Changqing sandstone tight gas is characteristic of low-permeability and low-pressure, which is difficult to obtain economic benefits without fracturing. A new multistage fracturing technology for horizontal gas well is used in tight sandstone gas reservoirs. The new technology is hydro jetting-based and control the nozzles by opening the sliding sleeve by ball setting. With no need of packers and slugs, the technology realizes the integration of perforating, fracturing and isolation, achieving fracturing multiple stages in a single trip.
Field trials of 64 wells show that the new technology is simple and reliable, which is capable of meeting the requirements of rapid isolation and multi-fracturing in gas wells. The new technology opens another door for multistage fracturing horizontal well of sandstone tight gas and make the reservoirs have economic development potential.