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Comprehensive utilization method for sludge generated in ASP flooding sewage treatment process

A ternary compound, sewage treatment technology, applied in water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, sludge treatment, etc. Good performance and avoid environmental pollution

Inactive Publication Date: 2011-06-15
DAQING DAFENG OILFIELD TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, using the existing methods to treat the sludge generated in the process of ASP flooding sewage treatment has not achieved satisfactory results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the case of slow stirring, for example, 60 revs per minute, add 98% (weight ratio) concentrated sulfuric acid while stirring in the produced sludge of 800 grams of three-way compound flooding sewage treatment, detect the concentration of sludge and concentrated sulfuric acid mixed solution pH value, when the pH value is 0.7, stop adding concentrated sulfuric acid, stop stirring, and let it stand for about 3 minutes, the solid impurities and water in the sludge will separate into layers to form the upper part of the separation liquid and the lower part of the sludge filter residue. The separation liquid in the upper layer is separated from the sludge filter residue by filtering or pouring out. Add 80 grams of tap water to the sludge filter residue, stir for 3 minutes, let it stand for 3 minutes, filter, the filtered liquid is the washing liquid, and mix the washing liquid and the separation liquid together, and after standing for 5 minutes, it can be recovered Crude o...

Embodiment 2

[0027] In the case of slow stirring, add 28% (weight ratio) industrial waste hydrochloric acid while stirring in 800 grams of the sludge produced by the three-way compound flooding sewage treatment, detect the pH value of the mixed solution of sludge and concentrated sulfuric acid, when the pH value When it is 0.8, stop adding waste hydrochloric acid, stop stirring, let it stand for about 3 minutes, filter or pour out the liquid, then add 80 grams of tap water to the sludge filter residue, stir for 3 minutes, let stand for 3 minutes, filter, and wash the liquid Mix with the previously filtered or poured separation liquid, and after standing for 5 minutes, the crude oil precipitated on the liquid surface can be recovered, and the remaining mixed liquid after recovering the crude oil contains coagulant, which can be used as a coagulant solution to continue use. The remaining sludge filter residue after washing will be further processed.

[0028] Example of preparing body-expand...

Embodiment 3

[0034]1. Dry the sludge filter residue and crush it for use. 2. Mix 20 grams of acrylamide, 4 grams of acrylic acid and 30 grams of water evenly, add 10 grams of dried and pulverized sludge filter residue, add 10 grams of bentonite after stirring, and add 15% sodium carbonate solution after stirring to control the reaction mixture The pH value of the solution is 8.2. After stirring evenly, pass nitrogen into the mixture to remove dissolved oxygen, control the reaction temperature at 20-40°C, add 0.6 grams of 2% methylenebisacrylamide solution, and 0.6 grams of 3% ammonium persulfate , Stir evenly, place it into a gel, then break it, dry it, and crush it.

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PUM

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Abstract

The invention discloses a comprehensive utilization method for sludge generated in an ASP flooding sewage treatment process, comprising the following steps of: adding inorganic acid in the sludge generated in the ASP flooding sewage treatment process, stirring and filtering, wherein the filtrate from which little crude oil is recycled can continue to serve as coagulant; and then, drying sludge residue, crushing the dried residue to have needed granularity, and then using the crushed material as raw material for preparing swellable particle profile control agent. Mass ratio of main reactants for preparing the swellable particle profile control agent is as follows: acrylic amide: acrylic acid: the sludge: bentonite: 2% methylenebiacrylamide: 3% persulfate = 10-25: 2-4: 5-12: 5-12: 0.3-1.0: 0.3-1.0; by the comprehensive utilization of the sludge generated in the ASP flooding sewage treatment process, the harmless and resource-oriented treatment on the sludge generated by the ASP flooding is implemented, the obtained coagulant can be used for the ASP flooding sewage treatment, and the prepared swellable particle profile control agent has the characteristics of excellent temperature tolerance, salinity tolerance, suspension property and expansibility, and the like.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of sludge produced in the sewage treatment process of three-element compound flooding in oil fields. Background technique [0002] ASP flooding refers to a new technology of tertiary oil recovery that prepares surfactant-alkali-polymer three types of chemical substances according to a certain mass ratio into a dilute aqueous solution and injects it into the formation as a displacement fluid to achieve the purpose of enhancing oil recovery and increasing yield. At present, in oil field production, the sewage produced by ASP flooding has been purified by adding chemical agents. After purification, the water quality is qualified, but a large amount of sludge will be produced during the purification process, and this The nature of this kind of sludge is quite special: usually, sludge contains about 90% water, about 0.7% crude oil and about 10% solid matter. Among them, the solid matter is mai...

Claims

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Application Information

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IPC IPC(8): B09B3/00C02F1/52C02F11/00C09K8/42
Inventor 张庆生吴凤悟刘兴玉
Owner DAQING DAFENG OILFIELD TECH
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