Salt-resistant thick oil dispersion drag reducer and preparation method

Abstract

The present invention discloses a salt resistant heavy oil dispersing drag reducing agent and a preparation method therefor, and is characterized in that: the components in percentage by weight are: 5-10% of intermediate, 5-10% of fatty alcohol polyoxyethylene polyoxypropylene ether, 20-30% of EDY, and the remainder being water; and the components of the intermediate in percentage by weight are: 5-10% of modified acrylic acid, 80-90% of acrylamide, and 5-10% of fatty alcohol polyoxyethylene polyoxypropylene ether, wherein the modified acrylic acid is prepared at a ratio of 75-85% of dodecyl aniline and 15-25% of acrylic acid. The present invention is suitable for oilfield heavy oil mining, and the salt resistant heavy oil dispersing drag reducing agent can permeate into glial asphaltene molecules in the crude oil with no-stirring or slight stirring, and disperses stacked glial asphaltene molecule structures, and inverting components therein can change hydrophilic-lipophilic balance of the glial asphaltene molecules, and thereby reducing the production viscosity of the heavy oil, and increasing the production of the crude oil.

Description

technical field [0001] The invention relates to the preparation of the formulation of a heavy oil viscosity reducer for oilfield exploitation, in particular to a salt-resistant heavy oil dispersion drag reducer and a preparation method. Background technique [0002] At present, the development methods of heavy oil blocks are mainly steam huff and puff and steam flooding, and a small number of wells are developed by cold recovery. In heavy oil production, it is found that the viscosity of dewatered and degassed crude oil at 50°C in some heavy oil wells is not particularly high. After pumping, the polished rod descends slowly, and the oil well cannot produce normally. The measured viscosity of the produced fluid is more than 3 times higher than the measured viscosity. The main reason is that the produced fluid forms a W / O type emulsion, which increases the viscosity of crude oil, resulting in poor fluidity, which brings many difficulties to production. At present, heavy oil l...

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Problems solved by technology

In the production of heavy oil, it was found that the viscosity of dehydrated and degassed crude oil at 50°C in some heavy oil wells was not particularly high. The main reason is that the produced fluid forms a W / O emulsion, which increases the viscosity of crude oil, resulting in poor fluidity and bringing many difficulties to production

At present, the lifting of heavy oil is mainly based on water mixing to reduce viscosity, supplemented by electric heating and ground-driven screw pump lifting. Judging from the existing process production effect, it can basically meet the needs of heavy oil lifting, but there are still many problems. : The traditional electric heating process generally has the problems of high energy consumption and low pump efficiency; after mixing with water and heating, it is easy to scale and cause wellbore blockage, which is difficult to deal with and has a long treatment period; from the perspective of the application effect of conventional viscosity reducers, the experimental The indoor viscosity reduction effect is better, but the field application cannot achieve the viscosity reduction effect of the indoor experiment. The reason is that in the field application, it is difficult to achieve uniform mixing of the viscosity reducer and crude oil under the condition of slight stirring; and the traditional Viscosity has many technical problems such as small reduction in pipe resistance, poor salt resistance, and difficulty in dehydrating crude oil in the later stage, which are limited in promotion and application

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