The Study On Integral Technology Of Double Layer Fracturing Without Pulling String And Unloading Liquid

The integral technology of single layer fracturing and unloading liquid can fulfill singlelayer fracturing without pulling string and acquire out flowing production, but this cannotachieve separate layer fracturing with primary string and acquire out flowing productiondirectly. At present, the most objectives of DaQing oilfield exploration is low permeable oillayer, its features contain miner thickness of single layer, more layers, and demands separatelayer fracturing, but the technology of separate layer fracturing integrating these conditionsdemands rising string, running fracturing, pulling out fracturing string, and running the stringof out flowing production after fracturing. So, there are some problems, unloading liquid isnot on time, the retention time is long when fracturing fluid exists layer, pollute layer, themetering of blow out is inaccuracy, operation intension is great, working environment isodious, and can not catch up the requirement of HSE operational criterion. In view ofabove-mentioned problems, given the theme "the study on integral technology of double layerfracturing without pulling string and unloading liquid", and prove this technologicalfeasibility and reliability through the tests of simulator well and field. During the process offield construction, also verifies this technological feasibility. The development tools and stringconfiguration not only can meet the construction of double layer fracturing without pullingstring, but also solve the problem of selective layer fracturing well, and also solve sanding invalidly during fracturing.