Abstract
The compression packer rubber is one of the core components of the packer. According to the sealing mechanism of the compression packers rubber, the deformation of rubber between the central tube and casing tube is analyzed in the initial and working stages. The compression rubber is also strained radially against the support ring by means of a controlled tubular expansion process. In this paper, the theoretical model for the deformation analysis is established by the structure and working characteristics of rubber tube. In addition, the nonlinear relationship between the material, geometry and stress in the constrained and stable deformation stages is analyzed by application of pressure methods. The analytical results show the contact pressure and shear stress distribution on the sealing surface of the rubber and the effect of rubber geometry and its material properties on sealing performance in terms of maximum sealing pressure. Then, the criterion of sealing performance evaluation of the rubber is established by the numerical results. This analytical model will provide a theoretical basis and guidance for the structural design of the compression packer rubber and it will be of great significance to improve the sealing performance and reliability of packer rubber.
Highlights
Compression packer is a kind of down-hole tools, which are widely used in oil and gas resources exploitation
During down-hole operation, elastic rubber is compressed under axial load and generated radial expansion, which will seal the annular space between the central pipe and the casing tube
The results show that the friction coefficient between the rubber and the tube is greater for the contact pressure different, and reduced the frictional coefficient of the rubber can improve the contact pressure, which helps protect the rubber under the highly working pressure conditions
Summary
Compression packer is a kind of down-hole tools, which are widely used in oil and gas resources exploitation. The analytical results show the effect of elastomer geometry and its material properties on sealing performance under the sealing pressure Some studies on this subject [8,9] show the mechanical and characterization of a swelling rubber under the different compression or tension pressure, by a mechanical testing equipment. Due to the special material property of the rubber tube and large deformation, the sealing performance of the rubber tube, under high pressure, is affected by the structure and material, and the deformation of the sealing surface, such as the variation of the stress, the nonlinear flow and failure of the material [10] For this purpose, we estimate the traditional analysis method to reproduce some of the existing results in the literature, but some of methods were difficult to apply in engineering. It can be applied effectively and conveniently in oil well engineering practices [11,12]
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