World drilling industry register — contractors, operators, basins, regulators

Drilling contractors — Middle East and North Africa

Where the land rig count is concentrated. Gulf contractors run some of the largest land fleets in the world, most of them on long-term contracts to a single national oil company. Ownership is frequently part-state, part-international.

Contractor	Base	Fleet character	Note
ADNOC Drilling	United Arab Emirates	Land, island and offshore jackups	The region's largest driller by rig count. Part-listed on ADX, drills almost exclusively for ADNOC.
Arabian Drilling Company	Saudi Arabia	Land and offshore jackups	Listed on Tadawul. Long-standing Aramco contractor, formerly a Schlumberger joint venture.
Saudi Aramco Nabors Drilling (SANAD)	Saudi Arabia	Land	Joint venture between Saudi Aramco and Nabors, building a large purpose-built land fleet.
Arabian Drilling & Logistics (ADL)	United Arab Emirates	Land and workover	Regional land contractor. The fleet modelled in this platform.
Abraj Energy Services	Oman	Land and workover	Listed on the Muscat exchange. Principal PDO land contractor.
Dalma Energy	Oman / UAE	Land	Regional land driller working across Oman, Saudi Arabia and Iraq.
Gulf Drilling International	Qatar	Land, offshore jackup and lift boat	QatarEnergy affiliate, the country's principal driller.
Kuwait Drilling Company	Kuwait	Land	KOC's long-term land contractor.
Burgan Drilling	Kuwait	Land	Kuwaiti land contractor operating in the north and west of the country.
Egyptian Drilling Company	Egypt	Land, offshore jackup and barge	Joint venture with Maersk heritage. Works the Western Desert, Gulf of Suez and Nile Delta.
Sino Tharwa	Egypt	Land	Egyptian–Chinese joint venture drilling in the Western Desert.
ENAFOR / ENTP	Algeria	Land	Sonatrach's drilling subsidiaries, working the Sahara fields.
Iraq Drilling Company	Iraq	Land	State drilling company under the Ministry of Oil.
Weatherford, SLB, Halliburton, Baker Hughes	International	Integrated services, some rigs	Service majors. Compete with contractors on integrated well delivery.

Drilling contractors — offshore and international

The floating fleet is a small, consolidated market. Ultra-deepwater drillships and harsh-environment semis are owned by a handful of companies, and day rates move with the oil price faster than anything else in the industry.

Contractor	Base	Fleet character	Note
Transocean	Switzerland / United States	Ultra-deepwater drillships and harsh-environment semis	The largest offshore floater fleet. Holds several water-depth records.
Valaris	United Kingdom / United States	Drillships, semis and jackups	Formed from the Ensco and Rowan merger. Broadest offshore fleet mix.
Noble Corporation	United Kingdom / United States	Drillships, semis and jackups	Merged with Maersk Drilling. Strong North Sea and deepwater presence.
Seadrill	Norway / Bermuda	Drillships and semis	Deepwater focus across Brazil, West Africa and the Gulf of Mexico.
Borr Drilling	Norway / Bermuda	Modern jackups only	Pure-play premium jackup fleet.
Shelf Drilling	United Arab Emirates	Shallow-water jackups	Acquired much of the older Transocean jackup fleet. Middle East, India and West Africa.
Odfjell Drilling	Norway	Harsh-environment semis and platform drilling	North Sea and Barents specialist.
Diamond Offshore	United States	Deepwater floaters	Long-established floater operator.
Vantage Drilling	Cayman / United States	Drillships and jackups	Managed and owned units.
COSL	China	Jackups, semis and land rigs	CNOOC's drilling arm, and one of the largest fleets worldwide.
ADES	Saudi Arabia	Jackups, land and workover	Listed in Riyadh. Rapid recent expansion across MENA.
Maersk Drilling	Denmark	Harsh-environment	Merged into Noble; the brand persists in North Sea contracting.

Drilling contractors — Americas, Asia, Europe and Africa

Land drilling is a fragmented, regional business. Outside the Gulf, most land contractors work a single basin or country, and the largest fleets are concentrated in North America's unconventional plays.

