A low-toxic solid-liquid mixed authigenic acid system and a method for acidifying high-temperature carbonate rock reservoirs

A technology of solid-liquid mixing and self-generating acid, which is applied to chemical instruments and methods, mining fluids, earthwork drilling and mining, etc., can solve problems such as health and surrounding atmospheric environment hazards, high formaldehyde toxicity, and fast acid-rock reaction speed, etc., to achieve extended Effects of acid etching action distance, reduction of reaction rate, and stable chemical properties

Active Publication Date: 2021-10-26
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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  • A low-toxic solid-liquid mixed authigenic acid system and a method for acidifying high-temperature carbonate rock reservoirs
  • A low-toxic solid-liquid mixed authigenic acid system and a method for acidifying high-temperature carbonate rock reservoirs
  • A low-toxic solid-liquid mixed authigenic acid system and a method for acidifying high-temperature carbonate rock reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A low-toxic solid-liquid mixed anhydric acid system, including a liquid system and a solid tablet; the liquid system is a mixed aqueous solution of vinyl acetate and a methylene carnate, with a mass fraction of 4%, 6%, respectively.

[0044] The solid tablet is made of a core of a weak acid ammonium salt, a chloride, sucrose and magnesium stearate, is made of a film coating. The mass percentage of ammonium salt, gum, and sucrose is 70%, 15%, 9%, respectively, and the rest is magnesium stearate. Wherein, the ammonium salt is mixed in ammonium phosphate and ammonium acetate in mass ratio of 1: 0.6.

[0045] The solid tablet is prepared as follows:

[0046] In proportion, the supersetrate salt is dispropsed, and the gluanate is placed in a container, stirred for 5 min; add sucrose and magnesium stearate, after mixing stirring 5, then use a single punching piece to reduce the core; at 60 ° C temperature, will The resulting core is placed in a hydroxypropylmethylcellulose soluti...

Embodiment 2

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

[0050]The mass fraction of vinyl acetate and methylene esters in the liquid system is 6%, 9%, respectively.

[0051] The solid tablet is made of a core of a weak acid ammonium salt, a chloride, sucrose and magnesium stearate, is made of a film coating. The mass percentage of the ammonium salt, gum, and sucrose is 72%, 12%, 10%, respectively, and the rest is magnesium stearate. Wherein, the ammonium salt is mixed in ammonium phosphate and ammonium acetate in mass ratio of 1: 0.8.

Embodiment 3

[0052] Example 3: As described in Example 1, the different is:

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

[0054] The solid tablet is made of a core of a weak acid ammonium salt, a chloride, sucrose and magnesium stearate, is made of a film coating. The mass percentage of ammonium salt, gum, and sucrose is 68%, 13%, 8%, respectively, and the rest is magnesium stearate. Wherein, the ammonium salt is mixed in ammonium phosphate and ammonium formate by mass than 1: 1.

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Abstract

The invention relates to a low-toxic solid-liquid mixed authigenic acid system and a method for acidifying high-temperature carbonate rock reservoirs. The solid-liquid mixed self-generating acid system includes a liquid system and a solid tablet, the liquid system is organic acid vinyl ester and water, and the solid tablet includes weak acid ammonium salt, guar gum, sucrose and magnesium stearate. The authigenic acid system of the present invention can avoid the volatilization of aldehydes from the ground into the air, and has the advantages of low toxicity and environmental protection; through the liquid system carrying solid tablets, the authigenic acid system still has acid-generating precursors slowly released in the depths of high-temperature formations and the aldehydes Sustained acid generation under the action of initiation, prolonging the distance of acid etching at high temperature.

Description

Technical field [0001] The present invention relates to a method of hyperovic solid-liquid mixing autogenic acid system and high temperature carbonate reservoir acidification, belonging to the technical sector of oilfield chemical autonomous acid system. Background technique [0002] During the modification of carbonate reservoirs, acidification fracturing technology is the main mining measures. For the deep formation, higher temperatures (> 160 ° C) can result in an acid rock response rate of conventional hydrochloride acids to be too fast, so that the effectiveness distance is greatly shortened. At present, although it has formed a bleeddle-acid system suitable for high temperature carbonate reservoirs such as crosslinking acid, emulsified acid, foamic acid, etc., but for the high temperature reservoir, each bleeding system still has a certain problem. . For example, the crosslinking acid is unstable at a high temperature, and the emulsion is high, which is prone to phase tr...

Claims

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Application Information

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Patent Type & Authority Patents(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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