Manufacturing method of aluminum alloy petroleum drill rod

Abstract

The invention relates to the field of metal equipment manufacturing methods, in particular to a manufacturing method of an aluminum alloy petroleum drill rod. The aluminum alloy petroleum drill rod is a hollow round pipe. The manufacturing method is characterized by comprising the following steps of casting, extrusion, drawing, correction, finishing and forming of an outer edge combining portion and an inner edge combining portion, manufacturing of a match-working drill locking hole and a locking ball, manufacturing of aluminum-alloy contracted pipes and rope arrangement inside the aluminum-alloy pipes. The manufactured drill rod is high in strength, the outer edge combining portion and the inner edge combining portion of the connecting portion are roll-formed by adopting a cold rolling process, a concentrated stress is small through annealing treatment, the lengths of the outer edge combining portion and the inner edge combining portion are 12%-15% of the total length of a tubular material semi-finished product, the strength of the bonding portion is ensured, the locking hole at the combined position of the outer edge combining portion and the inner edge combining portion which are adjacent is the match-working drill hole, the installing precision is high, the aluminum-alloy contracted pipes are connected by adopting ropes, and convenience is brought to installation and connection.

Description

technical field [0001] The invention relates to the field of metal equipment production methods, in particular to a production method of an aluminum alloy oil drill pipe. Background technique [0002] Aluminum alloy drill pipe is divided into two types: steel joint aluminum alloy drill pipe and all aluminum alloy drill pipe. The steel joint aluminum alloy drill pipe is connected by the steel joint and the aluminum alloy drill pipe body by thread connection, thus forming a drill pipe. single rod. The steel joint and the aluminum alloy drill pipe body adopt a hot assembly process, that is, the steel joint is heated to a certain temperature during assembly to allow it to expand to a certain extent. Prevent thread shackles. All-aluminum alloy drill pipes are divided into integral aluminum alloy drill pipes and friction-welded aluminum alloy drill pipes. The all-aluminum alloy drill pipes used at home and abroad are integral aluminum alloy drill pipes. Literature, no products ...

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Problems solved by technology

[0003] Due to the non-corrosion resistance of the steel joint material, the aluminum alloy drill pipe with steel joint cannot meet the exploration and development conditions of sour oil and gas reservoirs. prone to galvanic corrosion at threaded connections

[0004] Although the integral all-aluminum alloy drill pipe has good corrosion resistance, the structural size of the joint (outer diameter and wall thickness) is much larger than the pipe body, and the overall extrusion molding process is difficult. Due to the complexity of the overall molding process of the drill pipe joint, the cost High, which reduces the cost performance of all-aluminum alloy drill pipes

Therefore, at present, aluminum alloy drill pipes with steel joints are usually used, but aluminum alloy drill pipes with steel joints have the problems of poor corrosion resistance, prone to electrochemical corrosion, and high assembly accuracy caused by hot fitting.

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