在深海或其它海底完井后,封闭在水泥顶部和井口以下环空中的流体(隔离液或钻井液)被产出的热流体加热,从而发生膨胀,可产生非常高的压力,导致套管和油管柱破裂。采用真空隔热油管、氮基泡沫隔离液和尿烷泡沫等方法在一定程度上能防止封闭在环空中的流体受热膨胀,但是受到成本高 After deep sea or other seafloor completion, the fluid (barrier fluid or drilling fluid) enclosed in the annulus below the cement head and wellhead is heated by the produced hot fluid to expand and create very high pressures that can cause the casing and Tubing cracked. The use of vacuum insulated tubing, nitrogen-based foam insulation and urethane foam and other methods to a certain extent prevent the closed fluid in the annulus thermal expansion, but by the high cost