Sensor can replace rigs

July 20, 1999, 10:00 CEST

A new type of downhole metering device for water injection wells could eliminate the need to use drilling rigs for such logging work.

By maintaining a continuous watch on the oil/water contact in an injection well, the Water Monitoring Radar provides a unique opportunity to see how quickly the water front is displacing the oil.

This information increases reservoir understanding, enhancing opportunities for producing the field more efficiently.

Such continuous monitoring could replace the conventional saturation logging, which requires the use of a rig.

"That means substantial savings could be made, particularly on subsea fields which lack a fixed platform with its own derrick," says reservoir engineer Synøve Tevik in Statoil's Norne organisation.

The sensor is due to be installed in a new water injection well scheduled for next summer on Norne, which lies in the Norwegian Sea.

Ms Tevik notes that this technology also makes it possible to calculate how much oil will be left in a reservoir after it has been flooded by water.

The prototype Well Monitoring Radar has been developed by Statoil in cooperation with Norway's Smedvig Technology and the Norwegian Geotechnical Institute.

"Test results show that the sensor meets all the requirements set for design, robustness, metering range and accuracy," says Ms Tevik.