Contractor	Base	Fleet character	Note
Nabors Industries	United States	Land, international land, some offshore	One of the world's largest land fleets, operating on five continents.
Patterson-UTI	United States	Land, US unconventional	Large US pad-drilling fleet with integrated pressure pumping.
Helmerich & Payne	United States	Land, high-specification	Known for the FlexRig class and a strong automation position.
Precision Drilling	Canada	Land, Canada and United States	Largest Canadian land contractor.
Ensign Energy Services	Canada	Land, international	Canada, United States, Australia, Middle East and Latin America.
Independence Contract Drilling	United States	Land, Permian and Haynesville	US pad drilling.
Perforadora México / Grupo R	Mexico	Land and offshore jackups	Principal Pemex contractors.
Estrella International	Argentina	Land	Vaca Muerta and conventional Argentine basins.
San Antonio Internacional	Argentina	Land	Latin American land drilling and workover.
Foraco / Boart Longyear / Major Drilling	Canada / France	Mineral exploration	The three largest mineral drilling contractors worldwide.
KCA Deutag	United Kingdom	Land, offshore platform and engineering	Strong Middle East land and North Sea platform position.
Saipem	Italy	Land, offshore, drilling and construction	Integrated E&C contractor with a drilling division.
Sinopec / CNPC drilling engineering	China	Land, very large fleets	Domestic Chinese drilling plus international contracts across Africa, Middle East and Central Asia.
ONGC / Oil India drilling	India	Land and offshore	State-operated departmental rigs alongside contracted units.
Eurasia Drilling Company	Russia / Cyprus	Land and offshore	Largest independent Russian driller.
Weatherford Land Rigs	International	Land	Legacy land fleets in the Middle East and North Africa.

National oil companies

NOCs hold most of the world's reserves and let most of the world's drilling contracts. Their reporting formats, HSE codes and procurement rules shape how a contractor operates far more than any international standard does.

Company	Country	Character	Note
Saudi Aramco	Saudi Arabia	Fully integrated, largest producer	Sets SAES and SAEP engineering standards used across its supply chain.
ADNOC	United Arab Emirates	Integrated, onshore and offshore	Codes of Practice govern well integrity and drilling. Strong ICV procurement policy.
QatarEnergy	Qatar	Gas-led, LNG	North Field operations and expansion.
Kuwait Oil Company	Kuwait	Upstream arm of KPC	Long-term land drilling contracts, heavy oil development in the north.
Petroleum Development Oman	Oman	Shell-affiliated operator	SP and GU specification series widely referenced in the region.
Bapco / Tatweer	Bahrain	Onshore and offshore	Awali field redevelopment.
NOC Libya / AGOCO / Waha	Libya	Onshore, Sirte basin	Operating through joint ventures.
Sonatrach	Algeria	Integrated, Saharan	Owns ENAFOR and ENTP drilling subsidiaries.
EGPC / EGAS / Ganope	Egypt	Holding companies	License and partner with international operators.
NNPC	Nigeria	Integrated	Onshore delta, shallow and deepwater joint ventures.
Sonangol	Angola	Concessionaire and operator	Deepwater blocks offshore.
Petrobras	Brazil	Deepwater and pre-salt leader	Among the most demanding deepwater specifications anywhere.
Pemex	Mexico	Integrated	Onshore, shallow Gulf of Mexico and Chicontepec.
Ecopetrol	Colombia	Integrated	Llanos and Magdalena basins.
PDVSA	Venezuela	Integrated	Orinoco heavy oil belt and Lake Maracaibo.
CNPC / PetroChina, Sinopec, CNOOC	China	Three state majors	Domestic plus extensive international operations.
ONGC / Oil India	India	State upstream	Onshore, Mumbai High and KG basin.
Petronas	Malaysia	Integrated, international	Operator and licensor, with PTS technical standards.
Pertamina	Indonesia	Integrated	Mature onshore and offshore fields.
PTTEP	Thailand	Upstream	Gulf of Thailand and international.
KazMunayGas	Kazakhstan	Integrated	Caspian and onshore fields.
SOCAR	Azerbaijan	Integrated	Caspian operations.
Rosneft, Gazprom, Lukoil, Tatneft	Russia	Major producers	Western Siberia, Volga-Urals and Arctic.
Equinor	Norway	Part-state, international	North Sea, Barents and international deepwater.
Petoro / Gassco	Norway	State interest management	Hold and manage state participation rather than operate.
NIOC	Iran	Integrated	Onshore Khuzestan and offshore Gulf fields.
Basra Oil Company	Iraq	Southern fields	Rumaila, West Qurna, Zubair development.

