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Usage of cationic galactomannan

A galactomannan, a natural technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as unsatisfactory degradation of environmentally friendly RPM

Inactive Publication Date: 2009-12-16
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing relative permeability modifiers (RPM) are unsatisfactory both in performance and preparation cost, and in environmental protection (existing RPM is difficult to degrade).

Method used

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  • Usage of cationic galactomannan
  • Usage of cationic galactomannan
  • Usage of cationic galactomannan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of cationic guar gum:

[0033] Disperse 20 g of guar gum in 100 mL of 85 v / v% isopropanol aqueous solution, stir for 30 minutes, and mix well; add aqueous sodium hydroxide solution to make the pH of the system = 7. Add 20 g of 3-chloro-2-hydroxypropyl-trimethylammonium chloride dropwise, and drop it in 15-30 minutes; stir for 15 minutes. Add 50v / v% aqueous sodium hydroxide solution dropwise to adjust the pH value of the system to 8. Heat the system to 60°C-70°C and react for 2-3 hours. Stop the reaction and adjust the system to be neutral with acetic acid. After filtering, the resulting filter cake was washed with ethanol and water respectively, dried and ground to obtain the light yellow powder target (cationic guar gum).

[0034] (2) Water resistance of cationic guar gum solution:

[0035] Accurately weigh 30g of quartz sand (20-40 mesh) and put it into a 100mL alkaline burette. At 20°C, measure the time for 20mL of pure water to flow through the s...

Embodiment 2

[0047] Preparation and water-blocking properties of degraded cationic guar gum

[0048] (1) Preparation of degraded cationic guar gum:

[0049] (1-1) Preparation of degraded guar gum:

[0050] Take 25 grams of guar gum powder, measure 200mL of 95v / v% ethanol, and pour it into a 500mL three-neck flask; after mixing evenly, place the flask in a constant temperature water bath at 65°C, stir and keep the temperature for 10 minutes. Then add hydrochloric acid, make the concentration of hydrochloric acid in the system reach 0.2mol / L, and start the degradation reaction. After reacting for 0.5 hour, NaOH was added to adjust the reaction system to be neutral. Filter and wash the filter cake with ethanol and water respectively, and dry the filter cake to obtain degraded guar gum.

[0051] (1-2) Preparation of cationic degraded guar gum:

[0052] Disperse 20 g of the degraded guar gum obtained in step (1-1) in 100 mL of 85 v / v% isopropanol aqueous solution, stir for 30 minutes, and m...

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Abstract

The invention relates to an application of a natural galactomannan, in particular to a petrochemical application of a natural galactomannan modified by quaternary ammonium salt (comprising guar gum, fenugreek gum or locust bean gum or degradation products thereof) as a relative permeability regulator. The invention provides a new application of the natural galactomannan, thereby widening the application fields of the natural galactomannan and also overcoming the disadvantages of the existing relative permeability regulators (RPM), such as complicated preparation, environmental pollution, etc.

Description

technical field [0001] The present invention relates to the use of a kind of natural galactomannan, in particular to a new use of natural galactomannan (cationic galactomannan) modified by quaternary ammonium salt. Background technique [0002] In recent years, relative permeability modifiers (Relative permeability modifiers RPM) have become a research hotspot in order to enhance the recovery of water-bearing oil and gas reservoirs (selectively enhance oil recovery and prevent water production). [0003] The reported relative permeability modifier (RPM) mainly contains polyacrylamide polymers (Journal of PetroleumScience and Engineering, 2004, 45: 233-245 & Larry Eoff, E.Dwyann Dalrymple, B.R.Reddy, etal.Structure and Process Optimization for the Use of a Polymeric Relative-Permeability Modifier inConformance Control.SPE 64985) and brush polymer (brush polymer) (Gustavo Nieves, JennyFernandez, Leopoldo Sierra, et al.Field Application of relative permeability modifier in Vene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08B37/00
Inventor 方波卢拥军程巍邱晓慧浦柳花王丽伟崔明月陈彦东胥云丁云宏杨振周
Owner EAST CHINA UNIV OF SCI & TECH
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