Skip to main content
padlock icon - secure page this page is secure

Experimental Investigation of Acid-induced Sludge Precipitation: Using Acid Additives in Iran

Buy Article:

$61.00 + tax (Refund Policy)

Dilute hydrochloric and hydrofluoric acid are used in the fracturing and acidizing of compact oil formations to dissolve the undesirable carbonate and silica deposits or scales, which interfere with the passage of oil in tubing or in the formation itself. A typical acid formulation is based on 15% hydrochloric for carbonate reservoirs and 12/3 wt% hydrochloric/hydrofluoric (regular mud acid) for sandstone reservoirs. But higher acid strengths are also used. Contact of acid with the crude oil generates a precipitate known as acid-induced sludge. Acid-induced sludge is becoming an increasing cause of oil well stimulation treatment failure. Acid stimulation experimental tests were conducted on the Marun crude oil sample from the Marun oil field for quantifying the amount of sludge precipitation as a consequence of an acidizing job. The potential of sludge precipitation by acid additives, such as iron ion concentration, standard dosage of mutual solvent, corrosion inhibitor, corrosion aid, suspended agent, and surfactant of the Marun crude oil sample, were experimentally investigated. The results show that, by increasing the concentration of acid and iron ion, the potential of sludge precipitation increases. The threshold of acid concentration for serious sludge precipitation is 17% for hydrochloric and 12/3% for mud acid. Iron ions promote the sludge precipitation. A 7,500-ppm iron ion is confirmed to be the threshold for serious acid-induced sludge. The standard dosage of all additives used in the current study (additives were prepared from Iranian Cymanband Company) was found to cause sludge precipitation.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: acidizing additives; corrosion aid; corrosion inhibitor; iron control agent; mutual solvent; regular mud acid; sludge; suspended agent

Document Type: Research Article

Affiliations: Petroleum University of Technology, Abadan Faculty of Petroleum Engineering, Abadan, Iran

Publication date: August 18, 2014

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more