As the blood of industry, oil occupies an important position in the energy strategy. The key to increasing oil production in my country is to improve oil drilling technology. Expandable tube technology is an important new oil and gas engineering new technology produced and developed at the end of the last century and the beginning of this century. It is a mechanical or hydraulic method used underground to move the expansion cone from top to bottom or from bottom to top to make the casing The steel is permanently plastically deformed to achieve the purpose of the expanded casing close to the well wall. The use of expandable tube technology can greatly improve the production efficiency of drilling engineering in oil and gas development, save manpower, materials, time and cost, and promote the development of other related technologies. The US oil engineering authority Cook describes the expandable tube technology as “oil drilling “The moon landing project” is one of the key technologies in the oil and gas industry in the 21st century, and the expansion tube material is one of the most critical issues in the expansion tube technology.
Dual phase steel structure is mainly composed of ferrite and martensite, also known as martensitic dual phase steel. It has the characteristics of non-yield extension, low yield strength, high tensile strength and good plastic matching, and is expected to become the preferred material for the manufacture of expansion pipes in the petroleum industry. The excellent characteristics of dual-phase steel mainly depend on the morphology and quantity of martensite, and the quenching temperature has a decisive influence on the quantity of martensite in the dual-phase steel.
Designed the appropriate chemical composition of the dual-phase steel for expansion tubes, and studied the effect of quenching temperature on the microstructure and mechanical properties of the dual-phase steel. The results show that as the quenching temperature increases, the volume fraction of martensite gradually increases, resulting in an increase in yield strength and tensile strength. When the quenching temperature is 820℃, the dual-phase steel for expansion tubes can obtain the best comprehensive performance.
Post time: Jul-03-2020