Design Of The Packer With The Large Expansion And Research On The Mechanical Model

This topic was commissioned by an oil company in Xi’an, according to thedemand of domestic oil fields; was designed and researched the large expansionpacker. To increase the amount of expansion of the packer and to seal oil wellcasting to achieve the purpose of the paper. Firstly, was combined with themodern design and CAE technologies to design the whole packer, then,mechanics calculation were carried on steel strip and rubber of the compositestructure and different regions of the rubber. At last，was conducted the Staticanalysis of steel strip and the composite structure.With the continuous development of the oil field, China’s high-yield oilfields become less, and the environmental conditions become worse. In the oilextraction process, some engineering and technical factors, or the destruction ofthe geological environment and other reasons can cause damage to the oil wellcasing. Thus, the casting must be repaired. But this will result in the diameter ofthe casting become smaller, and the traditional packer is not suitable for thisdeformation of the use of wells. The thesis studied the large expansion of theamount of the packer to develop oil field rationally and improve oil extractionefficiently. For small diameter packer, domestic research focuses on thedevelopment of new materials in the cones, the thesis put forward a new sealingdevice to improve the structure of the cones through using a combination of stripand rubber compound structural expansion of the body, and designed the overallstructure of the packer. According to applying three-dimensional solid modelingand finite element analysis techniques, conducted physical modeling andnumerical simulation to the packer. Because the composite structure includedbelts and rubber, so they were calculated independently. Calculated the stress ofthe strip, established the relationship of the strip size and radial pressure, andoptimized the structure and size of the strip. The strip will be bended easier andthe axial pressure will be greater. The supporting part and the vacant part of therubber were calculated and established a relationship between the stress of strip and the pressure of contact strip rubber and casing respectively. These willprovide some reference to the large expansion of the amount of packer in thefuture.According to the demand of the large expansion of the amount of the packer,it determined the overall design of a large expansion of the amount of packer,including the overall structure design and the composite structures design.Calculated through the different areas of the cones, composite structure isfeasible. The thesis used Pro/E software to establish a three-dimensional modelof the packer and used ANSYS software to conduct static’s analysis. By thetheory of finite element method, the key part of the large expansion packer andcomposite structure were researched and analyzed.The finite element analysis technique was used, in the design of the packer.Researched the strip and composite structures by using ANSYS software,analyzed the maximum deformation of the strip and composite structures andtheir stress distribution which providing a certain reference value to Packersealing part of the expansion. The study has a great significance to shorten thedevelopment cycle and reduce R&D costs of the packer, at the same time; italso provides advanced technical support for the design of the packer.