International operators and independents

The companies that write the drilling programme. Most contractor reporting formats are ultimately the operator's format, which is why a contractor working for several of them ends up typing the same day into several different templates.

Company	Base	Character	Note
ExxonMobil	United States	Supermajor	Guyana, Permian, Papua New Guinea, deepwater West Africa.
Chevron	United States	Supermajor	Permian, Gulf of Mexico, Kazakhstan, Australia LNG.
Shell	United Kingdom / Netherlands	Supermajor	Deepwater, LNG, and a large technical standards library.
bp	United Kingdom	Supermajor	Gulf of Mexico, Azerbaijan, Oman, North Sea.
TotalEnergies	France	Supermajor	West Africa, Middle East, LNG. Operates its own DrillX well-delivery platform.
Eni	Italy	Integrated	North Africa, Mozambique, Egypt Zohr.
ConocoPhillips	United States	Independent	Alaska, Permian, Qatar LNG.
Occidental	United States	Independent	Permian, Oman, UAE, with a large CO₂-EOR position.
Woodside	Australia	Independent	North West Shelf, Scarborough, Senegal.
Santos	Australia	Independent	Cooper basin, Barossa, PNG.
Repsol	Spain	Integrated	North Africa, Latin America, Gulf of Mexico.
OMV	Austria	Integrated	Central Europe, Norway, UAE, New Zealand.
Wintershall Dea	Germany	Independent	North Sea, North Africa, Argentina.
Aker BP	Norway	Independent	Norwegian continental shelf.
Harbour Energy	United Kingdom	Independent	North Sea and international.
Dragon Oil	United Arab Emirates	ENOC subsidiary	Turkmenistan Caspian, Egypt and Iraq.
Crescent Petroleum / Dana Gas	United Arab Emirates	Regional independent	Sharjah, Kurdistan, Egypt.
Mubadala Energy	United Arab Emirates	Investment-led operator	Southeast Asia and MENA.
Kufpec	Kuwait	KPC international arm	International exploration and production.
Vaalco, Kosmos, Tullow	International	Africa-focused independents	West African shallow and deepwater.

Major drilling basins and provinces

Where the wells actually are. A basin dictates the casing scheme, the mud system, the pore pressure regime and the rig class long before anyone chooses a contractor.

Basin or province	Region	Character	Drilling consequence
Rub' al Khali / Eastern Province	Saudi Arabia	Giant carbonate oil and gas	Long horizontals in Arab-D carbonate, extensive maximum reservoir contact wells.
Abu Dhabi onshore and islands	United Arab Emirates	Thamama and Arab carbonates	High-angle development, sour gas, artificial islands for offshore access.
North Field / South Pars	Qatar / Iran	World's largest gas field	Sour gas, very high rate wells, large-bore completions.
Burgan and northern Kuwait	Kuwait	Giant clastic oil	Mature waterflood, heavy oil in the north.
Rumaila, West Qurna, Zubair	Iraq	Giant carbonate and clastic	Large-scale redevelopment, high rig demand.
Sultanate interior	Oman	Complex, tight and heavy oil	Small reservoirs, EOR, steam and polymer flooding.
Western Desert	Egypt	Clastic oil and gas	Numerous small fields, high well count, fast cycle.
Nile Delta and Mediterranean	Egypt	Deepwater gas	Zohr carbonate, deepwater exploration.
Hassi Messaoud / Hassi R'Mel	Algeria	Giant oil and gas	Deep, hard drilling, remote Saharan logistics.
Sirte	Libya	Oil	Mature fields, security-constrained operations.
Niger Delta	Nigeria	Oil and gas, onshore to deepwater	Swamp, shallow and deepwater. Barge and jackup work.
Kwanza and Lower Congo	Angola	Deepwater and pre-salt	Ultra-deepwater floaters, subsea development.
Santos and Campos	Brazil	Pre-salt carbonate	Deep water, thick salt, high CO₂ content, the world's most demanding drilling.
Permian	United States	Unconventional oil	The highest-intensity land drilling on earth. Pad drilling and long laterals.
Eagle Ford, Bakken, Haynesville, Marcellus	United States	Unconventional	Pad campaigns, fast rig moves, standardised well design.
Gulf of Mexico	United States / Mexico	Shelf and deepwater	Subsalt, high pressure high temperature, strict BSEE regulation.
Western Canadian Sedimentary Basin	Canada	Conventional, tight and oil sands	Montney, Duvernay, SAGD pairs.
Vaca Muerta	Argentina	Unconventional shale	Rapid growth, long laterals, logistics-constrained.
Llanos and Magdalena	Colombia	Conventional oil	Jungle and foothills logistics.
North Sea	UK / Norway / Denmark / Netherlands	Mature offshore	Harsh environment, high intervention and abandonment activity.
Barents Sea	Norway / Russia	Arctic frontier	Ice management, short season, strict environmental limits.
Western Siberia	Russia	Giant oil and gas	Very high well count, extreme cold, ice road logistics.
Caspian — Kashagan, Tengiz	Kazakhstan	Giant sour carbonate	Extreme H₂S, shallow ice-affected water, artificial islands.
Bohai Bay and South China Sea	China	Offshore oil and gas	Jackup and platform drilling, typhoon season.
Gulf of Thailand	Thailand	Shallow gas	Very high well count, small compartments, tender rigs.
Malay, Sarawak and Sabah	Malaysia	Offshore oil and gas	Jackup and tender-assist drilling.
Mumbai High and KG basin	India	Offshore oil and deepwater gas	Platform drilling and deepwater exploration.
North West Shelf, Browse, Carnarvon	Australia	Offshore gas	LNG feed, deepwater and long tiebacks.
Guyana-Suriname	Guyana / Suriname	Deepwater oil frontier	The fastest-growing deepwater province in the world.
East Africa — Rovuma, Tanzania	Mozambique / Tanzania	Deepwater gas	LNG development, security constraints.

