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国民油井华高公司(National Oilwell Varc)开发的可回收随钻测量系统BlackStar Ⅱ具有电磁遥传(Electromagnetic,EM)和泥浆脉冲遥传(Mud-pulse,MP)这2种数据传输能力。该系统通过EM或RPM下行传输实现电磁遥传与泥浆脉冲遥传2种作业模式之间的切换,从而降低了因重新起下钻更换设备带来的成本。该系统采用模块化设计,实现了井下仪器串的灵活配置,最大程度提高了系统的随钻测量能
The BlackStar II, a reusable MWD measurement system developed by National Oilwell Varc, has two types of data transmission capabilities: Electromagnetic (EM) and Mud-pulse (MP). The system switches between two modes of operation, remote electromagnetic and mud pulse remote transmission via EM or RPM downstream transmission, reducing the cost of replacing a device with a new drill. The system uses a modular design to achieve the flexible configuration of the instrument string downhole to maximize the system while measuring the energy