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(Click for frequent words.) 61 drilling 60 driller 58 fracking 58 hydraulic fracturing 57 shale 56 horizontal drilling 56 Marcellus Shale 56 wildcatters 56 Marcellus shale formation 55 Marcellus shale 55 Marcellus wells 55 drilling rigs 54 shale formations 54 offshore drillers 54 hydraulically fracture 54 hydro fracturing 54 directional drilling 53 rigs 53 Fracking 53 Transocean NYSE RIG 53 Marcellus Shale formation 53 COGCC 52 landmen 52 fracing 52 fracking fluid 52 shale gas 52 Marcellus shale drilling 52 Likwartz 52 hydro fracking 51 fracking fluids 51 Niobrara Shale 51 Marcellus Shale drillers 51 Wonstolen 51 horizontal hydrofracking 50 drilling fluids 50 Range Resources 50 hydraulic fracturing fracking 50 XTO 50 hydrofracturing 50 shale deposits 50 Coalbed methane 50 offshore drilling 50 Barnett Shale 50 gas driller 50 offshore rigs 50 BOEMRE 50 hydraulic fracking 50 fraccing 49 coalbed methane wells 49 miners 49 deepwater drilling 49 oil sands 49 deepwater drillers 49 Utica shales 49 Marcellus Shale wells 49 Horizontal drilling 49 Halliburton HAL.N 49 Encana 49 wells 49 integrateds 49 Marcellus drillers 49 EOG Resources 49 Marcellus shale wells 49 frac'ing 49 Neslin 48 ultradeep 48 drilling rig 48 oil 48 frack 48 Marcellus Shale drilling 48 Pitzarella 48 prospectors 48 Drilling 48 BOEM 48 deepwater 48 Kaskida 48 Offshore drillers 48 supermajors 48 fracturing fluids 48 ConocoPhillips COP.N 48 coalbed 48 Gas Drilling 47 wellbore 47 Brazil Petrobras 47 Marcellus 47 shale extraction 47 hydraulic fracturing fluid 47 oilfield 47 Utica Shale formation 47 deepsea drilling 47 Haynesville Shale 47 fracking chemicals 47 coalbed methane 47 deepwater wells 47 Baker Hughes BHI 47 wells drilled 47 EOG Resources Inc. 47 Bakken shale formation 47 extract bitumen 47 Weatherford NYSE WFT 47 Newfield Exploration 47 Nabors NBR 47 Newfield Exploration Co. 47 Directional drilling 47 unconventional reservoirs 47 Niobrara shale formation 47 Bakken shale 47 Chesapeake Energy 46 Anadarko Petroleum APC 46 natural gas 46 Nabors Industries NBR 46 SEECO 46 Haynesville wells 46 maker Vetco Gray 46 unconventional shale 46 Anadarko Petroleum 46 Niobrara shale 46 PaDEP 46 North Slope 46 Chesapeake NYSE CHK 46 hydrofracking 46 Chesapeake CHK 46 Outer Continental Shelf OCS 46 Exxons 46 NYSE ESV 46 Haynesville Shale formation 46 Anadarko 45 Colorado Roan Plateau 45 subsalt cluster 45 deepwater exploratory wells 45 spokesman Matt Pitzarella 45 Cook Inlet basin 45 EnCana ECA 45 ExxonMobil XOM 45 flowback 45 underground coal seams 45 supermajor 45 Halliburton Loophole 45 contaminate aquifers 45 EOG 45 Schlumberger SLB 45 Hydraulic fracturing 45 mining 45 landman 45 Chesapeake Appalachia 45 Diamond Offshore DO 45 Transocean RIG 45 Anadarko Mitsui 45 contractor Atwood Oceanics 45 Ensco Offshore Co. 44 EnCana 44 Galisteo Basin 44 Halliburton Co HAL.N 44 hydrocarbon reservoirs 44 mineral extraction 44 underground shale formations 44 hydraulically fracturing 44 Exxon XOM 44 uncompleted wells 44 oilsands 44 Todco