Water-based deoiling treatment method and device for oily sludge in oil field

A sludge water-based, oil treatment technology, applied in water/sludge/sewage treatment, sludge treatment, biological sludge treatment, etc., can solve the problems of long treatment cycle, slow biochemical degradation, complicated bacterial culture process, etc., to achieve Low operating cost and high oil removal rate

Active Publication Date: 2018-12-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology is easy to operate, has a long-lasting effect, and has no secondary pollution, but the treatment cycle is long
[0012] The shortcomings of the existing technology are: the biochemical degradation speed of the current oily sewage or sludge is slow, the degradation efficiency is low, and the bacterial cultivation process is complicated

Method used

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  • Water-based deoiling treatment method and device for oily sludge in oil field
  • Water-based deoiling treatment method and device for oily sludge in oil field

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Such as Figure 1-2 As shown, it is a water-based degreasing treatment device for oily sludge in an oil field, including a sludge conditioning tank 2, a water-based biochemical tank 7, a settling tank 9, and a centrifuge 12. The sludge conditioning tank 2 is equipped with an agitator 4 and heating rod 5, the upper part of the sludge conditioning tank 2 is provided with an oil receiving port 15 and a conditioning water inlet 1, and the sludge conditioning tank 2 is connected to the inlet of the water-based biochemical pool 7 through the liquid inlet pump 6, and the water-based biochemical An aeration pipe 10 is provided at the inner bottom of the tank 7; the settling tank 9 is arranged side by side with the water-based biochemical tank 7 and is separated by a partition 18; an overflow channel is provided on the top of the partition 18; Liquid outlet 16, sludge settling tank 9 is connected to the inlet of water-based biochemical tank 7 through return pump 11; The conditi...

Embodiment 2

[0039] Utilize the device of embodiment 1 to degrade the oily sludge in the oil field. Before the treatment, a biochemical system needs to be established in the water-based biochemical pool 7, which can be processed as follows:

[0040]In step (1), fill the water-based biochemical tank 7 with oilfield produced water, and add 10 mg / L soybean flour and 20 mg / L wheat bran at the same time. According to the COD condition of the water body, COD:N:P=100:5 :1 ratio to add the corresponding inorganic phosphate and inorganic ammonium salt. Add a compound degreasing agent with a mass ratio of 0.1%, and the number of viable bacteria per gram is ≥10 9 indivual. The compound degreasing bacteria agent is composed of 2 strains of degreasing bacteria, which are sourced from the General Microorganism Collection Center (CGMCC) of the China Microbiological Culture Collection Management Committee, and the preservation numbers are: CGMCC No.13903 and CGMCC No.13902. The ratio of the two strains ...

Embodiment 3

[0051] Utilize the device of embodiment 1 and the biochemical system that embodiment 2 establishes to the processing of oilfield oily sludge, it comprises the steps:

[0052] 1) In the sludge conditioning tank 2, configure a mud-water mixture with an oil content of 20% by weight. While stirring, control the temperature of the mud-water mixture at 50°C. After conditioning for 2 hours, remove the surface oil slick; the stirring speed is 100r / min ;

[0053] 2) The remaining mud-water mixture is poured into the water-based biochemical pool 7 continuously, and the biochemical system established by the oil-removing compound bacterial agent decomposes for 60 hours to degrade the petroleum substances in the mixture. During the degradation, the biochemical system in the water-based biochemical pool 7 is kept dissolved The oxygen content is 3.8-4.2mg / L; the compound bacterial agent contains GWN-1 strain and GWN-2 strain, and the number of viable bacteria in the biochemical system is 10 ...

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Abstract

The invention discloses water-based deoiling treatment method and device for oily sludge in an oil field. The method includes: a) preparing a sludge/water mixture, weight content of oil being 10-20%;b) continuously pumping the sludge/water mixture into a water-based biochemical tank to decompose the mixture with a deoiling composite microbial agent, which contains GWN-1 strain and GWN-2 strain, for 60-84 hours, live bacteria number of the biochemical system being 10<9>-10<11>/ml; c) feeding the degraded sludge/water mixture into a settlement tank for settlement, then feeding a supernatant into a wastewater treatment device and the settlement, in the bottom layer, into a centrifuge, meanwhile, returning a part of liquid to the water-based biochemical tank; d) after the settlement enters the centrifuge, performing solid-liquid separation, and returning the separated wastewater to a sludge regulation tank for reutilization. The invention also discloses the device for achieving the method. The method and the device are high in biochemical degradation speed and efficiency of the oily sludge.

Description

technical field [0001] The invention relates to the technical field of biological oil removal, in particular to the field of treating oily sludge in oilfields. Background technique [0002] Oilfield oily sludge is the solid waste generated in the process of petroleum exploration and development, gathering and transportation, storage and transportation, refining and wastewater treatment, such as the landing oil sludge produced by drilling and operation, settling tanks, oil storage tanks, three-phase The sludge removed from separators, grease traps, etc. comes from a wide range of sources. Compared with sludge from traditional municipal sewage treatment plants, oily sludge contains a large amount of petroleum substances such as aged crude oil, wax, asphaltene, and inorganic minerals. The oil content is generally 10-50%, and the water content is generally 40-90%. %. In my country's petrochemical industry, an average of 800,000 tons of tank bottom sludge and pool bottom sludge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/12C02F103/10
CPCC02F11/02C02F11/127C02F2103/10
Inventor 庄建全郭鹏李汉周罗江涛林刚
Owner CHINA PETROLEUM & CHEM CORP
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