Oil field re-injection water microbiological treatment

A technology for microbial treatment and oilfield reinjection water, applied in the direction of sustainable biological treatment, biological water/sewage treatment, multi-stage water/sewage treatment, etc. Issues such as oil removal effect are disclosed to achieve stable treatment effect, reduced backwashing frequency, and good synergistic effect

Active Publication Date: 2008-03-26
JIANGSU BODA ENVIRONMENTAL PROTECTION
View PDF5 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly uses physical and chemical treatment as pretreatment. Not only is the treatment process long, the process is complicated, the floor area is large, the investment is high, the maintenance workload is heavy, and the operating cost is high. It is also difficult to stably meet the reinjection water standard.
[0008] It can be seen from the above that at present, various improved physical and chemical methods are basically used for the treatment of oilfield produced water, and it is difficult to stably treat them to the standard of reinjection water.
[0009] In the 4th issue of "China Water Supply and Drainage" in 2003, the "biochemical method for treating high-temperature and high-salt oilfield produced water" disclosed that although it proposed to treat oilfield produced water with microorganisms (undisclosed specific microbial strains) contact oxidation combined with precipitat

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Oil field re-injection water microbiological treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: according to Fig. 2 processing flow, processing result is shown in Table 2

[0029] Table 2 Example 1 treated effluent unit mg / L

[0030] project

[0031] Explanation: The water inflow of Comparative Example 1 and Example 1 is the same water from a settling tank in an oil field, pH8.2, T38℃, water volume: 5m 3 / H, degree of salinity: 25000mg / L, polymer: 275mg / L, the process of Comparative Example 1 was adopted before the transformation, and the process of Example 1 of the present invention was adopted after the transformation, and the original sterilization, quartz sand filter and magnetite filter were retained Only the original coagulation and demulsification, flotation, walnut shell filtration, and use Bacillus cereus, Corynebacterium sp., Bacillus subtilis, alkagenes Bacteria (Pseudomonas alcaligenes), Pseudomonas stutzeri (Pseudomonas stutzeri), Bacillus licheniformis (Bacillus licheniformis) joint bacteria contact oxidation (semi-soft fill...

Embodiment 2

[0035] Embodiment 2: according to Fig. 4 processing flow, processing sees Table 4.

[0036] Table 4 Example 2 treated effluent unit mg / L

[0037] project

Water out of the settling tank

Precipitation separated out

water

Fine filtered water

average removal rate

Oil

226

2.2

0.3

99.9％

SS

165

30

1.8

98.9％

median particle size

≤0.82μm

Saprophytes

≥10 6 pcs / ml

≤10 / mL

99.99％

SBR

≥10 6 pcs / ml

not detected

100

TGB

≥10 6 pcs / ml

≤10 / mL

99.99％

Dual Material Filter Cleaning Cycle

Wash every 10 days

Fine filter cleaning cycle

After more than half a year of operation, it still maintains good effluent quality

[0038] Explanation: The water inflow of Comparative Example 2 and Example 2 is the water outflow from the same oilfield settling tank, pH7.2, T35℃, water volume: 5m 3 / H, salin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The improved process of treating oil field effluent for reinjection features aerobic biochemical treatment and subsequent filtering. The microbes for the aerobic biochemical treatment include Bacillus cereus, Corynebacterium, Bacillus subtilis and Pseudomonas alcaligenes, and the inflow water has pH value controlled in 6-9. The process can reach oil field water injection standard, including oil not more than 2 mg/l, SS not more than 1 mg/l and grain size mid value not greater than 1 micron. The present invention has the advantages of simple technological process, low cost, stable treating effect, no secondary pollution, etc., and is especially suitable for use in oil field.

Description

technical field [0001] The invention relates to the improvement of the oilfield produced water treatment reinjection method, in particular to an oilfield reinjection water treatment process which adopts obligate microorganisms combined with flora biological treatment and combines physical filtration treatment. Background technique [0002] Oil extraction is accompanied by a large amount of produced water. For example, in 2005, my country's crude oil output was 181.5 million tons, which produced more than 900 million tons of produced water. However, the oil production process requires a large amount of water to be re-injected into the formation to save water resources. At least 90% of the produced water is required. % above for re-injection. The oilfield produced water has: high oil content, up to 200-1000mg / l; complex composition, in addition to crude oil, it also contains fatty acids, surfactants, oil displacement agents, demulsifiers, viscosity reducers, corrosion inhibitor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/14C02F3/02C02F3/34C12N1/20
CPCY02W10/10
Inventor 王娅娜王海君
Owner JIANGSU BODA ENVIRONMENTAL PROTECTION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap