膨胀筛管的研制及现场试验

疏松砂岩防砂一直是油田开发中的难题。传统的防砂管都有其弱点，不仅容易发生井眼坍塌使筛管损坏，还增加了流体进入管内的流动阻力从而减少了产量；膨胀筛管技术具有大通径的特点，膨胀后可紧贴在井壁上，不仅增加了筛管的表面积，降低了筛网内外的压降从而提高了产量，而且也减少了砂粒运移和对筛管的冲蚀损坏。为了解决疏松岩防砂的难题，胜利油田研制出了膨胀筛管及膨胀螺纹、膨胀悬挂器、变径膨胀工具等附属工具。膨胀筛管采用内层为基管、中间层为多层滤砂网、外层为膨胀保护外套的3层结构设计，其中基管采用J55钢管及15CrMo钢管，膨胀保护外套、多层滤砂网均采用316L不锈钢材料。地面试验及井下模拟试验的结果表明，膨胀后筛管的抗挤毁性能、轴向抗拉性能、轴向抗压性能均满足现场使用要求。膨胀筛管在胜利油田GDN32-05井和GDD15-01井2口井的现场试验结果表明，膨胀后筛管内径比普通筛管内径大，有利于增大泄油面积，提高油井产量。 

Expansion Sand Screen Development and Field Test

Sand control in unconsolidated sandstone is always a key difficulty in developing oil and gas reservoir.The weaknesses in traditional sand screens can cause screen damage due to wellbore collapse,and reduce production rate by increased flow resistance.The expandable screen has the characteristic of larger drift diameter.The screen will contact wellbore closely after expansion,which increased production rate by increasing the screen surface area and reducing pressure drop between inside and outside of the sc...