The huge gas leak in the North Sea that has now shut down three platforms could take six months to seal.
Gas has been leaking from one of the platforms - owned by Total - since Sunday.
More top news
Mr Lai is an outspoken pro-democracy figure in Hong Kong.
Opposition supporters suspect election officials will manipulate the results of the vote in favour of incumbent president Alexander Lukashen
Emergency services were alerted about 6.45pm.