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Full-automatic on-line method for gag press straightening jackrod

A fully automatic, straightening technology, applied in the mechanical field, can solve problems such as poor straightness at the end of drill pipes, and achieve the effects of straightness out-of-tolerance, high precision, and high production cycle

Inactive Publication Date: 2008-06-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides an on-line automatic pressure straightening method for drill pipes, which realizes online automatic pressure straightening at the end of drill pipes based on the principle of pressure straightening, and solves the problem of The problem of excessive straightness

Method used

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  • Full-automatic on-line method for gag press straightening jackrod

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Embodiment

[0033] In this embodiment, the specifications of the drill pipe are selected: outer diameter 127mm, steel grade G105, wall thickness 9.19mm, ambient temperature 20 degrees, drill pipe temperature 20 degrees, straightening method is straightening at both ends. Test indicators: the runout at the 30mm end of the pipe is less than 2mm, and the runout at the 366mm end of the pipe is less than 1.2mm. The initial straightening parameters are all 6mm, after one hour of parameter self-learning. Actual production of a class, implementation effect comparison:

[0034] In this embodiment: all the drill pipes meet the inspection requirements, and the production cycle is 2 minutes per piece. After pressure straightening, the surface of the drill pipe is intact, which can effectively straighten the curved part.

[0035] Traditional method: a small number of drill pipes do not meet the inspection requirements, and the production cycle: 3 minutes per piece. Some drill pipes are damaged due to...

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Abstract

The invention discloses a method for straightening the pressure of drill rods, which is full-automatic and on line. The invention comprises firstly, delivering a drill rod through a roll frame and positioning precisely the drill rod to a testing position through a photoelectric switch, using a non-contact method to test straightness as the drill rod rotates, delivering the drill rod to blank if the drill rod is qualified, firstly, selecting a straightening strategy if the drill rod is un-qualified, certifying the straightening strategy, and positioning precisely the drill rod into a step clamp, secondly, subtracting a straightening parameter from a dynamic knowledge base of straightening parameters of a host computer and knowing a size of a stroke which should be fed to an oil cylinder, thirdly, driving hydraulic pressure to feed the oil cylinder, using a control technique of a straightening stroke to realize precise control for the stroke of the oil cylinder, and finishing a straightening stroke, fourthly, rechecking after a straightening is finished, and using a self-studying system of the straightening parameters to adjust and optimize the straightening parameter. The invention is enabled to realize the straightening of the pressure for ends of the drill rod, which is full-automatic and on line, and the problem that ends of the drill rod have ultra-poor straightness can be solved.

Description

technical field [0001] The invention relates to a method in the field of mechanical technology, in particular to an online fully automatic pressure straightening method for drill pipes. Background technique [0002] Oil and gas well drill pipe is an important tool for oil and gas drilling and production. Seamless steel pipes for the petroleum industry - oil well pipes include drill string components (drill pipes, drill collars, etc.), casings, and oil pipes. Drilling pipes and drill collars must be used for drilling operations in oil exploration and development, casings must be used for cementing, and tubing must be used for oil production. According to statistics, about 62 kilograms of oil well pipes are required for drilling 1 meter of oil well, including 48 kilograms of casing, 10 kilograms of tubing, 3 kilograms of drill pipe, and 0.5 kilogram of drill collar. In the process of oil and gas drilling, the drill pipe is subject to huge axial pressure and torque, and the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/00G05B13/02
Inventor 许黎明胡德金魏臣隽时轮王海丽
Owner SHANGHAI JIAO TONG UNIV
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