Phi 406-phi 130 large-caliper petroleum casing pipe variable-diameter joint and manufacturing method thereof

Abstract

The invention provides a phi 406-phi 130 large-caliper petroleum casing pipe variable-diameter joint and a manufacturing method thereof, and the method comprises the following steps: performing material inspection; hot-expanding; hot-shrinking; performing internal boring and external turning; machining a bevel; machining a thread; welding a female buckle joint of a drilling rod; japanning and stenciling; and performing finished product finishing and packaging on the large-caliper petroleum casing pipe variable-diameter joint. The method has the following effects: by using the method for producing the large-caliper petroleum casing pipe variable-diameter joint, new production records are created against a pipe nipple with large variable-diameter amount; the mechanical properties, the technological properties, the geometric size and the appearance quality of the variable-diameter joint product can be more in line with the requirements of a user, and all the technical parameters achieve the standard; as the variable-diameter can be formed once, the control key points are relatively fewer and the yield is high; by adopting the manufacturing method, the range of applications of companyproducts can be expanded, the matching use of the cementing technology of the user can be met, and the requirements of the user on the variable-diameter amount and the length of the pipe nipple can be met; and the method has less process steps in comparison with the butt-joint variable-diameter technology of the pipe nipple, therefore the cost is greatly reduced.

Description

technical field [0001] The invention is an oil well accessory used in conjunction with the cementing process, in particular a Φ406-Φ130 large-diameter oil casing reducing joint and a manufacturing method thereof. Background technique [0002] To produce variable diameter joints from Φ406 to Φ130 large-diameter oil casing with a single thermal expansion or thermal shrinkage process in the past, 4 kinds of raw materials are required to produce 4 kinds of variable diameter pup joints, and API standard threads are required between them. , Coupling for connection. The main disadvantages of the previous process methods are: [0003] 1. There are many complex processes in the process; [0004] 2. There are many control points, and the API standard thread tolerance requirements for each butt joint are strict, and the possibility of defects in the threaded connection is greater, resulting in a very low yield; [0005] 3. The shortest length after connection is also more than 3m, w...

AI Technical Summary

Problems solved by technology

[0003] 1. There are many complicated processes in the process;

[0004] 2. There are many control points, and the API standard thread tolerance requirements for each butt joint are strict, and the possibility of defects in the threaded connection is greater, resulting in a very low yield;

[0005] 3. The shortest length after connection is also more than 3m, which cannot meet various special requirements of users on the length of pup joints, etc.

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