Paraffin and asphaltenes can cause many types of problems depending upon the characteristics that they give to a particular crude oil. The problems can range from deposition of paraffin or asphaltenes in the formation or equipment, causing the oil to congeal, oil wetting of the formation, causing emulsions or rigid film emulsions during acid treatments. The analysis of crude oils from wells in Kentucky and Tennessee has been carried out to determine the possible organic problems that will affect the production from these wells. Problems, causes, and solutions will be discussed with case histories presented.

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