Downhole data communication

Details Downhole data communication Downhole data communication

E - Fixed Constructions

21

B

E21B 47/18 (2006.01)

Patent

CA 2755402

A method of downhole data communication in a well in which there is a flow of product from the formation towards the surface, the data communication taking place between two locations in the flow path, at least one of which is downhole in the well, and the method comprising the steps of controlling a flow rate of the product at a first of the two locations in dependence on data to be transmitted; detecting, at the second of the two locations, the effect of said controlling of the flow rate of the product at the first location; using the results of the detecting step to extract the data transmitted; and keeping the nominal flow rate at the first location at a state for at least a minimum period chosen to allow this change in state to propagate to the second location.

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