ADNOC has announced it is moving ahead with plans to expand the capture, storage and utilisation of CO2, produced from either the Habshan-Bab gas processing facilities or the Shah gas plant. A decision on which plant to capture the CO2 from first will be taken in 2019. The project will be engineered so as not to interrupt ongoing production from either facility.
The additional CO2 capture will reduce ADNOC’s carbon footprint and liberate natural gas, previously used for oil field injection, for other more valuable purposes, while simultaneously addressing growing global demand for oil by boosting recovery from its maturing reservoirs.
The Shah plant – built and operated by a joint venture between ADNOC and Occidental Petroleum Corporation – is one of the world’s largest facilities processing ultra-sour gas. It processes about 1.3 billion standard cubic feet per day (scfd) of sour gas and associated condensates, which contain over 20 percent hydrogen sulphide and 10 percent CO2. By 2025, modifications to the facility would enable the gases to be captured as part of the sulphur recovery process and converted into pure CO2 for enhanced oil recovery (EOR). Using advanced CCUS technology, more than 2.3 million tons per annum (120 million scfd) of CO2 are planned to be captured and safely locked away underground.
Meanwhile, the Habshan and Bab complex could capture another 1.9 million tons per year of CO2 (100 million scfd). The complex can process up to 6.2 billion scfd of associated gas, making it the largest in the UAE and one of the biggest in the Gulf.
ADNOC has drawn up an ambitious plan to capture CO2 from its own operations, using more cost-effective second- and third-generation carbon capture technologies to meet a six-fold increase in the utilisation of CO2, for EOR. ADNOC plans to capture about 5 million tons of CO2 per year (250 million scfd) before 2030.
Currently, ADNOC has the capacity at Al Reyadah to capture 800,000 tonnes of CO2 annually from Emirates Steel Industries (ESI). The CO2 is compressed and dehydrated before being transported through pipelines for injection into reservoirs at the Rumaitha and Bab oilfields to boost oil recovery.
In the oil industry, CCUS technology works in three stages. Carbon dioxide is first captured on site, then it is compressed and dehydrated. Finally, it is transported by pipeline for injection into oilfields, where it can be used to enhance oil recovery. Using primary and secondary (waterflood) recovery techniques, between 30-35 percent of oil is recovered on average. At ADNOC, the use of CO2, to help maintain reservoir pressure could increase end-of-life recovery to up to 70 percent.
For more information visit www.adnoc.ae
3rd December 2018