Benefits ? ? Increased? production? by? 48%? compared? to? predictions ? ? Determined? stratigraphic? position? while? drilling? horizontal? section ? ? Improved? geologic? models? ? ? Accurate? well? placement ? ? Improved? mud? system Well background and challenges ? ? Onshore,? California,? USA ? ? Warren? E&P,? Wilmington? Field? ? ? Wells:? WTU? 2171,? 2169,? 2168,? 2166 ? ? 6¾-in.? horizontal? section ? ? Tar? formation ? ? April? 2010 Bake

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