Simulation Of Oil Packer

While the petroleum drilling technology develops towards to deep-well with high-temperature and high-pressure, the work environments for the oil extraction devices has been becoming much more severe. The packer, as a key part used during the oil extraction, is expected to have higher qualities.The rubber-like materials making the packer tubes have special mechanical properties, and the studies on the constitutive model have been caught much emphasis in both engineering and academia. Since the elasticity of rubber is from the change of energy, the compression tests on the cylinder material are firstly performed and then the stress-strain curves of the super-elasticity and pseudo elasto-plasticity materials are obtained respectively. The Arruda-Boyce model with the strain energy function is adopted successfully to fit the constitutive relationship of super-elastic materials and then the material parameters are calculated. Thus the constitutive equations of the rubbers in the form of Arruda-Boyce strain energy function are constructed.The single tube model is simulated. As the friction coefficient increases, the contact pressure between the super-elastic tube and the casing pipe become smaller, and the pressure along the loading direction will decrease greatly. For the pseudo elasto-plasticity tube, the influence of the friction coefficient on the pressure is on the contrary. The greater the friction coefficient, the greater the contact stress. Under the same conditions, the pressure between the super-elasticity tube and the casing pipe is smaller than that of the pseudo elasto-plasticity tube, and the former can bear the greater load pressure.The packer Y241-100is simulated and the results shown that the pseudo elasto-plasticity tube has the stronger sealing capacity than that of the super-elasticity tube. As the initial elastic modulus increases, that is the material become harder, the contact stress on the loading tube increase, and the distributions of contact stress on the other tubes tend to uniform. On the base of the above simulations, a simplified calculation model of the packer is proposed to increase the efficiency for the analysis of the oil extraction system.