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Low-viscosity and low-friction emulsified acid, method for preparing same and application of low-viscosity and low-friction emulsified acid

A technology of emulsified acid and emulsifier, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high viscosity of emulsified acid, achieve the effects of reducing friction, facilitating on-site construction, and good stability

Inactive Publication Date: 2019-01-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN103571450A provides a kind of low-friction emulsified acid liquid for fracturing acidification and its application. Discharge agent composition, but the emulsified acid formed by it has a high viscosity, and the friction can only be reduced by adding a drag reducer
Most of these reports reduce friction by adding drag reducing agent or mixing with other systems, and there is no report on the index of reducing friction by reducing viscosity

Method used

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  • Low-viscosity and low-friction emulsified acid, method for preparing same and application of low-viscosity and low-friction emulsified acid
  • Low-viscosity and low-friction emulsified acid, method for preparing same and application of low-viscosity and low-friction emulsified acid
  • Low-viscosity and low-friction emulsified acid, method for preparing same and application of low-viscosity and low-friction emulsified acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a low viscosity, low friction emulsified acid, the preparation method of which comprises the following steps:

[0044] Preparation of the acid phase:

[0045] Add 0.8 part of corrosion inhibitor and 1.0 part of iron ion stabilizer to 20 wt% hydrochloric acid, stir evenly to obtain acid phase.

[0046] Wherein, the corrosion inhibitor is a compound product of cinnamaldehyde, propargyl alcohol and methanol, and the mass ratio of the three is 20:10:70.

[0047] The iron ion stabilizer is sodium erythorbate.

[0048] Preparation of the oil phase:

[0049] to 0# Add 1.2 parts of emulsifier and 0.2 part of co-emulsifier to the diesel oil, and stir evenly to obtain an oil phase.

[0050] Wherein, the emulsifier is oleic acid diethanolamide, and the co-emulsifier is laurylamine.

[0051] Preparation of emulsified acid (acid oil volume ratio 70:30):

[0052] Stir the oil phase at a stirring speed of 300r / min, slowly pour the acid phase into the oil ...

Embodiment 2

[0054] This embodiment provides a low viscosity, low friction emulsified acid, the preparation method of which comprises the following steps:

[0055] Preparation of the acid phase:

[0056] Add 1.0 parts of corrosion inhibitor and 1.5 parts of iron ion stabilizer to 28wt% hydrochloric acid, stir evenly to obtain acid phase.

[0057] Wherein, the corrosion inhibitor is a compound product of cinnamaldehyde, propargyl alcohol and methanol, and the mass ratio of the three is 20:10:70.

[0058] The iron ion stabilizer is sodium erythorbate.

[0059] Preparation of the oil phase:

[0060] To -10 # Add 1.5 parts of emulsifier and 0.3 parts of co-emulsifier to the diesel oil, and stir evenly to obtain an oil phase.

[0061] Wherein, the emulsifier is oleic acid diethanolamide, and the co-emulsifier is laurylamine.

[0062] Preparation of emulsified acid (acid oil volume ratio 70:30):

[0063] Stir the oil phase at a stirring speed of 400r / min, slowly pour the acid phase into th...

Embodiment 3

[0065] This embodiment provides a low viscosity, low friction emulsified acid, the preparation method of which comprises the following steps:

[0066] Preparation of the acid phase:

[0067] Add 0.8 part of corrosion inhibitor and 1.0 part of iron ion stabilizer to 20 wt% hydrochloric acid, stir evenly to obtain acid phase.

[0068] Wherein, the corrosion inhibitor is a compound product of cinnamaldehyde, propargyl alcohol and methanol, and the mass ratio of the three is 20:10:70.

[0069] The iron ion stabilizer is sodium erythorbate.

[0070] Preparation of the oil phase:

[0071] To -20 # Add 1.3 parts of emulsifier and 0.4 parts of co-emulsifier to the diesel oil, and stir evenly to obtain an oil phase.

[0072] Wherein, the emulsifier is oleic acid diethanolamide, and the co-emulsifier is laurylamine.

[0073] Preparation of emulsified acid (acid oil volume ratio 80:20):

[0074] Stir the oil phase at a stirring speed of 300r / min, slowly pour the acid phase into the...

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Abstract

The invention provides low-viscosity and low-friction emulsified acid, a method for preparing the same and application of the low-viscosity and low-friction emulsified acid. Totally 100 parts of low-viscosity and low-friction emulsified acid comprise, by volume, 60-80 parts of acid phase and 40-20 parts of oil phase. Totally 100 parts of acid phase comprise, by volume, 0.5-1.0 part of corrosion inhibitors, 0.5-2.0 parts of ferric ion stabilizers and the balance hydrochloric acid; totally 100 parts of oil phase comprise, by volume, 1.0-2.0 parts of emulsifiers, 0.1-0.5 part of co-emulsifiers and the balance diesel oil. The low-viscosity and low-friction emulsified acid, the method and the application have the advantages that the low-viscosity and low-friction emulsified acid prepared by theaid of the method is low in viscosity and friction and good in stability, reaction can be carried out on the low-viscosity and low-friction emulsified acid and carbonate rock, accordingly, the acidicrock reaction speeds can be effectively reduced, the action distances of acid liquor can be extended, the injection displacement can be improved, the construction pressures can be lowered, uneven etching can be facilitated, the fracture flow conductivity can be effectively improved, and the single-well production rate further can be increased.

Description

technical field [0001] The invention relates to a low-viscosity, low-friction emulsified acid and a preparation method and application thereof, belonging to the technical field of oil field development. Background technique [0002] Emulsified acid is a dispersion system of oil and acid, usually an acid-in-oil emulsion, the oil phase is diesel, and an emulsifier is added to the diesel; the acid phase is hydrochloric acid, and the additives in the acid include corrosion inhibitors, iron ion stabilizers, and drainage aids. agent. Compared with conventional acids, emulsified acid cannot directly react with the formation due to the blocking of the oil film, and can only pass through a certain period of time. Under the action of the formation temperature, the oil film is destroyed or crushed by mechanical force; Only when the wall is destroyed by adsorption, the acid solution can react with the rock, thereby increasing the action distance of the acid solution. At the same time,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K2208/32
Inventor 王丽伟徐敏杰管保山熊波才博刘萍翟文刘玉婷
Owner PETROCHINA CO LTD
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