Multi-hydrogen acid system suitable for reservoir plugging-removing acidification and preparing method thereof

A multi-hydrogen acid and system technology, applied in the field of acidizing fluid, can solve the problems of slow pressure drop, long construction time, difficulty in satisfying deep formation plugging removal, etc., and achieve the effect of strong absorption and supply capacity

Inactive Publication Date: 2019-05-21
北京国海能源技术研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many composition systems have been used for reservoir acidification transformation. Among these composition systems, most of them are based on hydrochloric acid and the mixture of hydrochloric acid and hydrofluoric acid. These acid solutions have strong acid activity, fast corrosion speed and good effect. characteristics, but it is not conducive to the deep corrosion of acid liquid. Although some acid liquid systems have achieved a certain slowing effect by adding various additives on the basis of the original hydrochloric acid and the mixture of hydrochloric acid and hydrofluoric...

Method used

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  • Multi-hydrogen acid system suitable for reservoir plugging-removing acidification and preparing method thereof
  • Multi-hydrogen acid system suitable for reservoir plugging-removing acidification and preparing method thereof

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preparation example Construction

[0019] A method for preparing a polyhydric acid system suitable for reservoir deblocking acidification, the preparation method comprising the following steps:

[0020] Step 1: Prepare the multi-effect additive: add the water in the multi-effect additive into the container with stirring, start the stirring device, add fluorocarbon surfactant, potassium amine triacetate and potassium chloride in sequence, and stir the above materials evenly, Made into multi-effect additives;

[0021] Step 2: Preparation of corrosion inhibitor: place propynyl alcohol in a container, slowly add benzylpyridine to make corrosion inhibitor; the way of slow addition is stirring while adding, until the addition of benzylpyridine is complete;

[0022] Step 3: Add water into the container with stirring, start the stirring device, and at normal temperature and pressure, add the corrosion inhibitor, active agent, expansion agent configured in step 2, multi-effect additive prepared in step 1, multi- Hydrog...

Embodiment 1

[0025] A polyhydric acid system suitable for reservoir deblocking and acidification, comprising the following raw materials in parts by weight: hydrochloric acid: 30 parts, polyhydric acid: 7 parts, multi-effect additive: 3 parts, shrinking agent: 2 parts , active agent: 1 part, initiator: 3 parts, corrosion inhibitor: 2 parts and water: 3 parts; Described hydrochloric acid is selected from the industrial hydrochloric acid that HCL content is 28-31%; Described polyhydric acid is lemon acid; the multi-effect additive is a mixture of fluorocarbon surfactant, potassium amine triacetate, potassium chloride and water; the active agent is demulsifier AE1910; the shrinkage agent is methacryloxy Trimethylammonium chloride; the corrosion inhibitor is a mixture of benzylpyridine and propynyl alcohol, and the mass ratio of benzylpyridine to propynyl alcohol is 5:1; the initiator is peracetic acid.

[0026] A method for preparing a polyhydric acid system suitable for reservoir deblocking ...

Embodiment 2

[0031] A polyhydric acid system suitable for deblocking acidification of reservoirs and a preparation method thereof, the polyhydric acid system comprises the following raw materials in parts by weight: hydrochloric acid: 60 parts, polyhydric acid: 12 parts, multi-effect additives: 6 parts, expansion agent: 4 parts, activator: 3 parts, initiator: 8 parts, corrosion inhibitor: 4 parts and water: 52 parts; Described hydrochloric acid is selected from the industrial hydrochloric acid that HCL content is 28-31% The polyhydric acid is phosphoric acid; the multi-effect additive is a mixture of fluorocarbon surfactant, potassium amine triacetate, potassium chloride and water; the active agent is demulsifier 1031; The swelling agent is dimethyl diallyl ammonium chloride; the corrosion inhibitor is a mixture of benzylpyridine and propynol, and the mass ratio of benzylpyridine to propynol is 5:1; the initiator is peracetic acid.

[0032] A method for preparing a polyhydric acid system ...

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Abstract

The invention belongs to a multi-hydrogen acid system suitable for reservoir plugging-removing acidification and a preparing method thereof. The multi-hydrogen acid system is prepared from, by weight,30-60 parts of hydrochloric acid, 7-12 parts of multi-hydrogen acid, 3-6 parts of a multipurpose additive, 2-4 parts of a shrinking agent, 1-3 parts of an activating agent, 3-8 parts of an initiatingagent, 2-4 parts of a corrosion inhibitor and 3-52 parts of water; the hydrochloric acid is selected from industrial hydrochloric acid with the HCL content of 28% to 31%; the multi-hydrogen acid is selected from one of citric acid, phosphoric acid, oxalic acid and sulfuric acid or a mixture of citric acid, phosphoric acid, oxalic acid and sulfuric acid; the multipurpose additive is a mixture of afluorocarbon surfactant, potassium amine triacetate, potassium chloride and water; the activating agent is selected from one of a demulsifying agent AE1910, a demulsifying agent 1031 and polyethenoxyether or a mixture of a demulsifying agent AE1910, a demulsifying agent 1031 and polyethenoxy ether; the initiating agent is peracetic acid. The multi-hydrogen acid system has the advantages that theacid liquor activity, H+ mild releasing and the buffering effect are achieved, and the multi-hydrogen acid system is suitable for reservoir plugging-removing acidification.

Description

technical field [0001] The invention belongs to the technical field of acidizing fluid for increasing production and injection of oilfield reservoirs, and in particular relates to a polyhydric acid system suitable for plugging removal and acidizing of reservoirs and a preparation method thereof. Background technique [0002] In oil and gas exploration and development, acidizing is widely used in the reservoir stimulation of oil wells, water wells and natural gas wells to achieve the purpose of increasing oil and gas production and increasing water injection. At present, many composition systems have been used for reservoir acidification transformation. Among these composition systems, most of them are based on hydrochloric acid and the mixture of hydrochloric acid and hydrofluoric acid. These acid solutions have strong acid activity, fast corrosion speed and good effect. characteristics, but it is not conducive to the deep corrosion of acid liquid. Although some acid liquid ...

Claims

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Application Information

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IPC IPC(8): C09K8/52C09K8/528C09K8/74
Inventor 张春雨姚佩锋
Owner 北京国海能源技术研究院
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