ONGC in shale war with Schlumberger Vol 17, PW 26 (14 Aug 14) News in Brief ONGC is accusing Schlumberger of 'gross negligence' in a sharp escalation of its dispute with the oilfield...</strong></em> Buy this article forRs590 $9 For a 30-article or annual subscription rates click here RelatedSchlumberger 'fracks' for Joshi at Dholka field (11 Feb 21) Schlumberger fights ONGC for $11m shale fine (19 Oct 17) ONGC in shale war with Schlumberger (14 Aug 14) Shale gas focus as ONGC plans another 10 wells (13 Mar 14) Another 67 wells planned by ONGC in Gujarat (05 Sep 13) Conoco help for ONGC shale 'pilot' in Gujarat (27 Jun 13) Cost recovery ban on shale contracts (06 Sep 12) ONGC shale well (07 Apr 11) Shale round in India (07 Oct 10) ONGC shale gas drilling debut in India (26 Aug 10)