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A low-cost treatment and resource utilization method for high-salt gas field water

A gas field water and high salt content technology, applied in the field of electrodialysis desalination, can solve the problems of difficulty in finding reinjection wells, high cost, and affecting the production of established gas fields, and achieves the effect of huge application potential and solving the problem of wastewater

Active Publication Date: 2021-09-07
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] To sum up, the salinity of gas field water is very high, and the COD value is tens to several thousand mg / L, making it increasingly difficult to find suitable reinjection wells; and the large amount of mixed salt produced by evaporation and crystallization can basically only be filled However, it is difficult to use alkali, carbonate and sulfate to remove calcium and magnesium ions due to the high concentration of calcium and magnesium ions, and too much slag is produced. Catalytic oxidation, potassium permanganate, sodium hypochlorite, Fenton and other oxidations face the limitation of high cost.
As the requirements for environmental protection become more and more stringent, the treatment of gas field water has become an unfavorable factor restricting the development of natural gas mining enterprises, affecting the development of new gas fields and even the production of established gas fields

Method used

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  • A low-cost treatment and resource utilization method for high-salt gas field water
  • A low-cost treatment and resource utilization method for high-salt gas field water
  • A low-cost treatment and resource utilization method for high-salt gas field water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 (high-salt and high-COD gas field water)

[0036] The gas field water composition is as follows: NaCl content 5.2 wt.%, COD 4600 mg / L.

[0037] The electrodialyzer includes a pair of positive and negative plates, 2 anion exchange membranes, 3 cation exchange membranes, 2 separators between the cation exchange membrane and the plates, and 4 flow channels between the anion exchange membranes. The positive membrane is a sulfonic acid type homogeneous cation exchange membrane with a thickness of about 0.130 mm and a resistance of 9.9 Ω.cm 2 , with a water content of 25%; the anion membrane is a quaternary ammonium type homogeneous anion exchange membrane with a thickness of about 0.150 mm and a resistance of 11.6 Ω.cm 2 , the water content is 35%; the area of ​​a single membrane is about 0.03 m 2 . The thickness of the separator and flow channel is about 0.5 mm, with 0.1 M Na 2 SO 4 The solution is polar liquid, a voltage of 1.12 V is applied between the two ...

Embodiment 2

[0040] Example 2 (high-salt gas field water prone to fouling, nanofiltration-electrodialysis)

[0041] The composition of gas field water is: NaCl content 5.8 wt.%, CaSO 4 The content is 1.36 g / L.

[0042] The operating pressure of the nanofiltration membrane separator is 12 bar, and the effective membrane area is 214.5 cm 2 , The recovery rate is about 76%. After nanofiltration, gas field water becomes retentate and permeate, the composition of which is shown in Table 1.

[0043] The electrodialyzer includes a pair of positive and negative plates, 10 anion exchange membranes, 11 cation exchange membranes, 2 separators between the cation exchange membrane and the plates, and 20 flow channels between the anion exchange membranes. The positive membrane is a sulfonic acid type homogeneous cation exchange membrane with a thickness of about 0.130 mm and a resistance of 9.9 Ω.cm 2 , with a water content of 25%; the anion membrane is a quaternary ammonium type homogeneous anion e...

Embodiment 3

[0048] Embodiment 3 (low COD-divalent ion wastewater)

[0049] The gas field water composition is as follows: NaCl content 6.6 wt.%, MgCl 2 Content 3.9 wt.%.

[0050] The electrodialyzer includes a pair of positive and negative plates, 11 cation exchange membranes, 11 bivalent selective cation exchange membranes, 10 anion exchange membranes, 2 separators between the ion exchange membrane and the plates, cation exchange 11 flow channels between the membrane and a divalent selective cation exchange membrane, 10 flow channels between a divalent selective cation exchange membrane and an anion exchange membrane, and 10 flow channels between a cation exchange membrane and an anion exchange membrane 10. The positive membrane is a heterogeneous cation exchange membrane with a thickness of about 0.40 mm and a resistance of 30 Ω.cm 2 , with a moisture content of 40%; the first and second valence selective cation exchange membranes are commercial products with a thickness of about 0.2...

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Abstract

The invention belongs to the electrodialysis desalination technology, in particular to a low-cost treatment and resource utilization method for high-salt gas field water. Separate the salt and COD wastewater in the high-salt gas field water through electrodialysis; use nanofiltration-electrodialysis to decompose the easy-to-scale salt in the wastewater to generate soluble salt; The mixed salt is analyzed and concentrated; the brine extracted by the above-mentioned methods is further concentrated and crystallized by membrane distillation, mechanical vapor recompression or multi-effect evaporation to recover industrial salt, and the extracted COD wastewater is further removed by biochemical method and reused. emission. The process of the present invention avoids direct use of membrane distillation, mechanical steam recompression or multi-effect evaporation, concentration and crystallization to recover salt with high organic content and cannot be sold, avoids the recovered salt being mixed salt and becomes solid waste, and also avoids excessive salinity , The deficiency that affects the stable operation of the biochemical system. The invention not only solves the waste water problem, but also recycles water and salt resources in the waste water, and has great application potential.

Description

technical field [0001] The invention belongs to the electrodialysis desalination technology, in particular to a low-cost treatment and resource utilization method for high-salt gas field water. Background technique [0002] Gasfield water is the formation water brought out from the gas well along with the natural gas during the natural gas production process and the condensed water produced during the gas gathering and production process. The composition of gas field water in different regions varies greatly. Even in the same gas field, the water quality and quantity of gas field water vary greatly at different times. Generally, the salinity is tens of thousands to hundreds of thousands mg / L, and the COD value is tens to Several thousand mg / L. [0003] Gas field water reinjection is currently the main treatment method, which includes coagulation, filtration and fine filtration units. Water reinjection wells in gas fields need to meet the following conditions: (1) large wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F9/10C02F1/469
CPCC02F1/048C02F1/442C02F1/447C02F1/4693C02F3/00C02F9/00C02F2103/10C02F2301/08Y02A20/124
Inventor 张杨谭明刘茹孙小寒史元腾张宇菲
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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