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A multi-dimensional electrode treatment process for shale gas flowback fluid

A multi-dimensional electrode, processing technology technology

Active Publication Date: 2020-08-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method may lead to soil and groundwater pollution, failing to solve the problem fundamentally, and there is also the problem of secondary pollution

Method used

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  • A multi-dimensional electrode treatment process for shale gas flowback fluid
  • A multi-dimensional electrode treatment process for shale gas flowback fluid
  • A multi-dimensional electrode treatment process for shale gas flowback fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Shale gas flowback liquid multi-dimensional electrode treatment process, the steps are as follows:

[0043] (1) Sand settling: remove large particles and cuttings in shale gas flowback liquid; remove larger suspended particles and cuttings in shale gas flowback liquid through natural settlement.

[0044] (2) Chemical coagulation: Add coagulant agent to the flowback liquid after sand settling in step (1), adjust the pH to 6 during the coagulation process, and precipitate; specifically, add a certain amount of polyaluminum chloride (PAC ), after stirring for a period of time, a certain concentration of polyacrylamide (PAM) is added to make the colloidal suspended matter flocculate with each other to form large particles and then precipitate and remove;

[0045] The concentration of polyaluminum chloride is 30%-40%, and the concentration of PAM is 0.1%-0.5%. The concentration and dosage are determined according to the change of water quality. The molecular weight of polya...

Embodiment 2

[0054] The multi-dimensional electrode treatment process for shale gas flowback liquid is characterized in that it includes the following steps:

[0055] (1) Sand settling: remove large particles and cuttings in shale gas flowback liquid; remove larger suspended particles and cuttings in shale gas flowback liquid through natural settlement.

[0056] (2) Chemical coagulation: add coagulation agent to the flowback liquid after grit settling in step (1), adjust the pH to 8 during the coagulation process, and precipitate; specifically, first add a certain amount of polyaluminum chloride (PAC) , after stirring for a period of time, add a certain concentration of polyacrylamide (PAM) to make the colloidal suspended matter flocculate with each other to form large particles, and then precipitate and remove;

[0057] The concentration of polyaluminum chloride is 40%, and the concentration of PAM is generally 0.2%. The concentration and dosage are determined according to the change of w...

Embodiment 3

[0071] The shale gas flowback liquid treatment process based on multi-dimensional electrode technology includes the following steps:

[0072] (1) First, the shale gas flowback fluid passes through the grit chamber to remove large particles;

[0073] (2) Then enter the coagulation tank for coagulation treatment, first add polyaluminum chloride (PAC), the concentration is controlled between 35%, stir for 30 seconds, then add polyacrylamide (PAM), its molecular weight is 8 million, The concentration is controlled at 0.3%, and the stirring time is 30 seconds. After a large number of flocs appear in the water, it enters the sedimentation tank for static precipitation, and the resulting sediment enters the sludge thickening tank for concentration and collection.

[0074] (3) The treated shale gas flowback liquid enters the electrocoagulation device, which uses iron sheets as electrode plates to remove heavy metal ions in the wastewater through redox and flocculation precipitation. P...

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Abstract

The invention belongs to the field of oil and gas field wastewater treatment, and particularly relates to a shale gas flowback fluid electrode treatment technology in the shale gas development process. The treatment technology comprises the steps of sand setting, chemical coagulation, electrocoagulation treatment, multi-dimensional electrode treatment, desalination and the like. According to the shale gas flowback fluid multi-dimensional electrode treatment technology, through the chemical coagulation, the electrocoagulation, the multi-dimensional electrode method treatment and the desalination treatment, pollutants like suspended matter, heavy metal ions, organic matter, a large quantity of salts in a flowback fluid are effectively removed, the treatment efficiency is high, the treatment technology is green and environmentally friendly, good economic benefits and social benefits are obtained, and the treatment technology is worthy of application and popularization.

Description

technical field [0001] The invention belongs to the field of oil and gas field wastewater treatment, and in particular relates to a treatment process for shale gas flowback liquid in the shale gas development process. Background technique [0002] Shale gas is an important unconventional natural gas resource extracted from shale formations. The formation and enrichment of shale gas has its own unique characteristics, and it is often distributed in thicker and widely distributed shale and source rock formations in the basin. Compared with conventional natural gas, shale gas development generally has the characteristics of long mining life and long production cycle. Since most gas-producing shales are widely distributed, thick, and generally contain gas, shale gas wells can be used for long-term production. Produces gas at a steady rate. [0003] The amount of shale gas resources in China is about 15 trillion to 30 trillion cubic meters, which is roughly equivalent to the 28...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/461C02F11/12
CPCC02F1/46104C02F1/46109C02F1/463C02F1/5236C02F1/56C02F1/66C02F9/00C02F11/12C02F2001/007C02F2001/46133C02F2301/08C02F2305/023
Inventor 梁宏邱阳任阳民王兵李永涛任宏洋
Owner SOUTHWEST PETROLEUM UNIV
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