Evaluation of Thermodynamics effect on Mineral Scale Formation in Water Injection Wells; Supported by Laboratory Experiments

Document Type : Research Article

Authors

1 Chemical Engineering Department, Amirkabir University of Technology, Tehran, Iran

2 Chemical engineering department, Amirkabir university of technology, Tehran, Iran

10.22060/ajme.2021.18473.5900

Abstract

Usually some amount of unwanted water is producing along with oil production in most of the oil fields. Usually these waters are useless and dangerous to environment and must be managed safely. In most of the cases, they are injected to water disposal wells. Scale formation and well plugging during water injection to disposal wells, is a critical field problem in waste water management. The most important reasons of inorganic scale formation in these wells are: I. Incompatibilities of injection water and reservoir water, and II. Thermodynamics condition variation of injection water. These mechanisms lead to the mineral scales precipitation and consequently they would be deposited in porous media and leads to injection rate reduction in water disposal wells.
The critical place of scale formation is the bottom of the well where is the entrance of injected fluids and commonly results the increase of injection pressure along with reduction of water injection rate.
In current study, the effect of pressure and temperature would be assessed on precipitation of inorganic scale by lab testing and software simulation at different mixing ratio of injection water to formation water. And also some core flooding tests would be run to evaluate the effect of the deposited mineral scales on water injection process in the core samples.

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