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Deep low damage acidizing fluid

An acidizing fluid and depth technology, applied in the field of acidizing fluid, can solve problems such as excessive reservoir corrosion, particle migration, and reservoir particle loosening, and achieve strong on-site operability, increased action distance, and improved pore-permeability conditions Effect

Inactive Publication Date: 2016-03-30
NORTHEAST GASOLINEEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For high-porosity and high-permeability reservoirs, due to the large depth of damage, if the conventional acid system and acidizing process are used, the scope of acidizing treatment is limited, and the purpose of deep plugging removal cannot be achieved; and it may cause excessive dissolution of the reservoir, making the rock Structural damage causes loose reservoir particles, resulting in particle migration and sand production, and may even lead to reservoir collapse in severe cases

Method used

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Embodiment Construction

[0046] The present invention will be further explained below in conjunction with specific examples and specific proof experiments:

[0047] The following proves that the deep and low-damage acidification solution used in the experiment is based on the total weight of the acidification solution and its composition is:

[0048] DH6%;

[0049] Fluoroboric acid 3%;

[0050] Dodecyl trimethyl ammonium chloride 3%;

[0051] HCl4%;

[0052] Corrosion inhibitor 1%;

[0053] Anti-swelling agent 1.5%;

[0054] Demulsifier 1%;

[0055] 80.5% of water;

[0056] The DH in the composition of the acidification solution is compounded by oxalic acid, benzenesulfonic acid and sulfamic acid in a molar ratio of 2:1:1.

[0057] The preparation method of the corrosion inhibitor in the above-mentioned acidification liquid composition is:

[0058] a) Add 129g of quinoline to a four-necked flask equipped with a stirrer, reflux condenser and thermometer, and start heating;

[0059] b) When the temperature rises to 90°C,...

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Abstract

The invention discloses a deep low-damage acidizing fluid which solves the problem that the existing acidizing fluid has a great damage to formation. The acidizing fluid comprises the following components by taking the total weight of the acidizing fluid as a reference: 5-7% of DH, 2-5% of fluoboric acid, 3% of dodecyl trimethyl ammonium chloride, 3-6% of HCl, 1% of corrosion inhibitor, 1.5% of anti-swelling agent, 1% of demulsifying agent, and the balance of water. The acidizing fluid keeps the strength of acid, and has a certain retardance action, so that acid has a low pH value and longer reaction time in a reaction system, an action distance is increased, an acidizing effect is more obvious, and the damage to the formation is reduced effectively.

Description

Technical field [0001] The invention relates to an oilfield auxiliary used in the process of increasing production and injection of an oilfield, in particular to an acidizing liquid used in an acidizing operation. Background technique [0002] Acidizing liquid is an indispensable material basis for acidizing operations. Its quality is directly related to the success or failure of acidizing operations and plays a key role in the effect of increasing production and injection. In order to protect the formation, improve the effect of acidification, and maximize the effect of the acid solution, it is necessary to comprehensively screen the acid solution formula according to the characteristics of the formation and the role and performance of the acid solution and additives to meet the requirements of the acidification process and be compatible with the formation to achieve The purpose of effectively removing ground pollution. [0003] For high-porosity and high-permeability oil reservo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/72
Inventor 王继刚刘庆旺范振忠赵景原金姗万家瑰
Owner NORTHEAST GASOLINEEUM UNIV
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