形状记忆筛管膨胀性能测试

为了解形状记忆筛管在井下环境的膨胀性能，根据该筛管在井下的膨胀原理，研发了能够模拟井下环境的形状记忆筛管膨胀性能测试系统，进行了形状记忆筛管样机膨胀性能测试，分析了循环流体排量和温度对响应温度、膨胀速度和膨胀力的影响。研究结果表明:随着循环流体排量增大，响应温度随之升高，膨胀速度降低；当循环流体温度不低于初始响应温度时，随着循环流体温度升高，膨胀速度增大；循环流体的排量和温度对最终膨胀力的影响较小。测试结果为形状记忆筛管的设计和应用提供了依据。 

Test of the Expansion Performance for Shape Memory Screens

In order to understand the expansion performance of shape memory screens in the downhole environments, a system for testing screen expansion performance was developed by simulating downhole environments based on its expansion principle, by which the expansion performance of the shape memory screen prototype was tested and analyzed the influences of the circulating fluid flowrate and temperature on the response temperature, expansion rate and expansion force. The results showed that the response temperature increased and the expansion speed decreased with the increase of circulating fluid flowrate. When the circulating fluid temperature was not lower than the initial response temperature, the expansion rate increased as the circulating fluid temperature rose, which showed that the influences of circulating fluid flowrate and temperature on the final expansion force were relatively minor. The test results can provide a test basis for designing a shape memory screen and its application in well completion.