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Thick oil emulsion viscosity-reducing agent and preparation method thereof

A technology of emulsification and viscosity reduction and emulsifier, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as poor salt resistance, and achieve the effects of low surface tension, enhanced recovery, and strong activity

Active Publication Date: 2009-08-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although anionic surfactants have high interfacial activity and high temperature resistance, they have poor salt resistance and cannot well solve the problem of viscosity reduction in heavy oil reservoirs with high salinity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: The formula and production process of thick oil emulsified viscosity reducer are: first, three kinds of raw materials of 81.15% water, 3.5% disodium monolauryl sulfosuccinate and 12.5% ​​emulsifier OP-15 are used in proportion Add the enamel reactor. Slowly raise the temperature to 57°C. Under constant stirring, add 0.85% sodium bicarbonate, 1.2% sodium carbonate, and 0.8% sodium hydroxide in proportion from the reaction kettle under the condition that the vacuum is -0.8 degree of vacuum. After continuing to stir for 30 minutes, stop heating. Stir while cooling, and cool to room temperature. Obtain viscous oil emulsified viscosity reducer.

[0036] Take the heavy oil from Zhaozhouqiao Oilfield in Huabei Oilfield, and use RV-2 rotational viscometer (made in Germany) to measure its viscosity at a temperature of 50°C to be 3764.2mPa.s. Measured with the same viscometer at the same temperature, the viscosity is 11.5mPa.s, and the viscosity reduction rate is...

Embodiment 2

[0037] Embodiment 2: The formula and production process of thick oil emulsified viscosity reducer are: first, three kinds of raw materials of emulsifier OP-15 of 80.6% water, 2.1% monolauryl sulfosuccinate, 14.2% are proportioned Add the enamel reactor. Slowly raise the temperature to 60°C. Under the condition that the vacuum is -0.7 degree of vacuum from the reaction kettle under constant stirring, inhale 0.6% sodium bicarbonate, 1.9% sodium carbonate, and 0.6% sodium hydroxide from the bottom of the kettle in proportion, after continuing to stir for 30 minutes, Turn off heat. Stir while cooling, and cool to room temperature. Obtain viscous oil emulsified viscosity reducer.

[0038] Take the heavy oil from Shennan Oilfield in Huabei Oilfield, and use RV-2 rotational viscometer (made in Germany) to measure its viscosity at a temperature of 50°C to be 8726.9mPa.s. Measured with the same viscometer under the temperature, the viscosity is 34.7mPa.s, and the viscosity reductio...

Embodiment 3

[0039] Embodiment 3: the formula and the production process of thick oil emulsified viscosity reducer are: first, the emulsifier OP-15 that the water of 83.9%, 4.9% disodium monolauryl sulfosuccinate, 8.5% Lvshun chemical factory are produced The three raw materials are added to the enamel reaction kettle in proportion. The temperature was raised slowly to 53°C. Under constant stirring, from the reaction kettle under the condition that the vacuum is -0.7 vacuum, add 1.3% sodium bicarbonate, 0.9% sodium carbonate, and 0.5% sodium hydroxide from the bottom of the kettle in proportion, and continue to stir for 30 minutes. , stop heating. Stir while cooling, and cool to room temperature. Obtain viscous oil emulsified viscosity reducer.

[0040] Take the heavy oil from Taijiazhuang Oilfield, Huabei Oilfield, and measure its viscosity at a temperature of 50°C with an RV-2 rotational viscometer (made in Germany) to be 7864.2mPa.s. Measured with the same viscometer at the same tem...

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Abstract

A condensed-oil emulsified viscosity reducer consists of sulfosuccinate disodium monolaurate 1.5-5 wt%, emulsifier OP-15 3-15 wt%, sodium hydrate 0.5-1 wt%, sodium carbonate 0.8-2.5 wt%, sodium hydrogen carbonate 0.5-1.5 wt% and water residues. Condensed-oil emulsified viscosity reducer 0.3-2 wt% is added into water when condensed-oil well is being put into production or pump is being checked, and it is injected into oil well. It has excellent activity and surface tension, better washing and viscosity-reducer functions for paraffin wax, gum and asphalt.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, and in particular relates to an emulsified viscosity reducer with high temperature resistance and good salt resistance used in formation treatment of heavy oil wells. In the formation treatment construction of heavy oil wells, when the dosage is 0.3% to 2%, it is a heavy oil emulsified viscosity reducer that solves the problem of viscosity reduction in heavy oil reservoirs with high salinity. Background technique [0002] Since the oil layer of the heavy oil reservoir contains a certain amount of clay, and the clay has a negative charge, an anionic surfactant is generally used as a viscosity reducer. Although anionic surfactants have high interfacial activity and high temperature resistance, they have poor salt resistance and cannot well solve the problem of viscosity reduction in heavy oil reservoirs with high salinity. Contents of the invention [0003] The p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52
Inventor 付亚荣蔡远红田炜吴泽美刘建华李冬青蒲祥金陈宝新翟建国孔繁勋陈鲲
Owner PETROCHINA CO LTD
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