| Engineer | Form: (06 )
401608143
6/8/2018 | Plugging
• Provide 48 hour notice of plugging MIRU via electronic Form 42.
• COGCC Change: Increase cement volume for Nio squeeze at 7400’ to 65 sx for 200’ over top of Nio.
• COGCC Change: Increase cement volume for Nio csg plug to bring TOC to 7255’.
• COGCC Change: Corrected cement volume and TOC for 8 5/8” csg to 25 sx based on Doc #50721
• COGCC Change: Corrected hole size to 7 7/8” for reentry.
• Run CBL on 4 ½” csg prior to pumping shoe plug to confirm TOC. Cut and pull 4 ½” csg as close to TOC as possible. Run CBL on 8 5/8” to confirm TOC. Cut and pull 8 5/8” as close to the TOC as possible. Cement open hole to surface. Contact COGCC Engineer if conditions are not as represented in this NOIA.
• COGCC Change: Cement coverage required from 1030-617’, starting inside 4 ½” csg and ending in outer most casing or open hole depending on TOC on both strings of casing. Adjust cement volume accordingly.
• Correct WBD to reflect current and plugged configuration based on P&A results and submit with Form 6 SRA.
• Check for fluid migration or shut-in pressure on the well prior to pumping any plug(open hole, annular or casing) that isolates deepest aquifer or the surface casing shoe (whichever is deeper). Contact COGCC Engineer for revised plugging orders if well is not static at this time, prior to continuing with plugging operations.
• Tag required if the shoe plug, or combined stub/shoe plug, is not circulated to the surface and top of cement must be 50’ into the shoe, or 50’ above the stub, whichever is shallower.
• Place a 50' plug (minimum) at the surface, both inside the inner most casing and in all annular spaces. All other cement plugs, without mechanical isolation, shall have at least 100' of cement left in the casing.
• Properly abandon flowlines as per Rule 1103. File electronic Form 42 once flowline abandonment is complete.
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| Engineer | Form: (06 )
401608143
6/8/2018 | Bradenhead Testing
• Prior to the start of plugging operations, a bradenhead test shall be performed and reported if there has not been a reported bradenhead test within the 60 days immediately preceding the start of plugging operations.
• If any of the following conditions exist then sampling of all fluids is required and sampling methods shall comply with Operator Guidance – Bradenhead Testing and Reporting Instructions, Appendix A: Liquid and Gas Sampling as found on the COGCC website, cogcc.state.co.us.
1) The initial pressure measurement on the bradenhead is greater than 25 psi, prior to blowing down any liquid or gas from the bradenhead valve, or
2) Pressure remains at the conclusion of the test, or
3) Any liquids are present anytime during the test. If so, then stop the test as soon as liquids are present and sample before resuming the test.
• Form 17 Bradenhead Test Report shall be submitted within 10 days of the test.
• If samples are collected, copies of all final laboratory analytical results shall be provided to the COGCC within three (3) months of collecting the samples.
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| Engineer | Form: (06 )
401608143
6/8/2018 | Venting
Operator shall implement measures to control unnecessary and excessive venting, to protect the health and safety of the public, and to ensure that vapors and odors from well plugging operations do not constitute a nuisance or hazard to public welfare.
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