形状记忆合金在油井封隔器中的应用研究

传统自封型封隔器采用橡胶皮碗作为密封材料,耐高温性能差,使用寿命短。利用形状记忆合金的记忆性能,将形状记忆合金设计成封隔器中的密封部件——密封圈,封隔器在低温状态下到油井指定位置,当温度升高达到合金的Af点后,密封圈可自动恢复原来的形状和尺寸,其膨胀产生的应力使密封圈与油井井壁紧密接触,起到密封作用。利用形状记忆合金对温度变化的响应,可以简化产品结构,降低密封和解封的施工难度,满足高温生产环境的要求,提高产品的使用寿命。

Application of Shape Memory Alloy in Packer

In general, self-sealing packer using rubber as sealing material cannot work in high tem- perature, and its service life-span is short. To take advantage of the properties of shape memory alloy, it is possible to use shape memory alloy as sealing part（ sealing ring） of packer, and put packer into the predetermined site when the temperature is low. The sealing ring resumes automatically when the temperature rises to the point of Af, and the stress produced in expansion causes the sealing ring reach the wall of oil well, so that it can seal the oil well. Making use of the response of shape memory alloy when temperature changes, we can simplify the structure of products, reduce the difficulty of sealing or releasing, meet the need of high temperature, and raise the service life-span of products.