CARBONRT helps determine if fractures are growing past packers
The operator was looking for a way to optimize stage spacing in their fracture treatment design with a primary concern that fractures were growing past packers.
CARBO alternated between CARBONRT (with its non-radioactive tracer) and CARBOLITE to create contrast between stages. If CARBONRT was detected in the non-NRT stages, it was determined that the NRT fractures had grown past the packers.
Stages 1, 3, 5 and 7 used CARBONRT with stages 2, 4 and 6 using CARBOLITE without NRT. This allowed for three situations to indicate if propped fractures were growing vertically out of the intended zone and three situations to determine if propped fractures were growing downward past the plug.
The client was able to trace the CARBONRT and determine that in none of the situations did the propped fractures grow excessively vertically and into the next stage’s area. Excessive growth down past the packer did occur in stage 5, resulting in 8 ft of propped fracture growth into the stage 4 area. Stage 3 had minor growth downward past the packer into the stage 2 area. Stage 7 was fully contained, with no growth past the packer.
Fracture was contained in stage 7; 141 ft total stage frac
About 8 ft of propped frac height bypassed packer into
stage 4; 110 ft total stage frac height.
Author(s): Mark Chapman