Low-toxicity solid-liquid mixed authigenic acid system and high-temperature carbonate reservoir acidification method

A solid-liquid mixing, self-generating acid technology, applied in chemical instruments and methods, mining fluids, earth-moving drilling, etc. Erosion distance, easy to carry and transport, and the effect of reducing the reaction rate

Active Publication Date: 2020-03-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from this that formaldehyde is mostly used as an initiator in autogenous acid systems to promote the hydrolysis of ammonium chloride to generate acid. However, formaldehyde is highly toxic and has certain hazards to the health of construction workers and the surrounding atmospheric environment when it is on the ground. The acid generation temperature is low, the hydrochloric acid produced is strong acid, the acid rock reaction speed is fast, the acid liquid is consumed earlier, it is difficult to apply to the development of ultra-high temperature reservoirs

Method used

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  • Low-toxicity solid-liquid mixed authigenic acid system and high-temperature carbonate reservoir acidification method
  • Low-toxicity solid-liquid mixed authigenic acid system and high-temperature carbonate reservoir acidification method
  • Low-toxicity solid-liquid mixed authigenic acid system and high-temperature carbonate reservoir acidification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A low-toxic solid-liquid mixed self-generating acid system includes a liquid system and a solid tablet; the liquid system is a mixed aqueous solution of vinyl acetate and vinyl formate, and the mass fractions are 4% and 6% respectively.

[0044] The solid tablet is made of a tablet core composed of weak acid ammonium salt, guar gum, sucrose and magnesium stearate through film coating. The mass percentages of the weak acid ammonium salt, guar gum, and sucrose are respectively 70%, 15%, and 9%, and the balance is magnesium stearate. Wherein, the weak acid ammonium salt is a mixture of ammonium phosphate and ammonium acetate in a mass ratio of 1:0.6.

[0045] Described solid tablet is prepared as follows:

[0046] According to the proportion, take weak acid ammonium salt and guar gum and place them in a container, stir for 5 minutes; add sucrose and magnesium stearate, mix and stir for 5 minutes, and then compact with a single-punch tablet machine to form a tablet core; a...

Embodiment 2

[0049] Embodiment 2: As described in Embodiment 1, the difference is:

[0050]The mass fractions of vinyl acetate and vinyl formate in the liquid system are 6% and 9%, respectively.

[0051] The solid tablet is made of a tablet core composed of weak acid ammonium salt, guar gum, sucrose and magnesium stearate through film coating. The mass percentages of the weak acid ammonium salt, guar gum, and sucrose are respectively 72%, 12%, and 10%, and the balance is magnesium stearate. Wherein, the weak acid ammonium salt is a mixture of ammonium phosphate and ammonium acetate in a mass ratio of 1:0.8.

Embodiment 3

[0052] Embodiment 3: As described in Embodiment 1, the difference is:

[0053] The liquid system is a mixed aqueous solution of vinyl formate and vinyl acetate, with mass fractions of 8% and 7% respectively.

[0054] The solid tablet is made of a tablet core composed of weak acid ammonium salt, guar gum, sucrose and magnesium stearate through film coating. The mass percentages of the weak acid ammonium salt, guar gum, and sucrose are respectively 68%, 13%, and 8%, and the balance is magnesium stearate. Wherein, the weak acid ammonium salt is a mixture of ammonium phosphate and ammonium formate in a mass ratio of 1:1.

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Abstract

The invention relates to a low-toxicity solid-liquid mixed authigenic acid system and a high-temperature carbonate reservoir acidification method. The solid-liquid mixed authigenic acid system comprises a liquid system and a solid tablet, wherein the liquid system comprises organic acid vinyl ester and water, and the solid tablet comprises weak acid ammonium salt, guanidine gum, sucrose and magnesium stearate. The authigenic acid system can prevent aldehyde from volatilizing into air from the ground, and has the advantages of low toxicity and environmental protection; the solid tablet is carried by the liquid system, so that the authigenic acid system still has slowly released acid-generating matrix at the deep part of a high-temperature stratum and can achieve continuous acid generation under the initiation action of aldehyde, thus prolonging the acid etching action distance at high temperature.

Description

technical field [0001] The invention relates to a low-toxic solid-liquid mixed autogenous acid system and a method for acidifying high-temperature carbonate rock reservoirs, belonging to the technical field of oil field chemical autogenous acid systems. Background technique [0002] In the process of carbonate reservoir reconstruction, acid fracturing technology is the main mining measure. For deeply buried strata, higher temperature (>160°C) will cause the acid-rock reaction speed of conventional hydrochloric acid acid solution to be too fast, so that the effective distance of action will be greatly shortened. Although retarded acid systems suitable for high-temperature carbonate reservoirs have been formed, such as cross-linked acid, emulsified acid, foam acid, etc., there are still certain problems in the retarded acid system for ultra-high temperature reservoirs. . For example, the structure of cross-linked acid is unstable at extremely high temperature, the frictio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74E21B43/27
CPCC09K8/74E21B43/26
Inventor 王彦玲巩锦程梁雷刘斌汤龙皓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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