Oil has shaped Brunei Darussalam’s economy for nearly a century. Commercial production began at Seria in 1929, creating the foundation for government revenue, export earnings, infrastructure and a wider oil and gas services industry.
The country’s petroleum system differs sharply from that of a new producer. Brunei already has experienced operators, established offshore facilities, export infrastructure and a skilled domestic workforce. Its main challenge is preserving value as mature fields become more technically difficult and expensive to operate.
Brunei is responding through three connected strategies. It is attempting to improve recovery from existing fields, attract exploration into offshore acreage and develop a larger downstream refining and petrochemical sector. The goal is to earn more from each unit of hydrocarbon production while reducing dependence on unprocessed crude exports.
Seria Remains the Historic Center of Brunei’s Oil Industry
The discovery of the Seria field transformed Brunei from a small trading economy into one of Southeast Asia’s established petroleum producers. Production began onshore before expanding into shallow offshore waters, where much of the country’s present oil and gas infrastructure is located.
Seria and the surrounding Belait District remain closely associated with the industry. Brunei Shell Petroleum maintains its headquarters in the area, while workshops, laboratories, storage facilities, contractors and technical services support operations across western Brunei and offshore.
Brunei Shell Petroleum, commonly known as BSP, is the country’s largest upstream operator. It is a joint venture between the Government of Brunei and Shell. Its activities include exploration, field development and the production of oil and natural gas for domestic use and export.
The operating environment is extensive despite Brunei’s small geographical size. BSP manages approximately 220 offshore oil and gas structures, ranging from drilling and production platforms to wellhead facilities and supporting equipment.
Many of these assets belong to a mature petroleum system. Older reservoirs typically experience falling pressure, rising water production and declining output from existing wells. Offshore structures also require continuing inspection, maintenance and modification in a humid marine environment.
Maintaining production therefore depends less on discovering simple, low-cost fields and more on detailed reservoir management. Operators must use improved seismic data, infill wells, artificial lift, water injection and other enhanced recovery techniques to extract additional oil from known reservoirs.
Mature-field work can support production for many years, but it also creates a growing decommissioning obligation. Facilities that can no longer operate safely or economically must eventually be removed, wells must be secured and sites must be restored according to national regulations.
Offshore Exploration Is Intended to Renew the Resource Base
Improved recovery cannot maintain national production indefinitely. Brunei requires additional discoveries if it wants to replace depleted reserves and sustain a meaningful upstream industry over the long term.
The Petroleum Authority of Brunei Darussalam regulates petroleum operations and manages the country’s resource interests. Its responsibilities include oversight of operators, licensing, safety and the maximization of strategic value from national oil and gas resources.
Brunei launched an offshore licensing round in 2025 to attract companies into available exploration areas. The offer reflects a wider effort to renew international interest in the country’s offshore geology and bring new capital, technology and exploration experience into the market.
Brunei’s waters form part of the petroleum-rich geological system around northern Borneo. However, finding commercially attractive deposits is becoming more difficult as the most accessible structures have already been explored or developed. New prospects may involve deeper reservoirs, more complicated geology or higher drilling costs.
Investment decisions are also influenced by the size of potential discoveries. Global operators compare Brunei’s acreage with opportunities in larger and newer producing regions. Competitive fiscal terms, reliable regulation, access to infrastructure and efficient approval processes therefore matter when companies decide where to direct exploration budgets.
Brunei offers several advantages. It has long experience with international partnerships, established export systems and a stable institutional environment. Existing platforms and pipelines may also make smaller discoveries commercially useful when they can be connected to nearby infrastructure.
The main risk is that exploration does not replace production quickly enough. A prolonged decline would reduce crude export earnings and could leave parts of the offshore network underused.
Pulau Muara Besar Has Changed the Downstream Oil Economy
Brunei historically exported much of its petroleum in the form of crude oil and liquefied natural gas. The development of the Pulau Muara Besar refinery and petrochemical complex has created a second route for generating value.
Hengyi Industries began operating the first phase of the complex in 2019. The facility can process approximately eight million tonnes of crude oil per year and produces fuels and petrochemical products for domestic and international markets.
The project represents more than additional refining capacity. It connects Brunei to regional manufacturing and trade networks through the production of gasoline, diesel, aviation fuel, petrochemical feedstocks and aromatic products. This allows economic activity to continue after crude oil enters the refinery rather than ending when it is loaded onto an export tanker.
The complex also changes Brunei’s trade profile. Some crude feedstock may be imported for refining, while finished fuels and petrochemicals are exported. As a result, growth in downstream petroleum manufacturing does not always move in the same direction as domestic crude production.
Hengyi plans a major expansion of the Pulau Muara Besar complex. The current program is scheduled to raise annual production capacity from eight million tonnes to approximately 20 million tonnes by early 2029. This would make downstream manufacturing an even larger part of Brunei’s industrial economy.
Expansion requires significant port, storage, utility and logistics infrastructure. It also increases demand for operators, maintenance specialists, engineers, laboratory workers and other technical roles. Training Bruneian workers for these positions is an important part of the project’s national economic value.
The refinery therefore provides Brunei with a form of diversification that remains connected to its petroleum expertise. It does not remove dependence on hydrocarbons, but it moves the country into more complex and potentially higher-value stages of the oil supply chain.
Petroleum Still Supports Growth, Exports and Employment
Oil and gas continue to influence nearly every part of Brunei’s economy. Hydrocarbon activity supports public finances, export income, construction, marine services, technical employment and demand for local suppliers.
The importance of the sector can also make national economic growth uneven. Maintenance shutdowns, field disruptions, weaker production or lower prices can reduce output and export revenue within a single quarter. Restored operations can then produce a noticeable economic recovery.
Brunei’s economy grew by 0.7% in 2025, with the oil and gas sector expanding by 3.1%. Higher activity in petroleum extraction and LNG manufacturing helped offset weaker performance in parts of the non-oil economy.
The industry also functions as a platform for local business development. Government policy and operator procurement programs encourage the use of Bruneian workers, contractors and suppliers. Oil and gas employment includes engineering and production roles as well as transport, catering, fabrication, inspection, environmental services and equipment maintenance.
Local participation does not automatically create a fully diversified economy. Many suppliers remain dependent on spending by BSP, the government or a small number of large industrial projects. A sustained production decline could therefore affect businesses well beyond the upstream sector.
Brunei’s broader development strategy seeks growth in manufacturing, logistics, tourism, food production, digital services and other industries. Petroleum revenue and infrastructure can support this transition, but downstream oil and petrochemicals remain among the country’s most developed options for large-scale industrial expansion.
Brunei’s Oil Future Depends on Extracting More Value, Not Only More Crude
Brunei is unlikely to reproduce the rapid production growth associated with a newly discovered petroleum province. Its more realistic strategy is to manage mature resources carefully while increasing the economic value created around them.
Additional offshore discoveries would strengthen this approach, especially if new fields can use existing platforms, pipelines and processing facilities. Mature-field investment can slow decline, while clear decommissioning rules can manage the cost and environmental effects of retiring older assets.
The downstream sector offers the largest structural change. Expansion at Pulau Muara Besar could make refining and petrochemicals more important even when domestic crude production is under pressure. It could also create a wider base of industrial skills and supporting services.
This strategy still carries exposure to global oil prices, refining margins and regional competition. Large Asian refining systems can operate at considerable scale, and Brunei must remain efficient to compete.
Brunei’s petroleum industry has already lasted far longer than its early developers could have expected. Its next phase will depend on extending mature fields, securing selective offshore discoveries and completing downstream investments that turn petroleum resources and imported feedstock into higher-value products.