Environment-friendly demulsifier and preparation method thereof

Abstract

The invention relates to an environment-friendly demulsifier which comprises the following components in parts by weight: 10-20 parts of modified polyamine polyamine; 5-8 parts of a corrosion inhibitor; 10 to 15 parts of an auxiliary agent; 5 to 15 parts of triethanolamine; 3-8 parts of ammonia water; 5 to 8 parts of polyethylene polyamine; 5 to 10 parts of potassium hydroxide; 15 to 25 parts of propylene oxide; 20 to 30 parts of ethylene oxide; 5-10 parts of glacial acetic acid; and 2-8 parts of distilled water. The demulsifying agent has the advantages that the demulsifying agent is simple in component and can achieve the purpose of demulsification, meanwhile, the influence on the surrounding environment is small in the using process, and the environmental protection property of the demulsifying agent in use is guaranteed; the characteristics of low manufacturing cost, environment friendliness, high adaptability and corrosion resistance are realized; the crude oil water phase treated by using the demulsifier has the technical effects of low oil content, good water phase cleanliness, low water phase turbidity and clear first-level water-oil interface, the loss of the crude oil can be reduced in the impurity removal process, and the demulsifier has very high economic benefits and environmental benefits.

Description

Technical Field

[0001] The invention relates to the technical field of crude oil production liquid processing, and in particular to an environmentally friendly demulsifier and a preparation method thereof. Background Art

[0002] With the development of the world's oil industry, the amount of oil production has increased day by day, which has led to an increase in the amount of crude oil emulsion. Especially after the use of water injection to enhance oil recovery, the water content of crude oil has increased significantly, and most of the crude oil is produced in the form of oil-water emulsion. The crude oil produced contains a large amount of water and inorganic salts, which brings great difficulties to oil and gas gathering and transportation and crude oil refining, so dehydration and desalination are necessary.

[0003] In actual processes, when the oil temperature drops below 100°C, the mixture usually needs to be treated so that the organic phase and the aqueous phase in the mixture can be separated quickly and effectively. The current effective method is to add a demulsifier to the mixture to eliminate the emulsification and form an emulsified interface with a certain strength, thereby achieving the purpose of separating the oil and water phases.

[0004] Currently, demulsifiers have many ingredients, poor adaptability, strong selectivity, large dosage, high cost, and poor effect. They can easily cause the water content in the oil to be too high or the oil content in the water to be too high, and will also cause secondary pollution. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an environmentally friendly demulsifier, comprising the following components in parts by weight: 10 to 20 parts of modified polyamine polymer; 5 to 8 parts of corrosion inhibitor; 10 to 15 parts of additive; 5 to 15 parts of triethanolamine; 3 to 8 parts of ammonia water; 5 to 8 parts of polyethylene polyamine; 5 to 10 parts of potassium hydroxide; 15 to 25 parts of propylene oxide; 20 to 30 parts of ethylene oxide; 5 to 10 parts of glacial acetic acid; and 2 to 8 parts of distilled water.

[0006] Furthermore, the ethylene oxide, the propylene oxide and the modified polyamine polymer are used to prepare an initiator.

[0007] Furthermore, the modified polyamine polymer is synthesized by the cross-linking reaction of tetraethylenepentamine and epichlorohydrin. With this design, compared with the traditional phenolic resin structure demulsifier, the modified polyamine polymer has a long molecular chain and more branches, has better hydrophilicity, wetting performance and penetration effect, can quickly reach the oil-water interface and destroy the interfacial energy of the emulsion, and has the characteristics of fast oil-water separation speed and low oil content in water.

[0008] Furthermore, the triethanolamine, the ammonia water, the polyethylene polyamine, and the potassium hydroxide are used to prepare a complex solvent.

[0009] Furthermore, the corrosion inhibitor, the auxiliary agent and the glacial acetic acid are used to prepare auxiliary reagents.

[0010] Furthermore, the corrosion inhibitor is at least one of 2-mercaptobenzothiophene and hydroxyethylidene diphosphoric acid. Specifically, by adding the corrosion inhibitor, the corrosion resistance of the demulsifier can be enhanced.

[0011] Furthermore, the auxiliary agent is at least one of methanol, ethanol, toluene, xylene and ethylene glycol phenyl ether.

[0012] The beneficial technical effects of the environmentally friendly demulsifier of the present invention are as follows: this series of demulsifiers have the advantages of small dosage, high dehydration rate, fast dehydration speed, clean dewatering, etc., which solves the common defects of oil field demulsifiers in the past and reduces environmental pollution; it has the technical effects of low oil content in the water phase after treatment, good water phase cleanliness, low water phase turbidity and clear water-oil interface, and can also reduce the loss of crude oil in the impurity removal process, with very high economic and environmental benefits.

