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GENERAL51561
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Last modified
8/24/2016 8:37:46 PM
Creation date
11/23/2007 6:55:05 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980006
IBM Index Class Name
General Documents
Doc Date
8/5/2002
Doc Name
Borehole Closure Recommendations
From
Montgomery Watson Harza
To
BLM
Permit Index Doc Type
Exploration
Media Type
D
Archive
No
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Sten 2 (Tag bottom) <br />Insert a wireline into the borehole and determine the depth to which the line will reach. The most <br />desirable outcome is for the wireline to reach the original drilled total depth. If the wireline does not <br />reach iota] depth the plugging procedure outlined below will have to be modified. <br />Step 3a (wells where the wireline reached within 10-20 feet of original depth or through the coal bed) <br />Via awireline-conducted tool, perforate the pipe starting at the bottom. The pipe should be perforated <br />every 20 feet. The perforating should be designed to maintain the integrity of the pipe. After <br />perforating, insert coiled tubing into the hole to bottom. Pump cement down the coiled tubing. After <br />pumping the cement plug of sufficient volume to fill the hole 50 feet above the top of the coal bed as <br />per the 1979 U.S.G.S abandonment diagram, the coiled tubing is raised. The interval above the cement <br />plug can be filled with heavy mud or cuttings as per the 1979 U.S.G.S. abandonment diagram. The <br />surface plug procedure is very similaz. For wells that do not have a cement collaz the cement is <br />pumped into the annulus between the pipe and borehole and inside the pipe. For wells with a cement <br />collar the pipe should be perforated below the cement collar (2 holes over ten feet). Pump cement into <br />the pipe and monitor for surface returns. <br />Step 3b (wells where the wireline does not reach 10-20 feet of original total depth or doesn't penetrate <br />the coal bed) <br />Insert coiled tubing into the pipe to the indicated wireline depth. Pump drilling fluid (water) down the <br />coiled tubing and try to clean out the pipe and reach original total depth. If the wireline reaches <br />between 10 to 20 feet of total depth or through the coal bed, the procedures outlined in Step 3a can be <br />utilized. <br />If total depth cannot be reached, the pipe will need to be retrieved or drilled up. Initially the effort <br />should be to retrieve the pipe by mechanical means. If this procedure is ineffective then a rig capable <br />of drilling will have to be utilized. The pipe should be drilled out and then appropriate cement and <br />heavy mud plugs can be utilized. <br />Drilling of the pipe should be the last resort. By introducing drilling operations there is a chance that <br />the bit will leave the original borehole and start a new borehole. <br />Drilling procedures appear to be the only option for well #79-1. This well has only 180 feet of pipe in <br />a wellbore that was drilled to a total depth of 500 feet. <br />Steg 4 <br />If pipe is left in the hole, cut off the pipe below ground surface. Install permanent abandonment <br />mazker. <br />The procedures outlined above are designed to meet or exceed the abandonment specifications <br />as originally proposed in the original 1979 coal lease. These procedures are also designed to minimize <br />surface environmental damage with reasonable expenditures. <br />
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