** Shares in oil and oilfied services companies at thebottom of the Stoxx 600 as oil heads towards $27
** Stoxx 600 Oil and Gas Index down 3.3 pct,oilfield services cos battered
** Seadrill bottom of the Stoxx, down 12 pct;Technip, Amec Foster, Subsea,Saipem, Petrofac down 4.2-5 pct
** Energy producers also falling: Tullow, Shell, Statoil down 3.8-4.4 pct (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)