Multistage hydraulic fracturing's tailpipe with additional elements for the possibility of re-fracturing operations in horizontal wells

Summary There are no optimal solutions for re-fracturing in horizontal wells in JSC «Gazpromneft-Noyabrsneftegaz» this time because exist certain factors that complicate process repeated hydraulic fracturing. The authors proposed the idea of creating multistage hydraulic fracturing's tailpipe with additional elements on new horizontal wells. This configuration has next additional element: movable elements with a saddle, soluble balls, hydraulic fracturing sleeves, packer. The idea is to close existing sleeves and open new ones without additional impact on the formation and attracting expensive equipment. Advantages of such simple type of tailpipe: 1. There is no need to prepare the well for repeated multi-stage hydraulic fracturing. 2. Minimization of manipulations for drilling ports in a horizontal wellbore prior to hydraulic fracturing. 3. It eliminates the need to run additional two-packer systems to separate each interval during re-fracturing. 4. It solves the issue of targeted repeated hydraulic fracturing in the selected zones. 5. It can be used not only for re-fracturing purposes, but also for isolating water-cut intervals according to the research results. 6. Reducing the cost of the re-fracturing process due to the elimination of the lease of attracting a contractor with two-packer assemblies, lengthy workover well preparation to achieve equal bore diameter in the horizontal part of the well.