Environment-friendly acidizing working solution suitable for low-permeability carbonate reservoir and preparation method thereof

A carbonate rock reservoir, environment-friendly technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing engineering costs, corrosion of the end face of the well wall, corrosion of the well pipe, etc., to reduce the acidity Loss, Corrosion Reduction, Effect of Extending Response Time

Active Publication Date: 2020-04-14
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The direct use of conventional acid fluid in stimulation of low-permeability carbonate reservoirs may cause serious well pipe corrosion problems, and it is difficult to generate deeper wormholes, and it is easy to cause end face corrosion on the well wall, and the system Added corrosion inhibitors, iron ion stabilizers, etc. all increase the project cost

Method used

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  • Environment-friendly acidizing working solution suitable for low-permeability carbonate reservoir and preparation method thereof
  • Environment-friendly acidizing working solution suitable for low-permeability carbonate reservoir and preparation method thereof
  • Environment-friendly acidizing working solution suitable for low-permeability carbonate reservoir and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 1.5g of potassium chloride and 2g of ammonium chloride into 100mL of water, stir and dissolve fully to obtain a preposition; add 4g of glutamic acid N,N-diacetic acid, 3.5g of methylglycine diacetic acid, 4.5g of methanesulfonic acid and 6g of acetic acid were used to obtain an environment-friendly acidified working solution.

[0028] In Example 1, every 1 g is one serving.

Embodiment 2

[0030] Add 2g of potassium chloride and 2.5g of ammonium chloride into 100mL of water, stir and dissolve fully to obtain a preposition; add 4.5g of glutamic acid N,N-diacetic acid, 4g of methylglycine diacetic acid, 4g methanesulfonic acid and 8.5g acetic acid to obtain an environment-friendly acidified working solution.

[0031] In Example 2, every 1 g is one serving.

Embodiment 3

[0033] Add 2g of potassium chloride and 2g of ammonium chloride to 100mL of water, stir and dissolve fully to obtain a preposition; add 4.5g of glutamic acid N,N-diacetic acid, 4.5g of methylglycine diacetic acid, 3.5g of methanesulfonic acid and 5.5g of acetic acid to obtain an environment-friendly acidified working solution.

[0034] In Example 3, every 1 g is one serving.

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Abstract

The invention provides an environment-friendly acidizing working solution suitable for a low-permeability carbonate reservoir. The environment-friendly acidizing working solution is prepared from thefollowing raw materials in parts by mass: 100 parts of water, 3 to 5 parts of glutamic acid N, N-diacetic acid, 3 to 5 parts of methyl glycine diacetic acid, 3 to 5 parts of methyl sulfonic acid, 5 to10 parts of acetic acid, 1 to 3 parts of potassium chloride and 1 to 3 parts of ammonium chloride. The invention further provides a preparation method of the environment-friendly acidizing working solution. The environment-friendly acidizing working solution provided by the invention is suitable for acidizing a carbonate rock water well, can effectively increase the permeability of a carbonate rock reservoir, has a good corrosion inhibition effect on a metal pipe, and is environment-friendly and easy to degrade.

Description

technical field [0001] The invention relates to the technical field of chelating agents, in particular to an environment-friendly acidizing working fluid suitable for low-permeability carbonate rock reservoirs and a preparation method. Background technique [0002] As an important stimulation measure, matrix acidizing is easy to form a “high-speed channel” with superior seepage capacity—wormhole near the wellbore. It is mainly used for plugging removal near the wellbore to promote reservoir stimulation and production stimulation. [0003] In the acidizing operation of carbonate rock reservoirs, the conventional acidizing system has the disadvantages that the acid-rock reaction rate is too fast, it is difficult to form deep acid-etched wormholes, and it is easy to destroy the reservoir structure due to excessive acidification, which affects the reservoir production. The problems of low utilization efficiency and serious corrosion of drilling tools are caused. The chelating a...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 石彦平余浪陈书雅蔡记华
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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