High-strength and high-performance coiled tubing and manufacturing method thereof

Abstract

The invention discloses high-strength and high-performance coiled tubing and a manufacturing method thereof. The manufacturing method comprises the following steps that firstly, molten iron serves as main raw materials, passes through a top and bottom combined blown rotary furnace, is subjected to argon-oxygen decarbonization, ladle refining and external refining and is poured into a continuous cast billet, and the cast billet is cast into a plate blank and finally manufactured into a coiled plate with the length larger than 500 m; secondly, the coiled plate is longitudinally sheared and subjected to butt joint; thirdly, the straight-seam ultra-high coiled tubing is manufactured; and fourthly, heat treatment needs to be conducted on high-frequency welding lines and a whole tubing body. According to the manufacturing method of the ultrahigh-strength coiled tubing, the yield strength of the manufactured coiled tubing ranges from 689 MPa to 965 MPa, the tensile strength ranges from 758 MPa to 1,034 MPa, and the hardness is smaller than or equal to 28 HRC. The high-strength and high-performance coiled tubing has the beneficial effects of being high in strength, torque and pressure resistance and long in service life, and is suitable for being applied to deep wells and ultra-deep wells and suitable for high-pressure operation at the same time. In the horizontal fracturing operation process, the number of layers fractured at a time can be dozens, the operation efficiency is high, and the output of oil and gas wells can be effectively increased.

Description

Technical field: [0001] The invention belongs to the technical field of petroleum and natural gas pipes, and relates to a method for manufacturing an ultra-high-strength coiled tube with high torque, high compression resistance, and long service life, especially a high-strength, high-performance coiled tube and a manufacturing method thereof. Background technique: [0002] Coiled tubing (CT, Coiledtubing) is a new type of oil and gas pipe with high strength, high plasticity and certain corrosion resistance, with a single length of several kilometers. Coiled tubing will play an increasingly important role in oil and gas field exploration, development, operation, and production stimulation because coiled tubing technology has a series of technical and operational advantages such as high efficiency, low cost, wide operating range, and small footprint. ,with broadly application foreground. [0003] At present, with the increasing difficulty of oil and gas exploration and develo...

AI Technical Summary

Problems solved by technology

Conventional coiled tubing has low strength and cannot adapt to the above-mentioned deep wells, ultra-deep wells and high-pressure wells