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Composite demulsifier and its composition and application

A compound demulsification and composition technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of unsatisfactory effect, unsatisfactory binary compound flooding heavy oil demulsification, polluted oil, etc., to avoid Viscous sediment problem, superior demulsification effect, effect of avoiding pollution

Active Publication Date: 2022-03-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But what follows is that due to the high concentration of surfactants and polymers in the produced fluid of binary compound flooding, it is very difficult to break the emulsion
[0003] People try traditional non-ionic demulsifiers for demulsification, but the effect is not ideal, and the amount of demulsifiers is tens to hundreds of times larger than that of conventional crude oil demulsifiers. Although the use of special non-ionic demulsifiers, such as CN101029253A and CN1570034A, can improve the demulsification effect , but it is still not ideal for the demulsification of binary compound flooding heavy oil produced fluid
There are also aluminum salts and traditional cationic polymer flocculants, but sticky precipitates will be produced at the bottom of the oil phase, contaminating the oil phase
[0004] CN1621123A has reported that block polyether is reacted with aluminum salt or ethyl silicate nucleating nanomaterials to prepare nuclear membrane structure demulsifier, which is used for chemical flooding production fluid demulsification, but silicon-containing demulsifier remains in the oil phase It may have an impact on subsequent processing; CN102233249A and CN104479731A use dendritic polyamide-amine cationic compounds, which can be used as reverse phase demulsifiers for oilfield sewage to demulsify binary flooding heavy oil production fluids with high surfactant content, adding volume is still large

Method used

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  • Composite demulsifier and its composition and application
  • Composite demulsifier and its composition and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] Wherein, the preparation method of described demulsification polymer comprises:

[0018] (1) In the presence of an etherification catalyst, a block polyether is obtained by reacting initiator, ethylene oxide and propylene oxide; wherein, the block polyether includes a polyether segment combined with an initiator, The polyether segment is a block copolymer formed by the reaction of ethylene oxide and propylene oxide; the initiator is an organic compound with one or more groups in hydroxyl, carboxyl and amine groups;

[0019] (2) In the presence of an esterification catalyst and a polymerization inhibitor, the block polyether is transesterified with an unsaturated carboxylic acid ester, so that the end of the block polyether has an unsaturated carboxylic acid ester, and then decompression Alcohol is removed by distillation to obtain an esterification product;

[0020] (3) In the presence of a free radical initiator and a polymerization aid, the esterification product is ...

preparation example 1

[0066] This preparation example is used to illustrate the preparation method of cationic hydroxyl silicone oil.

[0067] 2 g of N,N'-bis(hexadecyldimethyl)-3-oxa-1,5-pentammonium dibromide, 0.16 g of potassium hydroxide and 37.84 g of distilled water were stirred and mixed to completely dissolve . Then, 10 g of octamethylcyclotetrasiloxane was added dropwise under stirring (the addition was completed within about 10 minutes), while the temperature was raised to 75° C., and the reaction was kept for 6 hours. After the reaction stopped, it was cooled and neutralized by adding glacial acetic acid to obtain a cationic hydroxyl silicone oil emulsion E1, wherein the content of the cationic hydroxyl silicone oil was 24% by weight.

[0068] Silicone oil preparation example 2

[0069] This preparation example is used to illustrate the preparation method of cationic hydroxyl silicone oil.

[0070]3.5 g of N,N'-bis(dodecyldimethyl)-3-aza-1,5-pentammonium dichloride, 0.28 g of potassiu...

preparation example 2

[0077] Add 5g of tetraethylenepentamine, 2.4g of potassium hydroxide and 400g of propylene oxide into the autoclave, replace with nitrogen three times, raise the temperature to 115°C, keep the temperature until the pressure is 0, continue the reaction for 0.5h, then raise the temperature to 130°C, Add 200 g of ethylene oxide dropwise until the pressure no longer drops to obtain block polyether A2.

[0078] Polymer preparation example 1

[0079] This preparation example is used to illustrate the polymer for demulsification of the present invention and its preparation method.

[0080] (1) Add 50g of block polyether A1 and 50g of block polyether A2, as well as 0.9g of p-toluenesulfonic acid and 0.34g of hydroquinone into the reaction vessel, stir and heat up to 105°C, dropwise 1.18g of methyl methacrylate, after the dropwise addition, keep the reaction at 105°C for 4 hours, and distill off the methanol under reduced pressure to obtain the esterification product B1.

[0081] (2)...

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Abstract

The invention relates to the field of demulsification of binary compound flooding production fluid, in particular to a compound demulsifier and its composition and application. The composition contains cationic hydroxy silicone oil and demulsification polymer; wherein, cationic hydroxy silicone oil is obtained by emulsion polymerization of octamethylcyclotetrasiloxane and cationic surfactant, and the preparation method of demulsification polymer comprises : (1) in the presence of an etherification catalyst, the block polyether is obtained by reacting initiator, ethylene oxide and propylene oxide; (2) in the presence of an esterification catalyst and a polymerization inhibitor, the block polyether Ether and unsaturated carboxylic acid ester carry out transesterification reaction, so that the terminal of block polyether has unsaturated carboxylic acid ester, then decompression distillation removes alcohol, obtains esterification product; (3) in free radical initiator and polymerization In the presence of auxiliary agents, the esterification product is polymerized with cationic unsaturated monomers. The demulsifier provided by the invention can obtain superior demulsification effect on binary compound flooding production fluid at a relatively low dosage.

Description

technical field [0001] The invention relates to the field of demulsification of binary compound flooding production fluid, in particular to a compound demulsifier and its composition and application. Background technique [0002] Binary compound flooding refers to the technology of using polymers and surfactants to enhance oil recovery. Due to the use of more efficient surfactants, polymers and improved reservoir models, the role of binary compound flooding has been paid more and more attention . However, it follows that, due to the high concentration of surfactants and polymers in the binary compound flooding produced fluid, it is very difficult to break the emulsion. [0003] People try traditional non-ionic demulsifiers for demulsification, but the effect is not ideal, and the amount of demulsifiers is tens to hundreds of times larger than that of conventional crude oil demulsifiers. Although special non-ionic demulsifiers, such as CN101029253A and CN1570034A, can improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/34C08G65/26C08G65/332C08G77/06C08G77/16C09K8/58
CPCC08G77/16C08G77/06C08F290/062C08G65/2612C08G65/3322C09K8/58C08G2650/04C08F220/34
Inventor 王振宇孙玉海沈明欢于丽张峰苗杰冯雷雷杨景辉秦冰
Owner CHINA PETROLEUM & CHEM CORP