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Harmless treatment agent for waste drilling fluid

A technology of harmless treatment and waste drilling fluid, which is applied in the field of oil field drilling fluid, can solve the secondary pollution of harmful substances and other problems, and achieve the effect of solving the risk of environmental pollution

Inactive Publication Date: 2015-09-30
BEIJING AOYIER ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problem that the existing waste drilling fluid "solidification" treatment method in the background technology cannot fundamentally remove its harmful substances and easily cause secondary pollution, and provides a harmless treatment agent for waste drilling fluid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Weigh 1g of hydrochloric acid, 0.49g of calcium oxide, 0.21g of sodium bisulfite, 1g of hydrogen peroxide, 1g of ferrous sulfate, 2g of calcium hypochlorite, 0.45g of polyaluminum, 1.05g of aluminum sulfate, and 0.05g of polyacrylamide, and weigh them in order. The above agents were added to 100 g of waste drilling fluid and stirred evenly, and the waste drilling fluid harmless treatment product could be obtained after solid-liquid separation.

Embodiment 2

[0013] Weigh 1.3 tons of hydrochloric acid, 0.5 tons of calcium oxide, 0.25 tons of sodium bisulfite, 1 ton of hydrogen peroxide, 1 ton of ferrous sulfate, 2.3 tons of calcium hypochlorite, 0.5 tons of polyaluminium, 1.25 tons of aluminum sulfate, and 0.07 tons of polyacrylamide , add the above-mentioned agents to 100 tons of waste drilling fluid in order and stir evenly, and the waste drilling fluid harmless treatment product can be obtained after solid-liquid separation.

Embodiment 3

[0015] Weigh 2.5 tons of hydrochloric acid, 1 ton of calcium oxide, 0.5 tons of sodium bisulfite, 2 tons of hydrogen peroxide, 2 tons of ferrous sulfate, 4.5 tons of calcium hypochlorite, 1 ton of polyaluminium, 2.5 tons of aluminum sulfate, and 0.15 tons of polyacrylamide , add the above-mentioned agents to 200 tons of waste drilling fluid in order and stir evenly, and the harmless treatment product of waste drilling fluid can be obtained after conventional solid-liquid separation.

[0016] In above-mentioned embodiment 1-3, the product that waste drilling fluid obtains after harmless treatment, pH value is reduced to 8.5 by original 10.33, and chemical oxygen demand CODCr (mg / L) is reduced to 115 by 2500, chromaticity (diluted multiple) from 160 to 60; pollutant control index (mg / kg): mercury from 0.6 to 0.3, arsenic from 75 to 54, chromium from 130 to 55.9, cadmium from 4.5 to 1.5, lead from 150 8.4, copper dropped from 140 to 23, and zinc dropped from 240 to 180. It can b...

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PUM

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Abstract

The invention relates to a harmless treatment agent for waste drilling fluid and mainly solves the problem that secondary pollution is easily caused since harmful substances cannot be removed basically by the conventional waste drilling fluid curing treatment method. The harmless treatment agent for the waste drilling fluid comprises the following components in percentage by weight: 1.0-1.5 percent of a pH modifier, 0.7-1.0 percent of a heavy metal remover, 2.0-2.5 percent of an oxide remover, 1.5-2.0 percent of a flocculating agent, 0.05-0.1 percent of a coagulant aid and 2.0-2.5 percent of a decolorizer. After treatment of the harmless treatment agent for the waste drilling fluid, the liquid phase of the product can be used as oil field injection water, and the solid phase of the product can be used for well field paving, and well drainage highway maintenance, so that recycling of waste is realized.

Description

technical field [0001] The invention relates to a treatment agent in the field of oilfield drilling fluid technology, in particular to a harmless treatment agent for waste drilling fluid. Background technique [0002] Abandoned drilling fluid is mainly composed of clay, weighted materials, various chemical treatment agents, water, oil and drilling cuttings. With the progress of the chemical industry, especially the development of synthetic polymer chemistry, a large number of new synthetic polymers have been used as Drilling fluid treatment agents make drilling fluid more and more potentially harmful to the environment, and harmless treatment of drilling fluid has become an important part of the environmental protection work of various oilfields. The existing harmless treatment of waste drilling fluid is limited to the "solidification" treatment of waste drilling fluid, such as adding Portland cement, silica fume, fly ash and other substances, focusing on changes in physical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/66C02F1/62C02F1/52C02F1/56C02F1/58C02F103/10
Inventor 乔金安张瑞军刘红波
Owner BEIJING AOYIER ENG TECH
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