Abstract
Special aluminum alloys appear to be promising materials for manufacture of high-strength light-alloy drill pipes (HSLADP) that can be used in areas with a severe climate and challenging geology. The effect of using light-alloy drill pipes (LADP) depends directly on the properties of the aluminum alloys from which such pipes are made. As the wells become deeper and horizontal wellbores get longer, use of LADPs becomes more relevant. Since light-alloy pipes are 2.8 times softer than steel pipes, LADPs offer the same performance as steel drill pipes of the lowest strength grade even in the case of rotary drilling. The materials from which such pipes are made have a number of unique advantages: extra light weight in the drill mud, allowing the coefficient of sliding friction between the pipe surface and the borehole wall to be reduced; high corrosion resistance in aggressive media with A high concentration of hydrogen sulfide and carbon dioxide; and high magnetic inductive capacity that allows LADPs to be used as a housing for MWD (measurement while drilling) and LWD (logging while drilling) telemetry systems during well-drilling operations. This study suggests methods for industrial production of submicrocrystalline (SMC) structure in aluminum alloys with the help of severe plastic deformation. Through the example of model aluminum-lithium alloys 1420 (Al-Mg-Li-Zr) and 1460 (Al-Сu-Li-Zr), the researchers demonstrate that SMC structure helps significantly increase resistance to wear and reduce the rate of corrosion depending on the pH value. The research team also states that severe plastic deformation methods may be used to develop highly promising technologies for manufacture of high-strength LADPs with advanced strain-stress properties for use during operations in the Arctic.
Highlights
Real-life experience shows that such wells cannot be drilled without using high-strength light-alloy drill pipes (HSLADP) manufactured from special aluminum alloys (Fain 1990, Basovich et al 2003, Basovich et al 2015, Shammazov et al 2000)
It has been proven that SMC and NC structures can be used to manufacture high-strength materials (Furukawa et al 1996, Furukawa et al 1997). Even such structurally insensitive parameters as Curie and Debye temperatures, modulus of elasticity, saturation magnetic moment, etc. are prone to change in these materials. These findings indicate that scientists can develop new advanced technologies for production of aluminum alloys used in the manufacture of HSLADPs with improved mechanical
The study demonstrated that the severe plastic deformation technique (ECAP method) can be used to make the structure of alloys significantly more compact, and to obtain grains with different states of grain boundaries
Summary
Investigation of tribotechnical and corrosion behaviour of material for light-alloy drill pipes.
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