** Hong Kong shares of CNOOC SSE:600938 climb 2% to HK$18.64, highest since April 3
** Stock set for biggest one-day pct rise since May 12
** Shanghai-listed stock SSE:600938 adds 0.9% to 26.43 yuan, highest since April 2
** Sino Geophysical SZSE:300191 says the co and CNOOC jointly-cooperated Weizhou 5-3 Oilfield Development Project has commenced production on June 6
** CNOOC says project expected to achieve a plateau production of about 10,000 barrels of oil equivalent per day in 2026
** Says CNOOC holds 51% interest in the project and Sino Geophysical's unit Smart Oil Investment owns 49%
** Sino Geophysical stock jumps 16.8% to 20.76 yuan, highest since March 24
** In China, blue-chip CSI 300 Index SZSE:399300 and Shanghai Composite Index SSE:000001 both climb 0.3%
** In Hong Kong, Hang Seng Mainland Oil & Gas Index (.HSMOGI) slips 0.1%, Hang Seng Index HSI:HSI rises 1.3%
** YTD, CNOOC Hong Kong stock down 2.6%, Shanghai shares down 10.6%