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Variable-viscosity acid liquid used for acidifying processing

A technology of viscous acid and acidizing corrosion inhibitor, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temperature resistance and poor self-steering ability, achieve good temperature resistance and promote uniformity The effect of distribution

Inactive Publication Date: 2015-04-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned existing technologies all have defects such as poor self-steering ability and poor temperature resistance effect.

Method used

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  • Variable-viscosity acid liquid used for acidifying processing
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  • Variable-viscosity acid liquid used for acidifying processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of the viscosifying agent erucamidopropyl betaine.

[0031] Add 10 g of N,N-dimethylaminopropylamine, 11 g of erucic acid, and 0.1 g of catalyst KOH into a three-necked flask, the reaction temperature is 130° C., and the reaction time is 2 hours. After the reaction is finished, reduce the pressure and evacuate to 8-12kPa, and distill off excess dimethylaminopropylamine to obtain the intermediate product erucic acid amido tertiary amine. Take the intermediate product erucic acid amido tertiary amine and put it into a three-necked flask, add a mixed solvent, raise the temperature to the set temperature, then add aqueous sodium chloroacetate, stir and reflux, react at 60-90°C for 6-9 hours, and obtain a yellow to brown viscous liquid , after post-treatment is erucamide propyl betaine solid.

Embodiment 2

[0033] 1. Preparation of viscous acid solution: use hydrochloric acid, hydrofluoric acid, viscosifier, acidification corrosion inhibitor, iron ion stabilizer, demulsification aid, clay stabilizer and water to prepare viscous acid solution, viscous acid The weight percentage of each component in the liquid is as shown in Table 1 below:

[0034] Table 1 Embodiment 1 formula

[0035]

[0036] 2. During construction, inject pre-fluid, main acid, and displacement fluid into the formation in sequence according to the construction design.

[0037] 3. After the construction is completed, flow back according to the construction design.

Embodiment 3

[0039] 1. Preparation of viscous acid solution: use hydrochloric acid, hydrofluoric acid, viscosifier, acidification corrosion inhibitor, iron ion stabilizer, demulsification aid, clay stabilizer and water to prepare viscous acid solution, viscous acid The weight percentages of each component in the liquid are as shown in Table 2 below:

[0040] Table 2 Example 2 formula

[0041] Drug name

Mass (tons)

HCl

25.0

Erucamidopropyl Betaine

5.0

HF

2.5

HSJ-2 acidification corrosion inhibitor

1.0

[0042] Iron ion stabilizer for WC-1 acidification

1.0

DL-6 Broken L Drainage Aid

0.3

COP-1 clay stabilizer

1.0

Diethylene glycol butyl ether

2.0

water

62.2

[0043] 2. According to the construction design, inject the pre-fluid, main acid, and replacement fluid into the bottom layer in sequence during construction.

[0044] 3. After the construction is completed, ...

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PUM

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Abstract

A variable-viscosity acid liquid is composed of the following compositions in percent by weight: 19.9-25.0% of hydrochloric acid, 1.0-7.5% of hydrofluoric acid, 5-7% of a viscosity-changing agent, 1-2% of an acidifying corrosion inhibitor, 0.1-0.5% of an ferric-ion stabilizing agent, 0.3-0.4% of a demulsification cleanup additive, 1-1.5% of a clay stabilizing agent, 1-2% of an acidifying mutual solvent, and the balance water. The invention provides the variable-viscosity acid liquid, and the variable-viscosity acid liquid has self-diverting flow-dividing effect and is capable of realizing general acidifying and uniform acid distribution.

Description

technical field [0001] The invention relates to a viscous acid liquid used for acidizing treatment, which belongs to the field of oil field chemistry. Background technique [0002] During the drilling and completion of horizontal wells, the drilling fluid and completion fluid will inevitably contact the oil and gas layers for a long time and in a large area. The pollution zone increases the seepage resistance of the fluid in the formation, causing the oil layer to suffer more serious damage than the vertical well. Therefore, the purpose of horizontal well acidizing is to decontaminate the formation near the wellbore, mainly drilling mud, and restore the productivity of the horizontal well; [0003] In the specific acidizing process, acid solution placement is one of the key technologies for the success of acidizing construction. Therefore, in matrix acidizing, in order to achieve the expected goals of removing pollution near the wellbore, expanding oil flow channels in low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/74
CPCC09K8/52C09K8/74C09K2208/12C09K2208/32
Inventor 刘善祥王永清李海涛
Owner SOUTHWEST PETROLEUM UNIV
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