get node id from URL variable, to display view

Hi, I would like to display a view with a node which ID is matching a variable from the page URL.
To be clearer, I have this URL:

www.example.com/user/XXX/contact?sujet=Votre annonce&noeud=417

where "noeud" is the node ID that I want to get, to display only that node.

What I tried:

1. use the arguments (contextual filters) => added some PHP code to define the "default value". Code :
$_GET['noeud'];
I don't know if that code is working, but if it is, how could I use that variable in the views filters?

2. get the node id value directly in the filters:
Content : Nid (= $_GET['noeud'];)
Not working either...

Could someone give me a hint on how to do it?