TENNESSEE GAS PIPELINE COMPANY

Incident Narrative

AN INJECTION/WITHDRAWAL WELL WAS FOUND TO BE VENTING NATURAL GAS FROM THE 9-5/8"" X 7"" ANNULUS. BELOW IS A LIST OF ACTIONS TAKEN IN ORDER TO SECURE THE WELL: RETRIEVABLE BRIDGE PLUG SET AT 5,180' 7"" CASING BLOWN DOWN CASING FILLED WITH 9.5 PPG BRINE CEMENT BOND LOG WAS RUN CASING INSPECTION LOG WAS RUN ON AUGUST 2, 2017 GAMMA-RAY, NEUTRON, TEMPERATURE LOG WAS RUN ON AUGUST 2, 2017 THE GAMMA-RAY, NEUTRON, TEMPERATURE LOG INDICATES THERE IS POSSIBLY A COLLAR LEAK AT 1010'. THE WELL IS SECURE. 49CFR 191.15 REQUIRES THE USE OF PHMSA FORM F 7100.2 FOR REPORTING INCIDENTS (AS DEFINED BY 49CFR 191.3) ON UNDERGROUND NATURAL GAS STORAGE FACILITIES. IN ORDER TO SUBMIT THE REPORT, FORM 7100.2 REQUIRES A MAOP AND PIR VALUE (FORM PART E2 AND PART D3, RESPECTIVELY) WHICH ARE NOT APPLICABLE IN THE CASE OF THIS REPORTABLE INCIDENT. THE MAOP ENTERED IN THIS REPORT IS FOR THE ASSOCIATED GATHERING SYSTEM. THE PIR HAS BEEN CALCULATED USING THE MAOP OF THE GATHERING SYSTEM AND CASING SIZE. TGP HAS PLUGGED THE WELL BUT, MAY REPAIR AND BRING IT BACK ONLINE IN THE FUTURE. ALTHOUGH REPORT FORM 7100.2 PART A, ITEM 15B REQUIRES A SUPPLEMENTAL REPORT, BECAUSE OF THE UNIQUE ATTRIBUTES OF UNDERGROUND STORAGE FACILITIES, THIS REPORT HAS BEEN SUBMITTED AS FINAL. UNLESS THERE ARE ADDITIONAL SIGNIFICANT CHANGES RELATED TO THE EVENT (NOT ANTICIPATED), ADDITIONAL SUPPLEMENTAL REPORTS WILL NOT BE SUBMITTED. FURTHER ACTIONS, SUCH AS WELL REACTIVATION, WILL BE REPORTED TO PHMSA UNDER EXISTING REGULATORY REPORTING REQUIREMENTS (E.G., ANNUAL REPORTS AND/OR 49CFR 191.22 REQUIREMENTS). THE INVESTIGATION HAS BEEN COMPLETED TO THE EXTENT POSSIBLE AND THE CAUSE OF THE LEAK IS UNKNOWN.