Organic boron delay cross-linking plant adhesive breakdown fluid

A technology of delayed cross-linking and vegetable glue, applied in the field of fracturing fluid, can solve problems such as failure to meet oil field fracturing construction, lack of delayed cross-linking, and damage.

Inactive Publication Date: 2004-09-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional inorganic borate crosslinking agents do not have delayed crosslinking effect, poor temperature resistance (less than 93°C), high frictional resistance, while organic zirconium and organic titanium crosslinking agents are difficult to break and cause serious damage.
Conventional organoboron cross-linking agents do not have adjustable delayed cross-linking time and cannot meet the needs of oilfield fracturing operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 500ml of water and place it in a mixer with a volume of 1000ml, add 10g of potassium chloride, 0.4g of sodium bicarbonate, and 1.0ml of fungicide in sequence, stir for 2 minutes to dissolve, then slowly add 3.0g of guar gum, stir for 5 minutes to dissolve and increase the viscosity, Then add 0.6g of sodium carbonate and 1.0ml of drainage aid, stir evenly, and let it stand for 4-6 hours to prepare the base liquid for later use. Mix components A and B of the organoboron crosslinking agent at a ratio of 100:8, then add 1.0% ammonium persulfate, and dissolve to prepare an organoboron crosslinking solution. Take 100ml of base fluid, add 0.4ml of cross-linking fluid, and record the time from adding the cross-linking fluid to forming a jelly as the cross-linking time of the fracturing fluid. Using a wide range of pH test paper, the pH value of the base fluid is 10.0, the pH value of the cross-linked fracturing fluid is 9.5, and the delayed cross-linking time is 1'42", usi...

Embodiment 2

[0021] Take 500ml of water and place it in a mixer with a capacity of 1000ml, add 10g of potassium chloride, 0.4g of sodium bicarbonate, and 1.0ml of fungicide in sequence, stir for 2 minutes to dissolve, then slowly add 3.0g of hydroxypropyl guar gum, stir for 5 minutes to dissolve To increase viscosity, add 0.6g sodium carbonate, 0.25g sodium hydroxide and 1.0ml drainage aid respectively, stir evenly, let stand for 4-6 hours, and make base liquid for later use. Mix components A and B of the organoboron crosslinking agent at a ratio of 100:12, then add 0.8% ammonium persulfate, and dissolve to prepare an organoboron crosslinking solution. Take 100ml of base fluid, add 0.4ml of cross-linking fluid, and record the time from adding the cross-linking fluid to forming a jelly as the cross-linking time of the fracturing fluid. Using a wide range of pH test paper, the measured pH value of the base fluid is 12.0, the pH value of the cross-linked fracturing fluid is 11.0, and the dela...

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Abstract

The invention relates to a novel organic boron cross linking agent for fracturing and fracturing fluid for deferring cross bonding vegetable glue, wherein the preparation method comprises the steps of, reacting sodium borate with multicomponent aldehydes (e.g. ethanedial), adding polyvalent alcohol amine (e.g. triethanolamine) for complete reaction, forming component an of organic boron cross linking agent, and organic boron component B of 20-30% caustic soda liquor solution, mixing component an and B in the proportion of 100:5-100:15 to form the organic boron cross linking agent. While the organic boron deferring cross bonding vegetable glue fracturing fluid comprises vegetable glue polymer, pH regulator, glue breaking agent and organic boron cross linking agent.

Description

[0001] Involved areas [0002] The invention relates to a novel organic boron cross-linking agent and delayed cross-linking vegetable gum fracturing fluid for oil field fracturing. Background technique [0003] At present, water-based fracturing fluids are commonly used in oilfield fracturing stimulation. However, conventional inorganic borate crosslinking agents do not have delayed crosslinking effect, poor temperature resistance (less than 93°C), and high frictional resistance, while organic zirconium and organic titanium crosslinking agents are difficult to break and cause serious damage. Conventional organoboron crosslinking agents do not have adjustable delayed crosslinking time and cannot meet the needs of oilfield fracturing operations. Contents of the invention [0004] The object of the present invention is to address the deficiencies of the prior art, and provide an organoboron crosslinking agent and an organoboron crosslinking plant gum fracturing fluid system th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 卢拥军舒玉华杜长虹丁云宏汪永利陈彦东杨艳丽杨振周曾斌
Owner PETROCHINA CO LTD
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