Application of new TAP multi-level hierarchical fracturing completion technique in low-permeability gas reservoir

There are some limitations in the existing fracturing technology for effective development of thin layered gas reservoir segment in Sulige gas field. So Changqing Oilfield Company carries out cooperation with Schlumberger to launch China’s first TAP completion hierarchical fracturing test in Tao X well. The technology is not to follow the conventional ideal of multi-fracturing that successively traps in layered tools, but to firstly trip in TAP body and casing for different payzones to cement wells, and then to complete multi-fracturing by injecting with casing. The biggest advantage is that the reservoir could be explored vertically as much as possible, at the same time, the cost for multi-perforation could be reduced, and therefore the whole well perforation cost could be reduced effectively. In 2009, the technology was implemented successively in Changqing Oilfield and good results were obtained, providing some technological reference for the exploitation of domestic gas fields with low pressure and low yield as well as multiple series of strata.