Use of bi-alkyl carboxylate surface activator in triple oil recovery

A technology of alkyl carboxylate and surfactant, which is applied in the field of anionic surfactant gemini alkyl carboxylate, and achieves the effects of low production cost, simple preparation process and small adsorption loss

Inactive Publication Date: 2007-09-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no public report on the use of anionic gemini alkyl carboxylate surfactants in oil displacement systems

Method used

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  • Use of bi-alkyl carboxylate surface activator in triple oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1: the synthesis of double fourteen

[0065] ①Synthesis of myristyl chloride

[0066] Take 20-32g of myristic acid and 12.5-21.3g of thionyl chloride, stir and react for 2-4h, then reflux at 70-90°C until no gas is produced in the tail gas drying tube. Then the excess thionyl chloride was evaporated under reduced pressure, and then distilled under reduced pressure, the distillate was myristyl chloride.

[0067] ②Synthesis of intermediate ethylenediaminediacetic acid

[0068] Chloroacetic acid 10-19g, water 30-50ml, anhydrous sodium carbonate 7-9g to obtain sodium chloroacetate solution.

[0069] Anhydrous ethylenediamine 2.5-4.5g, water 20-45ml, sodium chloroacetate solution 12-25g. After constant temperature for 24h, reflux at 70-80°C for 2-4h to keep the solution pH = 8-9. After vacuum distillation at 60-70°C, add concentrated hydrochloric acid to the concentrated solution until pH = 1-2, white precipitate Generated, washed 3 times with distilled water ...

Embodiment 2

[0072] Example 2: Shuanglaurel composite oil displacement system, indoor simulated oil displacement

[0073] ①Formulation: 0.06wt% dilaurel, 0.24wt% complex alkali (Na 2 CO 3 : NaHCO 3 =1:1 mass ratio), 0.2wt% partially hydrolyzed polyacrylamide (HPAM), 99.5wt% mineralized water.

[0074] The partially hydrolyzed polyacrylamide has a molecular weight of 18 million and a degree of hydrolysis of 28 wt%, a product of Shengli Oilfield Polymer Co., Ltd., the same below.

[0075] ②Basic data of artificial core:

[0076] Experimental temperature: 60°C; air permeability: 1.34μm 2 ;Pore volume: 40cm 3 ; Saturated oil volume: 39cm 3 ;

[0077] The properties of Gudao River beach crude oil are as mentioned above;

[0078] ③Test process:

[0079] Slug design:

[0080] Formula system slug: 0.3PV;

[0081] Protection slug: 0.2wt% HPAM, 0.05PV; 0.05wt% HPAM, 0.05PV;

[0082] Generally, there are at least two slugs in the oil displacement process, the former is the oil displacemen...

Embodiment 3

[0085] Example 3: double fourteen compound oil displacement system, indoor simulated oil displacement

[0086] ①Recipe: 0.06wt% double fourteen, 0.24wt% compound alkali (Na 2 CO 3 : NaHCO 3 =1:1 mass ratio), 0.2wt% HPAM, 99.5wt% mineralized water.

[0087] 2. The basic data and test process of the artificial rock core are as described in Example 2;

[0088] ③Test results:

[0089] Water flooding recovery: 61.1wt% OOIP; chemical flooding recovery: 15.1wt% OOIP.

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Abstract

Use of dual alkyl carboxylate surface active agent as oil-displacing agent in the third oil extraction is carried out by mixing it composite base in proportion of Na2CO3: NaHCO3=1:1 and adding into hydrolytic polyacrylamide 0.2wt%. The oil-displacing agent consists of dual alkyl carboxylate surface active agent 0.01-1.0wt%, composite base 0.05-2.5wt%, hydrolytic polyacrylamide 0.2wt% and water residue. It's simple and cheap and can decrease interface tension between oil and water and have better oil-displacing effect.

Description

technical field [0001] The invention relates to the application of anionic surfactant gemini alkyl carboxylate in tertiary oil recovery. Background technique [0002] As an important strategic material, petroleum plays an important role in social development and plays an irreplaceable role in many fields, such as chemical industry, automobile manufacturing industry, shipping industry, and textile industry. The exploitation of crude oil can be divided into three stages: the first stage refers to the self-spraying of crude oil by the pressure of the formation, which is called primary oil recovery, and the recovery rate is about 15wt%; in the later stage of self-spraying, water can be injected from the well Maintaining the formation pressure is called secondary oil recovery, and the recovery rate is about 15-20wt%. After water flooding, the residual oil in the formation still accounts for 60-70wt%, which needs to be driven out by physical and chemical methods, which is called t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 郑利强董彬于丽李干佐赵明伟李洪宽袁渭彭翠娜
Owner SHANDONG UNIV
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