AminahBukenya, the spokeswoman for the firm’s Ugandan unit, told Reuters that CNOOC would participate in the EACOP project.
Bukenya said the level of firm’s equity stake would be determined by the joint venture partners.
Uganda discovered crude oil reserves about 13 years ago, but commercial production has been delayed partly because of a lack of infrastructure such as an export pipeline.
The 1,445 km (900 mile) East African Crude Oil Pipeline (EACOP), costing $3.5 billion, will pass through neighbouring Tanzania to the Indian Ocean port of Tanga.
CNOOC jointly owns Uganda’s oil fields with France’s Total and Britains’sTullow.Total has previously said it was interested in financing the pipeline.Tanzania and Uganda are both expected to take stakes.
About two thirds of the pipeline’s cost will be financed by debt and a Ugandan unit of South Africa’s Standard Bank Group and Japan’s Sumitomo Mitsui Banking Corp are jointly helping to raise the credit.
Ugandan officials have said the government is now aiming to have commercial crude production start in 2022.
Government geologists estimate the country’s reserves, in the Albertine rift basin near the border with Democratic Republic of Congo, at six billion barrels.
Bukenya said CNOOC also planned to produce gas and use some of it to generate up to 42 megawatts of electricity for the company’s use and for sale to the national grid.
Energy Minister, Irene Muloni, said in December that Uganda’s oil fields had associated natural gas reserves estimated at 500 billion cubic feet.