Abstract: The tight sandstone in Zhongjiang Gas Field in Western Sichuan has uneven distribution of channel sand bodies, large horizontal stress difference, low brittleness index, undeveloped natural fractures, and high extensional pressure gradient. The characteristics result in the low sand adding intensity of the transformation, high construction pressure, which makes the output after compaction is not ideal. This paper draws on the concept of "the shortest flow distance, the smallest flow resistance, and the largest control range", relying on the integration of geology and engineering, with multi-vector strong support volume stimulation as the key makes a study on the volume stimulation technology of tight sandstone in Western Sichuan. Based on the balanced expansion of fine seam technology, the segmented clustering of tight sandstone double sweet spots in Western Sichuan is optimized, and the lateral production rate is greatly increased. With two-stage composite support, high-displacement continuous sand adding and real-time control of variable viscosity liquid, the high sanding strength technology realizes multi-vector forced sand with multi-fracture coupled proppant combination. The double compound temporary plugging and forced diversion of multi-particle size temporary plugging balls between clusters and multiple combined temporary plugging agents in fractures improves the complexity of transverse fractures. The research results have been successfully applied and gradually promoted in the Zhongjiang Gas Field. The research results have increased the sanding intensity from 0.50 t/m to 4.18 t/m in the early stage, increased by 8 times. The average unblocked flow rate has been implemented at 557 000 cubic meters per day. EUR is 133 million cubic meters, and the transformation effect is significantly improved compared with the previous period.

Key words: Zhongjiang Gas Field, balanced expansion, high sanding strength, double compound temporary, plugging modified volume