[0013] Another aspect of the present invention also provides a method for preparing an environmentally friendly demulsifier, comprising the following operations:

[0014] Step 1: prepare an initiator, firstly react propylene oxide and modified polyamine, and then add ethylene oxide to react to obtain a polymerization product after the reaction is completed;

[0015] Step 2: preparing a complexing solvent, mixing triethanolamine, ammonia water, polyethylene polyamine and potassium hydroxide in proportion to obtain a complexing solvent;

[0016] Step 3: preparing an auxiliary reagent, mixing the corrosion inhibitor, the auxiliary agent and glacial acetic acid to obtain an auxiliary reagent;

[0017] Step 4: Obtain the finished product by mixing the initiator, the complexing solvent and the auxiliary reagent, and blending them with distilled water to obtain the finished product.

[0018] Furthermore, the preparation processes of the initiator, the complexing reagent and the auxiliary reagent are all carried out in a reaction vessel, and nitrogen is introduced during the reaction process for protection. Specifically, through such a design, the mixing effect of the three reaction processes can be ensured.

[0019] Furthermore, in the three reaction processes, the reaction temperature is preset to 90-100°C, the stirring speed is preset to 180-200 r / min, the pressure is preset to -0.1-0.5 MPa, and the reaction time is preset to 0.5-1.5 h. Specifically, such reaction design conditions can ensure a uniform mixing reaction effect.

[0020] Furthermore, in step 4, during the preparation of the finished product, after adding the auxiliary reagent, the mixture is left to stand for 1 to 2 hours, and then the matching solvent and distilled water are added for blending. Specifically, through such a design operation, dilution is not likely to occur during the preparation process, and the reaction effect is good.

[0021] In summary, the beneficial technical effects of the preparation method of the environmentally friendly demulsifier of the present invention are: the preparation method is simple, and the demulsifier prepared by the method has the advantages of small dosage, high dehydration rate, fast dehydration speed, clean dehydration, etc., which solves the common defects of oil field demulsifiers in the past and reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment mode and are not to be considered as limiting the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0023] Figure 1 It is a step diagram of the method for preparing an environmentally friendly demulsifier disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0025] The invention discloses an environment-friendly demulsifier, which comprises the following components in parts by weight: 10 to 20 parts of modified polyamine polymer; 5 to 8 parts of corrosion inhibitor; 10 to 15 parts of auxiliary agent; 5 to 15 parts of triethanolamine; 3 to 8 parts of ammonia water; 5 to 8 parts of polyethylene polyamine; 5 to 10 parts of potassium hydroxide; 15 to 25 parts of propylene oxide; 20 to 30 parts of ethylene oxide; 5 to 10 parts of glacial acetic acid; and 2 to 8 parts of distilled water.

[0026] The ethylene oxide, the propylene oxide and the modified polyamine polymer are used to prepare an initiator. The triethanolamine, the ammonia water, the polyethylene polyamine and the potassium hydroxide are used to prepare a solvent. The corrosion inhibitor, the auxiliary agent and the glacial acetic acid are used to prepare an auxiliary agent.

[0027] In this embodiment, the corrosion inhibitor is at least one of 2-mercaptobenzothiophene and hydroxyethylene diphosphoric acid. The auxiliary agent is at least one of methanol, ethanol, toluene, xylene and ethylene glycol phenyl ether.

[0028] The beneficial technical effects of the environmentally friendly demulsifier of the present invention are as follows: this series of demulsifiers have the advantages of small dosage, high dehydration rate, fast dehydration speed, clean dewatering, etc., which solves the common defects of oil field demulsifiers in the past and reduces environmental pollution; it has the technical effects of low oil content in the water phase after treatment, good water phase cleanliness, low water phase turbidity and clear water-oil interface, and can also reduce the loss of crude oil in the impurity removal process, with high economic and environmental benefits.

[0029] Another aspect of the present invention also provides a method for preparing an environmentally friendly demulsifier, referring to Figure 1 As shown, the process comprises the following operations: step 1, preparing an initiator, firstly reacting propylene oxide and modified polyamine, and then adding ethylene oxide to react to obtain a polymerization product after the reaction is completed; step 2, preparing a matching solvent, uniformly mixing triethanolamine, ammonia water, polyethylene polyamine and potassium hydroxide in proportion to obtain a matching solvent; step 3, preparing an auxiliary reagent, mixing a corrosion inhibitor, an auxiliary agent and glacial acetic acid to obtain an auxiliary reagent; step 4, obtaining a finished product, mixing the initiator, the matching solvent and the auxiliary reagent, and blending them with distilled water to obtain a finished product.

[0030] Furthermore, the preparation processes of the initiator, the complexing reagent and the auxiliary reagent are all carried out in a reaction kettle, and nitrogen is introduced during the reaction for protection.

[0031] Furthermore, in the three reaction processes, the reaction temperature is preset to 90-100° C., the stirring speed is preset to 180-200 r / min, the pressure is preset to -0.1-0.5 MPa, and the reaction time is preset to 0.5-1.5 h.

