Device and method for aeration, desulfurization, iron removal and deoxidation of oilfield mixed sewage
A sewage aeration and aggregation technology, applied in the field of oilfield sewage treatment, can solve problems such as low efficiency and inability to synchronously deoxygenate, and achieve the effects of high treatment efficiency, low treatment cost and good oxidation effect.
Active Publication Date: 2022-05-10
CHINA PETROCHEMICAL CORP +2
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Problems solved by technology
[0007] Aiming at the shortcomings of the current oilfield sewage aeration oxidation technology, such as low efficiency and inability to simultaneously remove oxygen, the purpose of the present invention is to provide a device and method for aeration, oxidation, sulfur and iron removal of oilfield compounded sewage, and a deoxidation function. Oilfield sewage After treatment, it is used to inject polymers for oxidation treatment with air to remove S in sewage. 2- and Fe 2+ , and remove residual dissolved oxygen at the same time, and reuse it as a substitute for clear water injection diluted oil displacement polymer
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Embodiment 1
[0041] Embodiment one and embodiment two carry out data comparison, and in present embodiment one, sulfide drops from 8.6mg / L to 0mg / L, ferrous iron drops to 0mg / L from 0.3mg / L, and dissolved oxygen rises from 0mg / L As high as 0.05mg / L, the suspended solids dropped from 7.2mg / L to 6.4mg / L, and the sewage corrosion rate dropped from 0.058mm / a to 0.023mm / a; in the second embodiment, the sulfide dropped from 0.2mg / L to 0mg / L, ferrous iron decreased from 4.5mg / L to 0.2mg / L, the concentration of dissolved oxygen did not change much, suspended solids decreased from 10.6mg / L to 6.47mg / L, and the corrosion rate of sewage decreased from 0.098mm / a to 0.033 mm / a. It can be seen from the comparison of data that the present invention has a better effect of removing sulfur and iron, reducing the concentration of suspended matter in sewage and reducing the corrosion rate of sewage no matter whether it is treating oilfield sewage containing sulfide or oily sewage containing ferrous iron.
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The present invention relates to the aeration, desulfurization, iron removal and deoxidation device and method for oilfield complex sewage, which utilizes the oxidation ability of oxygen in the air to separate the ferrous ions and sulfides in the sewage into the deoxidation tower by using the principle of cyclone separation , to separate the excess gas in the sewage, the equipment includes an aeration tower, and also includes a deoxygenation tower, a gas distribution pipe and a liquid distribution pipe, and one end of the gas distribution pipe and liquid distribution pipe is simultaneously connected with the aeration tower gas The other end of the gas distribution pipe is connected horizontally with the gas distribution inlet of the deoxidation tower, and the other end of the liquid distribution pipe is connected with the liquid separation inlet of the deoxidation tower with a downward slope; through this scheme, the aeration, oxidation, and sedimentation , deoxidation and other functions in one, high treatment efficiency, low treatment cost, less sludge volume; after treatment S 2‑ , Fe 2+ The indicators meet the water quality control indicators for polymer dispensing wastewater; at the same time, it has the functions of deoxidation and sedimentation, without supporting deoxidizers, and without subsequent sedimentation and separation facilities.
Description
technical field [0001] The invention belongs to the field of oilfield sewage treatment, and in particular relates to a device and method for aeration, desulfurization, iron removal and deoxidation of oilfield mixed sewage. Background technique [0002] In the process of oilfield crude oil extraction, the water-containing crude oil extracted from the ground is called "production fluid", and the remaining sewage after separating crude oil from the production fluid is called "oilfield produced water" or "oilfield sewage"; During the development process, the water content of the produced fluid gradually increases. In order to increase the recovery factor and recovery speed, chemical flooding methods such as polymer flooding are often used. The application of this method requires injecting a large amount of high molecular weight polymer into the reservoir. Solution flooding agent, polymer flooding development usually uses oilfield sewage as the dilution water of polymer mother li...
Claims
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IPC IPC(8): C02F9/04C02F103/10C02F101/10C02F101/20
CPCC02F9/00C02F2103/10C02F1/74C02F1/20C02F1/38C02F1/70C02F2001/007C02F2101/101C02F2101/203C02F2301/08
Inventor 张磊姚明修李育杨燕平彭刚呙如地黄文升肖小龙廖土兴
Owner CHINA PETROCHEMICAL CORP