Waste drilling mud treatment method

A treatment method and technology for drilling mud, applied in chemical instruments and methods, drilling composition, solid separation, etc., can solve problems such as poor mud stability, and achieve the effects of environmental friendliness and good economic benefits

Active Publication Date: 2015-03-25
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the characteristics of a large amount of drill cuttings powder and high content of soluble salt in the waste drilling mud, the present invention utilizes the method of flotation separation to preliminarily separate barite, and then further surface-modifies the barite after flotation , to overcome the disadvantage of poor mud stability when reclaimed barite is reused, and the performance of the mud prepared by using the barite recovered by this method is basically the same as that of the mud prepared by using new barite
The drill cuttings residue and waste liquid sludge produced after the recovery of barite by the present invention are mixed and ground and then re-injected into the formation, which solves the problem of mud waste treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Shengli Oilfield Waste Drilling Mud 150m 3 , 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 stir well, until the pH of the drilling cuttings Up to 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 introduce the mud into the buoy under stirring conditions. Carry out flotation in the selection pond, through 5d, obtain barite powder 47 tons, add 50kg polyethylene glycol, quaternary ammonium salt 100kg carry out modification, promptly obtain the barite powder that can reuse, the barite powder that reclaims is used for Preparation of drilling mud To prepare new drilling mud, the drill cuttings obtained and the wastewater sludge produced by flotation are mixed, ground to a particle size of less than 3m...

Embodiment 2

[0023] Shengli Oilfield Waste Drilling Mud 210m 3 , 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 15% into the reaction kettle, and stir well, until the pH of the drilling cuttings Until it 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 introduce the mud into the buoy under stirring conditions. Carry out flotation in the selection pond, through 5d, obtain barite powder 61 tons, add 60kg polyethylene glycol, quaternary ammonium salt 60kg carry out modification, promptly obtain the barite powder that can reuse, the barite powder that reclaims is used for Preparation of drilling mud To prepare new drilling mud, the drill cuttings obtained and the wastewater sludge produced by flotation are mixed, ground to a particle size of...

Embodiment 3

[0025] Huabei oilfield waste drilling mud 100m 3 , after removing the larger debris, use a 20-mesh sieve to separate the larger drill cuttings in the mud, add sulfuric acid with a concentration of 25% into the reaction kettle, and stir well, until the pH of the drill cuttings Up to 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. Carry out flotation in the selection pond, through 7d, obtain barite powder 25 tons, add 30kg polyethylene glycol, quaternary ammonium salt 60kg carry out modification, promptly obtain the barite powder that can reuse, the barite powder that reclaims is used for Preparation of drilling mud To prepare new drilling mud, the drill cuttings obtained and the wastewater sludge produced by flotation are mixed, ground to a particle size of less than 3mm, and then injected back into the formation.

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Abstract

The invention discloses a waste drilling mud treatment method. Aiming at the characteristics that waste drilling mud contains a lot of drillings powder and is relatively high in soluble salt content, barite is primarily separated out by using a flotation separation method; the floated barite is further subjected to surface modification, so that the barite completely adapts to re-configuration of the drilling mud; and the drillings generated in the barite separation process are mixed with waste liquid sludge, and then are re-injected into stratum after being ground. The method disclosed by the invention has the characteristics of environmental friendliness and good economic benefits.

Description

technical field [0001] The invention belongs to the field of drilling waste treatment, in particular to a treatment method for waste drilling mud. Background technique [0002] Drilling waste is composed of drilling waste mud, wastewater generated by drilling, and 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, the harmless treatment of waste drilling mud 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 (mainly barite, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C09K8/16C09K8/03B03D1/018B03D101/02B03D101/06
Inventor 邢青松惠学芹咸斌朱效波高翠芳
Owner YANCHENG INST OF TECH
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