Preparation method and application of an anti-emulsifier for oilfield fracturing acidification

An anti-emulsifier and oilfield fracturing technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of stratum pore throat blockage, lower oil relative permeability, poor stability, etc., and achieve fluid production and Effects of increased oil production, enhanced oil recovery, and excellent interfacial properties

Active Publication Date: 2021-06-15
山东滨州昱诚化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These anti-emulsifiers can be adsorbed on the interface between crude oil and acid, but their branched structure cannot stabilize any type of emulsion, and the droplets formed during the acidification process are easy to coalesce and have poor stability
In addition, ionic surfactants are also often used to prevent emulsification in the acidification of crude oil, but their application is limited. Cationic surfactants are not suitable for the acidification of sandstone oil and gas reservoirs. Relative permeability; anionic surfactants should not be used for acidizing oil wells with high salinity formations where water and oil come out together, as the two will react and cause formation pore throat blockage
[0004] In summary, the existing anti-emulsifiers have obvious selectivity, and the anti-emulsifiers with excellent anti-emulsification effect on some oil fields or oil wells may not be effective on other oil fields or oil wells

Method used

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  • Preparation method and application of an anti-emulsifier for oilfield fracturing acidification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] An anti-emulsifier for oil field fracturing acidification, comprising component A and component B, the mass ratio of component A and component B is 9:11;

[0045] The preparation method of this anti-emulsifying agent comprises the following steps:

[0046] S1: Preparation of Component A:

[0047] S101: Add 4kg of phenolic aldehyde resin and 2kg of potassium persulfate into a reactor with a stirring device, vacuumize, mix evenly and heat to 135°C to keep it warm.

[0048] S102: Pass 88kg ethylene oxide into the reactor and fully react, the reaction time is 25min,

[0049] S103: Add 2kg of potassium persulfate again to the reactor, mix evenly and heat, then feed 304kg of propylene oxide into the reactor and fully react, the reaction time is 25min, to obtain a dry agent;

[0050] S104: Add 600kg of ethylene glycol butyl ether after the dry agent of component A cools down to below 60°C to obtain component A with a dry agent content of 40%;

[0051] S2: Preparation of Com...

Embodiment 2

[0058] An anti-emulsifier for oil field fracturing acidification, comprising component A and component B, the mass ratio of component A and component B is 3:7;

[0059] The preparation method of this anti-emulsifying agent comprises the following steps:

[0060] S1: Preparation of Component A:

[0061] S101: Add 5kg of phenolic aldehyde resin and 2.5kg of potassium persulfate into a reactor with a stirring device, vacuumize, mix evenly and heat to 125°C to keep it warm.

[0062] S102: Pass 130g ethylene oxide into the reactor and fully react, the reaction time is 20min,

[0063] S103: Add 2.5kg potassium persulfate again to the reactor, mix evenly and heat, then pass 310kg propylene oxide into the reactor and fully react, the reaction time is 20min, to obtain dry agent;

[0064] S104: Add 550kg of ethylene glycol butyl ether after the dry agent of component A cools down to below 60°C to obtain component A with a dry agent content of 45%;

[0065] S2: Preparation of Componen...

Embodiment 3

[0072] An anti-emulsifier for oil field fracturing acidification, comprising component A and component B, the mass ratio of component A and component B is 2:3;

[0073] The preparation method of this anti-emulsifying agent comprises the following steps:

[0074] S1: Preparation of Component A:

[0075] S101: Add 9kg of phenolic aldehyde resin and 3kg of potassium persulfate into a reactor with a stirring device, vacuumize, mix evenly and heat to 130°C for heat preservation.

[0076] S102: Pass 70kg of ethylene oxide into the reactor and fully react, the reaction time is 20min,

[0077] S103: Add 3kg of potassium persulfate again to the reactor, mix evenly and heat, then feed 265kg of propylene oxide into the reactor and fully react, the reaction time is 20min, to obtain dry agent;

[0078] S104: Add 650kg of ethylene glycol butyl ether after the dry agent of component A cools down to below 60°C to obtain component A with a dry agent content of 35%;

[0079] S2: Preparation ...

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Abstract

The invention relates to the technical field of petroleum exploitation, in particular to a preparation method and application of an anti-emulsifier for oil field fracturing acidification, and the preparation method of the anti-emulsifier comprises the following steps: preparation of component A, preparation of component B And the uniform mixing of component A and component B; the application includes being used to prevent emulsification in oil field fracturing and acidizing operations and used as an oil displacement agent in oil field three-component composite flooding or binary composite flooding operations. In the present invention, component A and component B are compounded and used, and the dehydration rate can reach more than 90%, so it is very suitable for use as an anti-emulsifier in oilfield acidizing operations; the anti-emulsifier prepared by the preparation method of the present invention can be used in the crude oil phase The surface forms a very low interfacial tension, which can reach 10 ‑4 mN / m, so it can also be used as an oil displacement agent in the oil field ASP flooding and binary compound flooding operations.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a preparation method and application of an anti-emulsifier for oilfield fracturing acidification. Background technique [0002] In the process of oilfield production fluid treatment, we often face the problem of demulsification and dehydration of various complex oil-water emulsions. Acidizing operation refers to injecting acid liquid into the bottom layer through oil and water wells, dissolving plugs (such as clay, inorganic minerals, etc.) The permeability of the layer, so as to achieve the measure of increasing the production of the oil field. After the acidizing operation, since the surfactant in the acid, the rock particles with a particle size of less than 1 μm produced by acidification, and the natural surfactant in the crude oil all have a certain emulsifying effect, the crude oil and the acid will form an emulsion, which will affect the recovery of acid-po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C08G65/28
CPCC08G65/2627C08G65/2639C09K8/74
Inventor 王俊德孙立军宋月晴
Owner 山东滨州昱诚化工科技有限公司
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