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Method for treating alkaline surfactant polymer flooding oil-field wastewater

A technology of oil production wastewater and three-element compounding, applied in chemical instruments and methods, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of no three-element compound flooding oil production wastewater treatment technology, etc., and achieve good results Adaptability, improvement of processing efficiency, and reduction of processing costs

Inactive Publication Date: 2011-04-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no suitable ASP flooding wastewater treatment technology in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take 1000mL of ASP flooding wastewater from an oilfield. After water quality analysis, the oil content is 728mg / L, the pH value is 10.5 (in line with the treatment conditions, no adjustment is required), and the suspended solids are 264mg / L. Add white mud treatment agent to the sewage at a rate of 7500mg / L, maintain the stirring speed at 250r / min, stir for 10min, then let it settle for 15min, then filter it through quartz sand, conduct water quality analysis, and confirm that it meets the SY / T5329-94 standard for injection water , and the water quality is stable. The results of this embodiment are shown in the table below:

[0014]

Embodiment 2

[0016] Take 1000mL of ASP flooding wastewater from an oilfield. After water quality analysis, the oil content is 1035mg / L, the pH value is 11.5 (in line with the treatment conditions and does not need to be adjusted), and the suspended solids are 365mg / L. Add white mud treatment agent to the sewage at a rate of 9500mg / L, maintain the stirring speed at 250r / min, stir for 5min, then let it settle for 20min, then filter it through quartz sand, analyze the water quality, and confirm that the injected water meets the SY / T5329-94 standard. And the water quality is stable. The results of this embodiment are shown in the table below:

[0017]

Embodiment 3

[0019] Take 1000mL of ASP flooding wastewater from an oilfield. After water quality analysis, the oil content is 635mg / L, the pH value is 8.5, and the suspended matter is 365mg / L. Use sodium carbonate to adjust the pH to 9, add white mud treatment agent to the sewage at a rate of 8000mg / L, stir at a cone speed of 300r / min, stir for 10min, then let it settle for 30min, then filter it through quartz sand, and analyze the water quality to determine The injection water is SY / T5329-94 standard, and the water quality is stable. The results of this embodiment are shown in the table below:

[0020]

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PUM

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Abstract

The invention provides a method for treating alkaline surfactant polymer (ASP) flooding oil-field wastewater, comprising the following steps: (1) taking alkali factory waste white mud and hydrochloric acid or dilute sulphuric acid, dipping the white mud in the hydrochloric acid or the dilute sulphuric acid according to a certain proportion, filtering and obtaining the filtrate as the desired treatment agent; (2) carrying out the water quality test on the ASP flooding oil-field wastewater, regulating the pH value of the wastewater in the range of 9 to 12 by a pH regulator if the pH value of the wastewater is not in the range of 9 to 12, and then adding the prepared treatment agent to tertiary recovery wastewater according to the adding amount of 7,000 mg / L to 10,000 mg / L based on the oil content and the suspended solid content of the tertiary recovery wastewater; (3) stirring the ASP flooding oil-filed wastewater with the speed of 150 rpm -300 rpm for 2 minutes-15 minutes while adding the treatment agent, and then standing and settling for 10 minutes-30 minutes; and (4) filtering by quartz sand for executing the post-treatment. The method for treating alkaline surfactant polymer flooding oil-field wastewater has good treatment effect and reduces the treatment cost.

Description

technical field [0001] The invention relates to a method for treating waste water from three-element compound flooding and belongs to the technical field of sewage treatment. Background technique [0002] With the deepening of oil exploration, in order to ensure oil production and improve oil recovery, more and more oil fields in my country adopt tertiary oil recovery technology, among which ASP flooding is a very important flooding method. While the ASP flooding technology significantly improves oil recovery, it also inevitably brings serious negative effects. The ASP flooding wastewater contains crude oil, oil displacement agent and suspended solids at the same time, which is a complex process. Difficult to handle highly stable emulsified systems. At present, there is no suitable ASP flooding wastewater treatment technology in China. Such sewage must be treated before further use or discharge. Contents of the invention [0003] The invention aims at the shortcomings o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F9/04C02F1/52C02F1/66
Inventor 李玉江王彪吴涛孙德军
Owner SHANDONG UNIV