THE 44 directionally drill 44 BP BP.L Quote 44 Deepwater Horizon disaster 44 shale leasing 44 Shell Chukchi 44 Diamond Offshore Drilling 44 microseismic 44 Supermajors 44 roughnecks 44 carbonate reservoirs 44 Plains Exploration 44 Cimarex 44 ConocoPhillips COP.N Quote 44 Helix Energy 44 Kuparuk 44 trona 44 Orphan Basin 44 Chevron CVX.N 44 Niobrara formation 44 Minerals Management 44 outer Continental Shelf 44 Kathryn Klaber president 44 briny wastewater 44 Chicontepec 44 nationalizing Bolivia 44 McMoRan Exploration 44 Todco 44 Cabot Oil 44 COP.N 44 Milagro Exploration 44 Roan Plateau 44 Marcellus Shale Coalition 44 Anadarko Petroleum Corp. 44 Noble Corp NE.N 44 Nenana Basin 44 National Oilwell Varco NOV 44 Petrogen 44 Drunkard Wash 44 spokesman Randy Teeuwen 43 Ammazzo 43 Matoushek 43 Eagleford 43 coal seams 43 ultradeep waters 43 Piceance basin 43 wellbores 43 Petrobras 43 bearing sandstones 43 inject slurry 43 shales 43 OGX 2A 43 Secretary Ken Salazar 43 Lona O 43 shale tar sands 43 Apache Corp APA.N 43 deepwater exploration 43 exploratory drilling 43 Patterson UTI PTEN 43 frac fluids 43 CHK.N 43 downhole 43 contractor Nabors Industries 43 enviros 43 hydraulic fracturing fluids 43 fracing fluids 43 Paradox Basin 43 NYSE NBR 43 Dan Naatz 43 hydrocarbons 43 unconventionals 43 Mamm Creek Field 43 drillstring 43 Piceance Basin 43 Exxon Mobil NYSE XOM 43 Keathley Canyon block 43 hardrock mining 43 ASX BLY 43 Schlumberger Ltd SLB.N 43 Ensco 43 offshore drilling rigs 43 coal seam 43 reinjection 43 Barnett shale 43 GMX Resources 43 Anschutz Exploration 43 Cook Inlet Basin 43 XTO Energy 43 oilmen 43 Horizontal wells 43 Kerr McGee 43 categorical exclusions 43 Ensco International 43 Chevron NYSE CVX 43 Utica shale 43 permitorium 43 Denbury Resources 43 Barnett Shale wells 43 shale basins 43 Halliburton Schlumberger 43 Deepwater Horizon 43 Vermillion Basin 43 BP Prudhoe Bay 42 Pantheon Resources 42 frac fluid 42 lucrative Marcellus Shale 42 driller Ensco International 42 deepwater rigs 42 hydrocarbon 42 geologists 42 drill 42 Toroa prospect 42 wellhead 42 booms skimmers 42 outer continental shelf 42 Anadarko Petroleum APC.N 42 oilpatch 42 Baxter Shale 42 Fayetteville Shale Play 42 Barnett Shale formation 42 Halliburton HAL 42 Ensco Plc 42 East Rinnes 42 Transocean Diamond Offshore 42 ProGas Energy 42 ENSCO International 42 onshore shale formations 42 VIC/P# 42 Bakken horizontal 42 Schlumberger 2Q 42 Mirador formation 42 drilling muds 42 appraisal sidetrack 42 FRAC Act 42 frac 42 Eagleford Shale 42 landowners 42 offshore 42 COGA 42 tar sands 42 bed methane 42 wildcatter 42 Granite Wash formation 42 Schlumberger SLB.N 42 EncapSol 42 Pluspetrol 42 deepwaters 42 Petrohawk Energy 42 Rowan RDC 42 CNX Gas 42 Fountain Quail 42 deepwater discoveries 42 horizontal wells 42 Exxon Mobil Corp XOM.N 42 booming Bakken Shale 42 Glen Rose Porosity 42 Frac Tech 42 frack flowback 42 drillpipe 42 Marcellus shales 42 oilwell 42 North Falkland Basin 42 Cana Woodford Shale 42 Haynesville shale wells 42 oil monopoly Pemex 42 Colorado Piceance Basin 42 Energy