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Real World Pressure Buildup Issues
Brian Graves
TCEQ UIC Symposium
UIC Land Ban Coordinator
May 6, 2015
Reservoir Pressure Trend
3316 psia
2248 psia
Allowable injectionpressure riseof 1068 psi
Annual falloff injecting pressures corrected for skin factor in psia
.2818 psia 2012
*
*
2012 range3340-3150 psia
2816 psia 2013
*
*2013 range3255-3125 psia
.
Approved Petition Compliance Limit*
2014 3472 psia
. 2853 psia 2014
Source Well Layout and Forecast Rates in Pressure Build Up Model
185 GPM235 GPM
230 GPM
50 GPM
40 GPM
0 GPM
Sealed Boundary
Class I well
4-14-14
American Association of Drilling Engineers (AADE) 2005 National Technical Conference and Exhibition (NTCE)
Summary• Rapid development in Haynesville-Bossier and Cotton
Valley formations have caused related dramatic increases in injection of produced water volumes in East Texas.• This increased injection has resulted in increased injection
reservoir pressures that have caused:• High bradenhead pressures (potential threat to USDWs).• Surface breaches that can cause surface contamination.• Production well casing leaks.
Conclusions• Pressure capacity has been reached in some reservoirs. • This will have permitting implications for industry (non-
renewals or investigations for new/deeper formations to inject into).• These conditions significantly increase the risk to
USDWs and warrant a more holistic approach to injection well regulation.