Combined treatment process and system for complex oil and gas field drilling and completion wastewater
A treatment process and treatment system technology, applied in the field of combined treatment process and system of complex wastewater from drilling and completion of oil and gas fields, can solve the problems of consumption, large fluctuation of salt content, increase of salt content, etc., so as to improve treatment efficiency and reduce The effect of system energy consumption and high degree of automation
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Embodiment 1
[0044] Such as figure 1 As shown, the present invention also provides a combined treatment process for oil and gas field drilling and completion complex wastewater, specifically comprising the following steps:
[0045] Mix thoroughly and separate oil: Sewage (pH value 5-8, chroma ≥ 500 times, conductivity 40000-60000μs / cm, mainly contains organic matter, high salt, suspended matter, mineral oil and heavy metals, etc., among which the concentration of high salt is 3000 -6000mg / L, the concentration of mineral oil is 50-100mg / L, the concentration of suspended matter is about 500mg / L) first enter the mixing pool 11 to balance the water quality (do not need to add any medicine, the purpose is to uniform water quality), the residence time is 10h Enter grease trap 12 afterwards to remove slick oil (comprising complex mixture of various hydrocarbons such as alkane, cycloalkane and aromatic hydrocarbon), relative density is less than 1.0), stay 2h, sewage can reach the purpose of remov...
Embodiment 2
[0056] Such as figure 1 As shown, the present invention provides a combined treatment system for complex wastewater from drilling and completion in oil and gas fields, which is used to implement the above-mentioned process. The floating unit 3, evaporation and desalination unit 4 and MBR unit 5 are independently fixed on the steel structure frame to form a whole. The smoothing and oil-separating unit 1 includes a smoothing tank 11 and a grease-separating tank 12 connected in sequence; the hardness-removing unit 2 is selected from the prior art, and its specific structure will not be repeated here, for example, it can be a conventional softening tank; The air flotation unit 3 is selected from the prior art, and its specific structure will not be repeated here, for example, it can be a conventional air flotation device; the evaporation and desalination unit 4 is selected from the prior art, and its specific structure will not be repeated here. To repeat, for example, it can be ...
Embodiment 3
[0057] Embodiment 3 Treatment process of the present invention and the effect test of system
[0058] In order to verify the effect of the treatment process and system described in the present invention, under the condition of the same influent water quality, we adopted the method described in the present invention on November 1, 2018 at the drilling and completion wastewater treatment site in Iraq's Al-Ahdab Oilfield. The combined treatment process and system have been tested for a period of one month (see Table 1), and it is required to meet or exceed the first-level A standard of GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants" of the People's Republic of China after treatment, that is, COD Cr Equal to or less than 50mg / L, the oil concentration is equal to or less than 2mg / L, the ss concentration is equal to or less than 10mg / L, and the chroma is equal to or less than 30 times. Wherein, the designed treatment water volume Q=4 tons / hour of the t...
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Abstract
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