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Method and preventing and reducing hydrogen sulfide of aqueous system and promoting oil recovery factor

A water system, hydrogen sulfide technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc.

Active Publication Date: 2009-01-07
ADVANCED ENERGY & ENVIRONMENTAL TECH INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the method must also prevent further hydrogen sulfide production by sulfate-reducing bacteria

Method used

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  • Method and preventing and reducing hydrogen sulfide of aqueous system and promoting oil recovery factor
  • Method and preventing and reducing hydrogen sulfide of aqueous system and promoting oil recovery factor
  • Method and preventing and reducing hydrogen sulfide of aqueous system and promoting oil recovery factor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] The data in the following tables are obtained from laboratory reaction vial tests. A series of sterile sulfate-reducing bacteria synthetic medium test bottles were inoculated with constant numbers of microorganisms, ie, constant numbers of sulfate-reducing bacteria and denitrifying microorganisms. Add different concentrations of chemicals to be tested in different test bottles (samples). The growth of SRB is judged by the formation of sulfide, in other words, the absence of SRB growth can be judged by the absence of sulfide formation. These results are shown in the table below.

[0055] sample number

Nitrate ion concentration

degree(PPM)

Nitrite ion

Concentration (PPM)

molybdate ion concentration

degree(PPM)

sulfate reducing bacteria

growth

1

500

No

2

200

Have

3

100

Have

4

500

No

5

200

Have

...

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PUM

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Abstract

The present invention provides a method for preventing and reducing sulfureted hydrogen in an aqueous system. The method not only can remove the sulfureted hydrogen in the aqueous system but also can effectively restrain sulfate reducing bacteria (SRB) from producing the sulfureted hydrogen by adding nitrate ion and / or nitrite ion. Nitrite and denitrifying microorganism can remove the sulfureted hydrogen in the aqueous system. Relative to the sulfate reducing bacteria (SRB), the denitrifying microorganism can more effectively use the prior carbon source and avoid the sulfate reducing bacteria(SRB) to produce the sulfureted hydrogen further. The present invention also provides a method for improving petroleum recovery ratio. An aqueous system that the sulfureted hydrogen is basically removed and the denitrifying microorganism exists is used for improving the petroleum recovery ratio by a microorganism oil increment system.

Description

technical field [0001] The invention relates to a method for reducing the content of hydrogen sulfide in an aqueous system, especially an oilfield aqueous system, and an effective method for preventing hydrogen sulfide production in an aqueous system. The present invention relates to methods of enhancing oil recovery using aqueous systems free of hydrogen sulfide or less likely to be contaminated with hydrogen sulfide. The present invention also relates to methods for realizing microbial oil recovery using these methods. Background technique [0002] Oil is collected after being transported to the surface by one or more wells drilled through subterranean oil-bearing rock formations. If enough pressure exists in an oil-bearing formation underground, the oil will spontaneously spill from the surface without the need for pumps. Typically, as an oil field is produced, the pressure in the formation gradually decreases and pumps will then be required to produce it. [0003] Cur...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 何志东
Owner ADVANCED ENERGY & ENVIRONMENTAL TECH INC
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