Replies to post #186513 on ERHC Energy Inc (ERHE)

[miamidrift]

I'll have to defer to Pepsi on this one, it is a bit of info over my pay grade.

[kownski]

Walldog,
Sounds like they started with smaller pipe, thus smaller drill bits and drilling a lot faster.

They must have found something in the samples that looked good to them to run all those logs.

7" OD casing would be as big as they can run in a 8 1/2 hole.

But the best part is 6 floaters!! To me!

John

[RKT989]

they have drilled a long way in a short amount of time..Maybe it's ALL sand..
That would be good...lol

[vip1999]

WD, something I googled, don't know much of it but seem very positive. I will learn more as I go(very interesting stuff).

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http://www.co2sink.org/techinfo/drilling.htm

 
 Logging Section 
  Bit Size 
  Casing 
  Lithology 
  Log Type 
  Estimated Log Time 
   
 0-150 m (open hole) 
  20" 
  18 5/8" 
  Basis Rupelfolge 
  Caliper, Borehole Orientation, Spectrum GR, Density, Sonic 
  5 hr 
   
 0-150 m (cased hole) 
  20" 
  18 5/8" 
  Basis Rupelfolge 
  Cement Bond Log, Variable Density Log 
  5 hr 
   
 OPTIONAL: 
  
 150-360 m (open hole)  
  17 1/2" 
  13 3/8" 
  Weser Formation 
  Caliper, Spectral GR, Mud Parameter, Borehole Orientation, SP, Sonic Velocity, Resistivity, Bulk density 
  12 hr 
   
 OPTIONAL: 
  
 150-590 m (cased hole) 
  17 1/2" 
  13 3/8" 
  Weser Formation 
  Cement Bond Log, Variable Density Log 
  5 hr 
   
 150-590 m (open hole)  
  12 1/4" 
  9 5/8" 
  Weser Formation 
  Caliper, Spectrum GR, Mud Parameter, Borehole Orientation, SP Sonic Velocity, Resistivity, Bulk Density, Neutron Porosity 
  12 hr 
   
 150-590 m (cased hole) 
  12 1/4" 
  9 5/8" 
  Weser Formation 
  Cement Bond Log, Variable Density Log 
  5 hr 
   
 590-802 m (open hole) 
  8 1/2" 
  5 1/2" 
  Grabfeld Formation 
  Caliper, Spectral GR, Mud Parameter, Borehole Orientation, SP Sonic Velocity, Resistivity, Bulk Density, Neutron Porosity 
  24 hr 
   
 590-802 m (cased hole) 
  8 1/2" 
  5 1/2" 
  Grabfeld Formation 
  Cement Bond Log, Variable Density Log, Ultrasonic Imager Tool 
  12 hr 
   
 590-802 m 
  8 1/2" 
  5 1/2" 
  Grabfeld Formation 
  Optional: Pulsed Neutron, RST, NMR, FMI, DSI, USIT 
  36 hr 
   
 (700 m) 
        Downhole Fluid Sampler 
  5 hr 
   
 

[vip1999]

if you have some time WD, read this one too. I think this one is for land drilling

http://www.epa.gov/region09/water/groundwater/uic-pdfs/AppendixcWellDrillingProcedure.pdf

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DRILLING PROCEDURE
CONDUCTOR HOLE
1. Prepare surface pad location and install well cellar.
2. Mobilize drilling rig. Perform safety audit during rig-up to ensure that equipment setup complies with project requirements.
3. Notify Arizona Oil and Gas Conservation Commission at least 48 hours prior to
spudding the well.
4. Drill mouse and rat holes.
5. Drill 17-1/2” conductor hole to +/-40 feet. Install 13-3/8” casing and grout annular space from set depth to surface with concrete.
6. Wait on concrete to cure for 12 hours.
SURFACE HOLE
7. Rig up mud logging unit and test equipment. Collect and save 10-foot samples from 40 feet to total depth. A set of samples is required to be submitted to the Oil and Gas Administrator, Arizona Geological Survey, within 30 days of completion of the well. Samples should be: 1) washed and dried, 2) place approximately 3 tablespoons of sample in an envelope identifying the well, the well location, the Arizona Oil and Gas Conservation Commission’s Permit Number, and the depth of the sample. Samples to be shipped to:
Oil and Gas Administrator
Arizona Geological Survey
416 West Congress, Suite 100
Tucson, AZ 85701
L-2
8.
Pick up 12-1/4 inch bit and the bottomhole assembly (BHA). Drill a 12-1/4 inch surface hole to +/-965 feet (below base of Schnebly Hill) using freshwater spud mud, as detailed in the Drilling Fluids Program section below. Take deviation surveys every 500 feet and at total depth. The recommended maximum allowable deviation from vertical is 3 degrees with a maximum recommended deviation of no more that 2 degrees per 100 feet (to minimize dogleg severity) at any point in the borehole. If the maximum recommended deviation is exceeded, an evaluation will be made to determine whether remedial action is necessary. After reaching surface casing setting depth, the drilling fluid will be circulated and conditioned to ensure correct fluid properties for the open hole logging and testing.
9.
Run open-hole formation evaluation logs per the requirements of the Well Logging, Coring, and Testing Program (See Attachment I above).
If the logging procedure is extended and/or hole becomes sticky or unstable during logging, a conditioning/cleanup trip will be made with the drill string to circulate and condition the drilling fluid. The drilling string will be removed from the well and the logging program will be completed as planned.
10.
Notify Arizona Oil and Gas Conservation Commission at least 48 hours prior to setting and cementing the surface casing.
11.
Lower the 12-1/4” drilling assembly in the well to the total depth. The drilling fluid will be circulated and conditioned to ensure correct fluid properties for the casing installation and cementing. Remove the drilling assembly from the well.
12.
Run 9-5/8 inch surface casing to +/-965 feet. See the Well Casing Specifications section above for a detailed description of the casing and casing equipment.
Reduce mud levels in surface circulating system and have additional tanks on hand to recover any excess mud or cement that may be circulated to the surface.
Designate a qualified person to observe the circulating system and monitor drilling fluid at all times during the cementing procedure. An accurate accounting of volumes will be critical information in the event that circulation is lost.
13.
Rig up circulating equipment and perform a pressure test on the lines. Circulate and condition the drilling fluid to ensure correct fluid properties for the cementing procedure. Reciprocate the casing continuously during the circulation of the drilling fluid.
14.
Cement the casing in place. Details of the cement blends proposed are located in the Well Construction Cementing Program section below.
Be prepared to divert cement and cement-contaminated drilling fluid returns away from circulating system and into appropriate containment. Use sugar to retard the premature setting of the cement, if necessary.
15.
If no cement returns are observed at surface, contact wireline service provider and schedule a temperature survey to determine the top of the cement.
16.
Center the casing in the rotary table of the drilling rig after completing the cementing procedure and before the cement hardens.
L-3
17.
Cement the annular space that does not contain cement, if required. Fill the annulus space by pumping cement through small tubing that has been run into the annulus to the top of cement.
18.
After waiting on cement to harden for a minimum of 12 hours, cut off the surface and conductor pipe and install a 9-5/8 inch SOW (slip-on for welding) x 11-inch 3,000-psi casing head flange. Perform a pressure test on the casing head after installation. Digitally record the test and maintain a copy of the test results on location. Transfer the original test data to the Sandia Office for inclusion in the CO2 Injection Well Report.

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