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Nano plugging agent for water plugging of oil well and preparation method thereof

A nano-blocking agent and oil well water plugging technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult water plugging, difficult section blocking, thin oil layers, etc., to increase salt resistance, Good thermal stability and little influence of rheology

Pending Publication Date: 2021-07-27
陕西久鑫石油工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the fact that the water-producing formations of ultra-high water-cut oil wells are unknown, and the oil layers are thin, the well conditions are poor, the water plugging is difficult, and the block is difficult. Therefore, we propose a nano-sealing agent for oil well water plugging and its preparation method

Method used

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  • Nano plugging agent for water plugging of oil well and preparation method thereof
  • Nano plugging agent for water plugging of oil well and preparation method thereof

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Effect test

Embodiment 1

[0031] The present invention provides such as figure 1 Shown is a nano-blocking agent for oil well water plugging, the plugging agent is prepared from the following raw materials:

[0032] The raw materials are: 15 parts of sol, 6 parts of polyacrylamide, 1.6 parts of nano silicon dioxide, 0.42 parts of emulsifier, 3 parts of sodium chloride, 0.35 parts of NS-6 and 0.6 parts of tackifier.

[0033] Specifically in the present invention: the emulsifier is fatty acid soap, and by adding the emulsifier, the API and high-temperature and high-pressure fluid loss of the drilling fluid can be significantly reduced.

[0034] Specifically in the present invention: the sol is prepared from the following raw materials in parts by weight: 7 parts of metal alkoxide, 4 parts of water, 2 parts of solvent, and 0.8 part of catalyst. Metal alkoxide is the most suitable raw material for the sol-gel method, providing metal elements , to improve the strength of the sol, water is the necessary raw ...

Embodiment 2

[0052] A nano plugging agent for oil well water plugging, the plugging agent is prepared from the following raw materials:

[0053] The ratio of raw materials by weight is: 20 parts of sol, 7 parts of polyacrylamide, 2.6 parts of nano silicon dioxide, 0.56 parts of emulsifier, 3.5 parts of sodium chloride, 0.45 parts of NS-6 and 1.3 parts of tackifier.

[0054] Specifically in the present invention: the emulsifier is any one or more mixtures of fatty acid soaps, alkyl sulfates, alkylbenzenesulfonates and phosphates.

[0055] Specifically in the present invention: the sol is prepared from the following raw materials in parts by weight: 8 parts of metal alkoxide, 6 parts of water, 4 parts of solvent, and 0.9 part of catalyst.

[0056] Specifically in the present invention: the solvent is butanol, and the catalyst is succinic acid and maleic acid.

[0057] A preparation method of nano plugging agent for oil well water plugging, comprising the following steps:

[0058] Step 1. A...

Embodiment 3

[0069] A nano plugging agent for oil well water plugging, the plugging agent is prepared from the following raw materials:

[0070] Raw materials in parts by weight are: sol 25 parts, polyacrylamide 8 parts, nano silicon dioxide 3.6 parts, emulsifier 0.68 parts, sodium chloride 4 parts, NS-6: 0.55 parts and tackifier 3.4 parts.

[0071] Specifically in the present invention: the emulsifier is any one or more mixtures of fatty acid soaps, alkyl sulfates, alkylbenzenesulfonates and phosphates.

[0072] Specifically in the present invention: the sol is prepared from the following raw materials in parts by weight: 9 parts of metal alkoxide, 8 parts of water, 6 parts of solvent, and 1.5 parts of catalyst.

[0073] The present invention is specific: the solvent is ethylene oxide, and the catalyst is hydrochloric acid.

[0074] A preparation method of nano plugging agent for oil well water plugging, comprising the following steps:

[0075] Step 1. Add the sol and polyacrylamide int...

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Abstract

The invention discloses a nano plugging agent for water plugging of an oil well and a preparation method of the nano plugging agent. The plugging agent is prepared from the following raw materials in parts by weight: 15 to 25 parts of sol, 6 to 8 parts of polyacrylamide, 1.6 to 3.6 parts of nano silicon dioxide, 0.42 to 0.68 part of an emulsifier, 3 to 4 parts of sodium chloride, 0.35 to 0.55 part of NS-6 and 0.6 to 3.4 parts of a tackifier. According to the plugging agent, firstly, sol is matched with polyacrylamide, the sol is used as a front edge, a gel section plug can improve the plugging capacity near a shaft, the plugging agent is more suitable for early-stage water plugging or wells with few production sections and small thickness, the effect of adjusting the oil-water mobility ratio is achieved, water fingering is limited, nano silicon dioxide is matched, high-strength gel is used for plugging, the fluid channeling of water and the reverse drainage of sol are controlled, and a better water plugging effect is obtained.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a nano-blocking agent for oil well water plugging and a preparation method thereof. Background technique [0002] Water production from oil and gas wells is a common problem in the process of oilfield development, especially in the water injection development method. With the advancement of the water edge, due to serious formation heterogeneity, different oil-water mobility ratios, and improper development plans and measures, etc., Both can lead to faster rise of water cut in the oil field, resulting in premature water flooding of the oil layer and lower recovery of the oil field. At present, many oil fields in the world have entered the medium-high water-cut period one after another, but the underground recoverable reserves are still relatively large. The main oil fields in my country have also entered the medium-high water-cut period, and now only 62% of the reserves produced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/504C09K8/506C09K8/508C09K8/516
CPCC09K8/5083C09K8/5045C09K8/516C09K8/506C09K2208/10
Inventor 李亮
Owner 陕西久鑫石油工程技术有限公司
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