A temperature-resistant and salt-resistant thick oil emulsifying viscosity reducer and preparation method thereof

A technology for emulsifying viscosity-reducing and heavy oil, which is applied in the direction of chemical instruments and methods, drilling compositions, etc. It can solve the problems of emulsified viscosity-reducing agent's temperature resistance and salt resistance, low interfacial tension, etc., and achieve emulsification and viscosity reduction Good effect, improved high temperature resistance, excellent performance

Active Publication Date: 2020-08-04
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the problem that the temperature and salt resistance of the existing emulsified viscosity reducer is difficult to meet the needs of offshore heavy oil exploitation, the present invention proposes a temperature and salt resistant heavy oil emulsified viscosity reducer and its preparation method. The heavy oil emulsifying viscosity reducer is stable under harsh conditions, has excellent resistance to salt, calcium and magnesium, and temperature resistance. need

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  • A temperature-resistant and salt-resistant thick oil emulsifying viscosity reducer and preparation method thereof
  • A temperature-resistant and salt-resistant thick oil emulsifying viscosity reducer and preparation method thereof
  • A temperature-resistant and salt-resistant thick oil emulsifying viscosity reducer and preparation method thereof

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preparation example Construction

[0021] The embodiment of the present invention provides a method for preparing a temperature-resistant and salt-resistant thick oil emulsified viscosity reducer, comprising the following steps:

[0022] S1: Co-condensation of bisphenol AF, p-hydroxybenzenesulfonic acid and formaldehyde under alkaline conditions to obtain reaction solution I.

[0023] In this step, it should be noted that bisphenol AF is also called 2,2-bis(4-hydroxyphenyl)-hexafluoropropane. Under alkaline conditions, both bisphenol AF and p-hydroxybenzenesulfonic acid will generate phenoxide negative ions. Due to the electron delocalization of the phenoxide anion, the ortho-position carbon of the hydroxyl group on the benzene ring in bisphenol AF and p-hydroxybenzenesulfonic acid It has a negative charge on the surface, which is conducive to the nucleophilic addition reaction with the carbonyl of formaldehyde to generate different hydroxymethyl phenoxides; further, the phenoxide anion and the generated hydrox...

Embodiment 1

[0037] Add 0.015mol of bisphenol AF into the reaction kettle, add 50mL of water, add dropwise an aqueous solution of sodium hydroxide with a mass fraction of 40% to adjust the pH of the system to 12-13, add p-hydroxybenzenesulfonic acid and an aqueous formaldehyde solution, of which the aqueous solution of formaldehyde The mass fraction is 40%, the molar ratio of bisphenol AF and p-hydroxybenzenesulfonic acid is 1:2, and the addition of formaldehyde is 0.75 times of the total molar weight of bisphenol AF and p-hydroxybenzenesulfonic acid; the reaction kettle is placed at 65 Reaction at ℃ for 1.5h to obtain reaction solution Ⅰ;

[0038] Add OP-10 and formaldehyde aqueous solution to the above reaction solution I, wherein the amount of OP-10 added is 6 times the molar amount of bisphenol AF when preparing the reaction liquid I, and the added amount of formaldehyde is 2.75 times the molar amount of OP-10 ; Use 30% sulfuric acid solution to adjust the pH of the system to 3-4, put ...

Embodiment 2

[0040] Add 0.015mol of bisphenol AF to the reaction kettle, add 50mL of water, dropwise add 40% sodium hydroxide aqueous solution to adjust the pH of the system to 12-13, add p-hydroxybenzenesulfonic acid and formaldehyde aqueous solution, wherein the formaldehyde aqueous solution The mass fraction of bisphenol AF and p-hydroxybenzenesulfonic acid is 40%, the molar ratio of bisphenol AF and p-hydroxybenzenesulfonic acid is 1:1, and the addition of formaldehyde is 0.75 times of the total molar weight of bisphenol AF and p-hydroxybenzenesulfonic acid; React at 75°C for 2 hours to obtain reaction solution Ⅰ;

[0041] Add OP-10 and formaldehyde aqueous solution to the above reaction liquid I, wherein the amount of OP-10 added is 3 times the molar amount of bisphenol AF when preparing the reaction liquid I, and the amount of formaldehyde added is 3 times the molar amount of OP-10 ; Use 30% sulfuric acid solution to adjust the pH of the system to 3-4, put the reaction kettle at 85°C...

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Abstract

The invention provides a temperature-resistant and salt-resistant thick oil emulsifying viscosity reducer and a preparation method thereof and belongs to the technical field of thick oil recovery. Thetemperature-resistant and salt-resistant thick oil emulsifying viscosity reducer is stable under a harsh condition, can resist the temperature of 300 DEG C in simulation saline water with the mineralization degree being 8,246 g / L and can meet the requirement of emulsifying viscosity reduction during recovery of marine high-temperature and high-salt oil reservoir heavy oil. The preparation methodof the temperature-resistant and salt-resistant thick oil emulsifying viscosity reducer comprises the steps as follows: bisphenol AF, p-hydroxybenzenesulfonic acid and formaldehyde are subjected to copolycondensation under the alkaline condition to obtain a reaction solution I; an alkylphenol ethoxylate surfactant and formaldehyde are added to the reaction solution I, the pH of the system is adjusted to be acid, copolycondensation is further performed under the acid condition, standing for layering is performed, and an oil phase is taken to obtain the temperature-resistant and salt-resistant thick oil emulsifying viscosity reducer.

Description

technical field [0001] The invention belongs to the technical field of heavy oil exploitation, and in particular relates to oilfield chemical additives, in particular to a temperature-resistant and salt-resistant heavy oil emulsifying viscosity reducer and a preparation method thereof. Background technique [0002] At present, the potential reserves of heavy oil (including bitumen) in the world may be about 6 times that of the proven conventional crude oil reserves. my country has abundant heavy oil resources, with geological reserves reaching 20.6×10 8 t, the huge amount of resources determines that heavy oil may become the main energy source in the 21st century. However, most heavy oils are characterized by high viscosity and high density, so it is difficult to extract and transport them. At present, in the process of heavy oil production, the commonly used viscosity reduction methods at home and abroad include heating method, thin oil blending method, heavy oil modificati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/60C09K8/88C08G8/24
CPCC08G8/24C09K8/584C09K8/604C09K8/885
Inventor 邹剑姜翠玉白健华王艳萍王秋霞张龙力周法元李明轩张伟
Owner CHINA NAT OFFSHORE OIL CORP
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