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World Journal of Engineering
Research and Technology

( An ISO 9001:2015 Certified International Journal )

An International Peer Reviewed Journal for Engineering Research and Technology

ISSN 2454-695X

Impact Factor : 5.924

ICV : 79.45

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Dankwa, O. K.,* Appah, D., Joel, O. F. and Asiam, E. K


In this study, mathematical models have been generated for the prediction of time of separation (compatibility) for four matrix acidizing fluids in contact with reservoir fluids. The treatment fluids formulated are used for the removal of wellbore damages due to organic and inorganic materials, fines, mudcake, etc. The study determined the viscosity and the behaviour of the acidizing fluids in contact with the formation fluids as well as the time it takes for separation. The treatment fluids are: clay stabilisation fluid, matrix stimulation, oil-based dispersant fluid and non-retarded mud acid systems. The rheological and the separation time analyses were conducted at temperatures of 80 °F, 150 °F and 190 °F. Generally, rheological values were affected by temperatures; increase in temperature decreased the values in most cases with the exception of oil-based dispersant fluid. Clay stabilisation and matrix stimulation fluids recorded low separation times at all test temperatures which proved compatibility. Again oil-based dispersant fluid could not separate out of the crude within the test time of 10 minutes at all test temperatures. Low viscosity values are desirable so that acid treatment fluid can easily be flowed out of the wellbore after stimulation operation and also to avoid the occurrence of adverse effects such as precipitating out. The model equations generated can be used to determine the fluid – crude compatibility when the viscosity of fluid and the working formation temperatures are known.

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