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Wellbore Clean-up Method Disclosure Number: IPCOM000236444D
Publication Date: 2014-Apr-25

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A filter cake will form on the face of a permeable rock when drilling mud. To ensure successful production of hydrocarbons or for effective water injection it is essential that this filter cake is efficiently removed. The removal or disruption of the filter cake can be difficult when using non-aqueous drilling fluids. The proposition in this invention is to use a dispersion of thermophilic or hyperthermophilic bacteria to degrade the oil in the filter cake by a process of microbial oxidation. This would remove the oil from the filter cake and render it easily disrupted by flowing the well or injecting water. A secondary use could be in waste management with the processing of oil contaminated cuttings, slops or whole drilling mud disposal.