The ability of REED to change the properties of the annular can provide critical information in real time or post expansion. Identifying the exact depth of gas sources into the annulus can be difficult using conventional casing wireline tools, particularly in the case of multiple sources. Carbon isotope tests from gas recovered at surface can be inconclusive if there are multiple sources.
Cementing bonds logs only show the existence of cement outside the casing. Better understanding of the extent and locations of channels or poor cement can increase the effective of remedial sealing operations.
This multi-finger casing log shows the existence of channels or poor cement on two sides of the casing. REED does not rotate. The consistent casing ID expansion on two sides of the casing about 0.5m show a longer vertical cement quality phenomenon not detected with wireline.
This real-time report from a surface vent flow monitor shows the impact of REED during setting. While the cement was so poor that expansion did not result in complete sealing, all five expansion are shown in real time by the significant flow/pressure drop when the tool was fully expanded. This is an excellent interval in which to perforate and inject sealing because it is: a) clearly above the gas source and b) the expansions will result in improved sealant placement.