Well monitoring

摘要

Downhole water level detecting apparatus for detecting the level of water in a formation in the region of a well installation. The detecting apparatus includes a transmitter for applying electrical signals to a signaling loop at a first location. The signaling loop includes a downhole metallic structure of the well installation and an earth return. The detecting apparatus also includes a detector for monitoring electrical signals in the signaling loop, and an evaluation unit arranged for determining a level of water in the formation relative to the downhole metallic structure in dependence on the monitored signals.

主权项

1. Downhole water level detecting apparatus for detecting the level of water in a formation in the region of a well installation, the detecting apparatus comprising:
a transmitter for applying alternating current electrical signals to a signalling loop at a first location, the signalling loop comprising downhole metallic structure of the well installation and an earth return, a detector for monitoring electrical signals in the signalling loop, and an evaluation unit arranged to determine a level of water in the formation relative to the downhole metallic structure in dependence on the monitored signals, wherein the detector comprises a receiver for receiving signals from the signalling loop at a second location, and the evaluation unit is arranged to determine a level of water in the formation relative to the downhole metallic structure in dependence on the received signal strength, and wherein the transmitter is arranged to inject signals into tubing of the well installation and the receiver is arranged to extract signals from the tubing of the well installation.