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Oil-water interface suspension water control emulsion as well as preparation method and application thereof

A technology of oil-water interface and water emulsion, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor long-term stability and poor effect, and achieve good stability, good effect, and the effect of inhibiting bottom water breakthrough

Active Publication Date: 2021-09-03
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary to provide an oil-water interface suspension water-controlling emulsion, its preparation method and application, in order to solve the technical problems of poor bottom water coning inhibition effect and poor long-term stability of blocking agents in the prior art

Method used

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preparation example Construction

[0022] A second aspect of the present invention provides a method for preparing an oil-water interface suspended water-controlling emulsion, comprising the following steps:

[0023] S1, dissolving the emulsifier into simulated formation water to obtain an emulsifier solution;

[0024] S2, uniformly mixing vinyl acetate monomer, styrene monomer, crosslinking agent, initiator, and polymerization retarder to obtain compound monomer;

[0025] S3. Emulsifying the compounded monomers with an emulsifier solution to obtain an oil-water interface suspended water-controlling emulsion. The present invention has no limitation on the order of the above steps S1 and S2, and those skilled in the art can select according to needs.

[0026] In the present invention, after the plugging agent solution is emulsified into an oil-in-water emulsion and injected into the formation, the emulsion is neither soluble in crude oil nor in bottom water. After the emulsion reaches the target layer, the oil...

Embodiment 1

[0033] Add 0.075g tetradecyltrimethylammonium chloride to 74.405g simulated formation water, stir evenly, make it dissolve completely, obtain emulsifier solution; then add 7.5g vinyl acetate, 17.5g styrene in the graduated cylinder, simultaneously Add 0.25 g of divinylbenzene, 0.25 g of di-tert-butyl peroxide, and 0.02 g of nitroxide free radical piperidinol to obtain a compound monomer; emulsify the compound monomer with an emulsifier solution to obtain an oil-water interface suspension water-controlling emulsion . The emulsion was cured at a temperature of 130°C for 6 hours to form a resin with a compressive strength of 32MPa and a density of 1.02g / cm 3 , 130 ℃ aging for 180 days, the mass retention rate is 91.6%.

Embodiment 2

[0035] Add 0.075g of tetradecyltrimethylammonium chloride to 74.405g of simulated formation water, stir evenly, make it dissolve completely, and obtain an emulsifier solution; then add 5g of vinyl acetate and 20g of styrene into the graduated cylinder, and simultaneously add two 0.25 g of vinylbenzene, 0.25 g of di-tert-butyl peroxide, and 0.02 g of nitroxide free radical piperidinol were used to obtain compounded monomers; the compounded monomers were emulsified with an emulsifier solution to obtain an oil-water interface suspended water-controlling emulsion. The emulsion was cured at a temperature of 130°C for 6 hours to form a resin with a compressive strength of 41MPa and a density of 1.09g / cm 3 , 130 ℃ aging for 180 days, the mass retention rate is 95.1%.

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Abstract

The invention discloses an oil-water interface suspension water control emulsion as well as a preparation method and application thereof. The oil-water interface suspension water control emulsion is prepared from the following raw materials in parts by weight: 0 to 7.5 parts of a vinyl acetate monomer, 17.5 to 25 parts of a styrene monomer, 0.25 to 0.5 part of a cross-linking agent, 0.25 to 0.375 part of an initiator, 0.02 to 0.025 part of a retarder, and 0.075 to 0.375 part of an emulsifier, with the balance being water, and the sum of the weight parts of the components being 100. A plugging agent solution is emulsified into the oil-in-water emulsion to be injected into the stratum, the oil-in-water emulsion is demulsified and then polymerized, and the problems that a water-based plugging agent is easily dissolved in bottom water, and an oil-based plugging agent is easily dissolved in crude oil and cannot form a water plugging partition plate are solved; the emulsion is easy to prepare, and a generated resin partition plate is good in water plugging effect, good in stability and high in construction efficiency; the curing time of the emulsion is adjustable within 3-6 hours, and the emulsion can be conveniently injected into a stratum, so that bottom water inrush is inhibited, and the field requirements are met.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to an oil-water interface suspended water-controlling emulsion, its preparation method and application. Background technique [0002] Tahe fracture-vuggy reservoirs are mainly developed in the vertical well mode, and the wells with a water cut higher than 80% account for 30% of the total wells. Because the oil layer is thin, the bottom water is strong, the effect of lifting up to avoid water is poor, and there is no replacement production layer in the later stage, it is difficult to treat the oil well. The bottom water of the bottom water reservoir is in full contact with the oil-bearing area, and there is no obvious interlayer between the oil layer and the bottom water layer. Therefore, during the development process, there will be bottom water coning, and serious water flooding will occur in some oil fields, making the development form increasingly severe. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F212/36C08F218/08C09K8/512
CPCC08F212/08C09K8/512C08F218/08C08F212/36
Inventor 陈立峰毛志强刘靓曾慧勇陈亚东李岗
Owner YANGTZE UNIVERSITY
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