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2010-02-22_REVISION - C1981022
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2010-02-22_REVISION - C1981022
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Entry Properties
Last modified
8/24/2016 3:59:55 PM
Creation date
2/24/2010 9:01:37 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981022
IBM Index Class Name
REVISION
Doc Date
2/22/2010
Doc Name
Adequacy Review
From
DRMS
To
Oxbow Mining, LLC
Type & Sequence
TR66
Email Name
MPB
Media Type
D
Archive
No
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Installation and Completion - Rules 3.03.2. 4.03.2. 4.04, 4.05.13(1)(e), and 4.07 <br />Methane drainage wells are often in remote areas. Access to the drill pads should <br />minimize new road construction when possible. Proper installation and completion of <br />the wells ensures that the gas will be vented to the atmosphere during operations and <br />not migrate to other areas that could result in environmental or safety concerns. Similar <br />to a water well or a commercial gas well, the productive zone(s) must be isolated during <br />well installation and completion. Proper completion is also necessary to ensure that <br />abandonment of the well can be successfully accomplished. <br />Permitting materials regarding installation and completion should include at a minimum: <br />• A map of access roads, and typical designs for new roads, to each drill pad; <br />• A map of proposed well locations; <br />• Sediment control, mud pit, and equipment information; <br />• Detailed text discussion of the well installation procedure; and <br />• A proposed well completion diagram including: <br />• All casing diameters <br />• Total well depths <br />• Perforated interval(s) <br />• Depth to all proposed packers or cement baskets <br />• Type of cement or grout to be used <br />• Calculation of annulus volumes to be cemented <br />• A reclamation cost estimate <br />Geologic fogs must be recorded during drilling to note depths of water or gas inflow <br />encountered during drilling. A high quality completion, that ensures filling of the entire <br />annulus with cement surrounding the solid cased portion of the well will be required. <br />During cementing operations, plugs should be tagged before cementing begins and <br />tagged after each individual pour of cement or grout. Cement should be placed by <br />positive displacement using either the well casing or a tremie pipe from the bottom up. <br />Cement grout should not be poured from the surface. The type of cement or grout mix <br />should be specified, as well as the amounts estimated to be used for each separate <br />cementing operation. It is recommended that sulfate resistant cement be used for <br />sealing the annulus during well completion and subsequent plugging and abandonment <br />procedures. If necessary, centralizers should be used during completion, based on hole <br />conditions recorded during drilling. <br />The key to a successful abandonment is a high quality completion in which the entire <br />annulus is filled with cement. Responsible and careful operational practices <br />demonstrated by the driller and coalmine operator will result in high quality completions. <br />The operator must ensure that the methane drainage well has an adequate cement seal <br />in the annulus, and has been constructed such that it will allow for permanent sealing of <br />the gas producing zone during the abandonment phase. The methane drainage well <br />completion designs must include an abandonment plan that ensures proper sealing can <br />2
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