Shielding Wire: Reduce Field at Point 30mm Away

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maxwel
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Hi,
how can we reduce field at a point(of observation) 30mm from a 10 m long blank copper wire with return path somewhere at infinity carrying DC current by using a 1m long copper tube 1mm wall thickness and 30mm outer diameter?
 

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Which field?

If you are talking about the E field, then the question is not well formulated since the return conductor is at infinity.
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If you are talking about B-field, then you can't. Copper will absolutely no effect on a static B field.