Multifunctional water treatment agent for oilfield reinjection water

A technology of oil field reinjection water and water treatment agent, which is applied in water/sludge/sewage treatment, sterilization/microdynamic water/sewage treatment, mining wastewater treatment, etc. , It is difficult to achieve satisfactory corrosion inhibition effect, etc., to achieve the effects of good compatibility, promotion of environmental protection, and simple configuration

Inactive Publication Date: 2011-11-30
天津市科达斯实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current oilfield water treatment agents still have a series of problems: for example, with the research and development of oilfield slow-release agents, it is found that it is difficult to achieve a satisfactory corrosion inhibition effect by relying on only one component, and the corrosion inhibitors used in the oil industry are often used It is the compounding of several corrosion-inhibiting ingredients according to a certain ratio, and the corro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of multifunctional water treatment agent-1 for oilfield reinjection water: 15% polymaleic anhydride, 5% sodium gluconate, 10% heptadecyl imidazoline, 10% octadecyl imidazoline, 5% Octadecylamine, 6% polyethylene oxide octadecylamine, 20% dodecyldimethylbenzyl ammonium chloride, 5% dodecyl imidazoline, 5% undecyl imidazoline, 5% deca Dialkylimidazoline and 14% deionized water are placed in a container at room temperature and stirred evenly to obtain the multifunctional water treatment agent of the present invention.

[0034] The water quality of this multi-functional water treatment agent-1 was tested in Panyu reinjection water, and the water quality is as follows:

[0035] project Cl-(mg / L) Ca2+(mg / L) Mg2+(mg / L) Total alkali (mmol / L) result 19000 1080 224.06 6.54

[0036] Add the multi-functional water treatment agent-1 agent used for oilfield reinjection water to the above water quality at 30ppm, and conduct a static c...

Embodiment 2

[0038] Preparation of multifunctional water treatment agent-2 for oilfield reinjection water: 10% polymaleic anhydride, 8% sodium gluconate, 18% octadecyl imidazoline, 4% hexamethylenetetramine, 6% Polyethylene oxide octadecylamine, 20% dodecyl dimethyl benzyl ammonium chloride, 5% dodecyl imidazoline, 5% undecyl imidazoline, 5% dodecyl imidazoline, 19% deionized water was placed in a container at room temperature and stirred evenly to obtain the multifunctional water treatment agent of the present invention.

[0039] This multi-functional water treatment agent-2 was tested in Xijiang water quality, the water quality is as follows:

[0040] project Cl-(mg / L) Ca2+(mg / L) Mg2+(mg / L) Total alkali (mmol / L) result 16000 720 193.06 14.52

[0041] Add the multifunctional water treatment agent-2 agent used for oil field reinjection water into the above water quality at 30ppm, and conduct static coupon tests. The uniform corrosion rate of A3 carbon...

Embodiment 3

[0043] Preparation of multifunctional water treatment agent-3 for oilfield reinjection water: 15% polymaleic anhydride, 5% sodium gluconate, 5% heptadecyl imidazoline, 20% octadecyl imidazoline, 5% Octadecylamine, 6% polyethylene oxide octadecylamine, 15% dodecyldimethylbenzylammonium chloride, 5% tetradecyldimethylbenzylammonium chloride, 4% tridecyl imidazoline base, 4% tetradecyl imidazoline, and 16% deionized water are placed in a container at room temperature and stirred evenly to obtain the multifunctional water treatment agent of the present invention.

[0044] This multifunctional water treatment agent was tested in a certain water quality abroad, and the water quality is as follows:

[0045] project Cl-(mg / L) Ca2+(mg / L) Mg2+(mg / L) Total alkali (mmol / L) result 19000 1225.9 318.3 11.8

[0046] The multi-functional water treatment agent-3 agent used for oil field reinjection water was added to the above water quality at 30ppm, and t...

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Abstract

The invention relates to a multifunctional water treatment agent for oilfield reinjection water. The water treatment agent comprises the following components in percentage by weight: 13 to 27 percent of scale inhibition component consisting of 8 to 15 percent of polymaleic anhydride and 5 to 12 percent of sodium gluconate, 21 to 41 percent of corrosion inhibition component consisting of 15 to 25 percent of imidazoline derivative A, 3 to 8 percent of organic amine salt and 3 to 8 percent of polyethylene oxide octadecylamine, 18 to 40 percent of sterilization component consisting of 10 to 25 percent of alkyl quaternary ammonium salt and 8 to 15 percent of imidazoline derivative B, and the balance of deionized water. The water treatment agent is suitable for treating the oilfield reinjectionwater in an oxygen-free system, and also has a good effect on reinjection water containing CO2 and H2S; and the reinjection water is not required to be pretreated, and only the prepared multifunctional water treatment agent is needed to be added into a pipe network of a reinjection water system according to required concentration.

Description

technical field [0001] The invention relates to a water treatment agent. In particular, it relates to a multi-functional water treatment agent for oil field reinjection water with functions of sterilization, scale inhibition and corrosion inhibition Background technique [0002] At present, most oilfields in my country have adopted the water injection development method. On average, about 2t-3t of water is required to produce 1t of crude oil, which increases the water content of crude oil and greatly increases the amount of sewage separated during crude oil treatment. The crude oil produced in my country's oil fields contains 70% to 95% water, and the ratio of oil to water is gradually increasing. In multiple oil recovery in oil fields, the liquid produced from the oil well is separated from the oil and water phases by the separator, the oil phase is transported to the oil transfer station, and the water phase is transported to the sewage treatment station. In the sewage t...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F1/50C02F103/10
Inventor 龚秋鸣张建刘志厉明蓉田慧茹周若
Owner 天津市科达斯实业有限公司
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