The Xinchang Gas Field is a HPHT deep well. It was a dense reservoir of low porosity and super-low permeability, with no natural flow potential. To prove the gas reserves and to understand the reservoir, it had to be fractured. Its reservoir property was poor, the pore throat is slim, therefore flowing back was quite difficult and reservoir was easily damaged by fluids; it was also deep-burial, and the fracture pressure gradient was abnormally high and the operating pressure was high at wellhead. Petro-king implemented large fracturing to solve the problems of high operation pressure, difficult gravel input, and difficult return of fracturing fluid inside the hole. Petro-king pumped in a gravel of 100m3 in single layer, and got daily gas production of 130,000m3 after fracturing, thus making a technical breakthrough of fracturing in the Xujiahe’s Formation in the western Sichuan.