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Bidirectional injection moulding method of stator rubber of screw drilling tools

A technology of injection molding and screw drilling tools, which is applied in the field of two-way injection molding of the stator rubber of screw drilling tools, and achieves the effects of removing rust and oxide layer in good condition, expanding the bonding area, and being easy to clean.

Inactive Publication Date: 2010-02-03
南京金三力橡塑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of the winding degree of the rubber layer, the eccentricity of the core and the relatively low production efficiency existing in the existing method of injecting glue for the stator of the screw drilling tool, the present invention provides a method for two-way injection molding of the stator rubber of the screw drilling tool, which can eliminate the stator The winding degree and eccentricity of the inner hole glue layer hole increase the service life of the stator; improve the qualified rate; overcome the shortcomings of slow glue injection and long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for two-way injection molding of screw drilling tool stator rubber

[0030] (1) Sand blast (sand blast) the inner hole wall of the steel pipe used for stator glue injection.

[0031] (2) Clean the inner hole of the steel pipe that has been sandblasted, and dry it after cleaning.

[0032] (3) Apply the adhesive twice in the inner hole of the cleaned and dried steel pipe.

[0033] (4) After the adhesive coated on the inner hole of the steel pipe is dry, assemble the mold core that has been preheated to 100°C±10°C into the inner hole of the steel pipe, and position the two ends of the steel pipe with the shaft head of the mold core. keyhole.

[0034] (5) Put the assembled stator and the matching injection mold into the oven, and heat it to 120°C±10°C as a whole.

[0035] (6) After heating to the required temperature, take out the stator and the injection mold from the oven, insert the stator into the injection head mold, and inject glue from both ends of the st...

Embodiment 2

[0049] The basic steps are the same as in Example 1, except that the raw materials for blasting treatment in step (1) are replaced with iron sand or brown corundum. The bonding area between rubber and metal is enlarged, and the bonding strength is improved.

Embodiment 3

[0051] The basic steps are the same as in Example 2. In step (3), the inner hole of the cleaned and dried steel pipe is coated with an adhesive three times, wherein the surface layer is applied once, the inner layer is applied twice, and the bottom layer adopts an adhesive with strong adhesion to the metal; The surface layer adopts an adhesive with good bonding performance with the adhesive layer. Reduce the phenomenon of uneven thickness of brushing, eliminate the blind spots of missed coating.

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Abstract

The invention discloses a bidirectional injection moulding method of stator rubber of screw drilling tools, which belongs to the technical field of stator rubber injection of screw drilling tools andcomprises the following steps: grit-blasting; washing and drying; brushing adhesive; assembling a mould core into an internal hole of a steel pipe; putting a stator and an injection moulding mould inan oven and heating; carrying out vacuum negative-pressure rubber injection from two ends to the center of the stator; sealing the stator and putting the stator in a vulcanizing boiler to carry out vulcanization; taking out the stator and cooling; disassembling screw nuts, end caps and shims used for positioning on two ends of the stator, and pushing the mould core out of the rubber layer of the internal hole of the stator so as to be disengaged. The rubber injection method from two ends to the center of the stator prevents rubber from pressing the mould core to cause linear deformation of themould core, fundamentally eliminates the wrapping extent and the core shift of the rubber layer hole in the internal hole of the stator, greatly prolongs the service life of the stator, reduces air bubbles in the rubber layer of the stator and defects on the surface, such as pits, flow marks and the like and increases the qualification rate. The method overcomes the defects of low speed and longtime of rubber injection.

Description

technical field [0001] The invention relates to a method for injecting glue into the stator of a screw drilling tool, more specifically a method for bidirectional injection molding of the stator rubber of the screw drilling tool. Background technique [0002] Screw drilling tool is a power tool used in drilling directional wells in oil fields. With the extensive use of directional wells, the use of screw drilling tools is becoming more and more common. It can be widely used in directional wells, horizontal wells, and sidetracking cluster wells, especially for difficult ultra-deep wells and high-temperature wells. Looking for oil in deeper layers has a wider range of applications and better prospects. The screw drilling tool is composed of a screw (rotor), stator bushing, cardan shaft, main shaft, drill joint, bypass valve on the upper end of the drilling tool, etc. The most important working elements of the screw drilling tool are the screw and the bushing. The inner hole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C39/02B29C39/42B29C33/60
Inventor 房小陶汤守信
Owner 南京金三力橡塑有限公司
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