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Solid-liquid separation technique for waste slurry of water-based system artesian well

A technology of solid-liquid separation and process method, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage multi-stage treatment, etc.

Inactive Publication Date: 2008-09-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the prior art for the harmless treatment of waste drilling mud in the water-based system, the purpose of the present invention is to provide a new solid-liquid separation process for the waste drilling mud in the water-based system, so as to solve the problems caused by the waste drilling mud in the water-based system. The stability of the colloidal system makes it difficult to effectively separate solids and liquids and achieve harmless treatment, which cannot fundamentally solve the problem of environmental hazards caused by water-based drilling waste mud

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]The waste mud sampled is a water-based system drilling waste mud. The main components are clay, bentonite, organic polymer treatment agent, weighting material, cuttings, and mud sand and surface soil carried by sewage flowing through the ground. The appearance is viscous fluid. Brownish black, the pH value of the mud liquid is about 10, which is alkaline, and the mud density is about 1.35g / cm 3 , the solid content is high, and solid-liquid separation cannot be carried out in the natural state. In order to achieve solid-liquid separation, add water to the water-based system drilling waste mud placed in the container, and stir at the same time to adjust its density to 1.10g / cm 3 Finally, add concentrated sulfuric acid with a mass concentration of 80% while stirring, until the pH value of the slurry is adjusted to 3, acidify the gel-breaking reaction for about 15 minutes, and then put the waste mud slurry after fully acidifying the gel-breaking reaction Send to vacuum filt...

Embodiment 2

[0023] The waste mud sampled is a water-based system drilling waste mud. The main components are clay, bentonite, organic polymer treatment agent, weighting material, cuttings, and mud sand and surface soil carried by sewage flowing through the ground. The appearance is viscous fluid. Brownish black, the pH value of the mud liquid is about 11, which is alkaline, and the mud density is about 1.30g / cm 3 , the solid content is high, and solid-liquid separation cannot be carried out in the natural state. In order to achieve solid-liquid separation, add water to the water-based system drilling waste mud placed in the container, and stir at the same time to adjust its density to 1.15g / cm 3 Finally, add concentrated sulfuric acid with a mass concentration of 85% while stirring, until the pH value of the slurry is adjusted to 3, acidify and break the gel for about 15 minutes, and then pour it into the waste mud slurry after the fully acidified and broken gel While stirring, add ferro...

Embodiment 3

[0025] The waste mud sampled is a water-based system drilling waste mud. The main components are clay, bentonite, organic polymer treatment agent, weighting material, cuttings, and mud sand and surface soil carried by sewage flowing through the ground. The appearance is viscous fluid. Brownish black, the pH value of the mud liquid is about 9, which is alkaline, and the mud density is about 1.25g / cm 3 , the solid content is high, and solid-liquid separation cannot be carried out in the natural state. In order to achieve solid-liquid separation, add water to the water-based system drilling waste mud placed in the container, and stir at the same time to adjust its density to 1.15g / cm 3 Finally, add concentrated sulfuric acid with a mass concentration of 80% while stirring, until the pH value of the slurry is adjusted to 2.5, acidify the gel-breaking reaction for about 15 minutes, and then pour it into the waste mud slurry after fully acidifying the gel-breaking reaction While st...

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Abstract

The invention discloses a solid and liquid separation technique of water based system well drilling waste slurry, which includes the procedures that: (1) slurry preparation, water or well drilling wastewater is added to adjust the density of the water based system well drilling waste slurry not to be more than 1.20 g / cm<3>; (2) acidification and gelout, gel breaker sulphuric acid is added to adjust the pH value of the waste slurry after the density is adjusted not to be more than 5, and the acidification and gelout and stability elimination reaction are performed; (3) solid and liquid separation, the waste slurry liquid after being performed the full acidification and gelout and stability elimination reaction is fed into a solid and liquid separation device for the solid and liquid separation, so as to cause the solid phase and the liquid phase of the waste slurry to be separated. The solid and liquid separation technique of the water based system well drilling waste slurry provided by the invention fully solves the key technical problem that the water based system well drilling waste slurry is difficult to perform the solid and liquid separation, and establishes the reliable base for the innocent treatment of the water based system well drilling waste slurry.

Description

technical field [0001] The present invention relates to oil and gas exploration and drilling mud treatment technology, more specifically, relates to a technology for separating and treating water-based system drilling waste mud in the process of oil and gas extraction and drilling. 1. Background Technology [0002] During the extraction and drilling of oil and natural gas, a large amount of drilling waste mud will be produced. The composition of drilling waste mud is relatively complex, mainly composed of multi-phase suspended matter composed of clay, weighted materials, various chemical treatment agents, sewage, dirty oil and cuttings. Since various chemical substances are added to the mud used in the drilling process, such as synthetic polymer compounds, heavy metal ion treatment agents, etc., the polluting and harmful substances in the drilling mud seriously exceed the standard, threatening the living environment of people. With the improvement of people's living standar...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/52
Inventor 黄卫星陈晓东鲁彪钟宇朱丽李海龙
Owner SICHUAN UNIV
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