Regulators, authorities and licensing bodies

Who has to approve the well. Every jurisdiction has a body that issues the permit, receives the reports and investigates the incidents. Their reporting format is often the one that matters most.

Authority	Jurisdiction	Role	Note
ADNOC / Supreme Council for Financial and Economic Affairs	United Arab Emirates	Concession and approval	Operator-led approval regime.
Ministry of Energy and Minerals	Oman	Licensing and approvals	Works with PDO and other concession holders.
Ministry of Energy and Infrastructure	United Arab Emirates	Federal energy policy	Federal-level oversight.
Saudi Ministry of Energy	Saudi Arabia	Policy and concession	Aramco operates under exclusive concession.
Bureau of Safety and Environmental Enforcement	United States	Offshore safety regulator	30 CFR 250 governs OCS operations.
Bureau of Land Management	United States	Onshore federal land	Permits wells on federal acreage.
Railroad Commission of Texas	United States	State regulator	Permits, reporting and abandonment in Texas.
North Dakota Industrial Commission	United States	State regulator	Bakken permitting and reporting.
Environmental Protection Agency	United States	Injection wells	UIC programme, Class II and Class VI.
Alberta Energy Regulator	Canada	Provincial	Directive 008, 059 and the well licence regime.
BC Energy Regulator	Canada	Provincial	Montney and northeast British Columbia.
North Sea Transition Authority	United Kingdom	Licensing	Well notification and consent.
Health and Safety Executive	United Kingdom	Offshore safety	Well examination scheme and safety case.
Petroleum Safety Authority / Havtil	Norway	Offshore safety	Enforces the Norwegian regulatory framework and NORSOK.
Norwegian Offshore Directorate	Norway	Resource management	Licensing and reporting.
Danish Energy Agency	Denmark	Licensing and safety	Danish sector.
State Supervision of Mines	Netherlands	Licensing and safety	Dutch onshore and offshore.
NOPSEMA	Australia	Offshore safety and environment	Well operations management plans.
ANP	Brazil	Regulator	Licensing, reporting and local content.
CNH	Mexico	Hydrocarbons commission	Contract and field development approval.
DGH	India	Upstream regulator	Field development plan approval.
MEMR / SKK Migas	Indonesia	Regulator and PSC management	Approves work programmes and budgets.
PPPA / Ministry	Malaysia	Petroleum arrangement	Petronas holds the resource; PSC framework.
NUPRC	Nigeria	Upstream regulator	Licensing and reporting under the PIA.
EAD / MOCCAE	United Arab Emirates	Environmental permits	Environmental approval for wellsite operations.
MECA	Oman	Environmental permits	Environmental approval and waste manifesting.

