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Deep low-damage acidizing fluid

A technology of acidizing fluid and depth, applied in the field of acidizing fluid, can solve problems such as excessive reservoir corrosion, particle migration, and reservoir particle loosening, and achieve the effects of strong field operability, increased action distance, and improved acidizing effect

Inactive Publication Date: 2013-10-02
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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] Below in conjunction with specific embodiment and concrete demonstration experiment the present invention will be further described:

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

[0048] DH 6%;

[0049] Fluoboric acid 3%;

[0050] Lauryl trimethyl ammonium chloride 3%;

[0051] HCl 4%;

[0052] Corrosion inhibitor 1%;

[0053] Anti-swelling agent 1.5%;

[0054] Demulsifier 1%;

[0055] Water 80.5%;

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

[0057] The corrosion inhibitor in the above-mentioned acidizing solution composition, its preparation method is:

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

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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 oil field additive used in the process of increasing production and injection in an oil field, in particular to an acidizing fluid used in acidizing operations. Background technique [0002] Acidizing fluid is an essential material basis for acidizing operations, and its quality is directly related to the success or failure of acidizing operations, and plays a key role in increasing production and injection. In order to protect the formation, improve the acidizing effect, and maximize the effect of the acid solution, it is necessary to comprehensively screen the formula of the acid solution according to the characteristics of the formation and the functions and properties of the acid solution and additives, so that it can meet the requirements of the acidizing process and be compatible with the formation to achieve The purpose of effectively removing formation pollution. [0003] For high-porosity and high-permeability rese...

Claims

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Application Information

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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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