China surprises oil markets again with a return to stockpiling in July: Russell
XLE•How the July surplus was calculated
China does not disclose the volumes of crude flowing into or out of its strategic and commercial stockpiles, but an estimate can be made by deducting the amount of oil processed from the total crude available from imports and domestic output.
On this basis, crude oil imports of 8.41 million bpd and domestic output of 4.3 million bpd mean refiners had a total of 12.72 million bpd available.
China's refiners processed 12.51 million bpd in July, according to official data released on Monday, down 15.8% from the same month last year and only marginally above the from June. Subtracting the July throughput from the total crude available leaves a surplus of about available for storage.