Drilling contractors — Middle East and North Africa

Contractor	Base	Fleet character	Note
ADNOC Drilling	United Arab Emirates	Land, island and offshore jackups	The region's largest driller by rig count. Part-listed on ADX, drills almost exclusively for ADNOC.
Arabian Drilling Company	Saudi Arabia	Land and offshore jackups	Listed on Tadawul. Long-standing Aramco contractor, formerly a Schlumberger joint venture.
Saudi Aramco Nabors Drilling (SANAD)	Saudi Arabia	Land	Joint venture between Saudi Aramco and Nabors, building a large purpose-built land fleet.
Arabian Drilling & Logistics (ADL)	United Arab Emirates	Land and workover	Regional land contractor. The fleet modelled in this platform.
Abraj Energy Services	Oman	Land and workover	Listed on the Muscat exchange. Principal PDO land contractor.
Dalma Energy	Oman / UAE	Land	Regional land driller working across Oman, Saudi Arabia and Iraq.
Gulf Drilling International	Qatar	Land, offshore jackup and lift boat	QatarEnergy affiliate, the country's principal driller.
Kuwait Drilling Company	Kuwait	Land	KOC's long-term land contractor.
Burgan Drilling	Kuwait	Land	Kuwaiti land contractor operating in the north and west of the country.
Egyptian Drilling Company	Egypt	Land, offshore jackup and barge	Joint venture with Maersk heritage. Works the Western Desert, Gulf of Suez and Nile Delta.
Sino Tharwa	Egypt	Land	Egyptian–Chinese joint venture drilling in the Western Desert.
ENAFOR / ENTP	Algeria	Land	Sonatrach's drilling subsidiaries, working the Sahara fields.
Iraq Drilling Company	Iraq	Land	State drilling company under the Ministry of Oil.
Weatherford, SLB, Halliburton, Baker Hughes	International	Integrated services, some rigs	Service majors. Compete with contractors on integrated well delivery.

Drilling contractors — offshore and international

Contractor	Base	Fleet character	Note
Transocean	Switzerland / United States	Ultra-deepwater drillships and harsh-environment semis	The largest offshore floater fleet. Holds several water-depth records.
Valaris	United Kingdom / United States	Drillships, semis and jackups	Formed from the Ensco and Rowan merger. Broadest offshore fleet mix.
Noble Corporation	United Kingdom / United States	Drillships, semis and jackups	Merged with Maersk Drilling. Strong North Sea and deepwater presence.
Seadrill	Norway / Bermuda	Drillships and semis	Deepwater focus across Brazil, West Africa and the Gulf of Mexico.
Borr Drilling	Norway / Bermuda	Modern jackups only	Pure-play premium jackup fleet.
Shelf Drilling	United Arab Emirates	Shallow-water jackups	Acquired much of the older Transocean jackup fleet. Middle East, India and West Africa.
Odfjell Drilling	Norway	Harsh-environment semis and platform drilling	North Sea and Barents specialist.
Diamond Offshore	United States	Deepwater floaters	Long-established floater operator.
Vantage Drilling	Cayman / United States	Drillships and jackups	Managed and owned units.
COSL	China	Jackups, semis and land rigs	CNOOC's drilling arm, and one of the largest fleets worldwide.
ADES	Saudi Arabia	Jackups, land and workover	Listed in Riyadh. Rapid recent expansion across MENA.
Maersk Drilling	Denmark	Harsh-environment	Merged into Noble; the brand persists in North Sea contracting.

