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Clients

AEP-WOODFORD

AMERICAN ENERGY PARTNERS

ANADARKO PETROLEUM

ANSCHUTZ EXPLORATION CORPORATION

APACHE CORPORATION

ARENA RESOURCES INC.

ARMOR ENERGY LLC

AVALON EXPLORATION INC

AXIO NATURAL RESOURCES

AXIS ENERGY CORPORATION

BALLARD PETROLEUM

BANNER OIL  AND GAS

BARBOUR ENERGY CORPORATION

BBX OPERATING, LLC

BEAR MOUNTAIN RESOURCES LLC

BEASLEY OIL COMPANY

BHP

BINGER OPERATIONS, LLC

BISON EXPLORATION LP

BLUESTONE NATURAL RESOURCES

BNK PETROLEUM (US) INC

BOLD ENERGY

BOPCO

BP AMERICA PRODUCTION COMPANY

BRAVO NATURAL GAS, LLC

BRAVO NATURAL RESOURCES

BRIGHT HORIZON RESOURCES LLC

BURLINGTON RESOURCES OIL & G

BURNETT OIL COMPANY

CALLON PETROLEUM COMPANY

CANYON CREEK RESOURCES LLC

CAPSTONE ENERGY

CAPSTONE NATURAL RESOURCES

CARL E. GUNGOLL EXPLORATION

CASILLAS OPERATING LLC

CASTELLI EXPLORATION, INC.

CDX GAS LLC

CERTEX USA, INC.

CHAPARRAL ENERGY LLC

CHARTER OAK PRODUCTION CO.

CHESAPEAKE

CIMAREX ENEGRY COMPANY

CITATION OIL & GAS CORP.

CITRUS ENERGY CORP.

CLAYTON WILLIAMS ENERGY INC

COG OPERATING LLC

COMANCHE EXPLORATION CO., LLC

CONCHO EXPLORATION INC.

CONOCOPHILLIPS COMPANY

CONTINENTAL RESOURCES INC

CORDILLERA ENERGY

CORTERRA ENERGY OPERATING, LLC

CRAWLEY PETROLEUM

CROW CREEK ENERGY III LLC

CRUSADER ENERGY CORPORATION

DCP MIDSTREAM

DEVON ENERGY CORPORATION

DEWBRE PETROLEUM CORPORATION

DOMINION EXPLORATION

DUNCAN OIL PROPERTIES

EAGLE OIL & GAS COMPANY

EAGLE ROCK MID-CONTINENT

EL TORO RESOURCES

ELK RIVER RESOURCES

ELM RIDGE RESOURCES, INC.

ENCANA OIL & GAS USA

ENCORE ACQUISITION COMPANY

ENCORE OPERATING LP

ENERVEST OPERATING LLC

EOG RESOURCES INC.

EXCALIBUR RESOURCES LLC

FALCON EXPLORATION

FIDELITY EXPLORATION & PRODUCTION

FOREST OIL CORPORATION

FOSSIL CREEK ENERGY

FOUR SEAS EXPLORATION

FREEPORT-MCMORAN OIL & GAS

GASTAR EXPLORATION INC

GHK COMPANY

GLB EXPLORATION, INC.

GREAT PLAINS OPERATING LLC

GREAT WESTERN OPERATING CO LLC

GULFPORT ENERGY

GUNGOLL EXPLORATION

HALCON RESOURCES

HARDING & SHELTON INC.

HESS OHIO DEVELOPMENT

HIGHMOUNT EXPLORATION & PROD

J CLEO THOMPSON OIL & GAS

J.O.C. OPERATING, INC.

JONES ENERGY

KAISER-FRANCIS

KCS RESOURCES, INC.

KERNS PETROLEUM, INC.

KEY PRODUCTION COMPANY, INC.

KILLAM OIL COMPANY LTD

KINDER MORGAN

KINGFISHER RESOURCES, INC.

KIRKPATRICK OIL COMPANY

LARIAT PETROLEUM

LATIGO PETROLEUM, INC.

