Visa-free in Beijing

Good morning,

I´m doing the following trip:

First leg:
•Spain – Russia (few hours transit at the airport) - Beijing 3rd August
•Beijing – Australia 6th August

Second leg:
•Australia – Beijing 15th August
•Beijing – Russia (few hours transit at the airport) - Spain 19th August

I´ll stay 3 days on the first leg and 4 days on the second leg in Beijing.
Can I use 2 times the 144 h free transit?
Is there any issue by doing Spain-Russia-Beijing-Australia?

Thanks for the help..