Drilling contractors — Americas, Asia, Europe and Africa

Contractor	Base	Fleet character	Note
Nabors Industries	United States	Land, international land, some offshore	One of the world's largest land fleets, operating on five continents.
Patterson-UTI	United States	Land, US unconventional	Large US pad-drilling fleet with integrated pressure pumping.
Helmerich & Payne	United States	Land, high-specification	Known for the FlexRig class and a strong automation position.
Precision Drilling	Canada	Land, Canada and United States	Largest Canadian land contractor.
Ensign Energy Services	Canada	Land, international	Canada, United States, Australia, Middle East and Latin America.
Independence Contract Drilling	United States	Land, Permian and Haynesville	US pad drilling.
Perforadora México / Grupo R	Mexico	Land and offshore jackups	Principal Pemex contractors.
Estrella International	Argentina	Land	Vaca Muerta and conventional Argentine basins.
San Antonio Internacional	Argentina	Land	Latin American land drilling and workover.
Foraco / Boart Longyear / Major Drilling	Canada / France	Mineral exploration	The three largest mineral drilling contractors worldwide.
KCA Deutag	United Kingdom	Land, offshore platform and engineering	Strong Middle East land and North Sea platform position.
Saipem	Italy	Land, offshore, drilling and construction	Integrated E&C contractor with a drilling division.
Sinopec / CNPC drilling engineering	China	Land, very large fleets	Domestic Chinese drilling plus international contracts across Africa, Middle East and Central Asia.
ONGC / Oil India drilling	India	Land and offshore	State-operated departmental rigs alongside contracted units.
Eurasia Drilling Company	Russia / Cyprus	Land and offshore	Largest independent Russian driller.
Weatherford Land Rigs	International	Land	Legacy land fleets in the Middle East and North Africa.

National oil companies

Company	Country	Character	Note
Saudi Aramco	Saudi Arabia	Fully integrated, largest producer	Sets SAES and SAEP engineering standards used across its supply chain.
ADNOC	United Arab Emirates	Integrated, onshore and offshore	Codes of Practice govern well integrity and drilling. Strong ICV procurement policy.
QatarEnergy	Qatar	Gas-led, LNG	North Field operations and expansion.
Kuwait Oil Company	Kuwait	Upstream arm of KPC	Long-term land drilling contracts, heavy oil development in the north.
Petroleum Development Oman	Oman	Shell-affiliated operator	SP and GU specification series widely referenced in the region.
Bapco / Tatweer	Bahrain	Onshore and offshore	Awali field redevelopment.
NOC Libya / AGOCO / Waha	Libya	Onshore, Sirte basin	Operating through joint ventures.
Sonatrach	Algeria	Integrated, Saharan	Owns ENAFOR and ENTP drilling subsidiaries.
EGPC / EGAS / Ganope	Egypt	Holding companies	License and partner with international operators.
NNPC	Nigeria	Integrated	Onshore delta, shallow and deepwater joint ventures.
Sonangol	Angola	Concessionaire and operator	Deepwater blocks offshore.
Petrobras	Brazil	Deepwater and pre-salt leader	Among the most demanding deepwater specifications anywhere.
Pemex	Mexico	Integrated	Onshore, shallow Gulf of Mexico and Chicontepec.
Ecopetrol	Colombia	Integrated	Llanos and Magdalena basins.
PDVSA	Venezuela	Integrated	Orinoco heavy oil belt and Lake Maracaibo.
CNPC / PetroChina, Sinopec, CNOOC	China	Three state majors	Domestic plus extensive international operations.
ONGC / Oil India	India	State upstream	Onshore, Mumbai High and KG basin.
Petronas	Malaysia	Integrated, international	Operator and licensor, with PTS technical standards.
Pertamina	Indonesia	Integrated	Mature onshore and offshore fields.
PTTEP	Thailand	Upstream	Gulf of Thailand and international.
KazMunayGas	Kazakhstan	Integrated	Caspian and onshore fields.
SOCAR	Azerbaijan	Integrated	Caspian operations.
Rosneft, Gazprom, Lukoil, Tatneft	Russia	Major producers	Western Siberia, Volga-Urals and Arctic.
Equinor	Norway	Part-state, international	North Sea, Barents and international deepwater.
Petoro / Gassco	Norway	State interest management	Hold and manage state participation rather than operate.
NIOC	Iran	Integrated	Onshore Khuzestan and offshore Gulf fields.
Basra Oil Company	Iraq	Southern fields	Rumaila, West Qurna, Zubair development.

