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Method and process for advanced treatment of well drilling effluent

A technology of drilling waste fluid and process, which is applied in the fields of energy waste water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc.

Inactive Publication Date: 2011-08-03
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Persulfate oxidation technology based on sulfuric acid radicals, limited by persulfate cost and etc.

Method used

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  • Method and process for advanced treatment of well drilling effluent
  • Method and process for advanced treatment of well drilling effluent
  • Method and process for advanced treatment of well drilling effluent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 12g / L inorganic coagulant polyaluminium chloride and 100mg / L organic flocculant cationic polyacrylamide to waste organic silicon drilling fluid discharged from an oil field, stir at high speed (300r / min) for 90s, and stir at low speed (20r / min) 10 to 15 minutes, centrifuge with a centrifuge at 3400r / min for 2 minutes. The residual turbidity of the separated water is 18FTU (10530FTU before treatment), the residual color is 5 times (10000 times before treatment), COD Cr 1100mg / L (1.4×10 before treatment 4 mg / L), and the removal rate reached more than 99%. Adjust the pH value of the separated water to 4, then add hydrogen peroxide (30%) 7ml / L, 1.5g / L ammonium persulfate, 0.5mmol / L ferrous sulfate, and irradiate with sunlight for 120 minutes at 15-20°C Finally, use lime milk to adjust the pH value to 8-9, and catalyze the oxidation of water COD Cr It is 147.6mg / L; after 120 minutes of irradiation in an externally illuminated photochemical reactor with simulated sunli...

Embodiment 2

[0026] For waste polymer drilling fluid discharged from an oil field, add 16g / L inorganic coagulant polyaluminum chloride and 120mg / L organic flocculant cationic polyacrylamide, stir at high speed (300r / min) for 90s, and stir at low speed (20r / min) 10 to 15 minutes, centrifuge with a centrifuge at 3400r / min for 2 minutes. The residual turbidity of the separated water is 8FTU (8150FTU before treatment), the residual color is 10 times (8000 times before treatment), COD Cr 730mg / L (6.6×10 before treatment 4 mg / L), and the removal rate reached more than 99%. Adjust the pH value of the separated water to 4, then add hydrogen peroxide (30%) 7ml / L, 1.5g / L ammonium persulfate, 0.5mmol / L ferrous sulfate, and irradiate with sunlight for 120 minutes at 15-20°C Finally, use lime milk to adjust the pH value to 8-9, and catalyze the oxidation of water COD Cr It is 147.2mg / L; after 120 minutes of radiation in an externally illuminated photochemical reactor with simulated sunlight (long-ar...

Embodiment 3

[0031] Add 12g / L inorganic coagulant polyaluminum chloride and 60mg / L organic flocculant cationic polyacrylamide to the waste potassium salt polymer drilling fluid discharged from an oil field, stir at high speed (300r / min) for 90s, and stir at low speed (20r / min ) stirring for 10 to 15 minutes, and centrifuged for 2 minutes with a centrifuge at 3400 r / min. The residual turbidity of the separated water is 8FTU (32600FTU before treatment), the residual color is 20 times (13500 times before treatment), COD Cr 1059.6mg / L (4.4×10 before treatment 4 mg / L), and the removal rate reached more than 99%. Adjust the pH value of the separated water to 4, then add hydrogen peroxide (30%) 7ml / L, 1.0g / L ammonium persulfate, 0.5mmol / L ferrous sulfate, and irradiate with sunlight for 120 minutes at 15-20°C Finally, use lime milk to adjust the pH value to 8-9, and catalyze the oxidation of water COD Cr It is 190.8mg / L; after 120 minutes of irradiation in an externally illuminated photochemic...

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Abstract

The invention relates to a method and processes for the advanced treatment of well drilling effluent. The method comprises the following processes of: chemically-enhanced solid-liquid separation, mechanical dehydration, treatment by the advanced oxidation technology and the like. The method comprises: adding 2 to 16 g / L of polyaluminium chloride into the well drilling effluent, stirring quickly and uniformly, adding 50 to 200 mg / L of cationic polyacrylamide, stirring at low speed for 10 to 15 minutes, so that the drilling waste liquid destabilized and agglutinated, and dehydrating in a centrifugal mode; and performing advanced oxidation treatment on the well drilling waste liquid from which solids are separated, regulating the pH value of the well drilling waste liquid to be 4, performing a reaction by taking hydrogen peroxide and ammonium persulfate as a composite oxidizing agent and ferrous sulfate as a catalyst under the condition of daylight or simulated daylight for 120 to 150 minutes, regulating the pH value of the well drilling waste liquid to be between 8 and 9 by using lime milk, clarifying, and discharging or performing the treatment in other modes. By the method, indexes such as the suspended solids, chromaticity, chemical oxygen demand (CODCr) and the like in the well drilling waste liquid are reduced substantially, so the method has a bright application prospect.

Description

technical field [0001] The invention relates to the technical field of oil and gas field environmental protection. Background technique [0002] Drilling waste fluid mainly refers to the waste drilling fluid discharged during the oil drilling process and the waste fluid composed of cleaning fluid, well fluid, and sewage (formed by rainwater flushing the well site with some mud and oily substances) of various operating equipment, etc. Among them, waste drilling fluid is the main part. The main pollution characteristics are COD Cr High, high chroma, high suspended solids content and easy to disperse in water. [0003] A variety of chemical treatment agents and surfactants are added to the waste drilling fluid. Its composition is relatively complex, and generally contains heavy metals, oils, bentonite, alkalis and compounds (including organic matter) that are harmful to humans, animals and the environment. Such as iron chromium salt, sulfonated asphalt, sulfonated tannin ext...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCY02W10/37
Inventor 邱正松张现斌陶瑞东徐加放黄维安江琳齐金涛田刚胡培山
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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