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A kind of emulsion for water blocking and preparation method thereof

A technology for water use and emulsion, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing the cost of water treatment, high water content of the output liquid, and reducing crude oil production, so as to reduce water content and increase crude oil production. The effect of improving yield and stability

Active Publication Date: 2019-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most oilfields at home and abroad are developed by water injection. In the middle and later stages of development, the injected water will enter the production well along the fractures and high-permeability strips, which will cause the water content of the produced fluid to be too high and even the production well to be flooded. water costs and reduces crude oil production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This example is used to prepare emulsion for oil well water plugging.

[0020] The oil phase is refinery residual oil, the emulsifier is a mixture of oleic acid and sodium alkylbenzenesulfonate in a mass ratio of 3:1, the dispersant is a mixture of sodium humate and sodium lignosulfonate in a mass ratio of 2:1, The stabilizer is a mixture of sodium hydroxide and sodium bicarbonate at a mass ratio of 10:1, and the stabilizer is sodium metaphosphate.

[0021] Add 53g of water, 0.125g of sodium alkylbenzene sulfonate, 1g of dispersant, and 0.5g of stabilizer to a 250mL reaction vessel under stirring, stir to dissolve and disperse evenly, heat the water phase to 80°C; Dissolve oleic acid in 45g of the oil phase, then slowly pour the oil phase at a temperature of 90°C into the water phase under high-speed stirring, and stir until it is completely emulsified to obtain an emulsion for water blocking.

[0022] After standing for 1 month, the emulsion was stirred to restore a u...

Embodiment 2

[0024] This example is used to prepare emulsion for oil well water plugging.

[0025] The oil phase is refinery residual oil, the emulsifier is a mixture of oleic acid and sodium alkylbenzenesulfonate in a mass ratio of 3:1, the dispersant is a mixture of sodium humate and sodium lignosulfonate in a mass ratio of 2:1, The stabilizer is a mixture of sodium hydroxide and sodium bicarbonate at a mass ratio of 10:1, and the stabilizer is sodium metaphosphate.

[0026] In a 250mL reaction vessel, 50.4g of water, 0.025g of sodium alkylbenzenesulfonate, 0.8g of dispersant, 0.6g of stabilizer, and 0.1g of stability enhancer were successively added under stirring conditions, stirred to dissolve and disperse evenly, and the water phase was heated to 80°C; Dissolve 0.075g of oleic acid in 48g of oil phase, then slowly pour the oil phase at 90°C into the water phase under high-speed stirring, and stir until it is completely emulsified to obtain an emulsion for water blocking.

[0027] Af...

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PUM

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Abstract

The invention discloses a water plugging emulsion and a preparation method thereof. The water plugging emulsion contains an oil phase, an emulsifier, a dispersing agent, a stabilizer and a stability enhancer. The preparation method comprises the following steps: dissolving and dispersing the components in water under stirring conditions, heating, slowly pouring the 60-110-DEG C oil phase into a water phase, and completely emulsifying by high-speed stirring. After being injected into the stratum, the water plugging emulsion has high stability, can effectively plug the water layer, does not have the plugging action on crude oil, and is capable of lowering the water content in the production well output liquid and enhancing the crude oil yield.

Description

technical field [0001] The invention relates to the field of oil development, and more specifically, to an emulsion used for oil well water plugging in the oil field development process and a preparation method thereof. Background technique [0002] At present, most oilfields at home and abroad are developed by water injection. In the middle and later stages of development, the injected water will enter the production well along the fractures and high-permeability strips, causing the water content of the produced fluid to be too high and even the production well to be flooded. water costs and reduces crude oil production. [0003] Water plugging is a simple and effective measure to increase crude oil production. At present, there are mainly mechanical and chemical methods. The mechanical method of water plugging is only suitable for oil wells with clear water formation and a certain thickness of interlayer between the water layer and the oil layer, and requires good cementi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/50
CPCC09K8/50
Inventor 马涛谭中良周国华赵淑霞王强崔茂蕾卢刚
Owner CHINA PETROLEUM & CHEM CORP
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