Oxidizing composite acid deep acidizing plugging removal method used for acidizing plugging removal of water injection well

A compound acid and oxidizing technology, which is used in wellbore/well components, earthwork drilling, and fluid production, etc., and can solve problems that cannot be solved by conventional acidification.

Active Publication Date: 2015-05-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a compound acid deep acidification plugging removal technology to solve the problems that cannot be solved by conventional acidification

Method used

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  • Oxidizing composite acid deep acidizing plugging removal method used for acidizing plugging removal of water injection well
  • Oxidizing composite acid deep acidizing plugging removal method used for acidizing plugging removal of water injection well
  • Oxidizing composite acid deep acidizing plugging removal method used for acidizing plugging removal of water injection well

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The specific implementation process steps of the high-pressure under-injection well treatment technology in this embodiment are as follows:

[0053] (1) Preparation of active water

[0054] Table 1 Active water composition table (m 3 )

[0055] name

Weight percent (wt%)

Mass(Kg)

OP-10

5

250

[0056] (2) Prepare the main component acid solution

[0057] Based on the weight of the main component acid solution as 100%, 14wt% of hydrochloric acid, 5wt% of acetic acid, 2wt% of hydrofluoric acid, 3wt% of iron ion stabilizer, 2wt% of ethylene glycol monobutyl ether, and 10.2wt of comprehensive plugging remover %, 2wt% of imidazoline corrosion inhibitor, 6.3wt% of the first main body deblocking agent, and the rest of the water are mixed and stirred to prepare the main component acid solution, the components of the main component acid solution and their weight percentages See Table 2 for quality and quality.

[0058] Table 2 Main compo...

Embodiment 2

[0089] The oxidative compound acid deep acidification plugging removal method of the present invention is also used in Fang 162-185 and Yao 1-20 wells, and the effects before and after the implementation are shown in Table 7:

[0090] Table Qifang 162-185, Yao 1-20 well deep acidification measures effect statistics table

[0091]

[0092] The unit of pressure in the table is MPa, and the unit of water injection volume is m 3 .

[0093] According to the statistical data in Table 7, it can also be found that the method of the present invention has an obvious effect of reducing pressure and increasing injection.

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Abstract

The invention provides an oxidizing composite acid deep acidizing plugging removal method used for acidizing plugging removal of a water injection well. The method includes the steps that active water, acid plugging removal agent liquid and body component acid liquor are sequentially injected to the water injection well to be subjected to plugging removal; then, two cement trucks are used for simultaneously injecting oxidizing plugging removal agent liquid and acid plugging removal agent liquid into the water injection well to be subjected to plugging removal, then, displacement liquid is injected in, the well is closed, and a reaction lasts for 10-18 hours. The method has the advantages that the plugging removal radius is large, formation contamination is small and the injection increase effect is good.

Description

technical field [0001] The invention relates to a treatment technology for high-pressure under-injection wells, in particular to an oxidative compound acid deep acidification and plugging removal method for acidification and plugging removal of water injection wells. Background technique [0002] In recent years, the acidizing enhanced injection technology has been playing an important role in the stimulation of under-injection layers in oilfields, but it also has certain limitations. For example, at present, the average porosity of the Chang 8 reservoir in Block Chi 46 of Youfangzhuang Oilfield is 12.02%, and the average permeability is 1.31mD. The average porosity of the Chang 8 reservoir in the Chi 97 block is 8.13%, and the average permeability is 0.26mD, which is an ultra-low-ultra-low permeability reservoir. The reservoir rocks are all lithic feldspathic sandstone, and the reservoir pore combination types are all dissolution pores. During the long-term development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B43/22
CPCE21B43/162
Inventor 田育红景文杰冯立勇王登莲
Owner PETROCHINA CO LTD
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