Horizontal-well subdivision cutting and volume fracturing technology for the deep tight sandstone gas reservoirs in the Shengbei Block

To cope with poor early vertical well fracturing effect and difficult effective reserve production in the deep tight sandstone gas reservoirs of the Shengbei Block, Tuha Oilfield began to research the horizontal-well volume fracturing technology based on the reservoir geological characteristics of this block in 2019, focusing on improving the stimulated reservoir volume, ensuring the fracture conductivity and reducing fracturing construction risk. As a result, several key fracturing technologies are developed, including subdivision cutting, multi-stage and multi-cluster, large-scale volume fracturing, high-temperature mixed fracturing fluid system, high-temperature soluble bridge plug, combined small particle size proppant and construction proppant concentration control. By February 2021, these technologies had been practically implemented in 3 wells and realized breakthrough in single-well production rate. The maximum oil and gas equivalent of Well Shengbei 503H after fracturing is as high as 100 t/d. The field practice proves that this technology is well adaptive to the deep tight gas reservoirs in the Shengbei Block and lays the foundation for the effective production of the tight gas reservoirs in this block.