[0032] Furthermore, in step 4, during the preparation of the finished product, after adding the auxiliary reagent, the mixture is allowed to stand for 1 to 2 hours, and then the matching solvent and distilled water are added for blending.

[0033] The application data of an environmentally friendly demulsifier prepared by the method disclosed in the above embodiment are as follows:

[0034] The results measured at 30°C are shown in Table 1.

[0035] Table 1 Experimental results of environmentally friendly demulsifier application

[0036]

[0037] At the same time, six demulsifiers sold on the market were selected, including Tangshan Dongyuan Chemical Co., Ltd., Sichuan Chuanqing Underground Technology Co., Ltd., Xi'an Sanwei Technology Development Co., Ltd., Langfang Development Zone Zhongyou Kexin Chemical Co., Ltd., Shaanxi Huatian Energy Technology Co., Ltd., and Sichuan Shenhe New Materials Technology Co., Ltd., and No. 1 is an environmentally friendly demulsifier. The application experiment results are shown in Table 2:

[0038] Table 2 Application test results of seven types of demulsifiers

[0039]

[0040] From the experimental results in Tables 1 and 2 above, it can be seen that the environmentally friendly demulsifier provided in this embodiment requires only 100 mg to 300 mg of demulsifier to treat 1 L of crude oil, and its oil-water interface is neat and the residual water content in the oil phase is low. Compared with the other six existing demulsifiers, the environmentally friendly demulsifier has the advantages of small dosage, high dehydration rate, fast dehydration speed, and clean dewatering.

[0041] In summary, the beneficial technical effects of the preparation method of the environmentally friendly demulsifier of the present invention are: the preparation method is simple, and the demulsifier prepared by the method has the advantages of small dosage, high dehydration rate, fast dehydration speed, clean dehydration, etc., which solves the common defects of oil field demulsifiers in the past and reduces environmental pollution.

[0042] The invention provides the following advantages: the device has a simple structure and is easy to manufacture.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0044] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. An environmentally friendly demulsifier, characterized in that: The invention comprises the following components in parts by weight: 10 to 20 parts of modified polyamine polymer; 5 to 8 parts of corrosion inhibitor; 10 to 15 parts of auxiliary agent; 5 to 15 parts of triethanolamine; 3 to 8 parts of ammonia water; 5 to 8 parts of polyethylene polyamine; 5 to 10 parts of potassium hydroxide; 15 to 25 parts of propylene oxide; 20 to 30 parts of ethylene oxide; 5 to 10 parts of glacial acetic acid; and 2 to 8 parts of distilled water.

2. The environmentally friendly demulsifier according to claim 1, characterized in that: The ethylene oxide, the propylene oxide and the modified polyamine polymer are used to prepare an initiator.

3. The environmentally friendly demulsifier according to claim 1, characterized in that: The triethanolamine, the ammonia water, the polyethylene polyamine, and the potassium hydroxide are used to prepare a complexing solvent.

4. The environmentally friendly demulsifier according to claim 1, characterized in that: The corrosion inhibitor, the auxiliary agent and the glacial acetic acid are used to prepare auxiliary agents.

5. The environmentally friendly demulsifier according to claim 1, characterized in that: The corrosion inhibitor is at least one of 2-mercaptobenzothiophene and hydroxyethylidene diphosphoric acid.

6. The environmentally friendly demulsifier according to claim 1, characterized in that: The auxiliary agent is at least one of methanol, ethanol, toluene, xylene and ethylene glycol phenyl ether.

7. A method for preparing an environmentally friendly demulsifier, characterized in that: The following operations are included: Step 1: prepare an initiator, firstly react propylene oxide and modified polyamine, and then add ethylene oxide to react to obtain a polymerization product after the reaction is completed; Step 2: preparing a complexing solvent, mixing triethanolamine, ammonia water, polyethylene polyamine and potassium hydroxide in proportion to obtain a complexing solvent; Step 3: preparing an auxiliary reagent, mixing the corrosion inhibitor, the auxiliary agent and glacial acetic acid to obtain an auxiliary reagent; Step 4: Obtain the finished product by mixing the initiator, the complexing solvent and the auxiliary reagent, and blending them with distilled water to obtain the finished product.

8. The method for preparing the environmentally friendly demulsifier according to claim 7, characterized in that: The preparation processes of the initiator, the complexing reagent and the auxiliary reagent are all carried out in a reaction kettle, and nitrogen is introduced during the reaction for protection.

9. The method for preparing the environmentally friendly demulsifier according to claim 8, characterized in that: In the three reaction processes, the reaction temperature was preset to 90-100°C, the stirring speed was preset to 180-200 r / min, the pressure was preset to -0.1-0.5 MPa, and the reaction time was preset to 0.5-1.5 h.

10. The method for preparing an environmentally friendly demulsifier according to any one of claims 7 to 9, characterized in that: In step 4, during the preparation of the finished product, after adding the auxiliary reagent, the mixture is allowed to stand for 1 to 2 hours, and then the matching solvent and distilled water are added for blending.

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