Retardance and low damage acid solution system for high temperature condensate oil gas reservoir acidification

An oil and gas reservoir and retarding technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing acidification effect, poor compatibility, long hydrolysis time, etc., achieve long effective action time, small environmental pollution, The effect of short hydrolysis time

Inactive Publication Date: 2013-07-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problems of the organic ester acid liquid systems that have been used at present are strong toxicity, poor compatibility, long hydrolysis time, and low hydrolysis efficiency. water lock
Inorganic acid liquid systems in condensate gas reservoirs, such as hydrochloric acid, hydrofluoric acid, and fluoboric acid, react quickly at high temperatures, seriously reducing the acidizing effect, and easily form secondary precipitation under high temperature conditions. The corrosion of the pipe string and other wellsite equipment by the liquid is serious. For the reservoir with difficult flowback, the residual acid flowback is not complete, which will cause serious damage to the reservoir.

Method used

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  • Retardance and low damage acid solution system for high temperature condensate oil gas reservoir acidification
  • Retardance and low damage acid solution system for high temperature condensate oil gas reservoir acidification
  • Retardance and low damage acid solution system for high temperature condensate oil gas reservoir acidification

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Experimental program
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Effect test

Embodiment 1

[0025] Weigh 10 parts by weight of dimethyl carbonate, 0.5-3 parts by weight of hydrofluoric acid, 0.05 parts by weight of N-methyldiethanolamine, 1 part by weight of nonylphenol polyoxyethylene ether corrosion inhibitor, and 1 part by weight of hydroxylamine hydrochloride iron ion Stabilizer, 1 part by weight of organic cationic quaternary ammonium salt polymer clay stabilizer, 2 parts by weight of dodecyltrimethylammonium chloride drainage aid, 80-82 parts by weight of water, stirring rapidly at room temperature until fully mixed, Configured as an acidified formula system.

Embodiment 2

[0027] Weigh 10 parts by weight of dimethyl carbonate, 6-12 parts by weight of fluoroboric acid, 0.05 parts by weight of N-methyldiethanolamine, 1 part by weight of nonylphenol polyoxyethylene ether corrosion inhibitor, and 1 part by weight of hydroxylamine hydrochloride for iron ion stabilization Agent, 1 part by weight of organic cationic quaternary ammonium salt polymer clay stabilizer, 2 parts by weight of dodecyltrimethylammonium chloride drainage aid, 80-82 parts by weight of water, stir rapidly at room temperature until fully mixed, and configure into an acidified formula system.

Embodiment 3

[0029] Weigh 10 parts by weight of dimethyl carbonate and 0.05 parts by weight of N-methyldiethanolamine, and at 140°C, the hydrolysis effect can be seen figure 1 , The hydrolysis rate reaches 80% within 4 hours, and can produce 8% equivalent of methanol and 5% equivalent of carbon dioxide, which helps to relieve the water lock damage of condensate oil and gas reservoirs and promote acid flowback.

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Abstract

The present invention discloses a retardance and low damage acid solution system for high temperature condensate oil gas reservoir acidification. The acid solution system is suitable for acidification modification of high temperature deep well, particularly condensate gas reservoir, and comprises the following components, by weight, 0.5-3 parts of hydrofluoric acid or 6-12 parts of fluoroboric acid, 8-10 parts of an organic ester, 0.01-0.05 part of a catalyst, 0.1-1 part of a corrosion inhibitor, 0.1-1 part of an iron ion stabilizer, 0.1-1 part of a clay stabilizer, 1-2 parts of a cleanup additive, and 80-100 parts of water. According to the present invention, effects of retardance and corrosion inhibition of the acid solution system can be well achieved at a high temperature, and water blocking can be released and acid solution backflow can be easily achieved with the finally produced methanol and the carbon dioxide.

Description

technical field [0001] The invention relates to an acidizing working fluid for oil and gas wells, which is suitable for acidizing reformation of high-temperature condensate oil and gas reservoirs above 120°C. Background technique [0002] Acidizing can effectively remove the damage to the reservoir during drilling and completion operations, restore or improve the formation permeability, and is an important measure to increase the production of oil and gas reservoirs. At present, my country's onshore oilfield development has a trend of high temperature and deep well development. The temperature of the reservoir is getting higher and higher, and the development is becoming more and more difficult. The conventional acid system has a small treatment range, serious secondary damage, and relapse due to the rapid reaction with the rock. Due to the slow discharge rate and fast corrosion rate, it is impossible to effectively realize high-temperature deep well acidizing operations, esp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 刘平礼兰夕堂赵立强李年银罗志锋杜娟山金城高建崇刘义刚孟祥海刘长龙
Owner SOUTHWEST PETROLEUM UNIV
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