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Method for treating waste mud of drilling well by harmless process

A harmless treatment and waste mud technology, applied in the direction of oxidized water/sewage treatment, dehydration/drying/thickened sludge treatment, neutralized water/sewage treatment, etc., can solve the problems of high treatment costs and environmental pollution

Active Publication Date: 2007-04-11
NANCHONG ZHENGDA INST OF CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a harmless treatment method for drilling waste mud in order to overcome the deficiencies of the prior art, so as to solve the problems of high treatment cost and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: The steps of the harmless treatment method for drilling waste mud are as follows:

[0018] A, stirring in the mud pool adds the industrial hydrochloric acid (volume percentage) of waste mud volume 1.5% (31% concentration) and neutralizes sodium hydroxide and sodium carbonate in the waste mud, and complexes metal ions in the mud;

[0019] B. Add 0.2% bleaching powder (weight / volume percentage) of the waste mud volume to remove or reduce the organic matter content in the waste mud and reduce COD Cr and chroma, remove sulfide in mud;

[0020] C. Add 2% sodium polysilicate (weight / volume percentage) of the waste mud volume to the stirring process to absorb the water in the waste mud, destroy the emulsion balance of the waste mud, change the performance of the mud, prevent the pollutants from penetrating outwards, and form powder Shaped or massive solid.

Embodiment 2

[0021] Embodiment 2: The steps of the harmless treatment method for drilling waste mud are as follows:

[0022] A, stirring in the mud pool adds the industrial sulfuric acid (volume percentage) of waste mud volume 0.8% (98% concentration) to neutralize sodium hydroxide and sodium carbonate in the waste mud, and complex metal ions in the mud;

[0023] B. Add 0.1% hydrogen peroxide (volume percentage) of the waste mud volume to remove or reduce the organic matter content in the waste mud and reduce COD Cr and chroma, remove sulfide in mud;

[0024] C. Add 0.5% aluminum sulfate (weight / volume percentage) of the waste mud volume to the stirring process to absorb the water in the waste mud, destroy the emulsion balance of the waste mud, change the performance of the mud, prevent pollutants from penetrating outward, and form powder or block shaped solid.

Embodiment 3

[0025] Embodiment 3: The steps of the harmless treatment method for drilling waste mud are as follows:

[0026] A, stirring in the mud tank adds the industrial oxalic acid (weight / volume percentage) of waste mud volume 1.3% (98% concentration) and neutralizes sodium hydroxide and sodium carbonate in the waste mud, and complexes metal ions in the mud;

[0027] B. Add 0.2% sodium hypochlorite (weight / volume percentage) of waste mud volume during stirring to remove or reduce the organic matter content in waste mud and reduce COD Cr and chroma, remove sulfide in mud;

[0028] C. Add 0.5% of the waste mud volume alum (weight / volume percentage) to absorb the water in the waste mud, destroy the emulsion balance of the waste mud, change the performance of the mud, prevent pollutants from penetrating outward, and form powder or block solid.

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PUM

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Abstract

The innocent treating process of waste drilling mud includes the following steps: 1. adding industrial hydrochloric acid, sulfuric acid and / or oxalic acid into waste drilling mud through stirring in a mud pit to neutralize sodium hydroxide and sodium carbonate and complex metal ion; 2. adding oxidant bleaching powder, hydrogen peroxide and / or sodium hypochlorite through stirring to eliminate or reduce organic matter content, lower CODCr and chroma and eliminate sulfide; and 3. adding adsorbent polysodium silicate, aluminum sulfate, gypsum powder and / or magnesia through stirring to adsorb water, destroy emulsion balance of mud, alter mud performance, block outward penetration of pollutant and form solid. The present invention has relatively low treatment cost.

Description

technical field [0001] The invention relates to a treatment method for waste drilling mud, in particular to a harmless treatment method for waste drilling mud. Background technique [0002] Drilling waste mud is a kind of waste developed by the oil and gas industry. It is often stored in the mud pool of the drilling site for a long time or buried deep underground after general treatment. These methods need to occupy a lot of land because they have not been harmlessly treated. Seriously pollute the atmosphere, soil, and groundwater resources, resulting in a huge waste of resources. Although some domestic oil and gas fields adopted cement-based solidification methods, lime-based solidification methods, and organic polymer solidification methods to treat waste mud after the 1980s, there are still the following problems: [0003] 1. The sodium hydroxide and sodium carbonate in the waste mud are not neutralized with acid or a sufficient amount of acid, so that the pH value of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/72C02F11/14
Inventor 廖中健
Owner NANCHONG ZHENGDA INST OF CHEM ENG
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