Method for reducing viscosity of heavy oil by emulsification

A technology for emulsifying viscosity-reducing and heavy oil, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc. It can solve problems such as inapplicability, and achieve strong mineral salt resistance, low viscosity, and moderate emulsification cost Effect

Inactive Publication Date: 2011-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has high salt resistance performance, the emulsification viscosity reduction method is still not suitable for super heavy oil with a viscosity greater than 500,000mPa.s at 50°C

Method used

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  • Method for reducing viscosity of heavy oil by emulsification

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034]Weigh 1g of naphtha as agent A, mix it with 10g of Xinjiang Tahe super thick crude oil with a viscosity of 1,080,000mPa.s at 50°C, and then weigh 0.08g of octylphenol polyoxyethylene polyoxypropylene ether sulfonate , 0.01g of sodium petroleum sulfonate formaldehyde condensate is dissolved in 4.24g of formation water with a total salinity of 45000mg / L, and is made into an aqueous solution of agent B. Add the aqueous solution of Agent B to the mixed oil of Agent A and heavy oil, and stir at 60°C for 2 minutes to form a stable oil-in-water emulsion. Measure the viscosity of the emulsion. The results are shown in Table 1.

example 2

[0036] Weigh 10g of kerosene as agent A, mix it with 10g of Xinjiang Tahe super thick crude oil with a viscosity of 1,800,000mPa. Dissolve 1 g of petroleum calcium sulfonate formaldehyde condensate in 8.57 g of formation water with a total salinity of 200,000 mg / L to prepare an aqueous solution of agent B. Add the aqueous solution of Agent B to the mixed oil of Agent A and heavy oil, and stir at 60°C for 2 minutes to form a stable oil-in-water emulsion. Measure the viscosity of the emulsion. The results are shown in Table 1.

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Abstract

The invention relates to a method for reducing the viscosity of heavy oil by emulsification. The method comprises the following steps: mixing an agent A selected from one or more of distillate oil, light oil or medium oil from a refinery plant, with the heavy oil; adding an agent B into the mixture of the heavy oil and the agent A; and blending to form an oil-in-water emulsion, wherein the agent B consists of an anionic surfactant, a nonionic-anionic surfactant and water. The method obviates the use of alkali and has high mineral salt tolerance. Particularly, the method can be used for emulsifying heavy oil with the ultra-high viscosity of 500,000mPa.s at 50 DEG C at moderate cost, and the emulsified heavy oil has low viscosity.

Description

technical field [0001] The invention relates to a method for emulsifying and reducing the viscosity of heavy oil. Background technique [0002] In recent years, international crude oil prices have continued to fluctuate at high levels, and oil demand has continued to rise. Marginal heavy oil and bitumen reservoirs, which were considered to be of no value in the past, have become effective resources with economic value. Heavy oil contains more colloids and asphaltenes, has high viscosity, poor fluidity, is difficult to mine, and has a low recovery factor. The emulsification viscosity reduction method is a common method for mining heavy oil at present, and has been successfully applied in heavy oil blocks in Shengli Oilfield and Liaohe Oilfield in my country. Mix the emulsifier and mineralized water, then add it from the oil well casing, and mix with the heavy oil that seeps from the formation to the wellbore. The emulsifier greatly reduces the interfacial tension of oil and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/584
Inventor 秦冰罗咏涛李本高
Owner CHINA PETROLEUM & CHEM CORP
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