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Wellbore Clean-up Method

IP.com Disclosure Number: IPCOM000236444D
Publication Date: 2014-Apr-25
Document File: 2 page(s) / 18K

Publishing Venue

The IP.com Prior Art Database

Related People

Baker Hughes Incorporated: OWNER

Abstract

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.

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Wellbore Clean-up Method

Abstract

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.

Description of the Invention

After finishing the drilling operation with oil based drilling fluid, the oil based fluid would be displaced to brine or to brine containing a mixture of microbes capable of degrading the oil in the filter cake. The microbes would be grown in a nutrient rich broth to generate a concentration that would be optimized to degrade the oil in the filter cake in the required time scale. Examples of microbes could include both anaerobic and aerobic species. One example may include members of the family desulfobacteriaceae. The destruction of oil based filter cake by microbes would be a good environmental solution reducing the need for using strong solvents or surfactants. The destructio...