The Contact Pressure Analysis And Structure Optimization Of The Compressed Packer

Most oil fields in our country are multilayer heterogeneous reservoirs. In the process of oil field exploration, the pressure, output and water absorption of each reservoir has great difference. Packer is one of the essential down-hole tools in the process of oil production by layer, the research of its Sealing mechanism, optimize the structure can effectively solve the problem of slice mining of high temperature and high pressure reservoir, which can enhance the technical level of oil in the field of high temperature and high pressure seal, it is of great significance for the development of the deep reservoir.The key component of packer is the hyper-elastic rubber tube. Its mechanical properties are complicated. The material parameters of Mooney-Rivlin and Yeoh model can be obtained through curve fitting with the uniaxial tensile test on the rubber with filler, and the strain energy function of the rubber with the filler can be determined combining the experimental data. This paper analyses the effect of the sealing property of packer under different geometric parameters of packer rubber(Including camber angle, height, rubber tube thickness), set-down loads, loaded mode and annular clearance by using ANSYS software, and designs outburst prevention device in the rubber tube end, analyses the effect on the sealing property of the packer under different structure parameters and material of the outburst prevention device. Finally, this paper develops the visual interface by using the Visual Basic language, and encapsulates the ANSYS software for engineering analysis in order to improve the work efficiency.The result shows that, when the camber angle of the rubber tube is 45?, the height of the upper and lower rubber tube is 60 mm, the height of the middle rubber tube is 50 mm and the thickness of the rubber tube is 21 mm, the sealing property of the packer is better. With the increase of set-down loads, the contact pressure between rubber tube and casing is increasing; the upper and lower rubber tube are fully compressed under biaxial load, which makes up the defect that the rubber tube away from the loading end is not fully used under uniaxial load; the maximum contact pressure of the rubber tube tends to increase and then decrease with the increase of annular clearance, and reaches the maximum when the annular clearance is 3 mm. The outburst prevention effect is better when brass chamfer cling to the rubber tube and the thickness of the brass is 1 mm; and the outburst prevention effect is better when the Teflon thickness is 4 mm. By the comparison of the rubber deformation and the change of the contact pressure among packer without outburst prevention device, packer with brass outburst prevention device and packer with Teflon outburst prevention device, we obtain that when the Teflon thickness is 4 mm, the rubber tube has small shoulder prominent and the longest contact length and the largest maximum contact pressure between the rubber tube and casing. Therefore, the packer with Teflon outburst prevention device is the best.