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Comprehensive Control Method of Oilfield Pollutants

A technology for comprehensive treatment of pollutants, applied in chemical instruments and methods, multi-stage treatment of water/sewage, water/sludge/sewage treatment, etc. The method is simple, the application value is large, and the operation is convenient.

Inactive Publication Date: 2019-03-22
CHINA PETROLEUM & CHEM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the problems of high transportation costs of oilfield boiler coal ash, oil well acidizing fluid, and fracturing fluid, and difficulty in on-site treatment, to provide a comprehensive treatment method for oilfield pollutants

Method used

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  • Comprehensive Control Method of Oilfield Pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method proceeds as follows:

[0026] a. Add water to the oil well acidizing fluid to adjust the pH value to 3;

[0027] b. Take the oil well acidizing fluid and boiler coal ash in step a and add them to the reactor according to the ratio of oil well acidizing fluid: boiler coal ash = 3:1 by weight, react at 130°C for 3 hours, then settle for 3 hours, and take out the reaction The solid impurities at the bottom of the reactor are used for standby, and the supernatant is left in the reactor;

[0028] c. Slowly add sodium hydroxide solution to the solution under stirring in the b step reactor, adjust the pH value to 3, then leave it for 60 hours to obtain an aluminum ferric chloride solution;

[0029] d. Take the ferric aluminum chloride solution in step c and slowly add it to the fracturing fluid under stirring, stop adding the ferric aluminum chloride solution after flocs appear in the fracturing fluid, continue stirring for 10 minutes, and then remove the solid imp...

Embodiment 2

[0031] The method proceeds as follows:

[0032] a. Add water to the oil well acidizing fluid to adjust the pH value to 2;

[0033] b. Take the oil well acidizing fluid and boiler coal ash in step a and add them to the reactor according to the ratio of oil well acidizing fluid: boiler coal ash = 5:1 by weight, react at 80°C for 5 hours, then settle for 1 hour, and take out the reaction The solid impurities at the bottom of the reactor are used for standby, and the supernatant is left in the reactor;

[0034] c. Slowly add sodium hydroxide solution to the solution under stirring in the b step reactor, adjust the pH value to 5, then leave it for 24 hours to obtain an aluminum ferric chloride solution;

[0035] d. Take the ferric aluminum chloride solution of step c and slowly add it to the fracturing fluid under stirring, stop adding the ferric aluminum chloride solution after flocs appear in the fracturing fluid, continue stirring for 20 minutes, and then remove the solid impur...

Embodiment 3

[0037] The method proceeds as follows:

[0038] a. Add water to the oil well acidizing fluid to adjust the pH value to 3;

[0039] b. Take the oil well acidizing fluid and boiler coal ash in step a and add them to the reactor according to the ratio of oil well acidizing fluid: boiler coal ash = 4:1 parts by weight, react at 100°C for 4 hours, then settle for 2 hours, and take out the reaction The solid impurities at the bottom of the reactor are used for standby, and the supernatant is left in the reactor;

[0040] c. Slowly add sodium hydroxide solution to the solution under stirring in the b step reactor, adjust the pH value to 4, then leave it for 42 hours to obtain an aluminum ferric chloride solution;

[0041] d. Take the ferric aluminum chloride solution in step c and slowly add it to the fracturing fluid under stirring, stop adding the ferric aluminum chloride solution after flocs appear in the fracturing fluid, continue stirring for 10-20 minutes, and then pour the so...

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Abstract

The invention provides a comprehensive treatment method for oil field pollutants. The method comprises the following steps: a, adding water to adjust the pH value of an oil well acidifying liquid to 2 to 3; b, adding the oil well acidifying liquid obtained in the step a and coal ash in a boiler in a weight ratio of 3-5: 1 into a reactor, carrying out a reaction at 80 to 130 DEG C for 3 to 5 h, then carrying out settling for 1 to 3 h, taking out solid impurities in the bottom of the reactor for subsequent usage and leaving supernatant in the reactor; c, slowly adding a sodium hydroxide solution into a solution in the container obtained in step b, adjusting a pH value to 3 to 5 and then carrying out standing for 24 to 60 h so as to obtain an aluminum ferric chloride solution; and d, slowly adding the aluminum ferric chloride solution obtained in the step c into a fracturing fluid undergoing stirring, stopping addition of the aluminum ferric chloride solution when floc occurs in the fracturing fluid, continuing stirring for 10 to 20 min, then adding the solid impurities obtained in the step b according to a mass ratio of solid impurities to fracturing fluid of 2-4: 8-10, continuing stirring for 2 to 3 h, then carrying out standing, delivering obtained supernatant to an oil field sewage pipe net or leaving the supernatant for dilution of the acidifying liquid, and discharging sediment into a sludge desiccation tank.

Description

technical field [0001] The invention relates to the technical field of oilfield pollutant treatment, in particular to a comprehensive treatment method for oilfield pollutants. Background technique [0002] At present, steam flooding is widely used in heavy oil blocks in domestic oilfields, and coal-fired steam injection boilers are widely used, which produces a large amount of boiler coal ash every year. The main components of coal ash are silica, alumina and other substances, of which the silica content is about 60%-70%, and the alumina content is about 25%-35%. At present, coal ash from remote oilfields is mainly used for paving roads and laying foundations, which inevitably produces dust pollution. [0003] A large amount of acidizing fluid is produced in the acidizing operation of oil wells in the oil field. The main components of the acidizing fluid are hydrofluoric acid and hydrochloric acid, and the pH value is generally less than 1. At present, oilfield acidizing f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F11/12
Inventor 邹京伦贾雯雯陈丽华鞠巍汪文英马晓蕾王劭翡吴晓东樊娜王涛吴虹刘东
Owner CHINA PETROLEUM & CHEM CORP