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A low-permeability reservoir water injection well pretreatment agent and preparation method thereof

A pretreatment agent, a technology for water injection wells, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems such as the inability to effectively reduce pressure and increase injection, cannot be used at the same time, low construction efficiency, etc., achieve anti-swelling and The effect of removing solid phase blockage, improving construction efficiency and reducing water injection pressure

Active Publication Date: 2018-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, surfactants, anti-swelling agents, and acidifiers have poor compatibility, and cannot be used at the same time, but can only be injected sequentially, resulting in low construction efficiency, and can not effectively achieve the purpose of reducing pressure and increasing injection

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  • A low-permeability reservoir water injection well pretreatment agent and preparation method thereof

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preparation example Construction

[0039] On the other hand, the embodiment of the present invention also provides a preparation method of the above-mentioned low-permeability oil reservoir water injection well pretreatment agent, including: according to the mass percentage of each component in the low-permeability oil reservoir water injection well pretreatment agent, Mix surfactant, ammonium chloride, ethanol, small molecule cationic polymer, ethylene glycol monobutyl ether, hydrochloric acid, hydrofluoric acid, corrosion inhibitor, iron ion stabilizer and water to obtain low permeability reservoir water injection well pretreatment agent. It can be seen that the method is simple and easy to operate, which is conducive to improving construction efficiency.

[0040] Preferably, in order to improve the preparation efficiency of the pretreatment agent and reduce the preparation time, the method includes: according to the mass percentage content of each component in the pretreatment agent for water injection wells...

Embodiment 1

[0051] This embodiment provides a low-permeability oil reservoir water injection well pretreatment agent, including the following components in mass percentage: 0.6% surfactant, 2% ammonium chloride, 5% ethanol, dimethyl diene chloride Propyl ammonium 2%, ethylene glycol monobutyl ether 1%, hydrochloric acid 12%, hydrofluoric acid 1%, corrosion inhibitor 2%, iron ion stabilizer 2%, and the balance is water. Wherein, the surfactant comprises the following components in mass percentage: 85% of fluorocarbon surfactant, 3% of cocamidopropyl betaine, and 12% of coconut oil fatty acid diethanolamide.

[0052] The preparation method of this pretreatment agent is as follows:

[0053] Preparation of the first solution: According to the mass percentage of each component in the pretreatment agent, add ammonium chloride and part of water into the stirring tank, stir until the ammonium chloride is completely dissolved in the water, and prepare the first solution.

[0054] Prepare the seco...

Embodiment 2

[0057] This embodiment provides a low-permeability reservoir water injection well pretreatment agent, including the following components in mass percentage: fluorocarbon surfactant 0.8%, ammonium chloride 1%, ethanol 2%, dimethyl chloride 4% of diallyl ammonium, 5% of ethylene glycol monobutyl ether, 10% of hydrochloric acid, 3% of hydrofluoric acid, 2% of corrosion inhibitor, 1% of iron ion stabilizer, and the balance is water. Wherein, the surfactant includes the following components in mass percentage: 93% of fluorocarbon surfactant, 7% of coconut oil fatty acid diethanolamide.

[0058] The preparation method of this pretreatment agent is as follows:

[0059] Preparation of the first solution: According to the mass percentage of each component in the pretreatment agent, add ammonium chloride and part of water into the stirring tank, stir until the ammonium chloride is completely dissolved in the water, and prepare the first solution.

[0060] Preparation of the second solu...

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Abstract

The invention discloses a pre-treating agent for a water injection well of a low-permeability reservoir and a manufacturing method of the pre-treating agent, and belongs to the technical field of water injection well development of an oil field. The pre-treating agent comprises the following components, by mass percentage, 0.3-0.8% of a surfactant, 1-2% of ammonium chloride, 2-5% of ethanol, 2-5% of a micro-molecular cationic polymer, 1-5% of ethylene glycol monobutyl ether, 10-15% of hydrochloric acid, 1-3% of hydrofluoric acid, 2-4% of a corrosion inhibitor, and 1-2% of an iron-ion stabilizing agent, with the balance being water. The surfactant comprises, by mass percentage, 75-90% of a fluorocarbon surfactant, with the balance being betaine and / or fatty acid diethanol amide. Components in the pre-treating agent match each other well and can be used at the same time. Through adoption of the pre-treating agent, multiple slugs are effectively form one slug through pre-treatment before casting of the water injection well, and the oil-water interfacial tension is reduced to or below 3*10<-4> mN / m. The water injection pressure is reduced, and the effect of preventing swelling and relieving solid blocking is achieved. Pressure reduction and injection increase are effectively achieved, and the construction efficiency is obviously increased.

Description

technical field [0001] The invention relates to the technical field of oilfield water injection development, in particular to a low-permeability oil reservoir water injection well pretreatment agent and a preparation method thereof. Background technique [0002] In recent years, the development of low permeability oil and gas fields has received more and more attention at home and abroad. Among the recent proven reserves and cumulative proven unproduced reserves, the proportion of low-permeability reservoir reserves is as high as 65% to 70%, and the development of low-permeability reservoirs mainly adopts water flooding development methods (including investment in new wells and oil well transfer injection) . [0003] Water injection development refers to the use of water injection wells to inject water into the oil layer to supplement and maintain the pressure of the oil layer. In the process of water injection development, there is a common problem that the water injectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/584C09K8/506C09K8/52
Inventor 于梦红徐建华王远征黄坚毅刘京罗成朱好阳周光林
Owner PETROCHINA CO LTD
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