遇油膨胀封隔器的封隔性能研究

Study on the Sealing Property of Swellpaker

基于封隔器的密封性判据和结构设计方法,在对遇油膨胀封隔器的吸油膨胀进行热膨胀描述的基础上,通过ANSYS有限元计算遇油膨胀封隔器在井下的接触压力,建立封隔器封隔性能分别与胶筒长度、厚度关系的计算模型。结果表明,遇油膨胀橡胶的热膨胀与吸油膨胀相一致,通过膨胀橡胶的热膨胀分析可以合理描述出膨胀橡胶吸油膨胀后的状态。有限元分析表明,随着胶筒长度和过盈厚度的增大,封隔器的封隔性能都呈指数规律增大。

According to the sealing property judgement and the structure design method of packer, based on the thermal expansion description of oil absorption expanding of swellpaker, the contact pressure of swellpaker was analyzed by FEM, and the mathematic models of the sealing property of packer with the length of rubber and the magnitude of interference of rubber were founded separately. The results show that the thermal expansion of swelhng rubber is consistent with oil ab- sorption expanding, and the thermal expansion analysis can simulate the oil absorption expanding progress of swelling rub- ber reasonably. The FEM analysis suggests that the sealing property of packer increases exponentially with the length and magnitude of interference of rubber.