| We often meet such problems unable to solve in perforating operation as cable transmission perforating, cast bar type transmission perforation , ordinary pressure transmission perforation,etc. If we make negative pressure perforating between high-deviated wells or horizontal section and multi-layer section ,it'll cause engineering accident sometimes in the cases handled improperly .Troubles such as blowout, environmental pollution and repeated operation will not only delay the progress of the projects ,but affect the try for the authenticity of the oil production . Multistage blasting technique on perforation pressurization in oil-gas wells satisfies these needs as above,especially in specific engineering and geological conditions .In the study, we analysis one key components of the principle of pressurization device ,that is to design the pressurization device by the means of finite element on the basis of learn adequately about the multistage blasting technique on perforation pressurization.In the process,we research relative theory knowledge of stress ,displacement and round pipe flow in fluid mechanics on the condition that thick wall cylinder's pressure is uniform and airtight in elastic mechanics with the help of fluid mechanics software . We can only get transverse stretching quantity through many numerical two-dimensional and three-dimensional numerical simulation analysis by using finite element analysis software because two-dimensional calculation is based on plane strain problem . Three-dimensional model is closer to the real tubing stress state ,so we get not only horizontal and longitudinal stretching quantity but the overall volume variation under the common action of underground pressurization .It can provide scientific guidance for the design of the pressurization device to analysis the relative influence factors of pressure loss in tubing, to calculate the tube's volume variation,liquid column compression including pressure transmission distance,tubing size,temperature and well densities. We can achieve the goals by quantitative analysis result of a series of numerical simulation work provided above instead of lots of trival field experiment .It can provide scientific basis for the design of pressurized device in the case of design cost savings. |
