Petroleum annular tube reducer union and production process

Abstract

The invention provides a reducer union of the oil bushing and its prepare technologies. Its technologies contain: 1. hot expanding technology: select material tube, prepare tube, design hot expanding core, heat to , heat processing, rough turn internal and external diameters, detect, take photo, process screw, screw phosphorize / copper facing, package and warehouse entry. 2. hot shrinkage technology: select material tube, prepare tube, design hot shrinkage die, heat to the galling temperature, hot shrinkage distortion in the die, heat processing, rough turn internal and external diameters, detect, take photo, process screw, screw phosphorize / copper facing, package and warehouse entry. The reducer union of the oil bushing contains: the big-end part with internal screw, the small-end part with external screw and the conical part between the big-end part and the small-end part. The favorable effects of this invention are: taking high compression and corrosion resistant bushing as materials to replace the existing process technology and the import reducer union can simplify the technology, improve the working efficiency and lumber rate and resolve the mating problem of the union and high steel bushing.

Description

technical field

[0001] The invention relates to an oil casing variable diameter joint and a manufacturing process thereof, in particular to a whole set of manufacturing process for directly manufacturing an oil casing variable diameter joint by using a coupling material steel pipe matched with the oil casing as a raw material. Background technique

[0002] In the design of oil production wells, the production casing is a permanent device. According to the distribution of oil layers and geological conditions, the depth and inclination angle of oil wells are different. For deep wells, it is necessary to install casings with smaller specifications in the lower part. The connection between the upper and lower casings of different specifications is called a reducing joint.

[0003] In the prior art, most oilfields purchase variable diameter joints from abroad. The process is to use 35CrMo solid steel parts to be hollowed out and processed to form, and the performance requirements...

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