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Polymer viscosity reducer for thickened oil and preparation method thereof

A polymer and viscosity reducer technology, which is applied in the field of polymer viscosity reducer for heavy oil and its preparation, can solve the problem of limited viscosity reduction effect of surfactant-based viscosity reduction systems, low heavy oil recovery, and poor surface activity and other problems, to achieve the effects of strong affinity and permeability of heavy oil, enhanced viscosity and mechanical properties, and enhanced flooding performance

Active Publication Date: 2019-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experimental phenomena in the above documents show that surfactants and their complexes have strong emulsifying ability, but due to their low molecular weight and poor permeability, they are not compatible with polar viscosifying components (asphaltenes, gums) in heavy oil. Substances) have poor affinity, so it is difficult to disperse and emulsify heavy oil in the form of large water-in-oil emulsion droplets into smaller-sized oil-in-water emulsion droplets, resulting in the viscosity reduction of surfactant-based viscosity-reducing systems. The effect is limited, and it is mostly used for low-viscosity oil (viscosity less than 1000mPa·s) in ordinary heavy oil
Hydrophilic polymers have a strong viscosifying effect, have a high affinity with the polar components of heavy oil, and can penetrate into the deep layer of heavy oil to contact with colloids, but their surface activity is poor, and their emulsifying performance is insufficient, so it is difficult to mix with thick oil. The oil forms an emulsion, and heavy oil can only be exploited by means of control and flooding, which has poor viscosity reduction effect and low recovery rate of heavy oil

Method used

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  • Polymer viscosity reducer for thickened oil and preparation method thereof
  • Polymer viscosity reducer for thickened oil and preparation method thereof
  • Polymer viscosity reducer for thickened oil and preparation method thereof

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preparation example Construction

[0041] Another aspect of the present invention provides a preparation method of the polymer viscosity reducer, wherein the method comprises the following steps:

[0042](1) acrylamide and sodium α-olefin sulfonate are dissolved in deionized water to form an aqueous solution,

[0043] (2) At an elevated temperature, for example, 50-70° C., add a redox initiator system to the aqueous solution and keep stirring at a low speed to obtain the polymer viscosity reducer of the formula (I).

[0044] In a preferred embodiment of the method of the present invention, a certain amount of acrylamide and sodium α-olefin sulfonate are mixed in deionized water to form an aqueous solution, and the solution is heated to 50-70°C in a water bath, and then a certain amount of Na 2 S 2 o 8 and Na 2 SO 3 Add it into the solution and keep stirring at a low speed for 8-16h to obtain the amphiphilic polymer HPAM / AOS.

[0045] In a preferred embodiment of the method of the present invention, the con...

Embodiment 1

[0067] See Tables 1 and 2 for the elemental analysis of the polymer viscosity reducer (which is the preferred hydrolyzed polymer viscosity reducer) for heavy oil.

[0068] Table 1 Mass ratio of elements in HPAM / AOS and HPAM solid samples

[0069]

[0070] Table 2 The molar ratio of each element in HPAM / AOS and HPAM solid samples

[0071]

[0072] The elemental analysis results are shown in Tables 1 and 2. According to Tables 1 and 2, it is found that the mass fractions and mole fractions of the elements in HPAM and HPAM / AOS are very close, and the absolute values ​​of the relative deviations of the C, H, and O elements are all 3 %, indicating that the main structures of the two are very similar. Due to the extremely low content of S element, it is approximately considered that HPAM and HPAM / AOS do not contain S element. Comparing the elemental analysis results of HPAM and HPAM / AOS, according to the mole fraction of each element of the two, it is found that the two main...

Embodiment 2

[0074] UV spectroscopic analysis of polymer viscosity reducer for heavy oil, see figure 1 .

[0075] The results of UV spectroscopy were figure 1 shown, according to figure 1 Comparing the UV spectra of HPAM / AOS and HPAM, it can be found that both HPAM / AOS and HPAM have maximum absorption peaks at around 200nm, where λmax of HPAM / AOS=202nm, and λmax of HPAM=201nm. This characteristic absorption band is caused by the n→π* transition of the amide, since the H in the aldehyde group is replaced by -NH 2 Substitution, resulting in a blue shift of the n→π* absorption band. According to this, it can be proved that both HPAM / AOS and HPAM molecules contain "-CONH 2 "Structural unit, HPAM / AOS is similar to HPAM molecular structure, which proves that HPAM / AOS is a polymer modified with HPAM as the matrix.

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Abstract

The invention relates to a polymer viscosity reducer for thickened oil. The polymer viscosity reducer is a hydrophobically modified polyacrylamide and has a structural formula shown as formula (I), wherein n represents the total number of polyacrylamide monomers, ranges from 60,000 to 100,000, preferably from 7,000 to 85,000; x represents the number of acrylic monomers, ranges from 10,000 to 40,000, preferably 20,000 to 350,000; m represents the number of hydrophobic monomers, and ranges from 4000 to 10000, preferably from 6000 to 8000. The invention also relates to a preparation method and application of the polymer viscosity reducer for thickened oil.

Description

technical field [0001] The invention relates to a polymer viscosity reducer for heavy oil and a preparation method thereof. Background technique [0002] With the development of conventional crude oil production, the proportion of heavy oil in the proven oil resources is increasing, and the production of heavy oil is becoming more and more important. High density, high freezing point, high viscosity and difficult flow are the outstanding characteristics of heavy oil resources, which seriously restrict the exploitation and transportation of heavy oil. For a long time, for the transportation of high-viscosity and high-condensation heavy oil, traditional heating and viscosity-reducing transportation methods have been mainly used at home and abroad; the former is intermittently heated along the oil pipeline, which consumes a lot of fuel and power; The source and output of thin oil are significant and the cost is relatively high. Therefore, finding a viscosity reduction method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/12C08F220/56C08F228/02C09K8/588C09K8/508C09K8/88
CPCC08F8/12C09K8/5083C09K8/588C09K8/882C08F220/56C08F228/02
Inventor 徐鹏林吉生于田田盖平原邹斌刘岩贺文媛何绍群翟勇谢志勤
Owner CHINA PETROLEUM & CHEM CORP
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