Petroleum sodium sulfonate composition as well as preparation method and application thereof

Abstract

The invention provides a petroleum sodium sulfonate composition as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing 5 to 95weight percent of a fraction 1 of which the average molecular weight is 252 to 312, 5 to 95 weight percent of a fraction 2 of which the average molecular weight is 313 to 395 and 0 to 50 weight percent of a fraction 3 of which the average molecular weight is 396 to 490 according to 100 percent of the total weight of a mixed material, thus obtaining the mixed material; adding a diluent into the mixed material, thus obtaining a diluted product; carrying out sulfonation treatment on the diluted product by adopting an SO3 gas, thus obtaining a sulfonated product, wherein the diluent is prepared from one or a combination of several alcohols of which the carbon chain lengths are C3 to C10, and the dosage of the diluent is 0.1 to 10 percent of the weight of the mixed material; then neutralizing petroleum sulfonic acid in the sulfonated product by adopting a sodium hydroxide aqueous solution until the pH (Potential of Hydrogen) value of a system is 7 to 11, thus obtaining the petroleum sodiumsulfonate composition.

Description

technical field [0001] The invention relates to a petroleum sulfonic acid sodium salt composition, a preparation method and application thereof, and belongs to the technical field of petroleum exploitation. Background technique [0002] Tertiary oil recovery (EOR) technology is an important oilfield development technology that can use new technologies such as physics, chemistry and biology to enhance oil recovery. Among them, chemical composite flooding is an effective method in tertiary oil recovery technology that can greatly increase oil recovery in oilfields, and generally can increase oil recovery by more than 15%. Strong alkali (NaOH) ASP flooding using alkylbenzene sulfonate as surfactant has been applied in field test in Daqing Oilfield. The test results show that ASP flooding can increase recovery by more than 20%. However, some problems have been exposed in the field test of strong alkali ASP flooding: firstly, due to the high concentration of strong alkali used i...

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Problems solved by technology

However, some problems have been exposed in the field test of strong alkali ASP flooding: firstly, due to the high concentration of strong alkali used in the compound system, the scale of the oil well is serious, the inspection period of the pump is shortened, the equipment is seriously corroded, and the productivity of the oil well is reduced; The output fluid emulsification is serious in the alkali complex system, which makes it difficult to demulsify and dehydrate the output fluid, which increases the technical difficulty and additional cost of oil recovery; in addition, because the alkali concentration has a great influence on the viscosity of the ternary system, In order to achieve the designed flow control capability, the concentration of the polymer in the formulation system has to be increased, thus increasing the cost of the oil displacement agent

Chinese patent CN 1782019 A uses different carbon chain alkylbenzene sulfonate combinations to obtain heavy alkylbenzene sulfonate products suitable for weak alkali composite flooding. However, due to the limited raw materials of heavy alkylbenzene in my country, the number of synthetic products cannot meet the needs of composite flooding sites. In addition, heavy alkylbenzene sulfonate products cannot achieve ultra-low interfacial tension under alkali-free conditions

Chinese patent CN 1458220A uses the second-line decompression distillate as the raw material, but due to the low molecular weight of the raw material, it often needs to be compounded with other types of surfactants to have good adaptability, and the alkali-free system described in the patent needs to add salt Alternative base

At the same time, the technical solution disclosed in Chinese patent CN1275431A also has problems such as narrow molecular weight range of raw materials and poor product adaptability, and because the selected raw material aromatics content is low, it is necessary to extract and separate unreacted oil in the synthesis process.

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