Cardinal Surveys Company

Injection Profiles

Quick Discussion of profile methods:

Velocity Shots
Intensity Method


INJECTION PROFILE LOG

Well Parameters For Example Procedure
Injection 360 BPD Water BHT 123 F
Surface Pressure < 1,500 PSI Casing 5.5"
Tubing 2.875" PKR 5600'
Perforations 5700' - 6000' PBTD 6100'

Injection Profile Procedure
Your Company, Inc. Stallcup #45

The following procedure represents the fundamental steps needed to accomplish most Injection Profile applications. However, due to the investigative nature of production logging, it must be noted that the following procedure may be modified at any point in order to optimize the definition of events or abnormalities. This procedure should be considered as a general plan of action. For further information:  Adobe Acrobat (.pdf) Injection Profile Procedures Paper or other information.

  1. Conduct tailgate safety meeting to identify location hazards, review well information, review test objectives, and make necessary plans to maximize safety and test results. 
  2. Rig up Cardinal Surveys logging unit on Stallcup #45 and conduct the pre-job wellhead radiation survey.
  3. Attach Cardinal Surveys Injection Profile tool string which consists of a Rope Socket (1.25" x 15" with a 5/8" fishing neck), Caliper (1.375" x 69"), Collar Locator (1.375" x 28.5"), Scintillation Gammaray Detector (1.375" x 60"), Microprocessor Controlled Ejector (1.375" x 75.5") with UV I-131 as the tracer isotope, and a Temperature Tool (1.375" x 37").
  4. Install wireline blow out preventor and tool trap.
  5. Install lubricator and test for leaks.
  6. RIH with Injection Profile tool string into the tubing.
  7. Check well for stable injection rate and pressure.
  8. Run Injection Temperature and CCL Logs from 5,500 to 6,100.
  9. Run Gamma Ray and Collar Logs from 6,100 to 5,500. Correlate Gammaray and CCL logs to supplied correlation log. Adjust depth measurement from Wireline Depth to Measured Depth.
  10. Return Injection Profile logging string to T.D. at 6,100 and run Caliper Log from 6,100 to 5,500.
  11. Intensity Profile: Place Injection Profile logging string above the zone of interest 5700 - 6000 and eject Slug #1 of UV I-131. As the slug travels down hole with the flow, attempt 3 passes through the UV I-131 with the recorder set to depth drive before the first point of loss. This will allow for a 100% intensity reading. Note the delta times from peak to peak.
  12. Continue to make timed passes through Slug #1 until it has dissipated.
  13. Velocity Profile: Eject Slug #2 of UV I-131 below the zone 5700 - 6000 and above T.D. at 6,100. Eject the slug as low as possible if there is no rathole. Place the recorder in 2" Time Drive. Wait 3 - 5 minutes for the UV I-131 slug to travel down to the detector.
  14. After the UV I-131 has reached the detector, or the 5 minute waiting period has expired, Make a single pass through Slug #2 (recorder in depth drive) to determine if there was a slug ejected and whether the reaction time (if any) was caused by fluid movement or simple dispersion of material. Slug #2 is referred to as the No-Flow Shot. It helps determine if there is any injection going below T.D. in the wellbore.
  15. Break down the areas of loss in the zone from 5700 - 6000 by ejecting slugs of UV I-131 between areas of interest while the tool string is stationary and the recorder is in 2" time drive.

    Note: Refer to the Caliper Log so as not to shoot any velocity shots across drastic I.D. changes.

  16. Upward Channel Check: Place the gamma ray detector approximately 5 feet above the zone 5700 - 6000 and eject the upward channel check slug. Remain stationary with recorder in 2" Time Drive and monitor slug going past the detector to the zone at 5700 - 6000. Monitor for gamma ray returns for 5 minutes. If gamma ray returns are seen, raise the detector in 5 feet increments to follow channel. If no returns are seen, switch to depth drive and pull a gamma ray log above top of zone in order to check for returns that might have passed outside the detector's range.
  17. Eject at least three 100 percent velocity shots above all points of loss so that an average rate may be determined for the Velocity Profile.
  18. Raise the logging string up to 5,500 and shut off the injection.
  19. Allow well to remain static for approximately one hour.
  20. Run a Shut-in Temperature Log from 5,500 to 6,100.
  21. Cross Flow Checks, Shoot a series of UV I-131 slugs approximately 50 feet apart across the zone 5700 - 6000 and make timed passes through all the slugs at the same time to determine if there is any cross flow between zones.
  22. Run a Shut-in Temperature Log from 5,500 to 6,100 approximately 2 hours after the well has been shut-in.
  23. POOH with Cardinal Survey's logging tool string.
  24. Rig down equipment, return well to injecting status, and conduct the post job wellhead radiation survey.
  25. Contact the Your Company, Inc. field representative to give preliminary results and the current status of Stallcup #45.

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