DVN 42 Schlumberger NYSE SLB 42 Bowleven 42 Woodford Shale 42 Schlumberger 42 Morales nationalized 42 Gas COG 42 Valiant Petroleum 41 Fracture stimulation 41 BP 41 Utica Shale 41 rig 41 Patterson UTI 41 EXCO Resources 41 subsalt 41 NIOB interval n 41 driller Rowan 41 Marcellus acreage 41 Mangahewa 41 TriAxon 41 Calliope Gas 41 Sanish wells 41 Transocean Ltd. RIG 41 oilfields 41 Bromwich 41 EOG Resources EOG 41 Fayetteville Shale 41 Oooguruk 41 LKC interval n 41 Cardium formation 41 proppants 41 Chuckchi Sea 41 Mamm Creek 41 Transocean RIG.N 41 Granite Wash wells 41 Marcellus Haynesville 41 Nasdaq BEXP 41 drillings 41 Matt Staffel 41 Andarko 41 explorationists 41 coal miners 41 anthracite mines 41 ConocoPhillips 41 Duvernay shale 41 Pemex 41 Encana ECA 41 XTO Energy XTO 41 Bakken Formation 41 ranchers 41 Cana Woodford 41 offshore driller 41 Exxon Mobil 41 Montney Doig 41 Spain Repsol YPF 41 Keystone Mudlogging LLC 41 Deepwater rig 41 Anadarko Petroleum Corp APC.N 41 wellheads 41 Enforcement BOEMRE 41 Orinoco belt 41 bituminous mines 41 Tengasco 41 drilling horizontal wells 41 AKD# appraisal 41 Bakken Shale formation 41 hydrate deposits 41 ultra deepwater 41 Thaeler 41 BP Macondo well 41 Oceaneering International 41 Nabors Industries NYSE 41 horizontal Haynesville wells 41 operated horizontal wells 41 shallower formations 41 injection wells 41 refiners 41 Haynesville shale 41 Deepwater Horizon rig 41 utives 41 Anvil Points 41 explorers 41 drilling moratoriums 41 coalbeds 41 Spokesman Hari Sevugan 41 Macondo 41 NYSE CHK 41 Shell RDSB 41 Hydrofracking 41 sidetrack appraisal 41 Orinoco basin 41 hydraulically fractured 41 BP Plcâ 41 offshore Tupi 41 Parnaiba basin 40 Tar sands 40 fracked 40 Lower Bossier Haynesville 40 seismic surveys 40 Particle Impact 40 Ken Salazar 40 reaping bonanza 40 Deepwater Horizon semi submersible 40 Energy Corp DVN.N 40 EOG Resources Inc EOG.N 40 ExxonMobil NYSE XOM 40 sidetrack drilling 40 HOUSTON Schlumberger Ltd. 40 Whiting Petroleum 40 IOCs 40 Bakken formation 40 Oil Shale 40 downhole drilling 40 saltwater disposal 40 Dawson Geophysical Nasdaq DWSN 40 thirsty Front Range 40 producer XTO Energy 40 hydraulic fracing 40 subsurface 40 Petrobras PBR 40 companies 40 Pinedale Anticline 40 pump jacks 40 Zosh Road 40 Alaska Chukchi Sea 40 OMLs 40 unissued leases 40 BP Plc BP.L 40 Petroleo Brasileiro PBR 40 idled rigs 40 wildcatting 40 Allenergy 40 NYSE RRC 40 Bob Elderkin 40 nonproducing leases 40 Schlumberger Ltd 40 AOGCC 40 Ellenburger 40 Exxon Mobil XOM.N 40 BP PLC BP.LN 40 PINKSHEETS MGLG 40 Mahogany Deep 40 Pemex PEMX.UL 40 Fayetteville Shale acreage 40 Desire Petroleum 40 Tianwaitian field 40 XTO Energy Inc. 40 ENSTAR 40 deepwater exploratory 40 Ensco NYSE ESV 40 Newfield Exploration NYSE NFX 40 rig exploded 40 gushers 40 Al Jariya 40 Petrosearch 40 Scott Hanold 40 blowout preventers 40 Atoka formations 40 Transocean Ltd RIG.N 40 Wolfcamp formations 40 Energy NYSE DVN 40 Duroc Danner 40 Genwal 40 Ozona Northeast 40 Niobrara formations 40 Arctic Refuge 40 Denbury Resources DNR 40 Lower Oligocene 40 