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Aluminum Alloy Drill Pipe – strong for deeper drilling :
Drill Pipe Frequently Asked Questions
Drill Pipe Frequently Asked Questions
Below is a listing of commonly asked questions relative to Aluminum Alloy Drill Pipe. If the answer to your question is not found below, please Ask Alcoa experts.
1. What aluminum alloys are used for aluminum drill pipe?
While 2014-T6 is typically used, custom alloys are available from Alcoa to meet specific needs. Q1a. What are the typical mechanical properties for aluminum drill pipe 58,000 psi yield and 64,000 psi ultimate strength.
2. What are the temperature operating limits of aluminum drill pipe?
Extended use over 250-300° F should be avoided. However short exposures, less than ~100 hrs cumulatively, to these temperatures should not result in a permanent degradation in properties.
3. What pH levels are acceptable for aluminum drill pipe?
If possible pH should be maintained below 10 and should not exceed 10.5 for extended times.
4. What is the life of aluminum drill pipe?
Varies with operating environment and practices, but aluminum drill pipe has been known to last with up to 20 or more years with proper maintenance and operating practices.
5. How does aluminum drill pipe react in high H2S environments?
Aluminum has not shown susceptibility to sulfide SCC.
6. How does aluminum react in high CO2 environment?
In expected ranges of partial pressures, CO2 is generally not a concern for aluminum. However since corrosion resistance depends upon the starting pH, and temperature, in addition to the partial pressure of CO2, the overall resistance should be reviewed for your specific well environment.
7. Is thermite sparking an issue between aluminum drill pipe and steel?
Thermite sparking can occur when light metals are brought into suitable contact with an oxygen carrier, such as rusty steel. However there are several pre-requisites required to cause sparking, and the combination of these factors necessary for any type of ignitions are such that the risk is generally insignificant. Additional details can be obtained from your Alcoa representative.
8. Are special drilling tools and rig modifications required to use aluminum drill pipe?
Minimal
9. How is aluminum drill pipe made?
Assembled from extruded seamless tubing and standard API steel tool joints that are joined using an interference fit.
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