A kind of sulfonate surfactant suitable for weak alkali three-component compound flooding and its application

A surfactant and ternary composite technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of formation damage caused by strong alkali, and achieve controllable product composition, enhanced oil recovery, and preparation technology. simple effect

Active Publication Date: 2016-02-17
HEILONGJIANG SHINEWELL CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of sulfonate surfactant suitable for weak base three-way compound flooding, this kind of sulfonate surfactant suitable for weak base three-way compound flooding is used to solve the existing three-way compound Another object of the present invention is to provide the application of this kind of sulfonate surfactant suitable for weak alkali three-way compound flooding

Method used

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  • A kind of sulfonate surfactant suitable for weak alkali three-component compound flooding and its application
  • A kind of sulfonate surfactant suitable for weak alkali three-component compound flooding and its application
  • A kind of sulfonate surfactant suitable for weak alkali three-component compound flooding and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0018] This kind of sulfonate surfactant suitable for weak base ASP flooding is made of C 12 ~C 24 Alkylaryl compounds, C 20 ~C 28 After mixing the mixed α-olefins, carry out sulfonation reaction, aging hydrolysis, then add alcohol, and then neutralize. Alkylaryl sulfonate and α-alkenyl sulfonate, wherein the average equivalent weight of alkylaryl sulfonate is 400~500, the specific preparation method is as follows:

[0019] ⑴Choose alkylbenzene, C with an average molecular weight of 310 20 ~C 28 Mixed α-olefins, mixed as raw materials for sulfonation, wherein the weight percentage of alkylbenzene is 50%~90%, C 20 ~C 28 The weight percentage of mixed α-olefins is 10%~50%; (2) Sulfonation reaction: use falling film sulfonator to carry out sulfonation reaction on the above mixed sulfonation raw materials, the reaction process conditions are: the molar ratio of reaction raw materials is 1.0~2.0:1, sulfonation reaction temperature is 30℃~80℃, SO 3 The gas concentration is 2...

Embodiment 2

[0022] The specific preparation method of this sulfonate surfactant suitable for weak alkali three-component compound flooding is as follows:

[0023] ⑴Choose alkylxylene and C with an average molecular weight of 310 20 ~C 28 Mixed α-olefins, mixed as raw materials for sulfonation, wherein the weight percentage of alkylxylene is 65%~85%, C 20 ~C 28 The weight percentage of mixed α-olefins is 15%~35%; (2) Sulfonation reaction: use falling film sulfonator to carry out sulfonation reaction on the above mixed sulfonation raw materials, the reaction process conditions are: the molar ratio of reaction raw materials is 1.3~1.45:1, sulfonation reaction temperature is 45℃~55℃, SO 3 The gas concentration is 4.0g / L~4.5%g / L, the total amount of protective air volume is controlled at 2000L / h, the ratio of primary air to secondary air is 500 / 1500L / h~600 / 1400L / h; the molar ratio of reaction raw materials is SO 3 The molar ratio with the mixed sulfonated raw material;

[0024] (3) Aging...

Embodiment 3

[0026] It is suitable for performance experiment of sulfonate surfactant used in weak base ASP flooding.

[0027]Utilize the sulfonate surfactant suitable for weak base three-way compound oil flooding prepared in Example 1, prepare the weak base three-way compound system as shown in Table 1, the method is: surfactant (effective concentration) and alkali All are first prepared into 5wt% mother liquor. The polymer is prepared into a 5000mg / L solution by advanced treatment sewage, and the polymer solution is stirred for 2-3 hours at a speed of 1000RPM, and matured for 12 hours. When preparing the ternary system, dilute the 5000mg / L solution with sewage to the corresponding concentration. When preparing the ternary system, according to the principle that the lesser amount is added first and the surfactant and alkali should be added separately, the order of adding various chemical agents should be: surfactant-polymer-sewage-alkali. Weighing should be accurate to 0.001g, and the p...

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Abstract

What the present invention relates to is a kind of sulfonate surfactant suitable for weak alkali three-element compound oil flooding and its application. This sulfonate surfactant suitable for weak alkali three-element compound oil flooding is prepared by the following method: select C12~C24 alkylaryl compounds, C20~C28 mixed α-olefins with an average molecular weight of 310, mixed; sulfonation reaction: using falling film sulfonator for sulfonation reaction, the molar ratio of raw materials is 1.0~2.0:1, The sulfonation reaction temperature is 30°C~80°C, and the SO3 gas concentration is 2.0g / L~6.0%? g / L, the total amount of protected air volume is controlled to 2000L / h, and the ratio of primary air to secondary air is 500 / 1500L? / h~600 / 1400L / h; aging and neutralization: Add 2.0%~4.0% water to the above sulfonated product at the sulfonation temperature for hydrolysis and aging for 0.5h~1.5h, add alcohol, and then use 20% The alkaline solution is neutralized at 30°C to 60°C to pH=8 to 9 to obtain a sulfonate surfactant suitable for weak alkali three-component compound flooding. The invention has little damage to the oil layer, low corrosion and scaling on oil well pipes and oil well pumps, and can improve the recovery rate of crude oil by more than 20% compared with water flooding.

Description

technical field [0001] The invention relates to a surfactant used in oil field tertiary oil recovery, in particular to a sulfonate surfactant suitable for weak alkali three-component compound oil flooding and its application. Background technique [0002] Alkyl aryl sulfonate is a well-recognized surfactant for oil displacement at home and abroad, and it is mainly used in the composite flooding technology of oil field tertiary oil recovery. ASP flooding (that is, alkali-surfactant-polymer three chemical agent systems) can better enhance oil recovery through the combination of chemical agents and their synergistic effects, and has been carried out in Daqing, Shengli and Xinjiang oilfields On-site pilot test, the recovery rate increased by more than 20%. Combination flooding technology has become a cost-effective tertiary oil recovery technology method. Surfactants play an important role in tertiary oil recovery. It mainly achieves the purpose of enhancing oil recovery by r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 徐立波闫喜林
Owner HEILONGJIANG SHINEWELL CHEM CO LTD
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