤ 100mm, pull out the hole Ф76+10 until it penetrates, and the exit deviation ≤ 3.0mm, ensure that the inner hole rolling machining allowance is 0.2mm, and the surface roughness is above Ra6.3;

[0044] (3) Inner hole rolling

[0045] Install the carbide roller of the inner hole rolling tool in the taper sleeve hole of the extended drill rod, adjust the diameter of the roller, the roller and the w...

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Abstract

The invention discloses a non-magnetic drill collar surface rolling processing method. A non-magnetic drill collar material adopts low-carbon high-chromium manganese steel which is processed through the technological processes of forging, alignment, rough turning of excircle, drilling and the like, and then the processes of rolling the inner hole surface, finely turning the excircle and rolling the surface of the excircle. The rolling processing on the surfaces of the inner hole and the excircle is performed by using a hard metal alloy roller and a roller wheel respectively; and during rolling, a cutting tool and a workpiece have certain included angle and rolling linear velocity, and the feeding speed and the rolling pressure are controlled. Because the surface rolling processing method is chipless machining, surface structures are strengthened, and the service performance, the fatigue strength resistance, the wear resistance and the corrosion resistance of the workpiece are improvedobviously. After the rolling, the hardness is improved by 40 to 80 percent, the surface hardness is more than or equal to HB400, the wear resistance is improved by 30 percent, and the surface roughness is improved to be between Ra1.6 and Ra0.8 from Ra6.3. The non-magnetic drill collar surface rolling processing method effectively solves the technical difficulties that a drilling tool has low surface hardness and short fatigue life, thus the life cycle of the drilling tool after the processing is greatly prolonged.

Description

technical field [0001] The invention relates to a non-magnetic drill collar surface rolling processing method, which is applied to the surface processing of non-magnetic drilling tools for oil, natural gas and coal bed gas logging. Background technique [0002] At present, in the drilling process of oil, natural gas, and coalbed methane, non-magnetic drill collars are often used. It is a drilling tool that is not easily magnetized and has extremely low magnetic permeability. The measurement environment affected by the drill string magnetic field. Through high-sensitivity sensors, wellbore magnetic azimuth, downhole drilling pressure, torque, and formation resistivity, neutron and other logging information are transmitted to the ground, so that drillers and geological experts can effectively "see" real-time downhole events conditions, thereby improving the success rate of drilling and ensuring the quality of drilling. Non-magnetic drill collars are generally made of low-car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P9/02E21B17/16
Inventor 张建刚谢世龙张清明牛战波
Owner HENAN SHENLONG GASOLINEEUM DRILLING TOOLS
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