Abstract
The new aluminium alloy for drill pipes is one of the 6xxx-series alloys. The alloy has high strength properties at room and elevated temperatures, as well as high corrosion resistance and workability. Semi-finished extruded products from the new alloy have the following properties: UTS = 420 MPa, YTS = 380 MPa, elongation = 10% and YTS150 = 345 MPa, corrosion rate in solution (pH 11) = 0.09 g/m2 h. Based on the obtained properties, the new alloy can be used as a replacement for D16 alloy.
Highlights
Steel pipes have always met all the requirements when used in wells drilled in shallow deposits
The cast ingots have low ductility and corrosion resistance, as well as anisotropy of properties, which will negatively affect the process of extrusion
Due to its high properties, the developed alloy can be used in replace of D16 alloy
Summary
Steel pipes have always met all the requirements when used in wells drilled in shallow deposits. The use of aluminium pipes has not been very common. Nowadays such deposits are almost exhausted and new ones are being developed intensively. The increased depth of such deposits (over 3500 meters) has affected the complexity of drilling conditions – the drilling depth has significantly increased, and the practices of directional and subsea drilling have been launched [1, 2]. Modern drilling technologies are designed to increase the capacity of equipment and for the use of steel alternatives. Since the possibility of increasing the drive power is quite limited and economically impractical, the application of alternative steel materials – namely, aluminium alloys – becomes the most cost-effective and relevant target [3]
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