ConocoPhillips COP 40 northern Alberta oilsands 40 Chukchi Sea leases 40 horizontal Haynesville shale 40 Penneco 40 petrophysical analysis 40 Coal Seam Gas 40 shallower Cretaceous 40 Shell RDS.A 40 Rowan Cos. 40 Bakken wells 40 Seahawk Drilling Inc. 40 Sisskin continues 40 Dave Neslin 40 Encana Corp. 40 subsea dispersants 40 Petróleo Brasileiro SA 40 WhitMar 40 MegaWest 40 gas 40 Kinder Morgan KMP 40 Flatrock discovery 40 BP BP.L BP.N 40 Amerada 40 SLB Quote Chart 40 Oilsands 40 Greka 40 downhole motors 40 Transocean 40 coal seam gas 40 Exxon 40 Vaalco 40 leased Deepwater Horizon 40 Otero Mesa 40 Alaska Prudhoe Bay 40 UK Continental Shelf 40 frac plugs 40 frac sand 40 Talisman Energy 40 Osyka Corporation 40 Wabiskaw McMurray 40 Kalegran 40 reservoir sandstones 40 Drillers 40 multi frac 40 Kathryn Klaber 40 hydrocarbon bearing sandstones 40 robotic submersibles 40 Questerre 40 slickwater 40 Repsol YPF REP 40 Williston basin 40 horizontal Niobrara 40 Lysle Brinker 40 drillbit 40 basal sands 40 DEP 40 Woodford shale 40 Eresman 40 Chattanooga Shale 39 Baker Hughes BHI.N 39 oilsand 39 TETRA Technologies 39 hydrocarbon accumulations 39 hazardous liquids 39 Concho Resources 39 Prudhoe Bay 39 driller Diamond Offshore 39 Mississippian formation 39 Statoil STO 39 hydrocarbon saturation 39 Weatherford WFT 39 Hercules Offshore 39 EnCore Oil 39 Wyoming soda ash 39 Pan Andean 39 Macondo blowout 39 coal mining 39 rig Deepwater Horizon 39 Marcellus Shale Formation 39 gusher 39 Chevron Corp 39 Palo Duro Basin 39 drill rig 39 Cinco Terry 39 McMoRan 39 Engelder 39 Mudlogging 39 Exxon Mobil XOM 39 Hornbeck Offshore Services 39 Deep Bossier 39 Orinoco Belt 39 Niakuk 39 ill fated Deepwater Horizon 39 Acacia Este 39 exploration 39 StatoilHydro 39 Uintah Basin 39 shale sedimentary 39 Bakken Shale 39 Haynesville Fayetteville 39 mountaintop mining 39 Jolly Ranch 39 mountaintop removal mines 39 Hercules Offshore HERO 39 Denbury Resources Inc 39 Questar Exploration 39 ChevronTexaco CVX 39 Cairn 39 geoscientists 39 Salazar 39 Athabasca oilsands 39 carbonate reservoir 39 Skrugard 39 EOG Resources NYSE 39 Chayvo 39 Duvernay Oil Corp 39 ConocoPhillips Exxon Mobil 39 BLM 39 Atwood Oceanics 39 BP PLC Exxon Mobil 39 Amfire 39 Annell Bay 39 Colony Granite Wash 39 matrix porosity 39 workovers recompletions 39 midwater 39 Brigham Exploration 39 Powder River basin 39 Deepwater Horizon explosion 39 Tetra Technologies 39 NYSE RDC 39 BP PLC BP 39 deepwater Gulf 39 GMXR 39 Denver Julesburg basin 39 Mowry Shale 39 Antero Resources 39 fracs 39 prolific Barnett Shale 39 Empyrean Energy 39 permeability reservoir 39 Ghawar field 39 Uinta Basin 39 skimmers booms 39 extractive industries 39 Albacora Leste 39 Teikoku Oil 39 Nabors Industries Ltd. 39 Schlenker Goodrich 39 LON RRL 39 Bruce Hinchey 39 Washakie Basin 39 Exxon Mobil Corp 39 Jackup rigs 39 Fracturing 39 contractor GlobalSantaFe 39 CEO Aubrey McClendon 39 Titusville Pa. 39 Inc. PINKSHEETS EESV 39 gasline 39 Lagosta 39 Energy XXI 39 Schlumberger Ltd. NYSE SLB 39 refiner Sunoco Inc. 39 Consol 39 QEP Resources 39 Canext 39 