Method of monitoring a reservoir

Abstract

A method of monitoring a reservoir comprising setting at least one barrier (22a, 22b) in a well (14) separating it into upper and lower isolated sections. A perforating gun or other perforating device (54) is provided in the lower isolated section (90A), along with a control mechanism (52, 152), wireless communication device and a pressure sensor (51). After the barrier is set, the perforating gun is activated in order to create at least one perforation between the well (14) and a surrounding reservoir. The well (14), or part of it, is suspended or abandoned but the pressure is still monitored and a wireless, preferably acoustic or electromagnetic, data signal is transmitted from the lower isolated section (90A) to above the barrier. Data from the suspended / abandoned part of the well may be used to infer characteristics of the reservoir so that it may be exploited more appropriately especially through another well. [Figure 1]