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A kind of microcapsule guar gum and preparation method thereof

A technology of guar gum and microcapsules, applied in chemical instruments and methods, compositions of drilling holes, etc., can solve the problems of caking and fish eyes, limited strength of jelly, inability to effectively block cracks and karst caves, etc. To achieve the effect of optimizing bonding strength, improving gel strength and good coating effect

Active Publication Date: 2015-08-19
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the concentration of guar gum is too high, there will be agglomeration and fish eyes during the preparation process, so there is a limit to increasing the concentration of guar gum preparation, generally no more than 1%.
Therefore, the formed jelly has limited strength and cannot effectively seal the cracks and caves in the formation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Measure 90mL and 10mL kerosene respectively, add 50g guar gum a (Tianjin COSL Chemical Company, food grade imported from India, particle size less than 200 mesh, the same below) into 90mL kerosene, and form guar gum after fully stirring - Kerosene dispersion system; add 0.33g C5 petroleum resin (Kunlun RKA1090, softening point 90°C) to 10mL kerosene, stir and dissolve to form a C5 petroleum resin-kerosene solution;

[0029] (2) Weigh 1.0g of sodium hydroxide and dissolve it in 20mL of water. Then add the sodium hydroxide solution to the dispersion system of guar gum-kerosene, stir well, and alkalize at 40°C for 1.5h;

[0030] (3) Slowly add the C5 petroleum resin-kerosene solution into the dispersion system of guar gum-kerosene under the condition of constant temperature stirring at 40°C, and stir at constant temperature at 40°C for 1 hour;

[0031] (4) Stop heating and stirring, suction filter, and dry at 60° C. to obtain a powder sample, which is microcapsule gua...

Embodiment 2

[0033] (1) Measure 90mL and 10mL of n-hexane respectively, add 50g of guar gum a to 90mL of n-hexane, and form a dispersion system of guar gum-n-hexane after fully stirring; add 0.5g of C5 petroleum resin in 10mL of n-hexane (Kunlun RKA1100, softening point 100°C), fully stirred and dissolved to form a C5 petroleum resin-n-hexane solution;

[0034] (2) Weigh 5.0g of sodium hydroxide and dissolve it in 20mL of water. Then add the sodium hydroxide solution into the dispersion system of guar gum-n-hexane, fully stir, and alkalize at 40°C for 1.5h;

[0035] (3) After heating to 40°C and stirring at a constant temperature, slowly add the solution of C5 petroleum resin-n-hexane to the dispersion system of guar gum-n-hexane, and stir at a constant temperature of 40°C for 1.5 hours;

[0036] (4) Stop heating and stirring, filter with suction, and dry at 60° C. to obtain a powder sample, which is microcapsule guar gum B.

Embodiment 3

[0038] (1) Measure 90mL and 10mL ethanol respectively, add 40g guar gum a in 90mL ethanol, form the dispersion system of guar gum-ethanol after fully stirring; Add 0.35g C5 petroleum resin (Kunlun RKA1100, Softening point 100 ℃), fully stirred and dissolved to form a C5 petroleum resin-ethanol solution;

[0039] (2) Weigh 0.4g of sodium hydroxide and dissolve it in 16mL of water. Then add the sodium hydroxide solution into the guar gum-ethanol dispersion system, stir well, and alkalize at 40°C for 1 hour;

[0040] (3) Slowly add the solution of C5 petroleum resin-ethanol into the dispersion system of guar gum-ethanol under the condition of constant temperature stirring at 40°C, and stir at constant temperature at 40°C for 1 hour;

[0041] (4) Stop heating and stirring, filter with suction, and dry at 70° C. to obtain a powder sample, which is microcapsule guar gum C.

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Abstract

The invention provides microcapsule guar gum which comprises guar gum and C5 petroleum resin coating the guar gum. The invention further provides a preparation method of the microcapsule guar gum. According to the embodiment of the application, the guar gum is coated with the C5 petroleum resin, so that the microencapsulation of the guar gum is achieved, a use concentration of the guar gum is increased under the condition that the guarant viscosity is not increased, the microcapsule guar gum with a very high concentration can be pumped over, the gum strength of the guar gum can be improved greatly, and cracks and solution caves of strata can be blocked off well.

Description

technical field [0001] The invention relates to a microcapsule guar gum and a preparation method thereof. Background technique [0002] In the process of oil drilling, it takes a lot of money, manpower and time to deal with the leakage of fractures and caves. For the plugging treatment of reservoirs, a variety of polymer gel temporary plugging agents have been developed at home and abroad. However, these gel temporary plugging agents either failed to plug leakage due to low strength, or caused great damage to the reservoir due to incomplete degradation, and so far have not been able to make breakthroughs. [0003] Guar gum has good biodegradability and is widely used in reservoir drilling and fracturing construction. By improving the gel strength of these guar gums, the purpose of sealing fractures and karst caves can be achieved without causing great damage to the reservoir. The method for improving the strength of guar gum includes: increasing the use concentration of g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/44
Inventor 赵志强苗海龙李自立耿铁徐博韬陈缘博
Owner CHINA NAT OFFSHORE OIL CORP
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