Stripping and Stripping-Out Procedures

Stripping Procedures

  1. Read and record SIDPP & SICP
  2. Calculate and record the length of each stand of pipe standing back.
  3. Calculate and record the volume of each stand (displacement + displacement).
  4. Reduce closing pressure on the annular to reduce the closing force on the pipe. The closing pressure might have to be reduced to (zero) 0 psi to allowing stripping without damaging the rubber element.
  5. Slowly strip pipe into the hole and open the choke.
  6. Fill each stand of drill pipe with mud thus eliminating any trapped air.
  7. Adjust the choke to maintain a pressure of SICP + 50 psi while stripping each stand slowing down for the tool joint to pass through the annular rubber.
  8. Use Base Oil to lubricate the rubber element.
  9. Reduce the stripping speed on the last 3 meters of the stand.
  10. Start closing the choke, while maintain backpressure, within the last 3 meters of the stand.
  11. Maintain a constant SICP until the stand is run and close choke.
  12. Record the trip tank level and the SICP.
  13. Bleed off any excess mud volume equal to the pipe displacement + capacity
  14. Strip in 10 stands.
  15. Read and record the SIDPP & SICP.
  16. Bring well on choke holding the casing pressure constant.
  17. Read and record the Circulating Drill Pipe Pressure.
  18. Circulate while holding the Circulating Drill Pressure constant for at least one bottoms up or until gas levels fall back to 0%.
  19. Repeat steps 5-17, stopping and circulating every 10 stands until reaching the 9-5/8” casing shoe.
  20. After circulating on the choke at the shoe and annulus mud is cleaned up, proceed to strip into the hole stopping and circulating very 10 stands.
  21. If the volume of gas at surface is excessive for a single circulation, reduce the stands stripped between circulations to 5 stands.
  22. Continue to strip and circulate until reaching bottom.

Stripping Out Procedures

The following procedures are to ensure that additional influx is not allowed into the wellbore during the stripping operations. Volumes of fluids must be monitored to ensure that the volume of volume of steel and the pipe’s internal capacity is replaced with mud.

  1. Pressure test the choke manifold with the cementing unit to 2000 psi. Read and record the pressure for the three different gauges. Compare these pressures to the pressure applied by BJ. Eliminate the use or replace any gauge that is not functioning correctly.
  2. Align cement unit to pump through the kill line, across the BOP and through the choke manifold. Ensure that spare choke plates/stem & seats are available on the rig.
  3. Prepare to strip out of the hole with the drill string.
  4. Open the choke and check for trapped pressure. Bleed off small volumes at a time, i.e. 1/8 bbl. Record all pressure. When the SICP stabilizes at a constant pressure, record as the true SICP. Always assume that trapped pressure exists.
  5. Open the kill line valve.
  6. Begin pumping with the cementing unit and open the choke to maintain constant casing pressure.
  7. Bring the pump rate up to 1 bpm pump rate while maintaining a constant casing pressure measure at the choke manifold.
  8. Adjust the Circulating Casing Pressure to 50 psi higher than the recorded SICP.
  9. Begin stripping operations.
  10. Continue to strip until the last installed IBOP is at surface.
  11. Call the office for discussions at the time.

 

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