Objective The aim of the project is to design, construct and test a wireless transmission system installed permanently in a production well. This system removes the need for a cable installation by using the hardware already existing in the well : the production tubing and the casing. Once electrically insulated from each other via an insulating completion fluid, the tubing and the casing behave like a coaxial transmission line which can be used to power the downhole instrumentation and to transmit the coded signals. The first market application is permanent well monitoring. By removing the cable installation, practically, safety and reliability are improved while the cost and complexity are minimized.After installation of the tubing casing telemetry prototype for shell-Brunei, the monitoring phase has been completed. The system is operational and has been used for reservoir pressure and temperature transmission. The project completed with positive results. We are reviewing the design for installation of other tubing casing telemetry systems in the same area (Offshore Brunei).The tubing casing telemetry is being proposed to various clients for commercial installations. The system has been modified for cost reduction and optimum electrical efficiency. Also, work is being done to get a generic design which can be easily adapted to various well completions. This achieved by replacing the inductive coupler by an insulated sub. The objective is to conduct a few installations in 98The tubing and casing are electrically isolated in the well by placing insulated centralizers and by filling the annulus with a non-conductive fluid such as diesel. The tubing and casing are electrically shorted at the bottom of the well by the packer and on the top by the tubing hanger. A current loop is established along the tubing-casing line by a toroidal current transformer located below the wellhead (surface antenna). The electrical energy is recovered downhole by a bottom antenna, similar to the top one, in order to power the instrumentation. The measured downhole pressure and temperature are transmitted uphole using a specific modulation. Programme(s) ENG-THERMIE 1 - Programme (EEC) for the promotion of energy technology in Europe (THERMIE), 1990-1994 Topic(s) 5.2 - DRILLING Call for proposal Data not available Funding Scheme DEM - Demonstration contracts Coordinator Schlumberger EU contribution No data Address 26 rue de la Cavée 92140 Clamart France See on map Total cost No data
