Biological treatment method of oilfield drilling waste

A drilling waste and biological treatment technology, which is applied in biological sludge treatment, sludge treatment, aerobic and anaerobic process treatment, etc., can solve the problems of limited degradation effect, long time required for biological treatment, difficult biodegradation, etc. , to achieve the effect of low treatment cost, favorable heat preservation and enhanced biological treatment

Active Publication Date: 2011-06-29
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some defects in the existing microbial method, for example: when the oil content in the drilling waste is high, the biological treatment takes a long time
Microorganisms have limited degradation effects on organic compounds with polycyclic complex structures such as long-chain hydrocarbons and heterocyclic aromatic hydrocarbons with branched chain structures, and some are even difficult to biodegrade

Method used

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  • Biological treatment method of oilfield drilling waste
  • Biological treatment method of oilfield drilling waste
  • Biological treatment method of oilfield drilling waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) 45g of drilling waste (water content of 67.23%; dry sample containing 60.56% ash, 32.91% volatile solids, and 2.14% fixed carbon) from Pinghu Bajiaoting No. B01 well was mixed with 100mL of water Mix in a glass container, and add nitrogen, phosphorus, magnesium and iron nutrient salts according to the weight ratio of COD:N:P:Mg:Fe=100:5:1:0.05:0.05, to prepare drilling waste mud solution for domestication;

[0034] (2) Get 2L of activated sludge (MLSS=5.0g / L) from the sewage treatment system of Shanghai Water Purification Plant to domesticate in the laboratory sequencing batch reactor (SBR), and the effective volume of SBR is 2L;

[0035] In the acclimatization stage, the designed COD of SBR is 500mg / L, which is jointly provided by glucose and diesel oil or drilling waste; during the operation of the SBR process, a timer is used to control the aeration / stirring / heating time.

[0036] In the first domestication stage, commercially available 0# diesel was used and glu...

Embodiment 2

[0048] (1) Add 0.16g K 2 HPO 4 , 0.08g NaH 2 PO 4 , 0.04g anhydrous MgSO 4 , 0.02g anhydrous CaCl 2 , 0.04g NaCl and 0.4g NH 4 Cl was uniformly dissolved in 200ml of water, and sterilized in a sterilizing pot at 110°C for 2 hours, then cooled to room temperature to obtain an inorganic salt-enriched medium, which was stored in a refrigerator;

[0049] In the above-mentioned inorganic salt-enriched medium with a culture system of 50 ml, inoculate commercially available strains of Pseudomonas and Micrococcus at a ratio of 5% of the volume of the culture system, shake the flask at 30°C and 120rpm Cultured for 3 days. The enriched bacterial solution containing Pseudomonas and Micrococcus was stored at a low temperature at 4°C;

[0050] (3) 5 kilograms of drilling waste taken from Pinghu Bajiaoting No. B01 well and 5L water are mixed in the pretreatment tank to form a mud solution to be treated;

[0051] (4) Adopt JJ-1 precision booster electric agitator, with the stirring s...

Embodiment 3

[0057] (1) Add 0.16g K 2 HPO 4 , 0.08g NaH 2 PO 4 , 0.04g anhydrous MgSO 4 , 0.02g anhydrous CaCl 2 , 0.04g NaCl and 0.4g NH 4 Cl was uniformly dissolved in 200ml of water, and sterilized in a sterilizing pot at 110°C for 2 hours, then cooled to room temperature to obtain an inorganic salt-enriched medium, which was stored in a refrigerator;

[0058] In the above-mentioned inorganic salt-enriched medium with a culture system of 100ml, inoculate commercially available Achromobacter, Chromohalobacter and Halomonas bacterial strains at a ratio of 5% of the system volume, at 30°C, Shake flasks were cultured at 120rpm for 3 days. The enriched bacterial solution containing Achromobacter, Chromohalobacter and Halomonas was stored at a low temperature of 4°C;

[0059] (3) 2 kilograms of drilling waste taken from Pinghu Bajiaoting No. B01 well and 5L water are mixed in the pretreatment tank to form a mud solution to be treated;

[0060] (4) Adopt JJ-1 precision booster electric...

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Abstract

The invention relates to a biological treatment method of oilfield drilling waste. Specifically, microorganisms are utilized to degrade hydrocarbons pollutants in the drilling waste, so as to treat the oilfield drilling waste.

Description

technical field [0001] The invention relates to a biological treatment method for oil field drilling waste. More specifically, the present invention relates to the treatment of oilfield drilling waste by using microorganisms to degrade hydrocarbon pollutants in the drilling waste. Background technique [0002] Drilling fluid is a very important substance in oil drilling operations and is widely used in oil drilling. Since the drilling fluid system is a complex multi-phase dispersion system containing a variety of inorganic substances, organic substances and solid particles, a large amount of formation drilling cuttings will be brought in after drilling operations and mixed with crude oil, so the waste drilling fluid is muddy and It is called waste drilling mud, some of which contain substances harmful to the environment, long-term stacking will complicate the chemical composition of waste drilling mud, and then form a kind of waste drilling mud composed of clay, weighting m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F3/30
CPCY02W10/20
Inventor 鲁军朱战兵牟伯中刘自明莫成孝刘金峰项先忠杨世忠刘志东周彦波杨丞磊
Owner CHINA NAT OFFSHORE OIL CORP
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