Unlock instant, AI-driven research and patent intelligence for your innovation.

A low-cost shale gas fracturing flowback fluid treatment system and treatment method

A treatment system and flowback liquid technology, applied in mining wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of high cost and low recovery rate, and achieve strong anti-pollution ability and low treatment cost Low, reduce the effect of dosage

Active Publication Date: 2022-05-03
成都硕特科技股份有限公司
View PDF32 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems of high cost and low recovery rate existing in the existing fracturing flowback fluid treatment methods, the present invention provides a low-cost shale gas fracturing flowback fluid treatment system and treatment method. The treatment system of the present invention And the treatment method can effectively treat the high content of organic matter, calcium and magnesium, salt and other pollutants in the fracturing flowback fluid, and at the same time improve the water recycling rate, which not only protects the water resource environment, but also reduces the treatment cost and promotes page The stable development of rock gas mining enterprises overcomes the shortcomings of existing technologies

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A low-cost shale gas fracturing flowback fluid treatment system and treatment method
  • A low-cost shale gas fracturing flowback fluid treatment system and treatment method
  • A low-cost shale gas fracturing flowback fluid treatment system and treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, a low-cost shale gas fracturing flowback fluid treatment system includes a gel breaking and impurity removal system 2, a high-pressure nanofiltration membrane system 4 and a high-pressure reverse osmosis membrane system 7, and the input terminal of the gel breaking and impurity removal system 2 is connected to Through the fracturing flowback fluid delivery pipeline, its output end is connected to the high-pressure nanofiltration membrane system 4, and the figure 1 Among them, the input end of the gel breaking and impurity removal system 2 is connected to the raw water tank 1, and its output end is connected to the high-pressure nanofiltration membrane system 4 through the first intermediate water tank 3. The raw water tank 1 is used for temporarily storing the fracturing flowback fluid. At the same time, it is convenient to output a stable flow of fracturing flowback fluid to the gel breaking and impurity removal system 2. Correspondingly, the...

Embodiment 2

[0059] Example 2 is the same as Embodiment 1, except that the gel breaker added in the process of breaking and removing impurities is a composite gel breaker of sodium hypochlorite and active agent B, and the mass ratio of sodium hypochlorite to active agent B is 2.25:1. The dosage of compound gel breaker is 1.45%. Under the condition of reaction temperature of 20-35℃, the gel breaking reaction time is 1.6h. The viscosity of wastewater is 3.4mPa·S, which can directly enter the impurity removal membrane system to remove oil and suspended solids and other impurities.

Embodiment 3

[0061] Embodiment 3 is identical with implementation 1, and its difference is that, high-pressure nanofiltration membrane is high-pressure roll-type nanofiltration membrane, and the membrane area of ​​high-pressure roll-type nanofiltration membrane is far greater than disc tube type nanofiltration membrane, can obviously save investment, and The operating pressure can also reach 40-100bar, and the recovery rate can reach 85%-90%. In Example 3, the COD concentration of the fracturing flowback fluid is above 4300mg / L, the calcium is 3000mg / L, the magnesium is 280mg / L, the sulfate radical is 54mg / L, and the chloride ion is about 12700mg / L. After separation, small molecular organics and chlorides in the water enter the product water through the membrane, and the COD in the product water is reduced to 550mg / L, calcium 25mg / L, magnesium 2.8mg / L, sulfate radical is less than 5mg / L, most of the organic matter, Calcium, magnesium, sulfate, etc. are trapped in the concentrated solution,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
lengthaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a low-cost shale gas fracturing flowback fluid treatment system and treatment method, including a gel breaking and impurity removal system, a high-pressure nanofiltration membrane system and a high-pressure reverse osmosis membrane system, and an input terminal connection of the gel breaking and impurity removal system Through the fracturing flowback fluid delivery pipeline, its output end is connected to the high-pressure nanofiltration membrane system, the water output end of the high-pressure nanofiltration membrane system is connected to the high-pressure reverse osmosis membrane system, and its concentrated water output end is connected to the curing system. The product water output end of the reverse osmosis membrane system is connected to the return water delivery pipeline, and the concentrated water output end is connected to the evaporation system. The treatment system and treatment method of the present invention can effectively treat pollutants such as high-content organic matter, calcium and magnesium, and salt in the fracturing flowback fluid, which not only protects the water resource environment, but also reduces the treatment cost compared with the existing treatment methods. Low, high recovery rate of produced water, the final NaCl salt produced meets the first-grade dry salt standard of "Industrial Salt" (GB / T5462-2015), can be used as resources, and solves the environmental protection problems of shale gas mining enterprises.

Description

technical field [0001] The invention relates to the technical field of fracturing flowback fluid treatment engineering in the shale gas exploitation process, in particular to a low-cost shale gas fracturing flowback fluid treatment system and treatment method. Background technique [0002] Shale gas is natural gas that occurs in shale formations, which belongs to unconventional natural gas, and is mainly exploited by hydraulic fracturing. Hydraulic fracturing is a mining method that uses high pressure to drive fracturing fluid into the ground to hydraulically break the formation, thereby releasing the oil or natural gas reserves therein. After the hydraulic fracturing operation is completed, part of the liquid will be drained back to the ground, which is called fracturing flowback fluid. The fracturing of a single shale gas well often consumes more than 20,000 m3 of water, and 10% to 50% of the flowback is flowed back before completion. In the production stage, the flowback...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D3/04C02F103/10
Inventor 黄兴俊胡君杰杨敏倪金元史梦云韦驾江明
Owner 成都硕特科技股份有限公司