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Emulsifying viscosity reducer for thick oil as well as preparation method and application of emulsifying viscosity reducer

A technology for emulsifying viscosity-reducing and heavy oil, which is applied in chemical instruments and methods, earthwork drilling, production fluids, etc. It can solve the problem of small oil-bearing area in the block, and achieve the effect of improving the viscosity-reducing effect and lowering the preparation cost

Active Publication Date: 2017-08-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many heavy oil reservoirs cannot be economically exploited by conventional methods due to scattered blocks, small oil-bearing area and remote location

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An emulsifying viscosity reducer for heavy oil, the emulsifying viscosity reducer contains 0.05% sodium hydroxide, 0.3% nonylphenol polyoxyethylene polyoxypropylene alcohol ether, 1.5% n-butyl Alcohol, 1% dibenzylidene sorbitol, balance water.

[0018] Take 20 grams of the above-mentioned heavy oil emulsification viscosity reducer and add it to 50 grams of heavy oil with a viscosity of 8716mPa.s at 50°C and a total salinity of 25,000mg / L. The viscosity of the emulsified heavy oil was tested by a rheometer, and the viscosity of the emulsified heavy oil was 122.5mPa.s, and the viscosity reduction rate was 98.59%.

Embodiment 2

[0020] An emulsifying viscosity reducer for heavy oil, according to mass percentage, the emulsifying viscosity reducer contains 0.2% sodium hydroxide, 0.5% nonylphenol polyoxyethylene polyoxypropylene alcohol ether, 2% n-butyl Alcohol, 2% dibenzylidene sorbitol, balance water.

[0021] Take 20 grams of the above-mentioned heavy oil emulsification viscosity reducer and add it to 50 grams of heavy oil with a viscosity of 8716mPa.s at 50°C and a total salinity of 25,000mg / L. The viscosity of the emulsified heavy oil was tested by a rheometer, and the viscosity of the emulsified heavy oil was 97.3mPa.s, and the viscosity reduction rate was 98.88%.

Embodiment 3

[0023] An emulsified viscosity reducer for heavy oil, according to mass percentage, the emulsified viscosity reducer contains 0.5% sodium hydroxide, 0.8% nonylphenol polyoxyethylene polyoxypropylene alcohol ether, 3% n-butyl Alcohol, 3% dibenzylidene sorbitol, balance water.

[0024] Take 20 grams of the above-mentioned heavy oil emulsification viscosity reducer and add it to 50 grams of heavy oil with a viscosity of 8716mPa.s at 50°C and a total salinity of 25,000mg / L. The viscosity of the emulsified heavy oil was tested by a rheometer, and the viscosity of the emulsified heavy oil was 81.7mPa.s, and the viscosity reduction rate was 99.06%.

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Abstract

The invention discloses an emulsifying viscosity reducer for thick oil as well as a preparation method and an application of the emulsifying viscosity reducer. The emulsifying viscosity reducer for the thick oil is prepared from, in percentage by mass, sodium hydroxide or sodium bicarbonate, alkylphenoxy polyoxyethylenepolyoxypropylene, n-butanol, dibenzylidene sorbitol and the balance of water. The emulsifying viscosity reducer for the thick oil is low in preparation cost and has the viscosity reducing rate reaching 98% or higher, can realize high-temperature automatic demulsification after exploration, also has good salt resistance and is particularly applicable to formation water with the degree of mineralization up to 25,000 mg / L.

Description

technical field [0001] The present invention relates to chemicals for oil field development, and more specifically, to an emulsified viscosity reducer for cold recovery of heavy oil and its preparation method and application. Background technique [0002] Heavy oil is a complex multi-component homogeneous organic mixture with high colloid and asphaltene content, low light component content, low straight-chain hydrocarbon content, high viscosity and poor fluidity. Many heavy oil reservoirs cannot be economically exploited by conventional methods due to scattered blocks, small oil-bearing area and remote location. [0003] Among PetroChina's proven reserves, ordinary heavy oil accounts for 74.7%, extra heavy oil accounts for 14.4%, and super heavy oil accounts for 10.9%. [0004] At present, heavy oil recovery technologies mainly include: steam injection method, burning oil layer, blending thin oil for viscosity reduction, solvent blending for viscosity reduction, heating for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584
Inventor 刘平许关利王友启周国华王锐
Owner CHINA PETROLEUM & CHEM CORP