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 t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] In the case of slow stirring, for example, at 60 rpm, add 98% (weight ratio) concentrated sulfuric acid to the sludge produced by 800 grams of ternary compound flooding sewage treatment while stirring, and detect the mixed solution of sludge and concentrated sulfuric acid. 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 in the sludge and the water layer will form the upper separation liquid and the lower 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 stand for 3 minutes, filter, the filtered liquid is the washing liquid, and the washing liquid and the separation liquid are mixed together, and it can be recovered after standing for 5 minutes. Crude oil is precipitated on the liquid su...

Example Embodiment

[0026] Example 2

[0027] In the case of slow stirring, add 28% (weight ratio) industrial waste hydrochloric acid to the sludge produced by 800 grams of ternary compound flooding sewage treatment while stirring, and detect the pH value of the mixed solution of sludge and concentrated sulfuric acid. When it is 0.8, stop adding waste hydrochloric acid, stop stirring, let 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 remove the washing liquid It is mixed with the separated liquid filtered or poured out before, and after standing for 5 minutes, the crude oil precipitated on the liquid surface can be recovered. The remaining mixed liquid after the recovery of crude oil contains a coagulant, which can be used as a coagulant solution to continue. use. The residual sludge filter residue after washing will be further processed.

[0028] The embodiment of p...

Example Embodiment

[0033] Example 3

[0034]1. Dry the sludge filter residue and pulverize 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 is 8.2. After stirring evenly, nitrogen is passed through the mixture to remove dissolved oxygen, the reaction temperature is controlled at 20-40 °C, and 0.6 g of 2% methylidene bisacrylamide solution and 0.6 g of 3% ammonium persulfate are added. , stir evenly and place into glue, then crush, dry and crush.

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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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