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Method for processing oil-gas field fracturing waste liquor

A technology for fracturing waste fluid and treatment method, applied in chemical instruments and methods, adsorption water/sewage treatment, neutralization water/sewage treatment, etc.

Active Publication Date: 2008-11-12
PUYANG TIANDIREN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the fracturing flowback waste liquid system, it is difficult to deal with the reinjection standard or meet the discharge standard, which has become a difficult problem restricting the sustainable development of oil and gas fields.

Method used

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  • Method for processing oil-gas field fracturing waste liquor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019]Example 1: The total iron content of the fracturing waste fluid recovered by the Daniudi Gas Field Waste Fluid Centralized Treatment Station of Sinopec North China Branch is 89mg / L, the pH value is 5, and the COD content is 12000mg / L. Add 30% concentration of H to the waste 2 o 2 Stir the solution at 2%, react in the reaction tank for 5 hours, use an air compressor to feed air into the reaction tank for 10 hours, first add lime milk to adjust the pH value to 8, add amphoteric polyacrylamide 7ppm after stirring, and enter the sedimentation tank after stirring Settling, the supernatant of the settling tank overflows into the buffer tank, is lifted by the sewage pump into the fine filter and then filtered through two-stage activated carbon, and the effluent reaches the water injection standard and is reinjected into the safe formation. The settled sludge in the system is dehydrated and biscuitized by the filter press to make bricks, and the filtrate is returned to the reac...

example 2

[0020] Example 2: The fracturing waste liquid recovered from the fracturing waste liquid centralized treatment station of Sinopec Henan Oilfield Branch has a ferrous iron content of 58 mg / l, a pH value of 9, and a COD content of 8900 mg / L. Add dilute sulfuric acid to the waste liquid to adjust the pH value to 4 , add 30% concentration of H to the waste liquid 2 o 2 Stir the solution at 3%, react in the reaction tank for 6 hours, use an air compressor to feed air into the reaction tank for 24 hours, add aluminum sulfate solution to the treated sewage, and stir to make the pH value between 6 and 9 , Stirring rate is 30r / min, add amphoteric polyacrylamide 7ppm and stir, stop stirring when alum flowers are formed, settle for more than 50min, supernatant overflows into the buffer pool, lifts into the fine filter through the sewage pump, and then filters through two-stage activated carbon , the effluent reaches the discharge standard. The settled sludge in the system is dehydrated...

example 3

[0021] Example 3: The fracturing waste fluid recovered by the Centralized Treatment Station of Fracturing Waste Fluid at the No. 1 Oil Production Plant of Tahe Oilfield of Sinopec Northwest Branch has a ferrous iron content of 46 mg / L, a pH value of 3, and an oil content of 400 mg / L. Use the jet pump to circulate the jet flow into the air for 48 hours, add the milk of lime solution to the treated sewage first, stir to make the pH value between 6 and 9, and the stirring rate is 30r / min, add amphoteric polyacrylamide 7ppm and stir, When the alum flowers are formed, stop stirring and settle for more than 6 hours. The supernatant overflows into the buffer tank, is lifted by the sewage pump into the fine filter, and then filtered through two-stage activated carbon. The effluent oil, pH value, and suspended matter meet the specified standards. The settled sludge in the system is dehydrated and biscuitized by the filter press to make bricks, and the filtrate is returned to the reactio...

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Abstract

The invention provides a method for treating fracturing waste fluid in an oil-gas field, belonging to the oil-gas field waste fluid treatment technology, which overcomes the problems existed in other methods. The process steps of the method are as follows: the water quality achieves a recirculation standard or accords with the II grade discharge standard of the integrated sewage discharge standard GB8978-1996, through technical treatments of raw water (pH) adjustment, H2O2 / Fe<2+> catalytic oxidation, chemical precipitation, enhanced flocculation and sedimentation, fine filter and adsorption filtration, and system settling sludge, then the settled sludge is subject to filter pressing and dehydrating, press filtrate returns to the front end for after-treatment, and mud cake is desiccated and manufactured into bricks for application or is treated through using the incinerating treatment technology. The method is an effective method for treating the fracturing waste fluid in the oil-gas field.

Description

1. Technical field: [0001] The invention relates to oil and gas field waste liquid treatment technology, in particular to a treatment method for oil and gas field fracturing waste liquid. 2. Background technology: [0002] The fracturing process is an important measure to increase production in oil and gas fields. It is mainly used to improve the permeability of oil and gas layers and remove plugging. It plays an irreplaceable role in new well testing, oil well tapping in old areas, and single well stimulation. Therefore, it is widely used. However, the flowback fracturing waste fluid generated during the fracturing operation is a pollution source that cannot be ignored in oil fields. After fracturing a single well, the flowback fracturing waste fluid ranges from hundreds to thousands of cubic meters. Different oil and gas fields, different well depths, formations, fracturing fluid system characteristics and construction operation techniques are different. Therefore, the na...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F1/72C02F1/28
Inventor 郭学峰宋国波茆明军李伟平王成全梁世峰
Owner PUYANG TIANDIREN ENVIRONMENTAL PROTECTION TECH CO LTD
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