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Viscous oil emulsion phase-inversion profile control water blockoff

A technology of profile control, water plugging, and oil-in-water emulsion, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc., and can solve problems such as restrictions on popularization and application and limited use effects

Inactive Publication Date: 2003-02-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The second is heavy oil-in-water profile control and water plugging. The heavy oil is made into a heavy oil-in-water emulsion. After being injected into the formation, it breaks in the water layer to form a high-viscosity heavy oil, which produces great flow resistance and inhibits water flow. Layers of water, it relies on the viscosity of the heavy oil itself to block the water, the viscosity of the oil-in-water emulsion is low when it is injected, and it is easy to inject, but due to the influence of the viscosity of the heavy oil itself, the use effect is limited
Due to the limitations of the above methods, their application is limited

Method used

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Embodiment Construction

[0006] The specific composition and implementation process of the present invention will be described in detail below in conjunction with the embodiments.

[0007] This embodiment is applicable to the working condition where the formation temperature is 65°C to 70°C, and the composition of the emulsifier used is: OP-21: 30%, Tween-60: 20%, Span-80: 10%, sodium carbonate: 20%, Sodium carboxylate: 20%.

[0008] The phase inversion agent is: OP-4: 10%, solid powder bentonite: 90%.

[0009] Mix 70% of heavy oil at a temperature of 100°C to 110°C with 30% of water at a temperature of 80°C to 90°C, add a prepared emulsifier for emulsification, and the amount of emulsifier is 0.5% to 1% (in the entire emulsification content in the oil system) to obtain an oil-in-water emulsion.

[0010] In the above-mentioned oil-in-water emulsion that has been produced, add a phase inversion agent with a content of 3% to 10% and mix evenly, inject it into the ground with a pump, and after entering...

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Abstract

The present invention provides a viscous crude emulsion phase-converting profile control water-plugging method and its phase-converting agent. In the viscous crude system 0.4-1.0% of oil in water emulsion and 3%-10% of phase-converting agent are added, then injected into formation to implement said ivnented method. The oil in water emulsion is a mixturwe of non-ionic surfactants of OP series. Tween series, Span series and sodium carboxylate, etc. and inorganic salts of sodium carbonate, etc. and the phase-converting agent is a mixture of oil-soluble surfactants of OP series or Span series or non-ionic surfactants or organic acid ester, etc. and rosin or asphalt powder or coal powder or bentonite, etc. Said invention developes a effective phase-converting agent, and can implement profile control water-plugging function.

Description

Technical field: [0001] The invention relates to profile control and water shutoff technology in oil exploitation. Background technique: [0002] Viscous oil is a better selective profile control and water shutoff agent. It will not harm the oil layer. It is the only recyclable profile control and water shutoff agent. It has been used for decades. It mainly uses two Two methods of application: one is active heavy oil profile control and water plugging, which is to add water-in-oil emulsifier to heavy oil, and then inject it into the formation. When it encounters water in the formation, it will produce a high-viscosity water-in-oil emulsion , so as to increase the flow resistance of water, through the adsorption of emulsifiers and surface active substances in heavy oil such as asphaltene, colloid, naphthenic acid, etc. in the formation, change the permeability of rocks, reduce the relative permeability of water, and milky The liquid produces the Jamin effect in the pore thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
Inventor 范维玉陈树坤南国枝杨孟龙刘兴玉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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