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A biological treatment method for fracturing flowback fluid based on besi technology

A fracturing flowback fluid and biological treatment technology, which is applied in biological treatment devices, biological water/sewage treatment, mining wastewater treatment, etc., can solve the problems of high cost and high oil content in effluent, and achieve low treatment costs and effective treatment Effect

Active Publication Date: 2018-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention proposes a biological treatment method for fracturing flowback fluid based on BESI technology in order to solve the problems of high cost and high oil content in effluent in the prior art

Method used

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  • A biological treatment method for fracturing flowback fluid based on besi technology
  • A biological treatment method for fracturing flowback fluid based on besi technology
  • A biological treatment method for fracturing flowback fluid based on besi technology

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specific Embodiment approach 1

[0020] Specific embodiment one: a kind of fracturing flowback fluid biological treatment method based on BESI technology comprises the following steps:

[0021] Step 1: The fracturing flowback fluid enters the anaerobic reaction device (2) through the sewage inlet pump (1) through the bottom water inlet of the anaerobic reaction device (2) for treatment, and the HRT is 20 to 28 hours, and the HRT is water conservancy dwell time;

[0022] Step 2: The fracturing flowback fluid treated in step 1 flows out through the water outlet on the top side wall of the anaerobic reaction device (2), and enters the facultative anaerobic reaction device ( 3), HRT is 20-28 hours;

[0023] Step 3: The fracturing flowback fluid treated in step 2 flows out through the top side wall water outlet of the facultative anaerobic reaction device (3), and enters the aerobic reaction device (4) through the bottom water inlet of the aerobic reaction device (4) ), HRT is 44-52 hours;

[0024] Step 4: The ...

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the anaerobic reaction device (2) is specifically:

[0029] The anaerobic reaction device (2) adopts UASB, ABR, IC or SBR anaerobic reactor, the filler added in the anaerobic reaction device (2) is a suspended filler, and the volume of the added suspended filler is the volume of the anaerobic reaction device (2). 30~50%; the acclimation condition of described suspended packing: the sludge inoculated is the sludge of the anaerobic biological treatment section of Daqing Oilfield Dongfeng Sewage Treatment Plant, and the inoculum amount of sludge is 18~18% of the volume of the anaerobic reaction device (2). 20%, the domestication period is 12-18 days;

[0030] The suspended filler is black polyurethane filler with a size of 4×4×4cm.

specific Embodiment approach 3

[0031] Specific embodiment three: this embodiment is different from one of the specific embodiments one to two: the facultative anaerobic reaction device (3) is specifically:

[0032] The facultative anaerobic reaction device (3) adopts UASB, ABR, IC or SBR anaerobic reactor, and the oxygen in the facultative anaerobic reaction device (2) is obtained by reflux from the aerobic reaction device; The filler added in the reaction device (3) is an elastic filler, and the volume of the added elastic filler is 30% to 40% of the volume of the facultative anaerobic reaction device (3); the domestication conditions of the elastic filler: the inoculated sludge is Daqing Oilfield For the sludge in the anaerobic biological treatment section of Dongfeng Sewage Treatment Plant, the inoculum amount of the sludge is 18-20% of the volume of the facultative anaerobic reaction device (3); the domestication period is 12-18 days;

[0033] The elastic filler is made of PVC with a diameter of 10 cm, ...

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Abstract

The invention relates to a fracturing flowback fluid biological processing method based on a BESI technology, and aims to solve the problems that in the prior art, the process cost is high, and the oil content of effluent is high. The method comprises the following steps: step one, introducing fracturing flowback fluid into an anaerobic reaction device (2) through a sewage intake pump to carry out a treatment, wherein the HRT (hydraulic retention time) is 20 to 28 hours; step two, introducing the fracturing flowback fluid processed in the step one into a facultative anaerobic reaction device (3), wherein the HRT is 20 to 28 hours; step three, introducing the fracturing flowback fluid processed in the step two into an aerobic reaction device (4), wherein the HRT is 44 to 52 hours; step four, directly discharging part of fracturing flowback fluid processed in the step three from a discharging pipe, and returning residual fracturing flowback fluid to the facultative anaerobic reaction device (3), wherein the volume ratio of two parts is 1:1. The provided method is applied to the field of biological processing of fracturing flowback fluid.

Description

technical field [0001] The invention relates to a biological treatment method for fracturing flowback fluid based on BESI technology. Background technique [0002] At present, the exploitation of my country's oilfields has generally entered the middle and late stages, and the use of fracturing operations is of great significance for increasing production and injection in oilfields. The fracturing flowback fluid produced by fracturing operations contains a large amount of toxic and harmful substances. If it is discharged directly without treatment, it will have an important impact on the ecosystem around the oil field. Due to the complex chemical composition, high viscosity, high COD, high suspended solids, high salinity, and difficult biodegradation of fracturing flowback fluid, fracturing flowback fluid is difficult to handle. [0003] At present, the treatment of fracturing flowback fluid is still in the initial stage of exploration, and a complete and easy-to-use treatme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F103/10
CPCC02F3/30C02F2103/10C02F2203/006C02F2209/08C02F2209/10
Inventor 魏利刘璞李春颖魏东魏超
Owner HARBIN INST OF TECH
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