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Demulsifier composition and method for demulsifying raw oil containing acidified oil

A technology of composition and demulsifier, which is applied in the field of demulsifier composition, can solve the problems of high current of electric dehydrator, increased dosage of demulsifier, poor demulsification effect, etc., so as to speed up water separation and improve water quality , Improve the effect of demulsification effect

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems are that the demulsification and water separation time is longer, the amount of demulsifier is increased, the water content of the crude oil after dehydration is not up to the standard, the electric dehydrator trips frequently and cannot work normally, and the oil content in the evacuated water is high, making subsequent treatment more difficult , these have seriously affected the processing capacity of acidified crude oil
[0004] At present, many literatures on the treatment method of acidified oil are the combination of alkalizing agent and demulsifier. According to the principle of acid-base neutralization, alkaline substances are added to acidified crude oil to neutralize the acid. The added alkalizing agent includes sodium hydroxide, carbonic acid, etc. Sodium hydrogen, sodium carbonate, ammonia water, etc. Among them, sodium carbonate is the most commonly used. Generally, the pH value is neutralized to about neutrality, and then demulsifier is added to demulsify and dehydrate. The disadvantage of this method is that the alkalinizing agent is a strong alkali, Inorganic strong electrolytes such as weak bases or strong bases and weak salts are insoluble in the oil phase and are not easy to enter the oil phase for reaction, which will lead to high current in the electric dehydrator and affect the normal operation of the device
In addition, asphaltenes, colloids and Fe-containing 3+ The residual acid is adsorbed and aggregated, and the demulsification effect of the combination of simple alkaline substances and demulsifiers is not good

Method used

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  • Demulsifier composition and method for demulsifying raw oil containing acidified oil
  • Demulsifier composition and method for demulsifying raw oil containing acidified oil
  • Demulsifier composition and method for demulsifying raw oil containing acidified oil

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preparation example Construction

[0022] The preparation method of the demulsifier composition provided by the present invention is relatively simple, and only needs to mix each component uniformly.

[0023] The present invention also provides a method for demulsifying acidified oil, the method comprising: using the demulsifier composition provided by the present invention to perform demulsification treatment on raw oil containing acidified oil.

[0024] The feed oil containing acidified oil may be a mixed feed oil blended with acidized oil and conventional crude oil, or may be a single acidized oil. In the raw oil containing acidified oil, based on the total weight of the raw oil containing acidified oil, the content of acidified oil may be 10-100% by weight. Since acidified oil is an extremely inferior crude oil, the amount of the demulsifier composition is generally relatively large. Usually, the amount of the demulsifier composition may be 20-1000 μg, preferably 100-500 μg, per gram of the acidified oil-c...

Embodiment 1

[0033] This example is used to illustrate the demulsifier composition provided by the present invention and the demulsification method of raw oil containing acidified oil.

[0034] (1) Preparation of demulsifier composition

[0035] 40 parts by weight of polyether surfactant (the number average molecular weight is 12600, the mass ratio of EO / PO is 0.45, the initiator is diethylenetriamine, purchased from Shandong Binhua Group Auxiliary Company), 40 Parts by weight of 2-formamidoethylpentadecylimidazoline (sourced from Northwest Oilfield Branch of China Petrochemical Corporation) and 20 parts by weight of methanol were evenly mixed to prepare demulsifier composition A1.

[0036] (2) Demulsification treatment

[0037] Use the demulsifier composition to demulsify acidified oil (relevant parameters are shown in Table 1). The specific treatment process is as follows: after preheating the acidified oil in an oven at 85°C for a period of time, add about 20 g to the sample bottle, A...

Embodiment 2

[0046] This example is used to illustrate the demulsifier composition provided by the present invention and the demulsification method of raw oil containing acidified oil.

[0047] (1) Preparation of demulsifier composition

[0048] 40 parts by weight of polyether surfactant (the number average molecular weight is 6200, the mass ratio of EO / PO is 0.89, the initiator is triethylenetetramine, purchased from Shandong Binhua Group Auxiliary Company), 35 parts by weight Parts of 2-aminoethyl heptadecyl imidazoline (from Northwest Oilfield Branch of China Petrochemical Corporation) and 25 parts by weight of ethanol were evenly mixed to prepare demulsifier composition A2.

[0049] (2) Demulsification treatment

[0050] This demulsifier composition is used to demulsify the mixed crude oil blended with acidified oil (relevant parameters are shown in Table 1) and conventional crude oil, wherein the weight percentage of acidified oil is 40%, and the specific treatment process is as foll...

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Abstract

The invention relates to a demulsifier composition, wherein the composition contains a polyether surfactant, an imidazoline surfactant and alcohol, the polyether surfactant is a polyoxyethylene and polyoxypropylene two-block or multi-block polyether using organic amine as an initiator, and the imidazoline surfactant is homolog using nitrogen containing five membered heterocycle of imidazoline as a substrate. The invention also relates to an acid oil-containing raw oil demulsification method using the demulsifier composition, in the acid oil-containing raw oil demulsification process, better demulsification effect can be obtained by use of the demulsifier composition, and the dosage of demulsifier composition can be reduced.

Description

technical field [0001] The invention relates to a demulsifier composition and a method for demulsifying raw material oil containing acidified oil by using the demulsifier composition. Background technique [0002] In recent years, international crude oil prices have continued to fluctuate at high levels, and oil demand has continued to rise. Stimulated by high oil prices, how to improve oil recovery has become a hot spot in development. Therefore, the world is increasingly dependent on oilfield chemicals. The role of chemical agents is mainly an important means to realize oilfield reservoir transformation, crude oil production increase and residual oil recovery. Among them, the chemical agent for acidification refers to the use of acid liquid to remove pollution near the bottom of production wells, injection wells, etc., to restore the permeability of the formation or to dissolve the rock cement in the formation to increase the permeability of the formation. It mainly includ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04
Inventor 于丽沈明欢王振宇
Owner CHINA PETROLEUM & CHEM CORP