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Composite acid for oil-water well in oil field and preparation method thereof

An oil-water well and compound acid technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of large amount of acid solution, fast acid solution consumption, short acidification distance, etc., so as to reduce the acidification speed and improve the Permeability, effect of slowing liquid phase movement

Active Publication Date: 2022-01-11
胜利油田新海兴达实业集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more commonly used acidizing plugging removal reagent is earth acid (hydrochloric acid mixed with hydrofluoric acid). However, earth acid has a fast acidification speed, and the acid solution is consumed quickly during operation, and the residual acid solution after the reaction will form precipitation again in the far-reaching formation. Therefore, when using conventional earth acid for acidification, there will be problems such as short acidification distance and large amount of acid solution during acidification.

Method used

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  • Composite acid for oil-water well in oil field and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Oilfield oil well composite acid, the preparation method thereof contains the following steps:

[0023] It is weighed with half of the amount of water to add a mixed container, and then hydrochloric acid, boric acid, amino sulfonic acid, citric acid, acetic acid, amino trimetinic acid, stir well at a rate of 100 r / min, and mixture A; to mix the mixture A Diethylene glycol monobutyl ether and fluorine-containing surfactant, mixed uniformly, then add macromolecular composite Fc, dri 80, and then add the remaining amount of water, stirring at a temperature of 450 r / min at a temperature of 60 ° C. Uniform, static defoaming, to obtain the oilwater well composite acid.

[0024] Among them, the weight percentage is measured, 5% hydrochloride, 5% boric acid, 2% acetic acid, 2% amino sulfonic acid, 5% amino trimetonate, 8% monolecular complex Fc, and tray 80 4%, SIFAST @ SF-333 6%, diethylene glycol monobutyl ether 2%, water 57%.

[0025] The mid-molecular composite FC preparati...

Embodiment 2

[0027] Oilfield oil well composite acid, the preparation method thereof contains the following steps:

[0028] It is weighed with half of the amount of water to add a mixed container, and then hydrochloric acid, boric acid, amino sulfonic acid, citric acid, acetic acid, amino trimetinic acid, stir well at a rate of 100 r / min, and mixture A; to mix the mixture A Diethylene glycol monobutyl ether and fluorine-containing surfactant, mixed uniformly, then add macromolecular composite Fc, dri 80, and then add the remaining amount of water, stirring at a temperature of 450 r / min at a temperature of 60 ° C. Uniform, static defoaming, to obtain the oilwater well composite acid.

[0029] Among them, a weight percentage is measured, 3% of hydrochloride, 3% boric acid, 2%, citric acid 2%, amino sulfonic acid, 10%, macromolecular composite Fc, 2%, macromolecular composite Fc 10%, macromolecular composite Fc 5%, SIFAST @ SF-333 7%, diethylene glycol moni-ether 4%, 49% water.

[0030] The m...

Embodiment 3

[0032] Oilfield oil well composite acid, the preparation method thereof contains the following steps:

[0033] It is weighed with half of the amount of water to add a mixed container, and then hydrochloric acid, boric acid, amino sulfonic acid, citric acid, acetic acid, amino trimetinic acid, stir well at a rate of 100 r / min, and mixture A; to mix the mixture A Diethylene glycol monobutyl ether and fluorine-containing surfactant, mixed uniformly, then add macromolecular composite Fc, dri 80, and then add the remaining amount of water, stirring at a temperature of 450 r / min at a temperature of 60 ° C. Uniform, static defoaming, to obtain the oilwater well composite acid.

[0034] Among them, in weight percentage, the compound acid contains 15%, 2% boric acid, 1%, citric acid by 1%, amino sulfonic acid 4%, macromolecular composite Fc 15%. 80 80%, SIFAST @ SF-333 10%, diethylene glycol moni-ether 5%, and 37% water.

[0035] The mid-molecular composite Fc preparation method includ...

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Abstract

The invention relates to the technical field of chemical descaling and dredging reagents for oil fields, in particular to a composite acid for an oil-water well in an oil field and a preparation method thereof. According to the invention, a macromolecular compound FC is prepared by adopting a specific preparation method, and Span 80 is added to be compounded and cooperated with the macromolecular compound FC, so a composite acid composition with excellent performance and used for the oil-water well in the oil field is obtained by scientifically adjusting the types and the dosage / proportion of the raw materials in the composite acid. The composite acid disclosed by the invention not only has excellent descaling and unblocking effects, but also has relatively low acidification speed, so excessive consumption of acid liquor in the initial stage of acidification operation is avoided, and the operation requirements of acidizing deep and far strata can be met.

Description

Technical field [0001] The present invention relates to the field of chemical descaling reagents in oilfield, and in particular, therefore, a compound acid and preparation method thereof for oilfield oil wells. Background technique [0002] During the long-term development of oilfield, due to the increase in stratum pressure and temperature, injection of water and foreign fluid, the influence of the aggregation of bacteria metabolites, thereof, etc. Organic matter, etc. And inorganic blockage. In the actual operation, as the injection water continues to advance, the seepage resistance increases rapidly, the injection pressure is rapid, and the water injection is reduced, so that the oil field can not be effectively improved. For the above blockage, the commonly used inter-blocking method is acid to solve, even if the interplable agent containing a concentration of acid and other chemical reagents can effectively dissolve the formation clay mineral, suspended, remove bacteria, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/524C09K8/528
CPCC09K8/74C09K8/524C09K8/528
Inventor 任沼琦贺金辉李向达王松
Owner 胜利油田新海兴达实业集团有限责任公司
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