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Anti-scaling multi-hydrogen retarded acid for highly argillaceous sandstone reservoir

A kind of argillaceous sandstone and retarded acid technology, which is applied in the field of anti-scaling multi-hydrogen retarded acid system, can solve the problems that the reaction speed of clay is difficult to control, and cannot really realize the deep acidification of high-shale reservoirs, so as to improve the subdivision The effect of development, the effect of preventing scale-forming salts from scaling and clogging formations, and reducing the reaction speed

Active Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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  • Description
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Problems solved by technology

However, it is difficult to control the reaction rate of hydrofluoric acid (HF) with clay in high-shale reservoirs, and cannot really achieve deep acidification of high-shale reservoirs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The anti-scaling type multi-hydrogen retarded acid for high shale sandstone reservoir is made of the following raw materials in proportion by weight:

[0025] The mass concentration is 3 kg of 3% hydrochloric acid, 5 kg of amino trimethylene phosphonic acid, 3.5 kg of ammonium bifluoride, 2.2 kg of benzylpyridine chloride corrosion inhibitor, 0.5 kg of acetic acid and citric acid mixture iron ion stabilizer, polyoxydimethyl 1 kg of diallyl ammonium clay stabilizer, 78 kg of water.

Embodiment 2

[0027] The anti-scaling type multi-hydrogen retarded acid for high shale sandstone reservoir is made of the following raw materials in proportion by weight:

[0028] The mass concentration is 5 kg of 5% hydrochloric acid, 3 kg of amino trimethylene phosphonic acid, 3.5 kg of ammonium bifluoride, 1 kg of benzylpyridine chloride corrosion inhibitor, 1 kg of iron ion stabilizer for a mixture of acetic acid and citric acid, and polydimethyloxide 0.2 kg of base diallyl ammonium clay stabilizer, 87 kg of water.

Embodiment 3

[0030] The anti-scaling type multi-hydrogen retarded acid for high shale sandstone reservoir is made of the following raw materials in proportion by weight:

[0031] The mass concentration is 3 kg of 5% hydrochloric acid, 5 kg of amino trimethylene phosphonic acid, 3.5 kg of ammonium bifluoride, 2.2 kg of benzylpyridine chloride corrosion inhibitor, 0.5 kg of acetic acid and citric acid mixture iron ion stabilizer, polyoxydimethyl 1 kg of diallyl ammonium clay stabilizer, 0.3 kg of perfluorooctyl amido-1,2-ethylenemethyl diethyl ammonium iodide demulsifier, and 78 kg of water.

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Abstract

The invention provides an anti-scaling multi-hydrogen retarded acid for a highly argillaceous sandstone reservoir. The retarded acid is prepared from the following raw materials by weight: 3 to 5 parts of hydrochloric acid, 3 to 5 parts of amino trimethylene phosphonic acid, 3.5 to 6 parts of ammonium bifluoride, 1 to 2.2 parts of a corrosion inhibitor, 0.5 to 1 part of a ferric ion stabilizing agent, 0.2 to 1 part of a clay stabilizing agent, 0.3 to 1 part of a de-emulsifier, 0.2 to 1 part of a mutual solvent and 78 to 87 parts of water. The anti-scaling multi-hydrogen retarded acid is used in the petroleum industry to control a reaction speed of hydrofluoric acid and clay so as to realize deep acidization of the highly argillaceous reservoir.

Description

technical field [0001] The invention relates to an acidification preparation of an underground oil layer in the petroleum industry, in particular to an anti-scaling multi-hydrogen retarded acid system suitable for deep acidification of high-shale sandstone reservoirs. Background technique [0002] In the petroleum industry, acidizing is an effective method for increasing the production of oil and gas wells. With the subdivision and development of oilfields, reservoirs with high shale and poor physical properties have become potential targets, with poor water absorption and liquid production capacity. The acidification of high shale reservoirs has too fast reaction speed, short acid action distance, and easy to produce secondary precipitation, etc. question. The polyhydric acid system has a good retarding effect, and this type of polyhydric acid has been disclosed in the following patent documents in the prior art. [0003] Chinese patent ZL200710050148, authorized on Novem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/78
Inventor 马代鑫隋春艳徐赋海王增林牛栓文赵明宸王德山黄敏陈庆华李力行郝恒泽董保春
Owner CHINA PETROLEUM & CHEM CORP
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