ultradeepwater 39 riser insertion tube 39 Tupi discovery 39 DCNR 39 Hilcorp Energy 39 Robot submarines 39 flammable methane 39 Global SantaFe 39 Clyde Boudreaux 39 Trinity Aquifer 39 Mexico GOM 39 Statoil ASA 39 BP Macondo 39 Anticline 39 NYSE GSF 39 directional drillers 39 onshore Chicontepec 39 Elm Coulee 39 Nabors Industries 39 Spraberry Trend 39 BP Plc BP.N 39 GlobalSantaFe GSF 39 SeaDrill Ltd. 39 Ultra Petroleum 39 PetroEcuador 39 horizontal wellbores 39 Atwood Oceanics ATW 39 situ leach mining 39 Bronco Drilling 39 Exxon Mobil Chevron 39 ExxonMobil Chevron 39 Chevron CVX Fortune 39 Uddyback Fortson 39 toxic chemical dispersant 39 Tudor Pickering 39 Tullow Oil Plc 39 Cordero Rojo mines 39 Uinta basin 39 Boart Longyear Ltd 39 NOIA 39 nationalize Bolivia 39 fraced 39 Longwall mining 39 Brazil Campos Basin 39 AGIA 39 runaway Macondo 39 Yegua formation 39 Rheochem PLC 39 Shale formations 39 Precision Drilling 39 uphole 38 Lower Tertiary 38 Bossier Haynesville 38 AMEX UPL 38 nonproducing 38 Haynesville 38 undrilled prospects 38 coal liquification 38 Venezuela Orinoco Belt 38 Quinn 3H 38 EnCana Corp. 38 Dawson Geophysical 38 centralisers 38 Gulftex Operating Inc. 38 Onshore Drilling 38 Teikoku Oil Co. 38 wellsite 38 WVDEP 38 Inc ESV 38 Montara oilfield 38 Outer Continental Shelf 38 Simpson Dolomite 38 Ellora Energy 38 PADEP 38 National Oilwell Varco 38 Arctic outer continental 38 sudden inundation 38 Medanito Sur block 38 Betsy Mallison spokeswoman 38 ReedHycalog 38 tight sandstone formations 38 Gas FOGL 38 Questar 38 BLM Pinedale 38 Montney formation 38 Wattenberg Field 38 Athabasca tar sands 38 firms 38 Oil explorer Tullow 38 Devon NYSE DVN 38 Quecreek 38 Deepwater 38 Cardium horizontal wells 38 BPZ 38 Three Forks Sanish 38 Italy ENI ENI.MI 38 explorer Rockhopper 38 Wireline logs 38 Gas KOG 38 Deepwater Horizon blowout 38 Nikaitchuq 38 windfall profits 38 Freudenthal 38 GlobalSantaFe Corp. 38 Danenberger 38 Ozark Aquifer 38 W.Va. mine 38 Seahawk Drilling 38 PacRim Coal 38 TXCO 38 BP PLC BP BP.LN 38 Eirik Raude 38 Exxon Mobil Corp. 38 Gas Shales 38 situ extraction 38 Ammazzo prospect 38 Inc DO.N 38 CVX.N Quote Profile Research 38 Presco 38 Schlumberger Ltd. SLB 38 Statoil ASA Norway 38 LON BP 38 Canaguaro Block 38 Project Rulison 38 Scott Rotruck 38 environmentalists 38 GOM deepwater 38 Tecton Energy 38 Cimarex Energy 38 methane crystals 38 producer PetroChina #.HK 38 seafloor irreparably 38 Ecosphere Ozonix 38 deepwater drilling rigs 38 Wolfcamp Shale 38 seismic 38 geosteering 38 Chief Executive Aubrey McClendon 38 Macondo wellhead 38 CBM wells 38 #-#-#-# W5M [002] 38 Rovuma basin 38 Devon DVN 38 PINEDALE 38 Nexen Inc 38 sandstone reservoirs 38 NYSE APC 38 Exxon XTO 38 Whitmar Exploration Co. 38 ANWR 38 XTO XTO 38 Obleski 38 methane hydrate deposits 38 Dril Quip 38 Venezuela Orinoco belt 38 Rio Ariari 38 Petrobas 38 Niobrara 38 Antrim shale 38 sulfide mining 38 BP PLC ConocoPhillips 38 Gas Leases 38 horizontal wells drilled 38 Likonde 1 38 heater treater 38 Kasamene 38 Monterey Shale 38 Yellowstone snowmobile 38 extractors 38 