Application of coiled tubing jet perforation separated fracturing through annulus technique in Sulige gas field

Sulige gas field belongs to three low-fields, including low porosity, low pressure and low permeability, and requires fracturing treatment for industrial gas. Depending on its technical advantages, coiled tubing jet perforating staged fracturing through annulus technique becomes the most significant method for horizontal wells stimulation in Sulige area. Through the combination of down-hole tools such as positioned and packer, coiled tubing jet perforation separated fracturing through annulus technique can realize sand blasting perforation, packer stratification, downloading casing in large quantities and coiled tubing accurate positioning. So several works can be finished by only one string trip, and has the advantages of short working cycle, low cost, full size after fracturing, etc. This paper elaborates the operating principle of this technique and the mechanism and structure of main tools in detail. The successful implement of this new process in one horizontal well in Sulige illustrate that the coiled tubing jet perforation separated fracturing through annulus technique is applicable to tight gas reservoirs, providing a new and effective mean for multi-stage hydraulic fracturing of horizontal wells.