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A kind of oilfield ternary compound flooding oily sewage pretreatment agent and its treatment method

A ternary compound and pretreatment agent technology, which is applied in water/sewage treatment, water/sewage multi-stage treatment, biological water/sewage treatment, etc., can solve the problem of slow separation of sludge and water, difficulty in agglomeration, and deterioration of water quality, etc. To improve the economic and social benefits of the oil field, the system structure is simple and reasonable, and the process operation is stable

Active Publication Date: 2021-08-31
中科亿诚(珠海)环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the ASP flooding uses polyacrylamide, anionic surfactant, alkali and other chemical agents as the oil displacement system, the composition of the produced sewage is complicated and the water quality deteriorates, which are mainly manifested in: (1) The viscosity of the water increases, and the sludge water (2) The emulsification stability of water increases, and the difficulty of oil-water separation increases; (3) The negative charge of water increases, the stability of oil and suspended solids increases, and it is difficult to coalesce; (4) The water The tendency of scaling is enhanced, and it is easy to form mixed scales of calcium, magnesium and silicon; (5) The water quality is unstable, and colloidal particles containing calcium, magnesium and silicon are continuously precipitated from the water
[0004] In view of the characteristics of the above sewage, it is impossible to effectively treat the above sewage with conventional treatment technologies
Moreover, the treatment before ASP flooding and its sewage recharge is continuously operated in the long-term tertiary oil recovery process, the chemicals used will accumulate in the sewage, and the water quality will become worse and worse

Method used

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  • A kind of oilfield ternary compound flooding oily sewage pretreatment agent and its treatment method

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Effect test

Embodiment 1

[0028] An oilfield three-element compound flooding oily sewage pretreatment agent, which includes the following raw materials by mass percentage: 10% of activated carbon, 30% of bentonite, 30% of zeolite powder, 6% of aluminum sulfate, 10% of polyferric sulfate, and 4% of acetone oxime %, ferrous sulfate 10%.

[0029] In the above formula, the zeolite powder is made of the following raw materials by mass percentage: 10% silicon dioxide, 35% aluminum oxide, 5% shell, 12% construction waste, 18% clay, and 20% adhesive; The agent is made of water glass and sodium carboxymethyl cellulose in a ratio of 30%:70%. The bentonite is 300 mesh calcium-based bentonite.

[0030] The treatment method for the oily sewage of the above oilfield ASP flooding includes the following steps:

[0031] 1) The oily wastewater from ASP flooding in the oil field is transported through pipelines to the primary sedimentation tank for natural sedimentation, and the sedimentation time is 24 hours to obtain...

Embodiment 2

[0039]An oily three-element compound flooding oily sewage pretreatment agent, which comprises the following raw materials by mass percentage: activated carbon 15%, bentonite 35%, zeolite powder 20%, aluminum sulfate 8%, polyferric sulfate 11%, acetone oxime 3 %, ferrous sulfate 8%.

[0040] In the above formula, the zeolite powder is made of the following raw materials by mass percentage: 20% silicon dioxide, 25% aluminum oxide, 10% shell, 15% construction waste, 15% clay, and 15% adhesive; The agent is made of water glass and sodium carboxymethyl cellulose in a ratio of 30%:70%. Bentonite is 500 mesh sodium bentonite.

[0041] The treatment method for the oily sewage of the above oilfield ASP flooding includes the following steps:

[0042] 1) The oily wastewater from ASP flooding in the oilfield is transported through pipelines to the primary sedimentation tank for natural sedimentation, and the sedimentation time is 12 hours to obtain the first supernatant;

[0043] 2) Th...

Embodiment 3

[0050] An oilfield three-element compound flooding oily sewage pretreatment agent, which includes the following raw materials by mass percentage: 20% of activated carbon, 15% of bentonite, 40% of zeolite powder, 8% of aluminum sulfate, 8% of polyferric sulfate, and 4% of acetone oxime %, ferrous sulfate 5%.

[0051] In the above formula, the zeolite powder is made of the following raw materials by mass percentage: 20% silicon dioxide, 25% aluminum oxide, 10% shell, 15% construction waste, 15% clay, and 15% adhesive; The agent is made of water glass and sodium carboxymethyl cellulose in a ratio of 30%:70%. Bentonite is 200 mesh acid bentonite.

[0052] The treatment method for the oily sewage of the above oilfield ASP flooding includes the following steps:

[0053] 1) The oily wastewater from ASP flooding in the oil field is transported through pipelines to the primary sedimentation tank for natural sedimentation, and the sedimentation time is 48 hours to obtain the first sup...

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Abstract

The invention discloses an oilfield three-element compound flooding oily sewage pretreatment agent and a treatment method thereof, belonging to the technical field of sewage treatment. The pretreatment agent includes the following raw materials in terms of mass percentage: 5-20% of activated carbon, 10-50% of bentonite, 10-50% of zeolite powder, 3-15% of aluminum sulfate, 5-35% of polyferric sulfate, and 1% of acetone oxime. ~10%, ferrous sulfate 5~20%. The pretreatment agent and its treatment method can effectively treat the oily sewage of oilfield ASP flooding, meet the requirements of reinjection water after treatment, save water resources, protect the oilfield environment, have high treatment efficiency, relatively small dosing amount, stable process operation, and reduce Oilfield ASP flooding sewage treatment costs, improve oilfield economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an oilfield three-element compound flooding oily sewage pretreatment agent and a treatment method thereof. Background technique [0002] Oil exploitation has a history of more than 100 years. For a long time, it has been extracted in two stages: the first is to use the high-temperature and high-pressure injection in the oil field at a depth of 1,500 to 5,000 meters underground; Leakage and decompression, can only utilize electric motor--crank connecting rod structure--" kowtow machine " of piston pump form to pump oil; Two times of oil recovery can only be produced 40~60%. At present, in order to meet the increasing demand for oil, my country has created the ASP flooding oil recovery technology in the oil extraction method after ten years of hard work. ASP flooding refers to a new technology of tertiary oil recovery that prepares surfactant-alkali-polymer three types of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F1/28C02F1/52C02F9/14C02F103/10
CPCC02F1/00C02F1/24C02F1/281C02F1/283C02F1/40C02F1/52C02F1/5245C02F1/5281C02F3/30C02F3/34C02F9/00C02F2103/10C02F2209/08C02F2209/10C02F2301/08
Inventor 张友良
Owner 中科亿诚(珠海)环保技术有限公司