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本文描述了一种新型隔离体系,这种体系只有当水泥完整性出现问题时,才会被激活。该体系在有油气流时通过膨胀会自动迅速地形成一个水力屏障,一旦被激活,它将封隔损害区域;假如在生产或废弃期间再次发生进一步损害,它甚至能被再次激活。该体系具有与传统水泥体系等效的特性,不需要对标准地面设备进行改造。高压静态和动态实验室测试证明了该体系能在30min内迅速隔断气流。油田现场试验也突显了该体系的强度,因为近来使用该体系的许多油气井均未发生泄漏。
This article describes a new type of barrier system that is activated only if there is a problem with the integrity of the cement. The system automatically swiftly forms a hydraulic barrier when expanded with oil and gas flow and, once activated, will seal off the damaged area; it may even be reactivated if further damage occurs during production or disposal. The system has the characteristics of the traditional cement system equivalent, do not need to standard ground equipment to transform. High-pressure static and dynamic laboratory tests show that the system can quickly cut off the air flow within 30min. Field tests in the field also underline the strength of the system, as no leaks have occurred in many wells recently using the system.