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Method for preparing self-generating foam micelle acid fluid for water injection well

A self-generated foam, water injection well technology, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of secondary formation damage, incomplete flowback, short validity period of measures, etc., and achieves high flowback efficiency and reduced Secondary damage, complete effect of acidification process

Active Publication Date: 2016-04-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a method for preparing water injection well self-generated foam micellar acid solution which overcomes the problems of incomplete flowback of conventional acidification and short effective period of measures caused by secondary damage of formation

Method used

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  • Method for preparing self-generating foam micelle acid fluid for water injection well
  • Method for preparing self-generating foam micelle acid fluid for water injection well
  • Method for preparing self-generating foam micelle acid fluid for water injection well

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A kind of preparation method of self-generated foam micelle acid liquid of water injection well, prepare according to following steps:

[0021] 1) Add concentrated hydrochloric acid with a mass percentage of 15.0% to 20.0% into the acid-resistant container. The concentration of the concentrated hydrochloric acid is 31%, without diluting with water;

[0022] 2) Add additives with a mass percentage of 7.0% to 20.0% to the container where concentrated hydrochloric acid is added in step 1);

[0023] 3) Add hydrofluoric acid with a mass percentage of 3% to 5% to the container in step 2), and the concentration of the hydrofluoric acid is 40%;

[0024] 4) Add distilled water to the container in step 3), and stir well until the acid solution and additives in the container are fully mixed;

[0025] 5) Add foaming agent with a mass percentage of 0.5% to 2.0% to the container in step 4), and stir well;

[0026] 6) Add a foam stabilizer with a mass percentage of 0.5% to 1.0% to t...

Embodiment 2

[0030] A kind of preparation method of self-generated foam micelle acid liquid of water injection well, prepare according to following steps:

[0031] 1) Add concentrated hydrochloric acid with a mass percentage of 15.0% to the acid-resistant container. The concentration of the concentrated hydrochloric acid is 31%, without diluting with water;

[0032] 2) Add 1.0% mass percentage of corrosion inhibitor, 1.0% demulsifier, 10.0% clay stabilizer, 10.0% iron ion stabilizer, 10.0% drainage aid composition;

[0033] 3) Add 3% hydrofluoric acid to the container in step 2), and the concentration of the hydrofluoric acid is 40%;

[0034] 4) Add distilled water to the container in step 3), and stir well until the acid solution in the container is fully mixed with the reagent;

[0035] 5) To the container in step 4), add a foaming agent with a mass percentage of 2.0%. The foaming agent is composed of benzalkonium chloride, fusel alcohol, secondary octanol, and sodium lauryl sulfate in...

Embodiment 3

[0041] A kind of preparation method of self-generated foam micelle acid liquid of water injection well, prepare according to following steps:

[0042] 1) Add concentrated hydrochloric acid with a mass percentage of 20.0% to the acid-resistant container, the concentration of the concentrated hydrochloric acid is 31%, without diluting with water;

[0043] 2) Add 0.5% mass percentage of corrosion inhibitor, 0.5% demulsifier, 2.0% clay stabilizer, 2.0% iron ion stabilizer, 2.0% drainage aid composition;

[0044] 3) Add 5% hydrofluoric acid to the container in step 2), and the concentration of the hydrofluoric acid is 40%;

[0045] 4) Add distilled water to the container in step 3), and stir well until the acid solution in the container is fully mixed with the reagent;

[0046] 5) To the container in step 4), add a foaming agent with a mass percentage of 0.5%. The foaming agent is composed of benzalkonium chloride, fusel alcohol, secondary octanol, and sodium lauryl sulfate at a ...

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Abstract

The invention provides a method for preparing self-generating foam micelle acid fluid for a water injection well. The self-generating foam micelle acid fluid is prepared through the method includes the steps that firstly, concentrated hydrochloric acid with the mass percentage being 15.0-20.0% is added into an acid-resistant container; secondly, an additive with the mass percentage being 7.0-20.0% is added into the container where the concentrated hydrochloric acid is added; thirdly, hydrofluoric acid with the mass percentage being 3-5% is added; fourthly, distilled water is added into the container, the materials are fully stirred till the acid solution and the additive in the container are fully and evenly mixed; fifthly, a foaming agent with the mass percentage being 0.5-2.0% is added into the container, and stirring is conducted fully and evenly; sixthly, a foam stabilizer with the mass percentage being 0.5-1.0% is added into the container and fully and evenly stirred; seventhly, a micelle agent with the mass percentage being 10-15.0% is added into the container and fully and evenly stirred, and the foam micelle acid fluid is obtained. The foam micelle acid fluid can generate foam automatically at the bottom of the well, the aim of blockage removing in depth is achieved, and secondary harm can be reduced. Besides, flowback efficiency is higher, the acidification process can be thorough, and the valid period is prolonged.

Description

technical field [0001] The invention belongs to the technical field of injection water development in oilfields, and in particular relates to a method for preparing self-generated foam micellar acid in water injection wells used in acidification measures for high-pressure under-injection wells in low-permeability oilfields. Background technique [0002] Water injection is an effective means to replenish formation energy and ensure long-term stable production of oilfields. However, some tight reservoirs in Changqing Oilfield have small porosity, low permeability, and poor reservoir connectivity. The incompatibility of minerals and reservoir fluids will cause formation blockage, reduce the water absorption capacity of water injection wells, increase water injection pressure, and reduce reservoir permeability. Insufficient injection, many wells that cannot be injected with water, corresponding to the decline in oil well production, will bring stability to the oil field. big imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/536C09K8/74
CPCC09K8/536C09K8/74C09K2208/12
Inventor 王勇张随望陆小兵隋蕾宋昭杰王尔珍邓志颖于九政王薇何汝贤
Owner PETROCHINA CO LTD