Water-soluble nonionic polymer viscosity reducer as well as preparation method and application thereof in viscosity reduction of extra-heavy oil

A non-ionic polymer and water-soluble technology, which is applied in drilling compositions, chemical instruments and methods, and bulk chemical production, can solve problems such as poor temperature resistance, poor viscosity reduction effect, and difficult demulsification, and achieve Provides viscosity-reducing performance, simple preparation method, and good adaptability to formation environment

Active Publication Date: 2022-08-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Aiming at the deficiencies of the prior art, especially the existing non-ionic polymers have poor temperature resistance and are not easy Viscosity effect is poor and other problems, the invention provides a water-soluble non-ionic polymer viscosity reducer and its preparation method and its application in the viscosity reduction of extra heavy oil

Method used

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  • Water-soluble nonionic polymer viscosity reducer as well as preparation method and application thereof in viscosity reduction of extra-heavy oil
  • Water-soluble nonionic polymer viscosity reducer as well as preparation method and application thereof in viscosity reduction of extra-heavy oil
  • Water-soluble nonionic polymer viscosity reducer as well as preparation method and application thereof in viscosity reduction of extra-heavy oil

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of a water-soluble nonionic polymer viscosity reducer, comprising the steps of:

[0036] (1) 2.464 g of N-vinylpyrrolidone and 0.04 g of phenyl methacrylate were dissolved in 14 mL of toluene, and the molar ratio of N-vinylpyrrolidone to phenyl methacrylate in the system was 98.9:1.1.

[0037] (2) Pass nitrogen and deoxygenate into the above obtained system for 30min, add 0.0251g of azobisisobutyronitrile, and conduct radical polymerization at 80°C for 10h to obtain a light yellow viscous liquid; after dissolving it in ethanol, use molecular weight cut-off The 1000D dialysis bag was dialyzed in ethanol for 72 hours, then rotary evaporated to remove the solvent, and then placed in a vacuum drying oven for drying at 60 °C for 18 hours to remove excess ethanol to obtain a light yellow transparent solid, which is a water-soluble non-ionic polymer. Adhesive, its weight average molecular weight is 1.094×10 4 .

Embodiment 2

[0039] The preparation method of a water-soluble nonionic polymer viscosity reducer is as described in Example 1, the difference is: the amount of N-vinylpyrrolidone used in step (1) is 2.081g, toluene is 12mL, and N-ethylene The molar ratio of pyrrolidone to phenyl methacrylate is 98.7:1.3; 0.0212g of azobisisobutyronitrile is added in step (2); the weight-average molecular weight of the obtained water-soluble nonionic polymer viscosity reducer is 1.133×10 4 .

Embodiment 3

[0041] The preparation method of a water-soluble nonionic polymer viscosity reducer is as described in Example 1, except that the amount of N-vinylpyrrolidone used in step (1) is 1.800 g, toluene is 10.16 mL, and N- The molar ratio of vinylpyrrolidone to phenyl methacrylate is 98.5:1.5; 0.0184g of azobisisobutyronitrile is added in step (2); the weight-average molecular weight of the obtained water-soluble nonionic polymer viscosity reducer is 1.307× 10 4 .

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Abstract

The invention provides a water-soluble nonionic polymer viscosity reducer, a preparation method thereof and application of the water-soluble nonionic polymer viscosity reducer in viscosity reduction of extra-heavy oil. The water-soluble nonionic polymer viscosity reducer has a structure as shown in a formula (I), and the preparation method comprises the following steps: in a solvent, carrying out free radical polymerization reaction on N-vinyl pyrrolidone and phenyl methacrylate under the initiation of an initiator to obtain the water-soluble nonionic polymer viscosity reducer. The polymer has N-vinyl pyrrolidone, so that the viscosity reducer has excellent temperature resistance and salt resistance, and in addition, due to the existence of a benzene ring in the polymer, the viscosity reducer can be better dissolved in extra-heavy oil. Viscosity reduction experiments of extra-heavy oil find that when the dosage is 600mg/L, the viscosity reduction rates of the polymer in pure water and mineralized water can reach 98% or above, and the polymer can well adapt to the stratum environment and is convenient for oil field application.

Description

technical field [0001] The invention relates to a water-soluble nonionic polymer viscosity reducer, a preparation method and an application in the viscosity reduction of extra-heavy oil, and belongs to the technical field of emulsified viscosity reducers. Background technique [0002] Due to the vigorous development of conventional oil fields, their reserves are increasingly exhausted, and the exploitation of some extra-heavy oil and super-heavy oil reservoirs that are difficult to develop and utilize is gradually put on the agenda, which is particularly prominent in my country. Emulsifying viscosity reduction is one of the most effective ways to reduce viscosity of heavy oil at present. How to choose an emulsifying viscosity reducer with excellent performance is the key to improving the recovery rate of extra-heavy oil and super-heavy oil. Emulsifying viscosity reducers can be divided into non-ionic surfactants, anionic surfactants, cationic surfactants, anionic non-surfact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/10C08F220/18C09K8/588
CPCC08F226/10C09K8/588C08F220/1806Y02P20/54
Inventor 谭业邦李星星吴若楠颜玉涵
Owner SHANDONG UNIV
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