Coiled tubing flash butt welding method capable of being used for on-site production

Abstract

The invention discloses a coiled tubing flash butt welding method capable of being used for on-site production. The coiled tubing flash butt welding method capable of being used for on-site productioncomprises the following steps that 1 ) equipment is started in a control cabinet, coiled tubing is placed in electrode clamps and is stably installed; 2) an electrode clamp button is pressed down inthe control cabinet, longitudinal air cylinders are started, and the electrode clamps perform tight clamping; 3) an electric system is started to supply power to the electrode clamps; 4) transverse air cylinders work to enable the electrode clamps on the two sides to be fed to the middle at the same speed, when samples in the electrode clamps on the two sides are in contact with a sample in the electrode clamp in the middle, two joints generate flash processes, after flash lasts by a certain distance, the electrode clamps at the two ends move reversely, after the electrode clamps at the two ends move away by a certain distance, the electrode clamps at the two ends carry the samples to feed to the sample in the middle at a certain speed, when a proper amount of flashes are generated in thetwo joints, the flash butt welding process is completed; and 5) under the action of the air cylinders, the electrode clamps perform loosening, and the formed sample is taken down. According to the coiled tubing flash butt welding method, the problem that due to the fact that the pipe walls are grounded during coiled tubing open field flash butt welding operation, welding can not be achieved is solved, the coiled tubing flash butt welding method can be used for coiled tubing open field on-site connection, the welding speed is high, the joint performance is good, and the quality is stable and reliable.

Description

technical field [0001] The invention belongs to the technical field of metal continuous tube connection, relates to an experimental method for high-efficiency and high-quality connection of metal tubes in the on-site production process, and specifically relates to a coiled tube flash-butt welding method that can be used in on-site production. Background technique [0002] Coiled Tubing (CT for short) is a high-performance flexible tubing with high strength and high toughness that can be wound on a large-diameter (generally about 1 m or more) reel, and a single tube can be several kilometers long , the working pressure can reach 60 MPa, and it can run into or out of the oil well continuously for operation. The coiled tubing operation technology with coiled tubing as the core device is currently the most advanced oil and gas field operation method. Due to its advantages of economy, safety and high efficiency, it has been widely used in various oil field operations. [0003] S...

AI Technical Summary

Problems solved by technology

However, when the coiled tubing is connected on site by the flash butt welding method, the welding cannot be completed due to the grounding of the pipe wall, which seriously restricts the application of the flash butt welding technology in the coiled tubing oilfield operation site, and it is necessary to develop a coiled tubing that can be used in field production flash butt welding method

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