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Wetting agent and application thereof in binary compound flooding tertiary oil recovery

A wetting agent and ethylene glycol technology, applied in the field of oil production in oil fields, can solve the problems of not many and complex reservoir wettability, and achieve the effects of low production cost, improved oil recovery, and easy operation of process conditions.

Active Publication Date: 2010-11-24
大庆高新区华龙祥化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an important parameter of the reservoir interface phenomenon, it plays a decisive role in the degree of crude oil recovery, but because the wettability of the reservoir is very complicated, there are not many studies on improving oil recovery from the perspective of changing wettability

Method used

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  • Wetting agent and application thereof in binary compound flooding tertiary oil recovery
  • Wetting agent and application thereof in binary compound flooding tertiary oil recovery
  • Wetting agent and application thereof in binary compound flooding tertiary oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: 23% of sulfoamide betaine, 17% of alkylamide hydroxysulfonamide betaine, 15.5% of sulfonic acid imidazoline, 1% of fatty alcohol polyoxyethylene ether, polyoxyethylene sorbitan monooleic acid 0.5% of fat, 0.7% of polyoxyethylene alkylamine, 0.3% of fatty acid methyl ester ethoxylate, 1.5% of ethylene glycol fat, 1.5% of glyceride, 39% of distilled water, heated at 70°C and stirred for 20 minutes, and obtained D.

Embodiment 2

[0013] Embodiment 2: 13% of sulfoamide betaine, 7% of alkylamide sulfonamide betaine, 6% of sulfonic acid imidazoline, 7% of fatty alcohol polyoxyethylene ether, polyoxyethylene sorbitan monooleic acid Fatty acid 3%, polyoxyethylene alkyl amine 1.7%, fatty acid methyl ester ethoxylate 1.3%, ethylene glycol fat 5.5%, glyceride 1.5%, distilled water 54%, heating temperature 70 ℃ and stirring time 20min and obtain D.

Embodiment 3

[0014] Embodiment 3: sulfoamide betaine 33%, alkylamide hydroxysulfonamide betaine 17% sulfonic acid type imidazoline 19%, fatty alcohol polyoxyethylene ether 0.5%, polyoxyethylene sorbitan monooleic acid 0.4% of fat, 0.3% of polyoxyethylene alkylamine, 0.3% of fatty acid methyl ester ethoxylate, 0.6% of ethylene glycol fat, 0.4% of glyceride, 28.5% of distilled water, heated at 70°C and stirred for 20 minutes, and obtained D.

[0015] Quartz and limestone slices were cut into test pieces with a length of 3 cm, a width of 1.5 cm, and a thickness of 0.5 cm, and the test pieces were polished with metallographic sandpaper. Quartz is the main component of sandstone, which can represent sandstone, whose original wettability is moderately wet; limestone represents carbonate rock, whose original wettability is close to neutral.

[0016] Put the test piece into diluted crude oil and soak it at room temperature for two months. Take out the soaked test pieces and place them horizontal...

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Abstract

The invention relates to a wetting agent and application thereof in binary compound flooding tertiary oil recovery. The wetting agent comprises the following components in percentage by mass: 13 to 33 percent of sulfonamido-betaine, 7 to 17 percent of alkyl amido-hydroxy-sulfonamido-betaine, 6 to 19 percent of sulfonic acid type imidazoline, 0.5 to 7 percent of fatty alcohol-polyoxyethylene ether, 0.5 to 3 percent of polyoxyethylene sorbitan monooleate, 0.3 to 1.7 percent of polyoxyethylene alkyl amine, 0.3 to 1.3 percent of fatty acid methyl ester ethoxylate, 1 to 7 percent of auxiliary emulsifying agent and the balance of water. The wetting agent prepared by the method transforms a lipophilic oil layer into a strong water-wetting oil layer in the process of the binary compound flooding and can greatly improve the reservoir recovery. When binary compound flooding oil recovery is performed, a reservoir is transformed from lipophilicity into hydrophily, and the ultimate recovery can beimproved by 10.47 percent.

Description

Technical field: [0001] The invention relates to a wetting agent in the field of oil recovery and its application in binary compound flooding for tertiary oil recovery. Background technique: [0002] With the rapid development of the global economy, the demand for energy is increasing day by day, and the dependence on oil is becoming stronger and stronger. At present, most oilfields in China have entered into the late stage of high water cut. In the case that it is impossible to quickly discover new large-scale oilfields, improving the recovery of existing oilfield residues is an effective measure at present. The fundamental idea of ​​enhancing oil recovery comes from the formula: Pc=2σcosθ / γ. Under the condition of a certain capillary number γ, the interfacial tension σ and the wetting angle θ are reduced. These are two ways to achieve enhanced oil recovery. [0003] Since the 1980s, many methods of enhancing oil recovery have appeared successively, such as alkaline water...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 孙安顺
Owner 大庆高新区华龙祥化工有限公司
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