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A dehydration method of waste drilling mud based on the coupling of Fenton's oxidation destabilization and scale adsorption aggravation

A technology of drilling mud and Fenton oxidation, which is applied in chemical instruments and methods, mining wastewater treatment, water/sludge/sewage treatment, etc., can solve the problems that clay particles are not easy to sink and lose stability, and achieve pollutant reduction The effect of large capacity, short processing cycle and small processing site volume

Active Publication Date: 2021-10-22
XI'AN PETROLEUM UNIVERSITY +1
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Problems solved by technology

[0005] Aiming at the problems that the existing waste drilling mud is difficult to lose stability and clay particles are not easy to sink, the present invention provides a waste drilling mud dehydration based on the coupling of Fenton’s oxidation destabilization and scale adsorption aggravation based on the characteristics and treatment mechanism of waste drilling mud The method solves the coupling effect of rapid destabilization and gel breaking of waste drilling mud and acceleration of clay particle settlement by calcium sulfate adsorption under simple chemical system and chemical dosage.

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  • A dehydration method of waste drilling mud based on the coupling of Fenton's oxidation destabilization and scale adsorption aggravation

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Experimental program
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Effect test

Embodiment 1

[0019] Take 1000mL of waste drilling mud (water content 65.25%, oil content 3.38%, solid content 31.37%), under constant stirring, first adjust its pH to 3 with concentrated sulfuric acid, then add 180mg ferrous sulfate, 3mL The hydrogen peroxide with a mass concentration of 30% was continuously stirred for 56 minutes, then calcium oxide was added to adjust the pH to 10, the stirring was stopped after 5 minutes, and centrifuged at 2500 r / min for 10 minutes. After treatment, the dehydration rate was 77.15%, the content of suspended matter in the extracted water was 35.21mg / L, the oil content was 2.19mg / L, and the COD was 215.71mg / L; the water content of the bottom sediment was 29.23%, and the oil content was 6.18%.

Embodiment 2

[0021] Take 1000mL of waste drilling mud (water content 45.78%, oil content 24.25%, solid content 29.97%), under constant speed stirring, first adjust its pH to 3 with concentrated sulfuric acid, then add 120mg ferrous sulfate, 120mg Vitamin C and 3mL hydrogen peroxide with a mass concentration of 30% were stirred continuously for 32 minutes, then calcium oxide was added to adjust the pH to 10, the stirring was stopped after 5 minutes, and centrifuged at 2500 r / min for 10 minutes. After treatment, the dehydration rate was 65.23%, the content of suspended matter in the extracted water was 68.79mg / L, the oil content was 17.51mg / L, and the COD was 247.08mg / L; the water content of the bottom sediment was 21.27%, and the oil content was 33.32%.

Embodiment 3

[0023] Take 1000mL of waste drilling mud (water content is 81.22%, oil content is 10.09%, solid content is 8.69%), under constant speed stirring, at first adjust its pH to be 3 with concentrated sulfuric acid, then add 120mg ferrous sulfate, 120mg Vitamin C and 3mL hydrogen peroxide with a mass concentration of 30% were continuously stirred for 29 minutes, then a mixture of calcium oxide and sodium hydroxide with a mass ratio of 1:1 was added to adjust the pH to 10, the stirring was stopped after 5 minutes, and centrifuged at 2500r / min for 10 minutes. After treatment, the dehydration rate is 91.37%, the content of suspended solids in the extracted water is 123.40mg / L, the oil content is 10.13mg / L, and the COD is 174.85mg / L; the water content of the bottom sediment is 27.91%, and the oil content is 37.19%.

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Abstract

The invention discloses a method for dehydrating waste drilling mud based on the coupling of Fenton's oxidation destabilization and scale adsorption aggravation. The method is to oxidize the waste drilling mud through Fenton's reagent mainly composed of concentrated sulfuric acid, ferrous sulfate and hydrogen peroxide After destabilization, calcium oxide is used to adjust the pH value to promote the polymerization of ferric sulfate and ferric hydroxide and the aggregation and deposition of calcium sulfate scale crystals on the surface of clay particles, so as to realize the aggravation of clay particles in the mud, flocculation and settlement, and finally realize the destabilization and dehydration of waste drilling mud . The method of the present invention fully considers the characteristics of waste drilling mud such as high content of organic matter, uniform dispersion of clay, stable suspension system, great difficulty in gel breaking and instability, light weight of clay particles and difficulty in settling, etc., to form oxidation destabilization and clay particles of waste drilling mud. A high-efficiency destabilization dehydration method integrating weighting and polymerization settlement.

Description

technical field [0001] The invention belongs to the technical field of waste drilling mud reduction treatment, and in particular relates to a method for dehydrating waste drilling mud based on the coupling of Fenton oxidation destabilization and scale adsorption aggravation. Background technique [0002] At present, with the further expansion of oil and gas development, a large amount of waste drilling mud is produced during the drilling process. Its main components are clay, drilling cuttings, water, drilling fluid additives and oil. The composition system is stable and belongs to hazardous solid waste. Compared with general oily sludge (such as tank bottom mud, etc.) and high-organic oily sewage (such as fracturing waste fluid, etc.), waste drilling mud has the following characteristics: (1) Relatively low moisture content (50% to 80%) , high clay content (20-50%), low oil content (2%-10%); (2) high organic matter content, long molecular chains, and light clay particles, g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/143C02F11/145C02F11/121C02F11/127C02F11/122C02F103/10
CPCC02F11/121C02F11/122C02F11/127C02F11/14C02F2103/10C02F2303/06
Inventor 鱼涛屈撑囤李金灵杨博
Owner XI'AN PETROLEUM UNIVERSITY
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