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A kind of mixed fatty acid amidopropyl betaine compound and its application

A technology of fatty acid amidopropyl beet and fatty acid amidopropyl hydroxypropyl sulfobeet, applied in the application of chemical compound flooding composition in tertiary oil recovery, mixed fatty acid amidopropyl betaine compound, chemical compound flooding composition field , which can solve the problems of poor solubility and affect the application, and achieve the effects of diverse production raw materials, reduced production costs, and flexible and variable hydrophilic groups.

Active Publication Date: 2016-05-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the difficulties in alkali-free binary compound flooding technology is the development of high-efficiency surfactants: under alkali-free conditions, they can achieve ultra-low interfacial tension (10 -3 mN / m order of magnitude and below) puts forward very high requirements for active agents, and traditional heavy alkylbenzene sulfonate and petroleum sulfonate products basically cannot meet the needs
[0005] The amphoteric surfactant represented by sulfobetaine is a kind of surfactant agent with good performance for alkali-free binary composite flooding that has emerged in recent years. It has good interface performance, qualified adsorption, temperature resistance and salt resistance and High oil displacement efficiency; however, sulfobetaine has a high Krafft point (Krafft point), and its solubility in low salinity reservoirs is poor, which affects its application

Method used

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  • A kind of mixed fatty acid amidopropyl betaine compound and its application
  • A kind of mixed fatty acid amidopropyl betaine compound and its application
  • A kind of mixed fatty acid amidopropyl betaine compound and its application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] (1) Preparation of rapeseed oil fatty acid

[0044] 1. Add rapeseed oil into the autoclave, then add deionized water, hydrolyze for 8 hours at 260°C and 5.0MPa, take samples to analyze the acid value and saponification value of fatty acids, and stop the reaction when the hydrolysis rate reaches more than 98%. Discharge.

[0045] 2. Preparation of Rapeseed Oil Fatty Acid Amides

[0046] Add a certain amount of rapeseed oil fatty acid and N,N-dimethyl-1,3-propanediamine (the substance ratio is 1:1.2) into the autoclave, and react at 150-220°C for 6-10h, The rapeseed oil fatty acid amide can be prepared.

[0047] 3. Preparation of rapeseed oil fatty acid amidopropyl carboxyethyl betaine

[0048] Add rapeseed oil fatty acid amide and sodium chloroacetate (substance ratio is 1:1.05) into a four-neck round-bottomed flask, add isopropanol-water mixed solvent, and react at 70-80°C for more than 10 hours to obtain rapeseed oil Fatty acid amidopropyl carboxyethyl betaine.

...

Embodiment 1

[0058] Example 1 Oil-water interfacial tension test in block 1 of reservoir 1

[0059] Rapeseed oil fatty acid amidopropyl hydroxypropyl sulfobetaine alone. The produced water of block 1 of reservoir 1 was used to prepare rapeseed oil fatty acid amidopropyl hydroxypropyl sulfobetaine with mass concentrations of 0.05%, 0.10% and 0.20%, and polymer HPAM with a mass percentage concentration of 0.12%. Element chemical composite flooding composition, and the interfacial tension between it and the crude oil in block 1 of reservoir 1 was measured.

[0060] Oleic acid amidopropyl hydroxypropyl sulfobetaine was used as a control. The test results are shown in Table 1.

[0061] Table 1 Test results of oil-water interfacial tension under the condition of reservoir 1 block 1

[0062]

Embodiment 2

[0063] Example 2 Oil-water interfacial tension test of reservoir 1 block 2

[0064] Using rapeseed oil fatty acid amidopropyl carboxyethyl betaine and rapeseed oil fatty acid amidopropyl hydroxypropyl sulfobetaine to form a compound of rapeseed oil fatty acid amidopropyl betaine, in terms of weight ratio, rapeseed Oil fatty acid amidopropyl carboxyethyl betaine: rapeseed oil fatty acid amidopropyl hydroxypropyl sulfobetaine = 70:30. The alkali-free binary chemical compound with the mass concentration of rapeseed oil fatty acid amidopropyl betaine compound was 0.05%, 0.10% and 0.20%, and the mass percentage concentration of polymer HPAM was 0.15% with the produced water of reservoir 1 block 2. The flooding composition was used to measure the interfacial tension between it and the crude oil in block 2 of reservoir 1.

[0065] The oleic acid amidopropyl carboxyethyl betaine was used as a control. The test results are shown in Table 2.

[0066] Table 2 Test results of oil-water...

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Abstract

The invention relates to a fatty acid mixture amide propyl betaine compound and an application of fatty acid mixture amide propyl betaine chemical compound flooding composition in tertiary oil recovery. The fatty acid mixture amide propyl betaine chemical compound flooding composition comprises the components in percentage by weight as follows: 0.03-0.30% of the fatty acid mixture amide propyl betaine compound, 0.05-0.30% of a polymer and the balance of water. The fatty acid mixture amide propyl betaine compound is applied to the chemical compound flooding composition, and the interfacial activity of a system and the solubility of surfactants can be strengthened through synergy between carbon chains with different lengths and different hydrophilic group surfactants in the fatty acid mixture amide propyl betaine.

Description

technical field [0001] The invention relates to a mixed fatty acid amidopropyl betaine compound, a chemical compound flooding composition composed of the compound, and application thereof, in particular to the application of the chemical compound flooding composition in tertiary oil recovery, and belongs to the technical field of petroleum exploitation . Background technique [0002] With the continuous development of oilfields, China's major onshore oilfields have entered a stage of high recovery and high water cut. While crude oil production is decreasing, domestic economic development has increased the demand for crude oil. Stabilizing and increasing production in old oilfields has become an important issue for oilfield developers. [0003] The evaluation results of PetroChina's second and tertiary oil recovery potential show that chemical flooding is the main enhanced oil recovery technology suitable for my country's reservoir conditions. The development, promotion an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/16
Inventor 蔡红岩马德胜吴康云罗文利
Owner PETROCHINA CO LTD
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