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A kind of self-generated foam micellar acid solution of water injection well

A technology of self-generated foam and micellar acid, which is applied in the directions of drilling compositions, chemical instruments and methods, can solve the problems of secondary damage to the formation, incomplete flowback, and short validity period of measures, and achieves high flowback efficiency. , reduce secondary damage, and the effect of the acidification process is complete

Active Publication Date: 2018-06-01
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 self-generated foam micellar acid solution for water injection wells that overcomes the problems of incomplete flowback in conventional acidification and short effective periods of measures caused by secondary damage to formations.

Method used

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  • A kind of self-generated foam micellar acid solution of water injection well
  • A kind of self-generated foam micellar acid solution of water injection well
  • A kind of self-generated foam micellar acid solution of water injection well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A self-generated foam micellar acid solution for water injection wells is characterized in that it is composed of the following mass percentage components:

[0024] Hydrochloric acid: 15.0%~20.0%;

[0025] Hydrofluoric acid: 3.0% to 5.0%;

[0026] Foaming agent: 0.5% to 2.0%;

[0027] Foam stabilizer: 0.5% to 1.0%;

[0028] Micellar agent: 10.0%~15.0%;

[0029] Corrosion inhibitor: 0.5% to 1.0%;

[0030] Clay stabilizer: 2.0% to 10.0%;

[0031] Iron ion stabilizer: 2.0% to 10.0%;

[0032] Drainage aid: 2.0% to 10.0%;

[0033] The rest is distilled water.

[0034] In the work, the foamy micellar acid solution provided by this embodiment, in the construction process, the construction shows that the average water injection pressure drops by 4.5MPa, the single well water absorption capacity increases by 25m3 / d, the effective rate of the measures is 100.0%, and the effective period of the measures is 200 days The above shows that the self-generating foam micellar aci...

Embodiment 2

[0036] A water injection well self-generated foam micellar acid solution is prepared according to the following steps:

[0037] 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;

[0038] 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;

[0039] 3) Add 3% hydrofluoric acid to the container in step 2), and the concentration of the hydrofluoric acid is 40%;

[0040] 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;

[0041] 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 a ratio of 1:1: Prepa...

Embodiment 3

[0052] A water injection well self-generated foam micellar acid solution is prepared according to the following steps:

[0053] 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;

[0054] 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;

[0055] 3) Add 5% hydrofluoric acid to the container in step 2), and the concentration of the hydrofluoric acid is 40%;

[0056] 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;

[0057] 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 ratio of 1:1: Prepare ...

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Abstract

The invention provides autogenetic foam micelle acid liquid for water injection well. The autogenetic foam micelle acid liquid comprises the following components in percentage by mass: 15.0%-20.0% of hydrochloric acid, 3.0%-5.0% of hydrofluoric acid, 0.5%-2.0% of a foaming agent, 0.5%-1.0% of a foam stabilizer, 10.0%-15.0% of a micelle agent. 0.5%-1.0% of a corrosion inhibitor, 2.0%-10.0% of a clay stabilizer, 2.0%-10.0% of an iron ion stabilizer, 2.0%-10.0% of a clean-up additive and the balance of distilled water. According to the autogenetic foam micelle acid liquid, foams are autogenetically formed at the bottom of a well, so that the blockage can be eliminated at a deep part, the secondary damage can be reduced, the flow-back efficiency is relatively high, the acidization process is relatively thorough, and the period of validity 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 Patents(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
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
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