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Quick dissolving solution for soluble bridge plugs and preparation method thereof

A dissolving liquid and fast technology, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve the problems of difficulty in popularizing and using soluble bridge plugs and slow drainage speed, and accelerate electrochemical corrosion , Increased electrolyte concentration, excellent environmental friendliness effect

Active Publication Date: 2019-05-17
四川长宁天然气开发有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, in the process of dissolution and flowback of soluble bridge plugs in the later stage, due to the incomplete dissolution or the mixing of solid impurities and proppants produced after dissolution, the wellbore will be blocked for a second time, resulting in slow drainage speed, which is harmful to soluble bridge plugs. The promotion and use of plugs has caused certain difficulties

Method used

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  • Quick dissolving solution for soluble bridge plugs and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A rapid dissolving solution for soluble bridge plugs, comprising: 10 parts of ammonium chloroacetate, 5 parts of formaldehyde, 10 parts of organic acid, 15 parts of chloride ion salt, 5 parts of water-soluble corrosion inhibitor, and anion fluorocarbon in parts by weight 1 part of surfactant, 30 parts of clear water, the organic acid is sulfamic acid, the chloride ion salt is ammonium chloride, the water-soluble corrosion inhibitor is tolyl benzotriazole, the anionic fluorocarbon The surfactant is a fluoroalkyl carboxylate.

[0032] A preparation method for a fast dissolving solution for a soluble bridge plug, comprising the following steps:

[0033] (1) Take the chloride ion salt and formaldehyde of the above-mentioned parts by weight and dissolve them in the above-mentioned clear water, heat to 80° C., stir and reflux, and react for 2 hours to obtain the reaction product A. The ratio of the chloride ion salt to formaldehyde is 2: 1;

[0034] (2) Add the above-mentio...

Embodiment 2

[0037] A quick dissolving solution for soluble bridge plugs, comprising: 14 parts by weight of ammonium chloroacetate, 7.5 parts of formaldehyde, 12 parts of organic acid, 17.5 parts of chloride ion salt, 6.5 parts of water-soluble corrosion inhibitor, anionic fluorocarbon 1.5 parts of surfactants, 42 parts of clear water, the organic acid is citric acid, the chloride ion salt is potassium chloride, the water-soluble corrosion inhibitor is sodium mercaptobenzothiazole, and the anionic fluorocarbon surfactant For fluoroalkyl sulfonate.

[0038] A preparation method for a fast dissolving solution for a soluble bridge plug, comprising the following steps:

[0039] (1) Take the chloride ion salt and formaldehyde of the above-mentioned parts by weight and dissolve them in the above-mentioned clear water, heat to 85° C., stir and reflux, and react for 1.5 hours to obtain the reaction product A. The ratio of the chloride ion salt to formaldehyde is 2: 1;

[0040] (2) Add the above-...

Embodiment 3

[0043] A rapid dissolving solution for soluble bridge plugs, comprising, by weight parts: 18 parts of ammonium chloroacetate, 10 parts of formaldehyde, 14 parts of organic acid, 20 parts of chloride ion salt, 8 parts of water-soluble corrosion inhibitor, anionic fluorocarbon 2 parts of surfactants, 54 parts of clear water, the organic acid is lactic acid, the chloride ion salt is potassium chloride, the water-soluble corrosion inhibitor is sodium mercaptobenzothiazole, and the anionic fluorocarbon surfactant is Fluoroalkylphosphates.

[0044] A preparation method for a fast dissolving solution for a soluble bridge plug, comprising the following steps:

[0045] (1) Take the chloride ion salt and formaldehyde of the above-mentioned parts by weight and dissolve them in the above-mentioned clear water, heat to 90° C., stir and reflux, and react for 1 hour to obtain the reaction product A. The ratio of the chloride ion salt to formaldehyde is 3: 1;

[0046] (2) Add the above-ment...

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Abstract

The invention discloses a quick dissolving solution for soluble bridge plugs and a preparation method thereof. The quick dissolving solution for soluble bridge plugs is prepared form, by weight, 10-18parts of ammonium chloroacetate, 5-10 parts of formaldehyde, 10-14 parts of organic acid, 15-20 parts of chloride ion salt, 5-8 parts of water-soluble corrosion inhibitor, 1-2 parts of anionic fluorocarbon surfactant and 30-54 parts of water. The quick dissolving liquid contains the organic retarding acid, the chloride ion salt, the corrosion inhibitor and a discharge aiding agent, and can generate a large amount of hydrogen ions and chloride ions under the conditions of formation temperature and pressure, so that the mineralization degree of the formation water is improved, the electrolyte concentration is increased, the electrochemical corrosion is accelerated, and the bridge plugs are quickly dissolved without causing corrosion to oil casings and cables.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a fast dissolving solution for soluble bridge plugs and a preparation method thereof. Background technique [0002] Shale gas refers to unconventional natural gas that occurs in organic-rich shale-dominated reservoir rock series. It is continuously generated biochemical gas, thermogenic gas or a mixture of both, and can exist in natural fractures in a free state. It exists in the surface of kerogen and clay particles in an adsorbed state, and a very small amount is stored in kerogen and asphaltene in a dissolved state. The proportion of free gas is generally 20% to 85%. [0003] Soluble bridge plugs are a new layered and segmented reconstruction tool for shale gas fracturing, using new magnesium-aluminum alloy materials. At present, conventional shale gas exploitation mainly uses soluble bridge plugs with an outer diameter of 103mm, with a length of 560mm and a weight of 6....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/22E21B33/134
CPCE21B33/134C23F1/22
Inventor 吴春林谢军佘朝毅肖勇军赵昊刘望何伟王彬张灵王学强缪云洪玉奎杨海
Owner 四川长宁天然气开发有限责任公司
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