USING TERI TO MONITOR A HORIZONTAL SEGMENTED WELL

Segmented horizontal wells allow discrete locations of the subsurface to be tested or treated based on their design. Temporal Electric Resistivity Imaging (TERI) is a geophysical method which directs electric current into the subsurface by way of electric nodes attached to the ground and evaluates the differences between multiple surveys. The result of TERI data is a two-dimensional image which depicts the changes in bulk conductivity of the subsurface. This study tested mapping the location of an injection of low electrical conductivity laboratory water using TERI to determine the sensitivity of the method to injection volume. This was achieved by consecutively running two parallel ERI lines, four meters apart, and attaining a set of temporal images. De-ionized water was then pumped into the subsurface via three separate ports in a segmented horizontal well, which lies beneath the upgradient TERI line. The result demonstrates a weak signal that varied based on the local hydrogeology of the injection port. The results provide good insight in signal strength and pattern expected at segmented horizontal well ports in TERI datasets.