LE NORMAN OPERATING LLC

LINN ENERGY

LARADO PETROLEUM

MACK ENERGY

MALLARD OIL & GAS

MARATHON OIL COMPANY

MATADOR PRODUCTION COMPANY

MID-CONTINENT ENERGY CORPORATION

MIDSTATES PETROLEUM

MT DORA ENERGY LLC

MUSTANG FUEL CORPORATION

NADEL & GUSSMAN, LLC

NEMAHA OIL & GAS LLC

NEW DOMINION LLC

NEWFIELD MID-CONTINENT

NOBLE ENERGY PRODUCTION INC.

OCCIDENTAL OF ELK HILLS, INC

OXY USA INC

PABLO ENERGY II LLC

PANTHER ENERGY COMPANY, LLC

PARALLEL ENERGY LP

PENN VIRGINIA MC ENERGY, LLC

PENN VIRGINIA OIL & GAS

PEREGRINE PETROLEUM PARTNERS

PERMIAN RESOURCES LLC

PETROHAWK ENERGY CORPORATION

PETRO-HUNT LLC

PETROLEUM DEVELOPMENT CORPORATION

PETROQUEST ENERGY LLC

PIONEER NATURAL RESOURCES

PLAINS EXPLORATION & PRODUCTION

POGO ENERGY, INC.

PREMIER NATURAL RESOURCES INC

PRIDE ENERGY COMPANY

PRIMARY NATURAL RESOURCES

PRODIGY OIL AND GAS

PRODUCTION GATHERING COMPANY

PROTEGE ENERGY LLC

QEP ENERGY COMPANY

QUESTAR EXPLORATION & PRODUCTION

RAM ENERGY, INC.

RAMSEY PROPERTY MGMT, LLC

RANGE RESOURCES CORPORATION

REBELLION ENERGY LLC

RED MOUNTAIN OPERATING LLC

REX ENERGY OPERATING CORPORATION

RICKS EXPLORATION INC.

RILEY EXPLORATION OPERATING

RILEY PERMIAN OPERATING CO LLC

RIMROCK RESOURCE OPERATING LLC

RKI EXPLORATION & PRODUCTION

ROCKCLIFF ENERGY LLC

ROSETTA RESOURCES OPERATING LP

SABINE OIL AND GAS LLC

SAMSON ENERGY

SAMSON RESOURCES

SANDRIDGE ENERGY INC.

SHERIDAN PRODUCTION CO LLC

SLAWSON EXPLORATION COMPANY

SM ENERGY

SOUTHERN INTERNATIONAL

SOUTHWEST ROYALTIES

SPELLER OIL CORPORATION

STEPHENS EXPLORATION INC

STEPHENS PRODUCTION CO

STORM CAT ENERGY

STROUD ENERGY

SUNBELT REPORTING & LITIGATI

SUNDOWN ENERGY LP

TALON OIL & GAS LLC

TAPSTONE ENERGY

TECOLOTE ENERGY

TERRA ENERGY PARTNERS LLC

TOKLAN OIL & GAS CORP.

TOM BROWN INC.

TRAIL RIDGE ENERGY PARTNERS

TRIAD ENERGY

TRILOGY OPERATING

TRINITY OPERATING (USG) LLC

TRIUMPH ENERGY PARTNERS LLC

UNIT PETROLEUM

VANGUARD NATURAL RESOURCES LLC

VINE OIL & GAS

VITRUVIAN EXPLORATION II, LL

WAGON WHEEL OPERATING LLC

WARD PETROLEUM CORPORATION

WARREN AMERICAN OIL COMPANY

WESTERN OIL & GAS

WHITE RIVER ENERGY

WHITE STAR PETROLEUM LLC

WHITING OIL & GAS CORPORATION

WHITING PETROLEUM CORPORATION

WILDHORSE RESOURCES LLC

WILLIFORD ENERGY COMPANY

WINDSOR ENERGY

WPX ENERGY

WYNN-CROSBY ENERGY, INC.

XTO ENERGY

XTO ENERGY INC – PERMIAN

YALE OIL ASSOCIATES, INC.