Refracturing in the Eagle Ford Shale: One Operator's Quest to Identify and Rank Candidates, Minimize Well Interference, and Understand Variability of Results
One of the main objectives of a refracturing operation is to increase
oil and gas production while avoiding the costs associated with completing a
new well. Alternatively, refracturing may also be employed to protect existing
producers against detrimental fracture hits from new infill wells, because when
a fracture hit on the parent occurs, there is a significant chance that some or
all of the parent well production may be lost; or that the child well realizes
a lower EUR than the parent.
In this study, an operator in the Eagle Ford shale conducted their first
refracturing program to trial technology and determine if the incremental
production justified the investment. This paper explains the candidate
selection process of analyzing and ranking all candidates the operator put
forth. Furthermore it discusses the design process, execution, and results of 5
wells that were selected to refracture.
Advanced fracturing concepts were tested as part of this study including
a new far field diverter to avoid pressure hits on offset existing wells and
trying to protect parent wells from child well stimulation treatments.
Diagnostics, including a novel wellhead surveillance network, were utilized to
monitor the impact of new refracturing stimulation treatments on both
stimulated wells and offset producers. The field execution, impact of the
various technologies, and production results are also discussed in the