Application of Fracturing and Completion Technology in Sichuan-Chongqing Continental Tight Sandstone Reservoir

Tight sandstone gas reservoir is a very important unconventional oil and gas resource, but its reservoir physical property is poor, permeability is low, and exploitation is difficult. The existing fracturing and completion process can no longer meet the on-site technical requirements. According to the reservoir characteristics of Xujiahe Formation and Shaximiao Formation in Hechuan Gas Field, vertical well high-pressure and large-displacement multi-layer fracturing string and vertical well high-pressure and large-displacement multi-layer fracturing gas lift string are designed. The critical tool is Y344 self-releasing pressure-guided sandblasting packer, which integrates abrasion resistant, sealing and self-releasing functions. Large-scale fracturing construction was carried out on the site, and the results show that the two fracturing completion processes and reservoirs are highly compatible, it can not only meet the requirements of “large displacement”, but also ensure the safety and reliability of the pipe string. To provide technical support for the development of Shaximiao and Xujiahe reservoirs in Sichuan and Chongqing areas.