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Retarding acidification system

A retarded acid and system technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of short acid penetration distance, fast reaction rate of acid rock, etc., and achieve deep penetration distance, low viscosity, The effect of good dissolution ability

Inactive Publication Date: 2016-06-08
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the conventional acidizing construction, due to the fast reaction rate of the acid rock and the short penetration distance of the acid, it can only eliminate the damage near the wellbore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Add an appropriate amount of water into the three-necked flask, add diethylenetriamine, formaldehyde solution, and phosphorous acid into a 250mL three-necked flask at a molar ratio of 1:3:3, so that the total monomer concentration is 15%, and add hydrochloric acid to adjust the pH value to 1. Stir, react at a temperature of 110°C for 6h, cool to room temperature, and remove the solvent from the reaction solution with a rotary evaporator, set the temperature at 60°C and vacuum at 0.098MPa during evaporation to obtain a reddish-brown viscous liquid.

[0062] The molecular structure of the synthesized product was identified by infrared spectroscopy, and the infrared spectrum of the product was as follows figure 1 shown.

[0063] Depend on figure 1 It can be seen that v=3409cm -1 It is O-H in phosphorous acid, v=2920cm -1 and v = 2857cm -1 Symmetric and asymmetric stretching vibration peaks of methyl and methylene, v=1103cm -1 It is P=O stretching vibration, v=1621cm ...

Embodiment 2

[0065] Add an appropriate amount of water into the three-necked flask, add diethylenetriamine, formaldehyde solution, and phosphorous acid into a 250mL three-necked flask at a molar ratio of 1:5:5, so that the total monomer concentration is 20%, and add hydrochloric acid to adjust the pH value to 3. Stir, react at a temperature of 100°C for 7 hours, cool to room temperature, and remove the solvent from the reaction solution with a rotary evaporator, set the temperature at 60°C and vacuum at 0.098MPa during evaporation to obtain a reddish-brown viscous liquid.

Embodiment 3

[0067] Add an appropriate amount of water into the three-necked flask, add triethylenetetramine, formaldehyde solution, and phosphorous acid into a 250mL three-necked flask at a molar ratio of 1:7:7, so that the total monomer concentration is 20%, and add hydrochloric acid to adjust the pH value to 3. Stir, react at a temperature of 100°C for 7 hours, cool to room temperature, and remove the solvent from the reaction solution with a rotary evaporator, set the temperature at 60°C and vacuum at 0.098MPa during evaporation to obtain a reddish-brown viscous liquid.

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Abstract

The invention provides a retarding acidification system. The retarding acidification system comprises a retarding admixture, wherein the retarding admixture is synthesized through a Mannich reaction of polyethylene polyamine, formaldehyde and phosphorous acid. A multi-hydrogen acid retarding acidification system is adopted, and the molecular structure of the retarding acidification system comprises multiple phosphate groups which can provide multiple H<+>. Compared with other acidic solutions, the retarding acidification system has more excellent performance including more excellent retarding performance, longer penetration distance, lower clay corrosion rate, higher quartz corrosion rate and capability of inhibiting secondary precipitation and has the advantages of being good in corrosion inhibition and chelating property, low in viscosity and the like. The retarding acidification system further has better corrosion capability when acid liquor reaches the deep stratum, and further, the acidification effect of the high-retardancy acidification system is improved.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a retarded acid system. Background technique [0002] Acidizing is one of the important production stimulation measures for oil and gas reservoirs. It is a production stimulation measure that uses acid liquid to remove pollution near the bottom of production wells and injection wells, restore formation permeability or dissolve formation rock cement to increase formation permeability. Its purpose is to use acid to relieve the damage caused to the formation near the wellbore during the process of drilling, well completion, well workover and enhanced injection, and dredge the fluid seepage channel, so as to restore and increase the productivity of oil and gas wells. At present, according to the method and purpose of acidizing construction, the acidizing process can be divided into: pickling, matrix acidizing (also called pore acidizing) and fracturing acidizing. The reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K2208/12C09K2208/32
Inventor 全红平张治豪向文军崔艳艳李卓柯
Owner SOUTHWEST PETROLEUM UNIV
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