温敏型形状记忆聚合物及其在雄安新区热储钻进的应用展望

Temperature sensitive shape memory polymer and its application expectations during geothermal resevoir drilling in Xiong’an New Area

雄安新区地热资源丰富,其深部蓟县系雾迷山组碳酸盐岩热储是目前首要的目标储层。其碳酸盐岩热储高度发育地裂隙网使得钻井中存在钻井液严重漏失与储层伤害问题,导致地热井产能下降。为在实现地热钻井裂隙封堵的同时不伤害热储层,从而最大程度地提高地热井产能,本文提出应用温敏型形状记忆聚合物对温度响应的形状记忆特性以实现雄安新区裂隙型碳酸盐岩热储钻进过程中屏蔽暂堵。温敏型形状记忆聚合物既能够有效地应对雄安新区目标热储由于裂隙发育而造成的钻井液漏失问题,在地热井生产时又能够完全离开储层裂隙从而最大程度实现热储保护,是一种具有发展潜力的裂隙型热储屏蔽暂堵技术,为雄安新区高效地热钻井及热储保护技术提供一种新的技术手段。

There are abundant geothermal resources underlying in Xiong’an New Area,and the Wumishan carbonate geothermal reservoir of Jixian System has been the prior target geothermal reservoir so far.Highly developed fracture network of Wumishan carbonate geothermal reservoir in Xiong’an New Area leads to severe lost circulation of drilling fluid during geothermal drilling,and thus geothermal reservoir damage,which causes the decline of geothermal well productivity.In order to achieve the shielding of fractures during geothermal drilling in conjunction with reservoir protection,which aims at maximum productivity improvement,it is proposed that the application of shape memory polymer with shape memory effect sensitive to temperature could be feasible for temporary shielding during drilling in Wumishan fractured carbonate geothermal reservoir in Xiong’an New Area.Temperature sensitive shape memory polymer is capable of effectively dealing with the lost circulation problem induced by highly fractured target geothermal reservoir,while guarantees the maximum geothermal reservoir protection by thoroughly exiting from the fractures,and its application is a promising temporary shielding technology for fractured carbonate geothermal reservoir,which provides a novel technological method for efficient drilling and geothermal reservoir protection in Xiong’an New Area.