International operators and independents

Company	Base	Character	Note
ExxonMobil	United States	Supermajor	Guyana, Permian, Papua New Guinea, deepwater West Africa.
Chevron	United States	Supermajor	Permian, Gulf of Mexico, Kazakhstan, Australia LNG.
Shell	United Kingdom / Netherlands	Supermajor	Deepwater, LNG, and a large technical standards library.
bp	United Kingdom	Supermajor	Gulf of Mexico, Azerbaijan, Oman, North Sea.
TotalEnergies	France	Supermajor	West Africa, Middle East, LNG. Operates its own DrillX well-delivery platform.
Eni	Italy	Integrated	North Africa, Mozambique, Egypt Zohr.
ConocoPhillips	United States	Independent	Alaska, Permian, Qatar LNG.
Occidental	United States	Independent	Permian, Oman, UAE, with a large CO₂-EOR position.
Woodside	Australia	Independent	North West Shelf, Scarborough, Senegal.
Santos	Australia	Independent	Cooper basin, Barossa, PNG.
Repsol	Spain	Integrated	North Africa, Latin America, Gulf of Mexico.
OMV	Austria	Integrated	Central Europe, Norway, UAE, New Zealand.
Wintershall Dea	Germany	Independent	North Sea, North Africa, Argentina.
Aker BP	Norway	Independent	Norwegian continental shelf.
Harbour Energy	United Kingdom	Independent	North Sea and international.
Dragon Oil	United Arab Emirates	ENOC subsidiary	Turkmenistan Caspian, Egypt and Iraq.
Crescent Petroleum / Dana Gas	United Arab Emirates	Regional independent	Sharjah, Kurdistan, Egypt.
Mubadala Energy	United Arab Emirates	Investment-led operator	Southeast Asia and MENA.
Kufpec	Kuwait	KPC international arm	International exploration and production.
Vaalco, Kosmos, Tullow	International	Africa-focused independents	West African shallow and deepwater.

Major drilling basins and provinces

Where the wells actually are. A basin dictates the casing scheme, the mud system, the pore pressure regime and the rig class long before anyone chooses a contractor.

Basin or province	Region	Character	Drilling consequence
Rub' al Khali / Eastern Province	Saudi Arabia	Giant carbonate oil and gas	Long horizontals in Arab-D carbonate, extensive maximum reservoir contact wells.
Abu Dhabi onshore and islands	United Arab Emirates	Thamama and Arab carbonates	High-angle development, sour gas, artificial islands for offshore access.
North Field / South Pars	Qatar / Iran	World's largest gas field	Sour gas, very high rate wells, large-bore completions.
Burgan and northern Kuwait	Kuwait	Giant clastic oil	Mature waterflood, heavy oil in the north.
Rumaila, West Qurna, Zubair	Iraq	Giant carbonate and clastic	Large-scale redevelopment, high rig demand.
Sultanate interior	Oman	Complex, tight and heavy oil	Small reservoirs, EOR, steam and polymer flooding.
Western Desert	Egypt	Clastic oil and gas	Numerous small fields, high well count, fast cycle.
Nile Delta and Mediterranean	Egypt	Deepwater gas	Zohr carbonate, deepwater exploration.
Hassi Messaoud / Hassi R'Mel	Algeria	Giant oil and gas	Deep, hard drilling, remote Saharan logistics.
Sirte	Libya	Oil	Mature fields, security-constrained operations.
Niger Delta	Nigeria	Oil and gas, onshore to deepwater	Swamp, shallow and deepwater. Barge and jackup work.
Kwanza and Lower Congo	Angola	Deepwater and pre-salt	Ultra-deepwater floaters, subsea development.
Santos and Campos	Brazil	Pre-salt carbonate	Deep water, thick salt, high CO₂ content, the world's most demanding drilling.
Permian	United States	Unconventional oil	The highest-intensity land drilling on earth. Pad drilling and long laterals.
Eagle Ford, Bakken, Haynesville, Marcellus	United States	Unconventional	Pad campaigns, fast rig moves, standardised well design.
Gulf of Mexico	United States / Mexico	Shelf and deepwater	Subsalt, high pressure high temperature, strict BSEE regulation.
Western Canadian Sedimentary Basin	Canada	Conventional, tight and oil sands	Montney, Duvernay, SAGD pairs.
Vaca Muerta	Argentina	Unconventional shale	Rapid growth, long laterals, logistics-constrained.
Llanos and Magdalena	Colombia	Conventional oil	Jungle and foothills logistics.
North Sea	UK / Norway / Denmark / Netherlands	Mature offshore	Harsh environment, high intervention and abandonment activity.
Barents Sea	Norway / Russia	Arctic frontier	Ice management, short season, strict environmental limits.
Western Siberia	Russia	Giant oil and gas	Very high well count, extreme cold, ice road logistics.
Caspian — Kashagan, Tengiz	Kazakhstan	Giant sour carbonate	Extreme H₂S, shallow ice-affected water, artificial islands.
Bohai Bay and South China Sea	China	Offshore oil and gas	Jackup and platform drilling, typhoon season.
Gulf of Thailand	Thailand	Shallow gas	Very high well count, small compartments, tender rigs.
Malay, Sarawak and Sabah	Malaysia	Offshore oil and gas	Jackup and tender-assist drilling.
Mumbai High and KG basin	India	Offshore oil and deepwater gas	Platform drilling and deepwater exploration.
North West Shelf, Browse, Carnarvon	Australia	Offshore gas	LNG feed, deepwater and long tiebacks.
Guyana-Suriname	Guyana / Suriname	Deepwater oil frontier	The fastest-growing deepwater province in the world.
East Africa — Rovuma, Tanzania	Mozambique / Tanzania	Deepwater gas	LNG development, security constraints.

