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Efficient treatment, recycling and zero emission method and system for shale gas flowback fluid

A technology for flowback liquid and shale gas, applied in mining wastewater treatment, water/sewage treatment, chemical instruments and methods, etc. The effect of good separation effect and high mechanical strength

Active Publication Date: 2021-03-05
刘百仓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effluent quality of this process is good, but the power consumption and cost are high during the operation of the process, and there is no treatment and disposal process for concentrated sludge and desalination concentrate, which cannot achieve zero discharge in the process, and still has certain harm to the environment

Method used

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  • Efficient treatment, recycling and zero emission method and system for shale gas flowback fluid
  • Efficient treatment, recycling and zero emission method and system for shale gas flowback fluid
  • Efficient treatment, recycling and zero emission method and system for shale gas flowback fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Such as figure 2 As shown, the high-efficiency treatment, reuse, and zero discharge system of shale gas flowback fluid described in this implementation includes a primary processing unit, a secondary processing unit, an advanced processing unit, a concentrated liquid processing unit, a sludge processing unit, and a PLC control unit.

[0077] The primary treatment unit includes a solution pool, a tubular static mixer, a perforated swirl flocculation tank, a transition section, and an inclined tube sedimentation tank; the flocculation tank, transition section, and sedimentation tank are connected in sequence, and the bottom of the flocculation tank is set The steel frame structure is raised to raise the water level to ensure gravity flow and good hydraulic conditions; the perforated swirl flocculation tank is divided into 6 grids; the inclined tube sedimentation tank includes the bottom mud discharge area, water distribution area, There are four divisions in the incline...

Embodiment 2

[0085] The system described in Example 1 was used to treat shale gas flowback fluid.

[0086] The pH of the shale gas flowback fluid at a well site in Sichuan is 6.76, the color is yellowish, and there is no pungent smell. The specific parameters are shown in Table 1:

[0087] Table 1 Water quality of shale gas flowback fluid at a wellsite in Sichuan

[0088]

[0089] A method for treating shale gas flowback liquid with high-efficiency treatment, reuse, and zero discharge system, comprising the following steps:

[0090] According to the actual amount of treated water and the actual application scenario, the shale gas flowback liquid outside the system is continuously and stably transported to the inside of the system by means of pressurized water delivery by the pump;

[0091] For the first preparation of coagulant agent, it is necessary to manually inject tap water into the solution pool to the design liquid level, add the agent to the solution pool through the automatic ...

Embodiment 3

[0120] It is basically the same as in Example 1, the only difference is that the mixing and flocculation devices respectively select a mechanical mixing tank and a mechanical flocculation tank, which have better adaptability to changes in water quality and quantity, and occupy a larger area, but can obtain Better processing effect. The working principle and method of the system are the same as those in Implementation 1.

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Abstract

The invention provides an efficient treatment, recycling and zero emission method and system for shale gas flowback fluid. The method comprises coagulating sedimentation, catalytic ozonation, an MBR method, reverse osmosis, membrane distillation, a mechanical vapor recompression (MVR) evaporator, sludge dehydration, and safe landfill or resource utilization. The system comprises a primary treatment unit, a secondary treatment unit, an advanced treatment unit, a concentrated solution treatment unit, a sludge treatment unit and an automatic control unit. All the units are arranged in one or morecontainers to form the modular and movable skid-mounted device. By means of the process, suspended solids, colloids, organic matter, salt ions and other pollutants in the shale gas flowback fluid canbe efficiently removed, the effluent quality can meet reinjection, emission and various reuse standards, and meanwhile zero emission of the whole system is achieved. The system is free of environmental pollution, capable of effectively operating for a long time, easy to maintain, small in occupied area, flexible and convenient to use, and the skid-mounted device is quite suitable for treating shale gas flowback fluid.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, in particular to the field of shale gas flowback liquid treatment in the shale gas development process. Background technique [0002] Shale gas has superior performance and great development potential. Shale gas is an unconventional natural gas resource that exists in shale formations in the state of adsorption, dissolution, and dissociation. Compared with conventional natural gas, shale gas has many advantages such as wide distribution, huge scale, and environmental protection. Its development It also has the advantages of long mining life, long production cycle and high output. With the increasing demand for energy, the reserves and production of crude oil are gradually insufficient. Shale gas has become a new bright spot in the exploration and development of global oil and gas resources. In the next few decades, shale gas will change the world's energy supply pattern. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/12C02F101/30C02F103/10
CPCC02F9/00C02F11/12C02F1/5245C02F1/56C02F1/78C02F1/725C02F3/1268C02F1/444C02F1/441C02F1/08C02F2101/30C02F2103/10Y02W10/10
Inventor 刘百仓纪轩宇
Owner 刘百仓
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