Method for induction heating on threaded surface of oil casing collar

Abstract

The invention discloses a method for induction heating on a threaded surface of an oil casing collar. The method comprises the following steps: turning threads on a collar, conveying the collar to a platform and clamping the collar, closing end ports, putting the collar into a sealed oven, putting the oven into an inductor, heating internal threads and external threads in the ends of the collar by the inductor first and then sending the collar into a cooling water system with a filtering function for quenching, tempering once, exiting from the cooling water system, greasing the threads of the collar with a co-cementation layer, marking the collar, testing pressure, performing anticorrosive treatment and packaging. The treated collar is corrosion-resistant, wear-resistant and free of brittleness and has an anti-sticking function; due to the adoption of the method, an aim of increasing the using times of the oil casing is achieved and the cost of oilfield exploitation is saved; therefore, the induction heating method has a very high popularization value.

Description

Technical field:

[0001] The invention belongs to the processing field of metal steel pipes for petroleum development, and in particular relates to a method for inductively heating the surface of the threaded buckle of the collar of petroleum casing. Background technique:

[0002] At present, the main process steps commonly used in the processing of traditional couplings are: auxiliary measures such as threading (thread processing), inspection, marking, pressure test and protection for the couplings, and no special treatment for the threads of the couplings. Although the number of screw connections of imported couplings is better than that of domestic couplings, the actual working conditions of the couplings are harsh and the force is large. , The torque is large, and the screw thread will be worn and unloaded several times, causing failure phenomena such as sticking and buckling, which will affect crude oil production.

[0003] The sticking phenomenon of the coupling is the...

Examples

Embodiment Construction

[0015] Specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0016] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0017] A method for inductively heating the surface of an oil casing collar screw, the steps of which are:

[0018] Step 1: Thread the coupling with a length of 80-150mm and a diameter of 50-150mm, and the length of the external thread at the end is 50-200mm;

[0019] Step 2: Transport the couplings to the platform for clamping, close the port, and then put the couplings into the sealed oven one by one, and put the oven into the sensor one by one. The sensor first heats the i...

Technical field:

[0001] The invention belongs to the processing field of metal steel pipes for petroleum development, and in particular relates to a method for inductively heating the surface of the threaded buckle of the collar of petroleum casing. Background technique:

[0002] At present, the main process steps commonly used in the processing of traditional couplings are: auxiliary measures such as threading (thread processing), inspection, marking, pressure test and protection for the couplings, and no special treatment for the threads of the couplings. Although the number of screw connections of imported couplings is better than that of domestic couplings, the actual working conditions of the couplings are harsh and the force is large. , The torque is large, and the screw thread will be worn and unloaded several times, causing failure phenomena such as sticking and buckling, which will affect crude oil production.

[0003] The sticking phenomenon of the coupling is the...

Examples

Embodiment Construction

[0015] Specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0016] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

[0017] A method for inductively heating the surface of an oil casing collar screw, the steps of which are:

[0018] Step 1: Thread the coupling with a length of 80-150mm and a diameter of 50-150mm, and the length of the external thread at the end is 50-200mm;

[0019] Step 2: Transport the couplings to the platform for clamping, close the port, and then put the couplings into the sealed oven one by one, and put the oven into the sensor one by one. The sensor first heats the i...