Ωmega Products

Shallow Production Solutions, Inc now offers specialized products to Improve Oil Recovery (IOR) in mature fields as well as post production applications.

 

Understanding the problem of Paraffin and Asphaltene Deposition.

Paraffin and asphaltene problems vary from area to area, from field to field in the same area, and sometimes from well to well in the same field. This makes it impossible to have one universally effective solution.  The effects of paraffin and asphaltene (tar) deposition, however, are universal.  Deposits in the wellbore, feedlines, and, in the case of asphaltenes, sometimes in the formation, gradually choke production.  Unless removed, deposits will eventually stop oil flow.  Usually, asphaltenes form part of the paraffin deposit, complicating removal problems.

 

Paraffin Deposits

Paraffin precipitates out of waxy crudes when there is a slight change in equilibrium conditions, causing a loss of solubility of the wax in the crude. A lowering in temperature is the most common cause of paraffin precipitation, though many other factors can affect the process.


Evidence indicates that suspended particulate matter – such as asphaltenes, formation fines, corrosion products, silt and sand – speeds precipitation. The particulates act as a nucleus for the cohesion of small wax particles into larger particles, which tend to separate more readily from the oil. Even though the wax may separate from the crude, it can often remain in suspension in the crude and not deposit when the oil is flowing.

Waxy crude will probably result in deposition when produced under one of the following conditions:

  • Alternately coating the pipe, then draining the oil, leaving a thin coating on the pipe. Movement of this oil coating is too slow to prevent deposition.
  • Contact with an unusually cold surface, such asa production through aquifers, causes paraffin crystals to grow directly on the pipe wall.
  • Pipe surfaces are rough, providing excellent sites for paraffin deposition.
  • Electrical charges on various materials in the crude promote migration of separated waxes to the pipe wall.

 

Asphaltene Deposits

Tars or asphaltenes occur in many crudes as colloidally suspended solid particles. Precipitation takes place when the crude loses its ability to keep those particles dispersed.
Many of the same factors affecting paraffin deposition also affect asphaltene deposition.

Asphaltenes, however, usually occur at the bottom of the well adjacent to the producing formation wall. In some cases, the asphaltenes precipitate within the formation, creating a damage removal problem.

 

Paraffin and Asphaltene Control

Paraffin and Asphaltene Deposits are a leading cause of decreased production and the creation of expensive mechanical problems.  The Ωmega Production System is very effective in preventing the build up of Paraffin within the tubing string, however, problems can still occur in flow lines and storage tanks.  In areas experiencing high Asphaltene Deposits at the bottom of the well and clogging the perforations, an effective treatment is necessary.

 

IOR Products and Post-production Applications.

 

Login

Search