Regulators, authorities and licensing bodies

Who has to approve the well. Every jurisdiction has a body that issues the permit, receives the reports and investigates the incidents. Their reporting format is often the one that matters most.

Authority	Jurisdiction	Role	Note
ADNOC / Supreme Council for Financial and Economic Affairs	United Arab Emirates	Concession and approval	Operator-led approval regime.
Ministry of Energy and Minerals	Oman	Licensing and approvals	Works with PDO and other concession holders.
Ministry of Energy and Infrastructure	United Arab Emirates	Federal energy policy	Federal-level oversight.
Saudi Ministry of Energy	Saudi Arabia	Policy and concession	Aramco operates under exclusive concession.
Bureau of Safety and Environmental Enforcement	United States	Offshore safety regulator	30 CFR 250 governs OCS operations.
Bureau of Land Management	United States	Onshore federal land	Permits wells on federal acreage.
Railroad Commission of Texas	United States	State regulator	Permits, reporting and abandonment in Texas.
North Dakota Industrial Commission	United States	State regulator	Bakken permitting and reporting.
Environmental Protection Agency	United States	Injection wells	UIC programme, Class II and Class VI.
Alberta Energy Regulator	Canada	Provincial	Directive 008, 059 and the well licence regime.
BC Energy Regulator	Canada	Provincial	Montney and northeast British Columbia.
North Sea Transition Authority	United Kingdom	Licensing	Well notification and consent.
Health and Safety Executive	United Kingdom	Offshore safety	Well examination scheme and safety case.
Petroleum Safety Authority / Havtil	Norway	Offshore safety	Enforces the Norwegian regulatory framework and NORSOK.
Norwegian Offshore Directorate	Norway	Resource management	Licensing and reporting.
Danish Energy Agency	Denmark	Licensing and safety	Danish sector.
State Supervision of Mines	Netherlands	Licensing and safety	Dutch onshore and offshore.
NOPSEMA	Australia	Offshore safety and environment	Well operations management plans.
ANP	Brazil	Regulator	Licensing, reporting and local content.
CNH	Mexico	Hydrocarbons commission	Contract and field development approval.
DGH	India	Upstream regulator	Field development plan approval.
MEMR / SKK Migas	Indonesia	Regulator and PSC management	Approves work programmes and budgets.
PPPA / Ministry	Malaysia	Petroleum arrangement	Petronas holds the resource; PSC framework.
NUPRC	Nigeria	Upstream regulator	Licensing and reporting under the PIA.
EAD / MOCCAE	United Arab Emirates	Environmental permits	Environmental approval for wellsite operations.
MECA	Oman	Environmental permits	Environmental approval and waste manifesting.

WHO DRILLS, WHERE,AND WHO APPROVES IT.

Drilling contractors — Middle East and North Africa

Drilling contractors — offshore and international

Drilling contractors — Americas, Asia, Europe and Africa

National oil companies

International operators and independents

Major drilling basins and provinces

Regulators, authorities and licensing bodies

Drilling contractors — Middle East and North Africa

Drilling contractors — offshore and international

Drilling contractors — Americas, Asia, Europe and Africa

National oil companies

International operators and independents

Major drilling basins and provinces

Regulators, authorities and licensing bodies

WHO DRILLS, WHERE,
AND WHO APPROVES IT.