Friday, January 29, 2016

20. Quality Control.

1. Titrate the acid for strength. Refer to Table and Table for acceptable
limits.
2. Check the service company's load sheet to make sure that all the
additives are in the acid.
3. Agitate the acid on location prior to pumping to the well to ensure a
uniform acid blend.
4. Determine the maximum surface treating pressure allowable to prevent
fracturing of the formation.
5. Pressure test equipment to 5000 psi for 15 minutes
6. Maintain a constant injection rate during execution of the job. This will
allow real time or post job analysis of pressure data to be performed.
7. Do not allow the use of transports and pumps that are used for
anything other than acidizing services. This can lead to contamination
of the acid.
8. Conduct a safety meeting on location to ensure that everyone knows
what is to be done. Review all contingencies and safety procedures.
9. Take return acid samples each day until pH returns to that of the
formation brine. Have samples analyses for the following :
· pH.
· Acid strength.
· Surface tension.
· Amount, size and type of solids.
· Dissolved iron versus total iron.
· Presence of emulsions and organic sludges.
· Formation of precipitates.

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