Water flooding tech bolsters Bozhong 28-2 output
Thursday, Aug 10, 2017
CNOOC’s Bozhong 28-2 South oil deposit had yielded more than 10 million cubic metres (62.9 million barrels) of crude by the end of July as the result of water flooding technology implemented by the NOC to bolster output.

Bozhong 82-2 is part of the Bozhong 28/34 oil cluster in the Bohai Sea, which comprises four deposits that were producing around 39,000 bpd of oil as of 2011.

CNOOC owns the cluster outright with 100% interest.

Last week, the NOC said it had conducted research at Bozhong 28-2 South in 2014 to analyse fluctuating sand flows that had complicated oil extraction, and to develop water injection to stabilise yields.

Geological difficulties had disrupted output at Bozhong 28-2 previously; in 2011, CNOOC was forced to halt extraction because of a fault on the mooring system of the Haiyangshiyou 102 FPSO.

Bozhong 28-2 South is now said to have encountered greater water discharge from its reservoirs, which suggests output from the deposit is bound to diminish.

As a result of EOR techniques, however, CNOOC said it had managed to lessen the anticipated decline by around 2 percentage points.

Bozhong’s location in the Bohai Sea makes it a crucial source for oil demand in the populous Bohai Sea Economic Region, which includes several areas surrounding Beijing such as Tianjin and Hebei provinces. For decades, exploration regions such as Bohai had allowed China to satisfy fuel consumption without requiring imports, but the country’s soaring thirst for crude has since made this impossible.

Chinese demand for oil and gas climbed by around 4.4 times and 12.75 times respectively between 1990 and 2014, leaving NOCs to source 65% of the country’s crude consumption from overseas in 2016.

Meanwhile, the industry crash in 2014 left NOCs counting the cost of ageing Chinese deposits, leading to several well closures.

The Bohai Sea region nevertheless remains an important hub for NOCs to meet local demand and stop the export share of consumption rising further. CNOOC has continued to launch new deposits in the region, such as the Jinzhou 9-3 oilfield, which added around 7,600 bpd of output when it launched in February 2016.

Others have worked to maximise drilling efficiency in light of low oil prices. In June, for instance, CNPC announced new well plates had saved costs of 400,000 yuan (US$58,824) at the Dagang Banqiao test probe.

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