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Method of recovering barite from waste drilling mud

A drilling mud, barite technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of incomplete separation and high operating costs, and achieve the effects of low cost and improved efficiency

Active Publication Date: 2015-05-13
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the problems of high operating cost and incomplete separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Shengli Oilfield waste drilling mud 150m3, after removing the larger debris, use a 20-mesh sieve to separate the larger drilling cuttings in the mud, add sulfuric acid with a concentration of 30% in the reaction kettle, and fully stir, When the pH value of the cuttings reaches 6, add appropriate amount of water to control the density of the mud at 1.25g / ml, add 150kg of water glass, 45kg of oleic acid, 45kg of sodium dodecylsulfonate, and 15kg of citric acid, and then stir Under the conditions, the mud is introduced into the flotation tank for flotation. After 5 days, 47 tons of barite powder are obtained, and 50kg of polyethylene glycol and 100kg of quaternary ammonium salt are added for modification to obtain reusable barite powder. The purity of spar powder is 95%.

Embodiment 2

[0023] The waste drilling mud of Shengli Oilfield is 210m3. After removing the larger debris, the larger cuttings in the mud are separated by sieve with 20 meshes. When the pH value of the cuttings reaches 6.5, add appropriate amount of water to control the density of the mud at 1.3g / ml, add 210kg of water glass, 90kg of oleic acid, 50kg of sodium dodecylsulfonate, and 20kg of citric acid, and then stir Under the conditions, the mud is introduced into the flotation tank for flotation. After 5 days, 61 tons of barite powder are obtained, and 60kg of polyethylene glycol and 60kg of quaternary ammonium salt are added for modification to obtain reusable barite powder. The purity of stone powder is 94%.

Embodiment 3

[0025] Huabei oilfield waste drilling mud 100m3, after removing the larger debris, use a 20-mesh sieve to separate the larger drilling cuttings in the mud, add sulfuric acid with a concentration of 25% in the reaction kettle, and fully stir, When the pH value of the cuttings reaches 6, add an appropriate amount of water to control the density of the mud at 1.27g / ml, add 120kg of water glass, 50kg of oleic acid, 40kg of sodium dodecylsulfonate, and 10kg of citric acid, and then stir Under the conditions, the mud is introduced into the flotation tank for flotation. After 7 days, 25 tons of barite powder are obtained, and 30kg of polyethylene glycol and 60kg of quaternary ammonium salt are added for modification to obtain reusable barite powder. The purity of stone powder is 95%.

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Abstract

The present invention improves a traditional flotation separation beneficiation method by directing to a feature that waste drilling mud contains a large amount of drilling cutting power and a high content of soluble salt. By adjusting pH value of waste liquid and optimizing a flotation additive, the flotation efficiency can be improved. By using the method provided by the present invention, cost is low, and the purity of recovered barite can reach more than 90%, so that the recovered barite can be re-used in the preparation of the drilling mud.

Description

technical field [0001] The invention belongs to the field of drilling waste treatment, in particular to a method for recovering barite from waste drilling mud. Background technique [0002] Drilling waste is composed of drilling waste mud, drilling wastewater and drilling cuttings. It has the characteristics of high content of oil, suspended solids, heavy metal ions, large changes in water content, and difficult dehydration. It is currently one of the main pollution sources of oil and gas fields. If the drilling waste is discharged directly, it will affect the growth of crops, and after long-term stacking, it will seep into the soil and further pollute the groundwater. Therefore, its harmless treatment has attracted more and more attention. Drilling mud varies with the needs of drilling technology and geological conditions. The domestic drilling mud is mainly a multiphase stable system composed of clay, drilling cuttings, weighting materials (barite, cement, etc.), chemica...

Claims

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Application Information

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IPC IPC(8): C01F11/46
Inventor 邢青松惠学芹咸斌朱效波高翠芳
Owner YANCHENG INST OF TECH
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