72 hours transit visa on the way to Singapore from hongkong

I'm an Australian passport holder traveling Southkorea at the moment. I came to Korea directly from Melbourne 2weeks ago, and going to Hongkong next month and then hongkong to singapore, and finally going back to Australia. My flight ticket from hongkong to singapore stops over at Chengdu.
Is it possible to travel Chengdu for 3days without china L type? I'm thinking about changing the flight date from Chengdu to Singapore if this 3days transit is possible.