Low-filtration-loss blockage relieving fluid for acidification oilfield well and preparation method thereof

A technology for oilfield wells and fluid loss, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low illite content, low porosity and permeability, and difficulty in removing blockages in the Yanchang Formation oil layer, and achieves the Good adaptability and technical promotion value, strong active penetration ability, and the effect of reducing secondary damage

Inactive Publication Date: 2018-09-21
兰州凯宏中原石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] ⑤ The illite content in the Yanchang Formation oil layer is low, generally less than 5%, so the fluoboric acid system is not suitable for acidizing the oil layer;
[0028] ⑥The rocks in Yanchang oil layer have strong diagenesis, compact cementation, low porosity and permeability, high shale content in sandstone, and poor acid penetration ability in acidizing operations. Part of the acid solubility of acid fluid is consumed near the wellbore, making it difficult to remove blockages deep in the formation

Method used

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  • Low-filtration-loss blockage relieving fluid for acidification oilfield well and preparation method thereof
  • Low-filtration-loss blockage relieving fluid for acidification oilfield well and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] A kind of plug-removing fluid for acidizing oil field with low fluid loss, it is made up of the raw material of following parts by weight:

[0055] Organic acid 30, compound acid main body 120, corrosion inhibitor 3, micellar acid stabilizer solution 35, surfactant 1.5, sodium tripolyphosphate 2.

[0056] Described composite acid body is made up of the raw material of following weight part:

[0057] Nitrilotriacetic acid 1.8, aluminum ammonium sulfate 1.5, 31% hydrochloric acid 45, calcium acetylacetonate 1.5, 95% acetic acid 20, hydrofluoric acid 2.5, thiodipropionic acid 0.2, sorbitan laurate 0.1, Xylene 0.2, ethylene glycol butyl ether 2.4, ethanol 0.9, water 110.

[0058] The organic acid is a mixture of sulfamic acid and chloroacetic acid in a weight ratio of 15:3.5.

[0059] Described corrosion inhibitor is sodium myristate soap.

[0060] The surfactant is fatty alcohol polyoxyethylene ether sodium sulfate.

[0061] Described micellar acid stabilizer solution ...

Embodiment 2

[0069] A kind of plug-removing fluid for acidizing oil field with low fluid loss, it is made up of the raw material of following parts by weight:

[0070] Organic acid 40, compound acid main body 130, corrosion inhibitor 4, micellar acid stabilizer solution 40, surfactant 2, sodium tripolyphosphate 3.

[0071] Described composite acid body is made up of the raw material of following weight part:

[0072] Nitrilotriacetic acid 2, aluminum ammonium sulfate 2, 31% hydrochloric acid 50, calcium acetylacetonate 2, 97% acetic acid 15, hydrofluoric acid 3, thiodipropionic acid 0.4, sorbitan laurate 0.2, Xylene 0.2, ethylene glycol butyl ether 3, ethanol 1, water 120.

[0073] The organic acid described is a mixture of sulfamic acid and chloroacetic acid in a weight ratio of 20:4.

[0074] Described corrosion inhibitor is sodium myristate soap.

[0075] Described surfactant is alkyl sulfonate.

[0076] Described micellar acid stabilizer solution is made up of the raw material of f...

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Abstract

The invention discloses low-filtration-loss blockage relieving fluid for acidification oilfield well. The blockage relieving fluid is prepared from the following raw materials in parts by weight: 20-40 parts of organic acid, 110-130 parts of composite acid body, 2-4 parts of corrosion inhibitor, 30-40 parts of micellar acid stabilizer solution, 1-2 parts of surfactant and 1-3 parts of sodium tripolyphosphate. The reaction speed of the blockage relieving fluid with quartz and feldspar minerals is higher than that of the blockage relieving fluid with clay minerals, so that acid liquid not only can eliminate the formation pollution, but also can well improve the original permeability of the formation; the acid liquor system has good adaptability with the formation, and secondary precipitatedacid slag is not produced in a formation treatment process, so that new pollution is not caused.

Description

technical field [0001] The invention belongs to the field of plugging-removing fluids, and in particular relates to a plugging-removing fluid for low fluid loss acidification oil field wells and a preparation method thereof. Background technique [0002] Acidizing is one of the most effective production stimulation measures in the process of oilfield development and production. Its purpose is to remove acid-soluble blockages near the wellbore and in the pores of the oil layer, expand the circulation channels of the oil layer, and improve the permeability of the oil layer. However, due to the characteristics of rock structure and the existence of acid-sensitive minerals, if the choice of acid solution or process method is unreasonable, it will also cause damage to the formation, which is called acid-sensitive damage. [0003] The clay mineral assemblage in the oil layers of the Yanchang Formation is very simple, with chlorite as the absolute dominant, and the cement is mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/78C09K8/528
CPCC09K8/528C09K8/78
Inventor 袁海滨程宝生张慧敏袁建国
Owner 兰州凯宏中原石油科技有限公司
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