In-situ microbial oxygen generation and hydrocarbon conversion in a hydrocarbon containing formation

a hydrocarbon containing, in-situ oxygen technology, applied in the direction of fermentation, fluid removal, borehole/well accessories, etc., can solve the problems of hampered utilization of microorganisms to enhance hydrocarbon recovery, and achieve enhanced hydrocarbon recovery, improved quality, and enhanced bioavailability and biodegradability

Inactive Publication Date: 2012-10-11
SHELL OIL CO
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Benefits of technology

[0042]The method according to the invention generates oxygen in-situ that will enhance bioavailability and biodegradability, which subsequently will enable enhanced recovery of hydrocarbons (of improved quality) via other process like Microbial Enhanced Oil Recovery (MEOR), Microbial Enhanced Coalbed Methane (MECBM) or pretreatment of h

Problems solved by technology

Utilization of microbes to enhance hydrocarbon recovery is hampered by the limited bi

Method used

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  • In-situ microbial oxygen generation and hydrocarbon conversion in a hydrocarbon containing formation

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[0050]A suitable embodiment of the method according to the invention, comprises the following steps:

a) Screening whether a target underground crude oil and / or natural gas containing reservoir formation has features, such as temperature, salinity, heterogeneity, oil characteristics, micro-organisms, volatile fatty acids, hydrogen ions, acetate, propionate or butyrate and / or other potential electron donors, etc., which allow use of the method according to the invention;

b) Analyzing the composition of the water, oil and / or natural gas in the formation, for example by screening a sample taken from the formation;

c) Identification of potentially interesting micro-organisms with molecular DNA technologies using either general (16S rRNA-related) primer sets or enzyme / functional group specific primer sets (nitrate / nitrite-reductase, (per)chlorate reductases, chlorite dismutase, or hydrocarbon (alkane) degrading enzymes or using metagenomics;

d) Isolation of potentially interesting indigenous ...

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Abstract

A method for in-situ microbial oxygen generation in an underground hydrocarbon containing formation comprises: injecting into the formation an oxygen generating composition comprising thermophilic chlorate reducing micro-organisms, such as bacteria of the genus Archaeoglobus, Geobacillus and/or Thermus, which multiply at a temperature of at least 60° C.; and inducing the multiplied micro-organisms to convert the hydrocarbons and/or other pore fluid components in-situ into transportable or disposable products

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a method for in-situ oxygen generation in a hydrocarbon containing formation.[0002]Such a method is known from U.S. Pat. No. 5,163,510.The method known from this prior art reference comprises:[0003]injecting into the formation a fluid comprising a source of oxygen that chemically releases oxygen into the formation;[0004]inducing micro-organisms present in the formation to multiply using the oil as their carbon source and the chemically produced oxygen in the injection water as their oxygen source; and[0005]allowing the multiplied micro-organisms to convert oil from the environment.[0006]In this known method the source of oxygen is provided by injecting water comprising an oxidizing compound selected from the group consisting of H2O2, NaClO3, KClO4, NaNO3 and combinations thereof, which are assumed to be chemically converted to result in oxygen. This assumption is based on the fact that oxygen generation from Microbial Chlorat...

Claims

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Application Information

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IPC IPC(8): E21B43/22
CPCC09K8/582C12P3/00C12P1/04C09K8/592C09K8/60
Inventor LOMANS, BARTHOLOMEUS PETRUS
Owner SHELL OIL CO
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