Water-in-oil type emulsion water shutoff agent based on ethylene tar and preparation method and application thereof

An ethylene tar, water-in-oil type technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor erosion resistance, high cost, increased cost, etc., to improve economic added value, stable The effect of improving sexuality and high aroma

Active Publication Date: 2021-07-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the W / O emulsion separated from the W / O / W type multiple emulsion provided by the invention can only be stable for 24 hours at room temperature, which cannot meet the long-term plugging requirements on site.
[0005] In summary, the oil phase of the water-in-oil emulsion water shutoff agent used in the oil field is mostly heavy oil, and the cost is high; and the preparation is cumbersome, which further increases the cost; at the same time, it is difficult to maintain long-term stability under high-temperature formation conditions and Good plugging effect, and poor erosion resistance

Method used

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  • Water-in-oil type emulsion water shutoff agent based on ethylene tar and preparation method and application thereof
  • Water-in-oil type emulsion water shutoff agent based on ethylene tar and preparation method and application thereof
  • Water-in-oil type emulsion water shutoff agent based on ethylene tar and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A water-in-oil emulsion water-blocking agent based on ethylene tar, comprising the following components in percentage by weight: calcium dodecylbenzenesulfonate 2%, sorbitan monooleate 1%, polyoxyethylene sorbitol Anhydride monostearate 0.1%, nano silicon dioxide AEROSIL R812S 1.0%, water 58.9%, ethylene tar 37%.

[0031] Wherein, the calcium dodecylbenzenesulfonate is an oil-soluble anionic surfactant; the described sorbitan monooleate is an oil-soluble nonionic surfactant, polyoxyethylene sorbitan monohard The fatty acid ester is a co-surfactant; the modified nanoparticles are hydrophobic nano silicon dioxide AEROSIL R812S.

[0032] The preparation method comprises the following steps:

[0033] (1) Add oil-soluble surfactant calcium dodecylbenzenesulfonate, sorbitan monooleate, and modified nanoparticle R812S to ethylene tar, stir and mix evenly in a constant temperature water bath at 70°C, to obtain activated ethylene tar;

[0034] (2) Add the co-surfactant polyox...

Embodiment 2

[0037] A water-in-oil emulsion water-blocking agent based on ethylene tar, comprising the following components in percentage by weight: calcium dodecylbenzenesulfonate 2%, sorbitan monooleate 1%, polyoxyethylene sorbitol Anhydride monostearate 0.1%, nano silicon dioxide AEROSIL R812S 1.5%, water 58.4%, ethylene tar 37%.

[0038] The preparation method is the same as in Example 1 to obtain a water-in-oil emulsion water blocking agent based on ethylene tar.

Embodiment 3

[0040] A water-in-oil emulsion water-blocking agent based on ethylene tar, comprising the following components in percentage by weight: calcium dodecylbenzenesulfonate 2%, sorbitan monooleate 1%, polyoxyethylene sorbitol Anhydride monostearate 0.1%, nano silicon dioxide AEROSIL R812S 2.0%, water 57.9%, ethylene tar 37%.

[0041] The preparation method is the same as in Example 1 to obtain a water-in-oil emulsion water blocking agent based on ethylene tar.

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Abstract

The invention provides a water-in-oil emulsion water shutoff agent based on ethylene tar and a preparation method and application thereof. The water-in-oil type emulsion water plugging agent based on ethylene tar comprises the following components in percentage by weight: 1.0%-2.0% of an oil soluble anionic surfactant, 1.0%-2.0% of a nonionic surfactant, 0.05%-0.15% of a cosurfactant, 1.0%-2.0% of modified nanoparticles, 30%-45% of ethylene tar and the balance of water. According to the emulsion water shutoff agent, the good shutoff effect of the water-in-oil type emulsion water shutoff agent is guaranteed, the economic additional value of ethylene tar can be increased, and the cost of the water-in-oil type emulsion water shutoff agent is saved; and the prepared water-in-oil emulsion water shutoff agent has good high-temperature stability, good shutoff effect at high temperature and good scouring resistance effect.

Description

technical field [0001] The invention relates to a water-in-oil emulsion water shutoff agent based on ethylene tar, a preparation method and application thereof, and belongs to the technical field of oil well water shutoff. Background technique [0002] In the process of oilfield water injection development, due to the heterogeneity of the formation, water will rush along the high-permeability layer, resulting in an increase in the water production of the oil well, and the low or no use of the medium-low permeability layer. Water plugging and profile control of oil and water wells is an important technical means to control water, stabilize oil and improve water flooding efficiency in severely heterogeneous reservoirs. In oil and water well plugging control technology, oil well water plugging technology can be divided into two categories: non-selective water plugging technology and selective water plugging technology. Selective water shutoff technology plays an important role...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/502C09K8/82
CPCC09K8/502C09K8/82C09K2208/10
Inventor 裴海华刘冬鑫张贵才张菅郑家桢蒋平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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