Wellbore soaking has been successfully applied to remove damage in oil and gas wells. The damage (paraffin, asphaltene, scale and other damage) is effectively removed by soaking the wellbore with mud acid, aromatic solvents or other chemicals depending on the type of damage. Majority of the damage that has been observed in geothermal injection wells comes from the deposition of silica causing the decline in their injection capacities. The damage may form in and away from the wellbore and in the surface injection lines.

This paper discusses the application of wellbore soaking prior to the main acid treatment in two of the injection wells in the Botong sector of the Bacon-Manito Geothermal Production Field, Philippines. Results of the acid treatment showed significant improvement in injection capacities compared to previous acid treatment of injection wells without soaking the wellbore.

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