Metrol Technology Limited

Steve Martin Hudson

Leslie David Jarvis

Axel May

A downhole communication system for communication between a first and second location in a subsea oil and/or gas well installation. The oil and/or gas well installation comprises out of hole metallic structure comprising a riserrunning upwards away from the mudline ML, and downhole metallic structurerunning down into the well. The communication system is arranged so that at least part of a signal path for communications between the first and second locations is provided by the downhole metallic structuresuch that, in use, data to be communicated between the first and second locations is carried by electrical signals in the downhole metallic structure. The communication system further comprises a first noise cancellation arrangement arranged for sensing a noise signal generated in the out of hole metallic structure and arranged for applying a corresponding noise cancelling signal to the out of hole metallic structure or the downhole metallic structure to inhibit introduction of electrical noise into the downhole metallic structurefrom the riser

Downhole communication

Well installations and methods for constructing wireless ready well installations. The installations comprise downhole metallic structure () and downhole repeater apparatus () for receiving signals and in response transmitting signals onwards. The repeater apparatus () are arranged for at least one of receiving the signals by picking up at least one of electrical and acoustic signals from the downhole metallic structure and transmitting the signals onwards by applying at least one of electrical and acoustic signals to the downhole metallic structure. Various arrangement and methods are described to allow provision of well installations ready for wireless communications.

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Aberdeen, United Kingdom

Steve Martin Hudson