Alkenyl succinic anhydride-modified guar gum fracturing liquid thickening agent and preparation method thereof

An alkenyl succinic anhydride, guar gum fracturing fluid technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as difficult product quality control, high production equipment requirements, potential safety hazards, etc. The effect of product quality control, secondary damage reduction and comprehensive performance improvement

Inactive Publication Date: 2011-09-14
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of alkenyl succinic anhydride modified guar gum fracturing fluid thickener and its preparation method, to overco

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, a kind of alkenyl succinic anhydride modified guar gum fracturing fluid thickener, first put 100g of guar gum powder and 15g of tetradecenyl succinic anhydride into a beaker and stir evenly, then mix 20g of salt The solution is sprayed into it, and the saline solution contains 2 g of sodium carbonate and 1 g of sodium chloride. After stirring evenly, raise the temperature of the system to 60° C. in a closed state and keep the temperature constant for 2 hours. Finally, 100 g of ethanol was added to the obtained product for washing to obtain alkenyl succinic anhydride modified guar gum fracturing fluid thickener.

[0020] The obtained guar gum modified by alkenyl succinic anhydride, after use, the residue content is reduced by 20%, and the surface tension of the gel breaking solution is reduced to 29mN / m.

Embodiment 2

[0021] Embodiment 2, a kind of alkenyl succinic anhydride modified guar gum fracturing fluid thickener, first put 100 g of guar gum powder and 10 g of docosyl succinic anhydride into a beaker and stir evenly, then mix 25 g Salt solution is sprayed therein, and comprises sodium carbonate 2.5g and sodium chloride 1.25g in the salt solution. After stirring evenly, the temperature of the system was raised to 40°C in a closed state, and the temperature was kept constant for 3 hours. Finally, add 150 g of methanol to the resulting product for washing to obtain alkenyl succinic anhydride modified guar gum fracturing fluid thickener.

[0022] The obtained guar gum modified by alkenyl succinic anhydride, after use, the residue content is reduced by 30%, and the surface tension of the gel breaking solution is reduced to 28mN / m.

Embodiment 3

[0023] Embodiment 3, a kind of alkenyl succinic anhydride modified guar gum fracturing fluid thickener, first put 100 g of guar gum powder and 12 g of octadecenyl succinic anhydride into a beaker and stir evenly, then mix 22 g Salt solution is sprayed therein, and contains sodium carbonate 2.2g and sodium chloride 1.1g in the salt solution. After stirring evenly, the temperature of the system was raised to 50° C. in a closed state, and the temperature was kept constant for 4 hours. Finally, 130 g of isopropanol was added to the resulting product for washing to obtain alkenyl succinic anhydride modified guar gum fracturing fluid thickener.

[0024] The obtained guar gum modified by alkenyl succinic anhydride, after use, the residue content was reduced by 28%, and the surface tension of the gel breaking solution was reduced to 29.6mN / m.

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Abstract

The invention relates to an alkenyl succinic anhydride-modified guar gum fracturing liquid thickening agent and a preparation method thereof. The conventional epoxy propane for modified guar gum has low boiling point, the raw materials are not easily obtained, the reaction process is complex, and the quality of the product is not easily controlled. The preparation method of the alkenyl succinic anhydride-modified guar gum fracturing liquid thickening agent sequentially comprises the following steps of: mixing 100 grams of guar gum powder and 10 to 15 grams of alkenyl succinic anhydride uniformly; preparing salt solution containing 10 mass percent of sodium carbonate and 5 mass percent of sodium chloride; adding 20 to 25 grams of salt solution into the mixture of the guar gum and the alkenyl succinic anhydride with stirring by a spraying method, and performing constant-temperature closed reaction for 2 to 4 hours at the temperature of between 40 and 60 DEG C; and washing the reaction product by using 100 to 150 grams of alcohol after the reaction is finished, and drying the reaction product. The residue content of the gum breaking liquid is low, secondary damage to the stratum is reduced, and the fracturing construction effect is promoted.

Description

[0001] An alkenyl succinic anhydride modified guar gum fracturing fluid thickener and a preparation method thereof. technical field [0002] The invention belongs to the field of oilfield chemical preparation technology, in particular to an oilfield fracturing technology, in particular to an alkenyl succinic anhydride modified guar gum fracturing fluid thickener and a preparation method thereof. Background technique [0003] In the middle and late stages of oilfield development, hydraulic fracturing of subsurface formations is a known method of increasing the permeability of subsurface formations while recovering petroleum product substances, and is one of the most effective production stimulation measures. Due to the low porosity and permeability of the rock formation, it cannot be put into production without fracturing. In this method, a viscous liquid fracturing fluid is poured into the wellbore and pressure is applied to cause the fracture. The proppant in the fluid keeps...

Claims

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Application Information

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IPC IPC(8): C08B37/00C09K8/68
Inventor 杨晓武沈一丁薛贝李培枝隋明炜
Owner SHAANXI UNIV OF SCI & TECH
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