Data bases, computer modeling and lower job costs have become the focus of stimulation treatment design. This focus has directed the attention away from well specific fluid testing and formulations. Fluids and additives for non proppant applications are often assumed to have equal performance and are compared only for cost. The value of fracturing fluids is often based on rheological properties and viewed only as a means to transport proppant. This line of thinking ignores potentially serious compatibility consequences in oil reservoirs.

Oil is not inert. The compatibility of treating fluids can enhance or impede production. Cold fluids can precipitate damaging high melting point paraffin. Acid treatments without adequate iron control, surfactants and/or aromatic solvents will sludge some crudes. Diesel has been shown to precipitate asphaltenes in some circumstances. This paper discusses testing and evaluation methods beyond conventional emulsion testing for cost-effective performance enhancement. Guidelines for testing, evaluating and enhancing stimulation treatments are presented with case histories.

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