Method for reducing viscosity of crude oil

A crude oil and viscosity technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of difficult popularization and application, increase investment and operation and maintenance costs, etc., and achieve convenient operation, investment and operation costs. Low, EOR effect

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to add an ultrasonic generator, which increases investment and operation and maintenance costs, and is not easy to achieve popularization and application.

Method used

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  • Method for reducing viscosity of crude oil
  • Method for reducing viscosity of crude oil
  • Method for reducing viscosity of crude oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take a certain kinematic viscosity (50°C) as 722.6mm 2 20g of crude oil per s and 180g of water with a pH of 5.5 were placed in a three-necked flask, and the magnetic stirrer was started, and 4.0mL of FeSO with a concentration of 50g / L 4 Add the aqueous solution to the three-necked flask, add 1.0ml of hydrogen peroxide solution with a concentration of 90g / L after 5min, stop stirring after reacting at 50°C for 4h, let it stand for oil-water separation, take the upper crude oil to measure the viscosity, the viscosity is 584.4mm 2 / s, the viscosity reduction rate is 19.1%.

Embodiment 2

[0027] Take a certain kinematic viscosity (50°C) as 1164.0mm 2 20g of crude oil per s and 180g of water with a pH of 4.0 are placed in a three-necked flask, and the magnetic stirrer is started, and 4.0mL of Fe(NO with a concentration of 40g / L 3 ) 2 Add the aqueous solution to the three-necked flask, add 1.0mL of potassium hypochlorite solution with a concentration of 54g / L after 5min, stop stirring after reacting at 80°C for 6h, let it stand for oil-water separation, take the upper crude oil to measure the viscosity, the viscosity is 907.9mm 2 / s, the viscosity reduction rate is 22.0%.

Embodiment 3

[0029] Take a certain kinematic viscosity (50°C) as 186.6mm 2 20g of crude oil per s and 180g of water with a pH of 6.0 were placed in a three-necked flask, and the magnetic stirrer was started, and 1.0mL of FeSO with a concentration of 36g / L 4 Add the aqueous solution to the three-necked flask, add 1.0mL of sodium hypochlorite solution with a concentration of 18g / L after 5min, stop stirring after reacting at room temperature for 2h, let it stand for oil-water separation, take the upper crude oil to measure the viscosity, the viscosity is 152.4mm 2 / s, the viscosity reduction rate is 17.8%.

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Abstract

The invention provides a method for reducing the viscosity of crude oil, which comprises the following steps: injecting water into the crude oil and adding a catalyst and an oxidant, then mixing the mixture evenly. By oxidating a part of the crude oil by a catalytic oxidation method, the method reduces the relative molecular mass of the crude oil, thereby reducing the viscosity of the crude oil, ensuring that the crude oil is easy to be displaced, and further increasing the recovery ratio.

Description

technical field [0001] The invention relates to a method for reducing the viscosity of crude oil, in particular to a method for reducing the viscosity of crude oil through a catalytic oxidation method so as to increase the recovery rate of crude oil. Background technique [0002] The discovery of oil led to the development of oil recovery technology, and the contradiction between supply and demand of oil promoted the development of oil recovery technology. Based on the primary oil recovery technology relying on natural energy, the secondary oil recovery technology of water injection and gas injection has been developed, which has improved the oil recovery rate to a certain extent. However, after secondary oil recovery, the remaining crude oil in the oil layer has a high viscosity and is adsorbed in the pores of sandstone particles or in the cracks and cavities of the formation. It is difficult to be displaced only by water injection and gas injection, and this part of crude ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22C09K8/58
Inventor 李本高侯钰秦冰桑军强
Owner CHINA PETROLEUM & CHEM CORP
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