Acidification blocking removal system and preparation method thereof

A system and volume ratio technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high ground injection pressure, high requirements for ground equipment, high viscosity, etc., and achieve increased seepage resistance and excellent interface properties , Improve the effect of shunting efficiency

Pending Publication Date: 2021-12-03
CHINA OILFIELD SERVICES
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  • Description
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  • Application Information

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Problems solved by technology

[0003] Emulsified acid is an emulsion system prepared based on acid liquid. W / O emulsion is mainly used, and the emulsion is used to wrap acid liquid to realize the slow release of acid liquid. However, the viscosity of traditional W / O emulsion is too high, and the ground The injection pressure is too high, which requires higher ground equipment

Method used

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  • Acidification blocking removal system and preparation method thereof
  • Acidification blocking removal system and preparation method thereof
  • Acidification blocking removal system and preparation method thereof

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preparation example Construction

[0049] The present application provides a preparation method of an acidification plugging removal system, the acidification plugging removal system is a W / O / W type multiple emulsion, and the method includes the following steps:

[0050] (1) Oil phase preparation: ultrasonically disperse hydrophobic nano-silica particles and surfactants in oil to obtain an oil phase;

[0051] (2) Preparation of inner water phase: dissolving acid, corrosion inhibitor and chelating agent in water to obtain inner water phase;

[0052] (3) W / O type primary phase preparation: the oil phase of step (1) and the inner water phase of step (2) are mixed at a high speed and homogeneously in the ratio of volume ratio (5-2): (5-8), Get W / O type initial phase;

[0053] (4) Preparation of the external water phase: dissolving the water-soluble emulsifier in water to obtain the external water phase;

[0054] (5) The W / O type primary phase of step (3) and the external water phase of step (4) are mixed at a hig...

Embodiment 1

[0060] The preparation of the W / O / W type multiple emulsion acidification plugging removal system of this application includes the following steps:

[0061] (1) Oil phase preparation: the surfactant Span60 and hydrophobic nano-silica particles are dissolved in the oil by ultrasonic dispersion to obtain the oil phase; wherein, based on the total mass of the oil phase obtained, the mass fraction of Span60 is 3% , the mass fraction of the hydrophobic nano-silica particles is 0.3%, and the particle size of the hydrophobic nano-silica particles is 30nm; the oil is styrene tar;

[0062] (2) Preparation of internal water phase: based on the total mass of the internal water phase obtained, the mass fraction is 20% hydrochloric acid, 0.5% corrosion inhibitor and 0.5% hydroxyethylidene diphosphonic acid dissolved in water to obtain internal water phase; wherein, the hydrochloric acid is prepared by diluting with 38% analytically pure hydrochloric acid, the corrosion inhibitor is a commer...

Embodiment 2

[0067] The preparation of the W / O / W type multiple emulsion acidification plugging removal system of this application includes the following steps:

[0068] (1) Oil phase preparation: the surfactant Span60 and hydrophobic nano-silica particles are dissolved in the oil by ultrasonic dispersion to obtain an oil phase; wherein, based on the total mass of the oil phase obtained, the mass fraction of Span60 is 1% 1. The mass fraction of the hydrophobic nano-silica particles is 0.3%, and the particle diameter of the hydrophobic nano-silica particles is 30nm; the oil is styrene tar;

[0069] (2) Preparation of internal water phase: based on the total mass of the internal water phase obtained, the mass fraction is 5% hydrochloric acid, 2% corrosion inhibitor and 2% hydroxyethylidene diphosphonic acid dissolved in water to obtain internal water Phase, wherein, the hydrochloric acid is prepared by diluting with 38% analytically pure hydrochloric acid, the corrosion inhibitor is a commerc...

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Abstract

The invention discloses an acidification blocking removal system and a preparation method thereof. The system is a W / O / W type multiple emulsion and is composed of a W / O type initial phase and an outer water phase, the W / O type initial phase comprises an oil phase and an inner water phase according to the volume ratio of (5-2): (5-8), and the inner water phase comprises by mass, 5-20% of an acid, 0.5-2% of a corrosion inhibitor and 0.5-2% of a chelating agent. The oil phase comprises, by mass, 0.3-3% of hydrophobic nano silicon dioxide particles, 1-3% of a surfactant, and the balance of oil; the external water phase comprises, by mass, 0.1-0.5% of a water-soluble emulsifier. According to the invention, the viscosity of crude oil in the stratum can be reduced, the shunting efficiency is improved, a better plug removal effect on heterogeneous reservoirs is achieved, the oil phase dosage and cost are reduced, and the shunting plug removal effect is improved.

Description

technical field [0001] The invention relates to a W / O / W type multiple emulsion acidification plugging removal system and a preparation method thereof, belonging to the technical field of oil field stimulation. Background technique [0002] In the same well and layer with multiple acidizing treatment measures, due to the difference in reservoir permeability, a large amount of acid liquid enters the high-permeability layer, resulting in the failure of acidizing treatment for low-permeability reservoirs, which aggravates the heterogeneity of the reservoir properties, making it difficult to recover crude oil in low-permeability reservoirs. Therefore, a key to the success of repeated acidification is to divert the acid liquid to the low-permeability layer and improve the plugging removal efficiency of the low-permeability layer. [0003] Emulsified acid is an emulsion system prepared based on acid liquid. W / O emulsion is mainly used, and the acid liquid is wrapped by emulsion to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/74
CPCC09K8/52C09K8/74C09K2208/10C09K2208/14
Inventor 荣新明张洪菁王春林李翔奎智斌冯浦涌杜勋丁文刚童志能吴广刘洋孙鹏飞
Owner CHINA OILFIELD SERVICES
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