2011-08-04_HYDROLOGY - P2008046

• Permit No: P2008046
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/4/2011
• Doc Name: Pad cement evaluation
• From: American Shale Oil, LLC
• To: DRMS
• Email Name: THM
• Email Name: DB2
• Media Type: D
• Archive: No

Mr. Travis Marshall
Mr. Kent Walter
Ms. Wendy Cheung
Page 4 of 6
poor from the upper R8 (696 ft bgs) through the Uinta Formation to the top of the logged interval (46 ft
bgs).
TM -5 (Attachment F)
CAST -M log completed: May 6, 2011
Casing Depth: 2,294 ft bgs
Interval Logged: 40 —1,947 ft bgs
The ACE report prepared by Halliburton indicates the cement to pipe bond is adequate from the bottom of
the log (1,947 ft bgs; lower R2) to the middle of the Uinta Formation (258 ft bgs The bond is rated as
good from the bottom of the log (lower R2) to the middle of the Uinta Formation (258 ft bgs) and poor
from the middle of the Uinta Formation (258 ft bgs) to the top of the logged interval (40 ft bgs).
TM -6 (Attachment G)
CAST -M log completed: May 6, 2011
Casing Depth: 2,292 ft bgs
Interval Logged: 35 — 2,197 ft bgs
The ACE report prepared by Halliburton indicates the cement to pipe bond is adequate from the bottom of
the log (2,197 ft bgs; upper RO) to lower Uinta Formation (346 ft bgs) and within the upper Uinta
Formation from 96 ft bgs to the top of the logged interval (35 ft bgs). The bond is rated as good from the
bottom of the log (upper RO) to the middle of the R8 (726 ft bgs), fair from the middle of the R8 (726 ft
bgs) to the lower Uinta Formation (346 ft bgs), poor though the middle of the Uinta Formation, and fair
within the upper Uinta Formation (96 ft bgs to the top of the logged interval [35 ft bgs]).
BH -1 (Attachment H)
CAST -M log completed: June 10, 2011
Casing Depth: 2,017 ft bgs
Interval Logged: 366 — 2,016 ft bgs
The ACE report prepared by Halliburton indicates the cement to pipe bond is adequate from the bottom of
the log (2,016 ft bgs; upper R1) to the lower Uinta Formation (366 ft bgs). The bond is rated as good
throughout the entire interval logged, suggesting adequate isolation of water - bearing zones between the
bottom of the log and lower Uinta Formation. The upper limit of the CAST log is constrained by the
water level surface in the well casing; the CAST method requires that the tool is submerged in water.
Summary and Conclusion
The primary objectives of placing cement seals within the annulus of the referenced wells are to ensure
containment of the retort-test interval and isolation of hydrostratigraphic units, and thereby prevent cross -
hole communication among the units. These objectives are assessed separately below.
Containment of Retort Test Interval
The Halliburton evaluations indicate that for each well, the cement to pipe bond is adequate from the
bottom of the log to the top of the confining zone extending from the retort test interval (R1) to the
dissolution surface and including the L 1, R2, L2, and lower R3. Except for well TM -2, the cement to pipe