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Integrated processing method of fracturing flow-back fluid

A fracturing flowback fluid and treatment method technology, applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve problems such as high technical achievability requirements, cumbersome processes, and expensive treatment costs. , to reduce costs, strengthen processing efficiency, and simplify equipment.

Active Publication Date: 2014-01-29
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex composition of fracturing waste fluid and the difficulty in treatment, these technologies have some defects more or less, such as low treatment efficiency, cumbersome process, long process, expensive treatment cost, complex treatment facilities or high technical feasibility requirements, etc.
To sum up, the current treatment technology cannot meet the high-efficiency treatment requirements of fracturing flowback fluid.

Method used

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  • Integrated processing method of fracturing flow-back fluid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1. Integrated treatment of fracturing flowback fluid

[0035] The fracturing flowback fluid of an oil well in an oilfield has a pH value of 6, and the COD, oil content and suspended solids content are 4020mg / L, 30mg / L and 340mg / L respectively, all of which are higher than the national standards of 300mg / L and 12mg / L and 200mg / L.

[0036] Put 4L fracturing flowback fluid in figure 1 In the three-dimensional electrode-ultrasound-advanced oxidation coupled reactor shown, the electrode plate combination is set as a ruthenium-iridium composite electrode (anode)-aluminum electrode (cathode)-activated carbon electrode (third electrode), and the effective area of ​​the electrode plate is related to the fracturing The ratio between flowback liquid is 0.1cm 2 / L. Adjust the pH value to 3, the distance between the electrode plates to 6.0cm, the electrolysis current to 5.5A, the ultrasonic power to 200W, the frequency to 60kHz, add potassium ferrate (5.0g / L), and trea...

Embodiment 2

[0037] Embodiment 2. Integrated treatment of fracturing flowback fluid

[0038] The fracturing flowback fluid of an oil well in an oilfield has a pH value of 6, and the COD value, oil content and suspended solids content are 4020mg / L, 30mg / L and 340mg / L respectively, all of which are higher than the national standards of 300mg / L and 12mg / L L and 200mg / L.

[0039] Put 4L fracturing flowback fluid in figure 1 In the three-dimensional electrode-ultrasound-oxidation coupled reactor shown, the electrode plate combination is set as a ruthenium-iridium composite electrode (anode)-aluminum electrode (cathode)-activated carbon electrode (third electrode). The ratio between drains is 0.1cm 2 / L. The pH value was adjusted to 3, the distance between the electrode plates was 6.0cm, the electrolytic current was 5.5A, the ultrasonic power was 200W, and the frequency was 60kHz, and Fenton’s reagent (oxidant (H 2 o 2) is 5.0g / L, exclusive catalyst (Fe 2+ ) 1.2g / L), after 60 minutes of tr...

Embodiment 3

[0040] Embodiment 3. Integrated treatment of fracturing flowback fluid

[0041] The fracturing flowback fluid of an oil well in an oilfield has a pH value of 6, and the COD value, oil content and suspended solids content are 4020mg / L, 30mg / L and 340mg / L respectively, all of which are higher than the national standards of 300mg / L and 12mg / L L and 200mg / L.

[0042] Put 4L fracturing flowback fluid in figure 1 In the three-dimensional electrode-ultrasound-oxidation coupled reactor shown, the electrode plate combination is set as a ruthenium-iridium composite electrode (anode)-aluminum electrode (cathode)-activated carbon electrode (third electrode). The ratio between drains is 0.1cm 2 / L. Adjust the pH value to 3, the distance between the electrode plates to 6.0cm, the electrolysis current to 5.5A, the ultrasonic power to 200W, and the frequency to 80kHz, adding (oxidant (H 2 o 2 ) is 5.0g / L, exclusive catalyst (Fe 2+ ) 1.2g / L), after 90 minutes of treatment, the COD value ...

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Abstract

The invention discloses an integrated processing method of fracturing flow-back fluid. The integrated processing method comprises the following step of carrying out three-dimensional electrode electrochemical treatment on the fracturing flow-back fluid under the conditions of ultrasonic waves and an oxidant, thus realizing processing of the fracturing flow-back fluid, wherein the three-dimensional electrochemical treatment is carried out in an electrolytic tank. The integrated processing method can be integrally finished in one set of equipment, and the equipment is simplified and the cost is reduced while the processing efficiency is intensified. The processing method can be used for efficiently removing harmful ingredients, such as petroleum, suspended solids, organic pollutants and the like in the fracturing flow-back fluid, has the processing effect remarkably prior to that of a single technology, and has an industrial application prospect.

Description

technical field [0001] The invention relates to an integrated treatment method for fracturing flowback fluid, which belongs to the field of sewage treatment for oil and gas field development. Background technique [0002] There are huge low-permeability reserves in the world, and fracturing is the key technology for their development. During the fracturing construction process, a large amount of fracturing flowback fluid will inevitably be produced. The main sources are the large amount of well washing wastewater produced by the active water washing operation before and after the construction, the fracturing gel breaking fluid discharged from the wellbore after the fracturing construction is completed, and Apply the remaining fracturing raw gel fluid (base fluid). Fracturing flowback fluid generally has the following characteristics: ① Discrete intermittent discharge, large discharge volume (100-300m 3 / well times); ②The pollutant composition is complex and seriously poll...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/72C02F1/36C02F1/78C02F1/76
Inventor 陈文娟张健朱江李如茵靖波檀国荣
Owner CHINA NAT OFFSHORE OIL CORP
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