144 hour TWOV in Beijing

we are arriving in Bejing on flight EK306 on 2 October and staying in hotel for 3 days before going by train to Xian to visit Terracotta Warriors. We then embark on Mariner of the seas in Shanghai on 7 October and sail to Xiamen arriving on 9 October. Is this itinerary acceptable for a 144 hour transit without visa for our visit to China