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Drilling Activity for August 9, 2009
Well: APS Cholla Pilot CO2 Well
Rig: WDC Rig 161
Activity: Ran Formation Evaluation Logs; Attempt to Collect Formation Water Sample
Drilling progressed from 956 ft to 960 ft at an average rate of penetration (ROP) of 4 ft/hr. The workstring was retrieved from the wellbore. Schlumberger Wireline Services was rigged up and its Platform Express logging suite was logged from 957 ft to 62 ft wireline measurement. The suite included spontaneous potential, gamma ray, 1-arm caliper, array induction resistivity, density porosity, and neutron porosity logging tools. The wireline equipment was rigged down.

An attempt was made to collect a formation water sample from the Schnebly Hill formation. WDC personnel placed gravel in the open hole from 960 ft to 890 ft. A bentonite seal was placed above the gravel from 890 ft to 882 ft (calculated depth interval). A joint of slotted pipe (20 feet of slots) was attached to the workstring and lowered into the wellbore and placed at 884 ft, with the slots placed in the interval from 882 ft to 862 ft. A borehole inclination survey was run and indicated 0 degrees inclination at 860 ft. Gravel was placed in the annular space to a calculated depth of 857 ft and bentonite was placed in the annular space to a calculated depth of 849 ft.

Air was circulated through the workstring to lower the hydrostatic head and induce the well to flow. Flow from the well was achieved and sustained at approximately 25 gallons per minute (gpm). Analysis of fluid samples indicated wellbore fluids were being circulated through the slotted pipe. Additional bentonite chips were fed into the wellbore in an attempt to create an upper seal, with no success. After 3 hours of flowback at 25 gpm, recovered fluids were confirmed as wellbore fluids, as the upper bentonite seal failed to prevent wellbore fluids from entering the slotted pipe. The air line was retrieved from the bore of the workstring and the crew began retrieving the workstring from the wellbore.

Observations  
  • Daily activities summarized to 6:00 am August 10.  
  • Drilling measurements are referenced from kelly bushing (KB) of Bearcat drilling rig (12 ft above GL).
  • Conductor pipe: 14" OD, set at 47 ft KB.
  • Mud loggers picked top of Schnebly Hill formation at 608 ft.
  • Water losses to formation: 400 bbl/24 hrs; Cumulative: 2370 bbl
 
Drilling Activity for August 10, 2009
Well: APS Cholla Pilot CO2 Well
Rig: WDC Rig 161
Activity: Run and Cement 9-5/8" Casing
The workstring was retrieved from the wellbore and a 12-1/4" bit and one drill collar were assembled. The workstring was lowered into the wellbore to 610 ft, where drag was experienced due to bentonite strung along the borehole. The kelly was assembled and the hole was washed and reamed from 610 ft to 960 ft. The well was circulated until fluid returns were clean. The workstring was retrieved from the wellbore and laid down.

A pre-job safety meeting and job safety analysis on running casing was held and casing running equipment was rigged up. A total of 25 joints of casing (9-5/8" OD, 36 lb/ft, Grade J-55, STC connection) were assembled and lowered into the wellbore. The casing located the bottom of the wellbore at 959 ft.

A pre-job safety meeting and job safety analysis on cementing was held, and cementing equipment was rigged up. The well was circulated while the casing was reciprocated to clean the hole and cementing operations began. The well was cemented with 178 sacks (67 bbl) lead cement mixed at 12.5 lb/gal density and 69 sacks (14.4 bbl) tail cement mixed at 15.5 lb/gal density. The cement was displaced with 71 barrels of fresh water until the cement wiper plug was seated in the float collar. Fluid returns were present during the entire cement job and a total of 30 barrels of cement were circulated to surface. The cementing equipment was rigged down and released from service. WDC personnel began cleaning the rig tanks and rigging down in preparation for demobilization of WDC drilling equipment, to be followed by mobilization of Bearcat Drilling Rig No. 2 to site.

Observations
  • Daily activities summarized to 6:00 am August 11.
  • Drilling measurements are referenced from kelly bushing (KB) of Bearcat drilling rig 12 ft above ground level (GL).
  • Conductor pipe: 14" OD, set at 47 ft KB
  • Surface Casing: 9-5/8" OD, 36 lb/ft Grade J-55 STC; set at 958 ft below the KB.
  • Water losses to formation: 200 bbl/24 hrs; Cumulative: 3220 bbl

Drilling Activity Archive


 

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