Advanced treatment method for fracturing flow-back fluid

A fracturing flowback fluid and advanced treatment technology, which is applied in the advanced treatment of fracturing flowback fluid and the treatment of fracturing flowback fluid, can solve the problems of poor treatment effect, high cost, and inability to continuously treat, and achieve cost The effect of low, lower processing cost and high removal rate

Active Publication Date: 2011-08-24
四川绿源环保技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to propose an advanced treatment method for fracturing flowback fluid with good effect an

Method used

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  • Advanced treatment method for fracturing flow-back fluid

Examples

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Effect test

Embodiment 1

[0028] Send 100L of fracturing flowback fluid produced during the development and production of oil and gas fields into the coagulation sedimentation tank 1, adjust the pH to 8, then add 100g of potassium permanganate for pre-oxidation for 8 hours, and keep stirring at the same time, the COD removal rate is 20% ; Then add 100g PAC and 200g aluminum sulfate to carry out gel breaking treatment, after processing for 0.5 hours, enter filter press 2 and carry out pressure filtration; the waste liquid after the pressure filtration enters the water storage adjustment tank 3, after adjusting the pH to be 3, the waste liquid Pump into the oxidation tank 4, add hydrogen peroxide (concentration 30%) 300mL, ferrous sulfate 18g, react for 10 hours; the waste liquid after the reaction is sent into the secondary coagulation tank 5 again, add tannin biological extract 1g and carry out secondary mixing Coagulate, react for 2 hours, adjust the pH of the waste liquid to be 8; send the waste liqui...

Embodiment 2

[0030] Send 250L of fracturing flowback fluid produced during the development and production of oil and gas fields into the coagulation sedimentation tank 1, adjust the pH to 12, then add 1L hypochlorous acid for pre-oxidation for 4 hours, and keep stirring at the same time, the COD removal rate is 25%; Then add 500g PAC and 750g aluminum sulfate coagulant to carry out gel breaking treatment for 2 hours, then enter filter press 2 for filtration; the waste liquid after filtration enters water storage adjustment tank 3, after adjusting the pH to 5, the waste liquid is pumped into Oxidation tank 4, add 2.25L of hydrogen peroxide (concentration 30%), ferrous sulfate 360g, react for 5 hours; the waste liquid after the reaction is sent to secondary coagulation tank 5, add 11g of tannin biological extract for secondary coagulation , react for 0.5 hour, adjust pH to be 12; Waste liquid 220L after the secondary coagulation is pumped into mixing jet 8, open ozone generator 9 simultaneous...

Embodiment 3

[0032]Send 330L of fracturing flowback fluid produced during the development and production of oil and gas fields into the coagulation sedimentation tank 1, adjust the pH to 10, then add 300g of potassium permanganate for pre-oxidation for 6 hours, and keep stirring at the same time, the COD removal rate is 30% ; then add 990g PAC and 1320g aluminum sulfate coagulant to carry out gel breaking treatment after 1 hour, enter filter press 2 to filter; the waste liquid after filtering enters water storage adjustment tank 3, after adjusting pH to be 4, waste liquid pump Enter oxidation pool 4, add hydrogen peroxide (concentration 27%) 2.2L, ferrous sulfate 297g, react 2 hours; The waste liquid after the reaction is sent into secondary coagulation tank 5 again, adds tannin biological extract 5g and carries out secondary mixing Coagulate, react for 1 hour, adjust the pH to 10; pump 290L of waste liquid after the secondary coagulation into the mixing jet 8, and open the ozone generator ...

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Abstract

The invention discloses an advanced treatment method for fracturing flow-back fluid, belongs to the field of water treatment of the development of oil and gas fields, and particularly relates to an advanced treatment method for the fracturing flow-back fluid generated during the operation of the oil and gas fields. The treatment method for the fracturing flow-back fluid, which has high effect and continuous treatment process, is provided to solve the problems that the treatment effect is lower, the continuous treatment cannot be performed, and the cost is higher existing in the prior art. The method comprises the following steps of: pre-oxidizing waste liquor with the pH value of between 8 and 12, adding a coagulant and performing gel breaking treatment and adding a Fenton reagent and treating, and performing secondary coagulation and oxidization treatment. In the method, through homogeneous and heterogeneous catalysis reactions, the treatment cost is reduced, and the removal rate of organic substances is also high; and chemical oxygen demand (COD) of effluent can meet the national sewage discharge standard.

Description

technical field [0001] The invention relates to a treatment method for fracturing flowback fluid, in particular to an advanced treatment method for fracturing flowback fluid produced during oil and gas field operations, and belongs to the field of water treatment for oil and gas field development. Background technique [0002] Fracturing is one of the main measures for oil and gas well stimulation, and it is widely used in various oil fields. The residual fracturing fluid discharged during the operation has many points and wide areas, high pollutant concentration, scattered pollution sources, and large discharge volume (generally, at least 300m3 of viscous waste liquid will be produced after fracturing each well. 3 If the fracturing fluid flowed back to the ground is discharged without treatment, it will pollute the surrounding environment, especially crops and surface water systems. The fracturing flowback fluid contains guar gum, formaldehyde, petroleum and various other ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/78
Inventor 王兵任宏洋李毅柴苗峰
Owner 四川绿源环保技术开发有限公司
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