Nockamixon 38 Exco Resources 38 fracking wastewater 38 Pendill 38 pit cyanide leach 38 workover rig 38 ACOR PEL 38 horizontal Mississippian 38 gravel quarries 38 GeoMet 38 underbalanced 38 Rockhopper Exploration 38 Arctic Coastal Plain 38 drilled horizontally 38 Seisma Oil Research 38 Outer Continental shelf 38 Gene Isenberg 38 Niobrara Shale formation 38 nationalization decree 38 drillsites 38 Haynesville acreage 38 GlobalSantaFe 38 WBEXT 1A 38 Enap 38 Muthero 38 BP PLC 38 Grant Prideco 38 Chiguiro Este 38 Valle Vidal 38 fracturing fluid 38 RIG.N 38 brine 38 cyanide heap leaching 38 economically exploitable 38 Transocean Deepwater Horizon 38 Grizzly Bluff 38 Carrizo Oil 38 wells spudded 38 PXP 38 Canadon Seco 38 longwall mines 38 Bossier formations 38 Val Verde Basin 38 hydro carbons 38 International Ltd WFT.N 38 Uranerz Energy 38 TSX CVE 38 bedrock aquifers 38 horizontal Cardium wells 38 Patterson UTI Energy 38 Venoco 38 Apache APA 38 Lower Oligocene reservoir 38 SandRidge Energy Inc 38 Empresa Nacional del 38 Wyoming 38 Brigham Exploration Co. 38 monopoly Pemex 38 Consol Energy 38 Bossier shales 38 Teledrift 38 Oilfield 38 Viola Limestone 38 venting methane 38 Vittitow 38 Sergipe Alagoas 38 Leor Energy 38 Quicksilver Resources KWK 38 Newfield Exploration Company 38 Mesaverde Formation 38 -MI6 MI5 38 Vetco Gray 38 Chevron Corp CVX.N 38 Adm Allen 38 contractors 38 Amec LON AMEC 38 analyst Fadel Gheit 38 Breitling Oil 38 driller Range 38 drill rigs 38 Appalachian Basin 38 Sivulliq 38 Campos Basin 38 recompleted wells 38 Mason Tract 38 Dan O. Dinges 38 sage grouse mating 38 Discoverer Enterprise flares 38 Kovytka 38 anticompetitive anticonsumer conduct 38 nat gas 38 Browse basin 38 Williston Basin 38 Severance Tax 38 deducting royalties 38 Shenzi field 38 Pacific Rubiales 38 Fayetteville shales 38 Chad Deaton 38 cyanide heap leach 38 NGI Shale Daily 38 Cubapetroleo 38 production drilling oilservice 38 Pasquia Hills oil 38 Gething Formation 38 WellDog 38 drugmakers 38 Chairman Jim Mulva 38 Rocksource 38 onshore 38 geologic formations 38 DRBC 38 Rancher Energy 38 Precision Drilling Trust 38 Fadel Gheit 38 vertical wellbore 37 Dancsok 37 groundwater pumpers 37 coal mines 37 Molvar 37 jackup rig fleet 37 GlobalSantaFe Corporation 37 Ltd. TSX CNQ 37 Santos Basin 37 Carbo Ceramics CRR 37 Chief Executive Randy Eresman 37 Themig 37 Escopeta 37 Terry Engelder 37 ExxonMobil XOM.N 37 methane hydrates 37 nahcolite 37 offshore oilfields 37 AltaCanada 37 Valero NYSE VLO 37 Anadarko APC 37 rotary rigs 37 Rockhopper Exploration LON RKH 37 Michael Bromwich 37 Geoffrey Thyne 37 Kiskatinaw 37 Wyomingites 37 Shale Gas 37 Petrohawk 37 BP BP.N 37 UnionTown 37 Diamond Offshore 37 petrophysical 37 Leni Gas 37 Dave Neslin acting 37 MONTCOAL W.Va. Crews 37 CHARLESTON W.Va. Coal 37 Doyon Drilling 37 undersea gusher 37 CX# #XD 37 Faroe Petroleum 37 Nganzi block 37 Ku Maloob Zaap 37 Permian basin 37 leaking riser 37 Spain Repsol 37 Haynesville shales 37 sidewall cores 37 Cardium wells 37 explorer BG 37 pipeliners 37 Petroleo Brasileiro SA 37 Christopher Gaut