Composite retarded acid

A technology of retarded acid and hydrochloric acid, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of oil well pipe string corrosion, formation collapse, and reduce the service life of oil and casing, and achieve the goal of preventing reservoir damage Effect

Active Publication Date: 2010-10-20
SUNCOO PETROLEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in order to improve the ultimate recovery of oilfields, many production increase measures are taken in the development, among which acidizing is one of the main production increasing measures. This method is feasible, but different acidizing processes have different effects an

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A compound retarded acid, the mass parts of its raw material components are: 10 parts of hydrochloric acid, 4 parts of hydrofluoric acid, 4 parts of phosphoric acid, 3 parts of citric acid, 3 parts of methanol, 3 parts of demulsifier, 8 parts of acidification corrosion inhibitor , 65 parts of water.

[0017] The preparation method of the present embodiment is as follows: 10 parts of hydrochloric acid, 4 parts of hydrofluoric acid, 4 parts of phosphoric acid, 3 parts of citric acid, 3 parts of methanol, 3 parts of demulsifier, 8 parts of acidifying corrosion inhibitor and 65 parts of water Parts were fully stirred for 30 minutes at a temperature of 20 degrees to obtain a composite tartaric acid.

Embodiment 2

[0019] A compound retarded acid, the mass parts of its raw material components are: 20 parts of hydrochloric acid, 5 parts of hydrofluoric acid, 5 parts of phosphoric acid, 3 parts of citric acid, 10 parts of methanol, 1 part of mutual solvent, 0.5 parts of demulsifier, acidifying 10 parts of corrosion inhibitor, 45.5 parts of water.

[0020] The preparation method of this embodiment is as follows: 20 parts of hydrochloric acid, 5 parts of hydrofluoric acid, 5 parts of phosphoric acid, 3 parts of citric acid, 10 parts of methanol, 1 part of mutual solvent, 0.5 parts of demulsifier, acidification corrosion inhibitor 10 parts and 45.5 parts of water were fully stirred at a temperature of 22 degrees for 28 minutes to obtain a composite tartaric acid.

Embodiment 3

[0022] A compound retarded acid, the mass parts of its raw material components are: 30 parts of hydrochloric acid, 5 parts of hydrofluoric acid, 5 parts of phosphoric acid, 5 parts of citric acid, 2 parts of mutual solvent, 1 part of demulsifier, 15 parts of acidification corrosion inhibitor parts, 37 parts of water.

[0023] The preparation method of this embodiment is as follows: 30 parts of hydrochloric acid, 5 parts of hydrofluoric acid, 5 parts of phosphoric acid, 5 parts of citric acid, 2 parts of mutual solvent, 1 part of demulsifier, 15 parts of acidifying corrosion inhibitor and water 37 parts were fully stirred for 26 minutes at a temperature of 24 degrees to obtain a composite tartaric acid.

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PUM

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Abstract

The invention relates to a composite retarded acid for carrying out acidification on an oil-water well in the oil-field development, which comprises the following raw material components in part by mass: 10 to 40 parts of hydrochloric acid, 2 to 10 parts of hydrofluoric acid, 2 to 10 parts of phosphoric acid, 2 to 6 parts of citric acid, 0 to 10 parts of methyl alcohol, 0 to 5 parts of mutual solvent, 0.5 to 5 parts of demulsifying agent, 5 to 15 parts of acidizing corrosion inhibitor and 30 to 70 parts of water. The composite retarded acid of the invention realizes low damage or no damage inthe acidification process and improves the intrinsic permeability of an acidification band furthest.

Description

technical field [0001] The invention relates to a raw material component of a composite retarded acid used for acidizing oil-water wells in oil field development. Background technique [0002] At present, in order to improve the ultimate recovery of oilfields, many production increase measures are taken in the development, among which acidizing is one of the main production increasing measures. This method is feasible, but different acidizing processes have different effects and also have different defects, such as simple Soil acid acidification has a certain effect of increasing production, but the corrosion of the oil well string is relatively large, which reduces the service life of the oil casing, causes collapse of the formation, and causes old formation blockage. At the same time, while acidizing improves reservoir permeability by dissolving formation rock minerals and plugging substances, it also brings some new damages during the acidizing operation. Such as imprope...

Claims

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Application Information

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IPC IPC(8): C09K8/78
Inventor 屈展陈军斌王俊奇盖海防
Owner SUNCOO PETROLEUM TECH
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