Rig-site handling of high-density brines. Part 3
Most water sources used in oil well servicing contain a significant amount of dissolved oxygen. An oxygen scavenger is mixed with these waters to react with oxygen before it can react with steel surfaces. Oxygen corrosion will occur in brines with densities of 12 lb/gal or less. In the higher-density brines, acid corrosion predominates since very little oxygen can dissolve in brines containing such high concentrations of dissolved salts (greater than 40% total salt concentration). In some cases, the oxygen present results in increased formation plugging from iron oxide corrosion products (rust), when an iron source is available (formation, surface equipment and tubulars). Oxygen corrosion can be minimized by painting the inside of tanks, avoiding air entrainment (jetting or agitation), and using oxygen scavengers. Oxygen scavengers are depleted as they react with the oxygen in solution. However, since there should always be an excess of oxygen scavenger present, continuous treatment is necessary.
- OSTI ID:
- 6320025
- Journal Information:
- Well Serv.; (), Journal Name: Well Serv.; () Vol. 24:2
- Country of Publication:
- United States
- Language:
- English
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