| Drilling/Completion Operations | Form: (02 )
400316025
10/30/2012 | “Prior to drilling operations, Operator may perform an anti-collision review of existing offset wells that have the potential of being within close proximity of the proposed well. This anti-collision review may include MWD or gyro surveys and surface locations of the offset wells with included error of uncertainty per survey instrument, and compared against the proposed wellpath with its respective error of uncertainty. If current surveys do not exist for the offset wells, Operator may have gyro surveys conducted to verify bottomhole location. The proposed well may only be drilled if the anti-collision review results indicate that the risk of collision is sufficiently low as defined by the anti-collision plan, with separation factors greater than 1.5, or if the risk of collision has been mitigated through other means including shutting in wells, plugging wells, increased drilling fluid in the event of lost returns or as is appropriate for the specific situation. In the event of an increased risk of collision, that risk will be mitigated to prevent harm to people, the environment or property. For the proposed well, upon conclusion of drilling operations, an as-constructed directional survey will be submitted to COGCC with the Form 5.”
At the time of permitting; the operator has identified the following well(s) as being within close proximity of the proposed well:
SPRABOE 27C-26HZ:
- GATES CYCLO GAS UNIT 1
- HSR-WALDBAUM 15-35 |
| Drilling/Completion Operations | Form: (02 )
400316025
10/30/2012 | It was agreed in a consultation with Anadarko personnel on September 10, 2012 that precautions shall be taken during drilling and/or stimulation to decrease the risk of communicating with both the Gates Cyclo Gas Unit #1 (API# 123-08404) the Shaklee Gas Unit #1 (API# 123-08346), producing wells. The referenced wells lack isolation of the ground water aquifers and Niobrara formation. To reduce the risk of impacting any un-isolated zones, no segments of the wellbore within 300’ of the referenced wells shall be stimulated. At the Operator’s discretion, a portion of or the entire 300’ setback may be created during the drilling of the proposed wellbore. If this option is selected, a revised directional drilling plan must be submitted via Sundry Form 4 prior to drilling to ensure the wellbore is still within the lease. Also at least ten (10) days prior to stimulation, the Operator shall provide a Form 4 and Form 5 for COGCC approval. The Form 4 shall detail the stimulation plan and any segment of the borehole to be eliminated from stimulation due to the setback referenced above. The Form 5 shall contain an uploaded directional template to confirm either the setback distances were created during drilling or any segment of wellbore that may not be stimulated. This Sundry notice shall be submitted via email to the appropriate engineer.
The identified setbacks could be eliminated by COGCC staff, if the Operator submits a Form 5 Final Drilling Completion Report and cement bond log documenting that remedial cementing has been performed to provide cement coverage from the current top of cement to 200’ above the Niobrara formation for both of the referenced existing wells prior to the stimulation of the proposed well.
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| Drilling/Completion Operations | Form: (02 )
400316025
10/30/2012 | Kerr McGee acknowledges and will comply with the COGCC Policy for Bradenhead Monitoring during Hydraulic Fracturing Treatments in the Greater Wattenberg Area dated May 29, 2012. |