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Viscosity reducer for heavy oil recovery and preparation method thereof

A technology of viscosity reducer and heavy oil, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as unsatisfactory viscosity reduction effect, and achieve the advantages of reducing flow resistance, reducing viscosity of heavy oil, and fast penetration speed Effect

Active Publication Date: 2020-01-21
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a viscosity reducer for heavy oil recovery, which solves the problem in the prior art that the viscosity reducer has an unsatisfactory effect on super heavy oil and heavy oil with high asphalt content

Method used

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  • Viscosity reducer for heavy oil recovery and preparation method thereof
  • Viscosity reducer for heavy oil recovery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A viscosity reducer for heavy oil recovery, consisting of the following components: 200 g of lauryl imidazoline betaine, 50 g of bis(2-ethylhexyl) phthalate, sodium chitosan maleic anhydride acylate 40g, 20g of polycaprolactone grafted starch nanocrystals with a particle size of 50nm, 2g of EDTA-2Na, and 688g of water.

[0032] The specific preparation method is as follows:

[0033] Step 1, take lauryl imidazoline betaine 200g, bis(2-ethylhexyl) phthalate 50g, maleic anhydride acylated chitosan sodium 40g, polycaprolactone grafted starch nano crystal 20g, EDTA-2Na 2g, water 688g;

[0034] Step 2, the maleic anhydride acylated chitosan sodium and EDTA-2Na taken in step 1 are dissolved in the water taken in step 1 to obtain a mixed aqueous solution;

[0035] Step 3, lauryl imidazoline betaine, bis(2-ethylhexyl) phthalate, polycaprolactone grafted starch nanocrystals weighed in step 1 are added in the mixed aqueous solution of step 2, Disperse at a high speed for 30 min...

Embodiment 2

[0037] A viscosity reducer for heavy oil recovery, consisting of the following components: 150 g of dodecyl dimethyl betaine, 80 g of bis(2-ethylhexyl) phthalate, maleic anhydride acylated shell 30 g of polysaccharide sodium, 10 g of polycaprolactone grafted starch nanocrystals with a particle size of 80 nm, 1 g of EDTA-2Na, and 729 g of water.

[0038] The specific preparation method is as follows:

[0039] Step 1, take by weighing lauryl dimethyl betaine 150g, bis(2-ethylhexyl) phthalate 80g, maleic anhydride acylated chitosan sodium 30g, polycaprolactone grafted Amylopectin nanocrystal 10g, EDTA-2Na 1g, water 729g;

[0040] Step 2, the maleic anhydride acylated chitosan sodium and EDTA-2Na taken in step 1 are dissolved in the water taken in step 1 to obtain a mixed aqueous solution;

[0041] Step 3, adding dodecyl dimethyl betaine, bis(2-ethylhexyl) phthalate, and polycaprolactone grafted starch nanocrystals to the mixed aqueous solution of step 2 in step 1 In the proces...

Embodiment 3

[0043] A viscosity reducer for heavy oil recovery, consisting of the following components: 180g of decanyl hydroxypropyl sulfobetaine, 100g of bis(2-ethylhexyl) phthalate, acylated maleic anhydride 50g of sodium chitosan, 30g of polycaprolactone grafted starch nanocrystals with a particle size of 100nm, 3g of EDTA-2Na, and 637g of water.

[0044] The specific preparation method is as follows:

[0045] Step 1, take by weight respectively decanyl hydroxypropyl sulfobetaine 180g, bis(2-ethylhexyl) phthalate 100g, maleic anhydride acylated chitosan sodium 50g, polycaprolactone Grafted starch nanocrystals 30g, EDTA-2Na 3g, water 637g;

[0046] Step 2, the maleic anhydride acylated chitosan sodium and EDTA-2Na taken in step 1 are dissolved in the water taken in step 1 to obtain a mixed aqueous solution;

[0047] Step 3, the decanyl hydroxypropyl sulfobetaine, bis(2-ethylhexyl) phthalate, polycaprolactone grafted starch nanocrystals weighed in step 1 are added to the mixing mixture...

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Abstract

The invention discloses a viscosity reducing agent for heavy oil recovery, composed of the following components in parts by mass: zwitterionic surfactant 15-20%, bis(2-ethylhexyl) phthalate 5-10 %, maleic anhydride acylated chitosan salt 3-5%, polycaprolactone grafted starch nanocrystal 1-3%, EDTA-2Na 0.1-0.3%, and the balance of water. The invention also provides a preparation method of the viscosity reducing agent for heavy oil recovery. The zwitterionic surfactant and bis(2-ethylhexyl) phthalate added in the formulation of the present invention have a major viscosity reducing effect, and other components such as maleic anhydride acylated chitosan salt and polycaprolactone grafted starch nanocrystal are combined for use to achieve synergistic effects. The viscosity reducing agent prepared by the method of the invention has good viscosity reducing effect on special heavy oil, super heavy oil and high asphaltene content, the viscosity reduction rate can reach 90% or more, and the viscosity reducing agent has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of petroleum recovery additives, and in particular relates to a viscosity reducer for heavy oil recovery and a preparation method thereof. Background technique [0002] The rapid development of the economy has driven a large demand for crude oil in the market, and the recoverable reserves of crude oil are becoming less and less. In the past 100 years, human beings have consumed more than 45% of the recoverable light crude oil. There are not many conventional crude oil reserves left, and its exploitation can no longer meet people's demand for resources. In this case, people turn their attention to the exploitation of heavy oil, which has become a hot research direction at present. [0003] my country is rich in heavy oil resources and has great potential for exploitation, but the characteristics of heavy oil determine that its exploitation has certain difficulties. Heavy oil is crude oil with high asphaltene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524C09K8/588C09K8/58
Inventor 李春霞郝琦薛迪
Owner SHAANXI YANCHANG PETROLEUM GRP
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