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Graft modified xanthan gum and its preparation method and application

A technology of graft modification and xanthan gum, which is applied in the chemical field, can solve problems such as application field limitations and high temperature resistance performance requirements, and achieve the goals of increasing apparent viscosity, increasing low-shear viscosity, and improving rock-carrying cleaning ability Effect

Inactive Publication Date: 2021-08-03
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many studies on the graft modification of xanthan gum have been reported, and the grafted products are used for metal ions (Cu 2+ 、Cr 3+ , Pb 2+ ) adsorption, superabsorbent resin preparation, sand fixation and dust suppression, food additives, drug delivery, dyes, etc., are limited by the application field. The above application of grafted xanthan gum does not put forward requirements on the high temperature resistance of the product

Method used

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  • Graft modified xanthan gum and its preparation method and application
  • Graft modified xanthan gum and its preparation method and application
  • Graft modified xanthan gum and its preparation method and application

Examples

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preparation example Construction

[0037] Preparation of High Temperature Resistant Microbubble Drilling Fluid

[0038] Add 0.2-0.4% sodium carbonate to 3-5L of water, stir at a speed of 500-650rpm for 10 minutes, then slowly add bentonite with an aqueous solution of 3-5% in mass, continue stirring for 2 hours, and let stand for 16 hours to obtain Drilling fluid base slurry.

[0039] Take 300-400mL of bentonite base slurry and place it in a high-speed mixing cup, and add 0.5%-2% of powdered modified product xanthan gum-g-AA / AM / AMPS while stirring at a speed of 5000-10000rpm, and stir for 20 minute.

[0040] Turn on the high-speed stirring device, while continuing to stir the slurry at a speed of 10000-12000rpm, weigh and add foaming agent sodium dodecylsulfonate with a mass of 0.1-0.3% of the base slurry, and continue stirring for 2-5 minutes to obtain a resistant High temperature micro-bubble drilling fluid.

Embodiment 1

[0042] Embodiment 1: the preparation of graft product xanthan gum-g-AA / AM / AMPS

[0043] Weigh 7.5g each of AA, AM, and AMPS and dissolve them in 45mL of deionized water and stir evenly. Weigh 8.6g of sodium hydroxide and dissolve them in 5mL of deionized water and stir evenly. Use a plastic dropper to slowly add the sodium hydroxide solution dropwise to monomer solution until the pH of the monomer solution is adjusted to 7-8. The prepared solution was poured into a three-necked flask, and the three-necked flask was clamped on the reaction device, and the solution was heated and stirred at 50° C. and 250 rpm for 30 minutes, during which nitrogen gas was continuously introduced. After 30 minutes, 0.06 g of ammonium persulfate, 0.02 g of sodium bisulfite, and 1 g of xanthan gum were added in sequence, and the reaction product was taken out after the reaction was continued for 2 hours. The reaction product was dried at 65° C. for 48 hours and then pulverized to obtain xanthan gum...

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Abstract

The invention provides graft modified xanthan gum and its preparation method and application in high-temperature micro-bubble drilling fluid. The method for preparing graft modified xanthan gum comprises: adding acrylic acid (AA), acrylamide (AM) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) to water, acrylic acid (AA), acrylamide ( AM) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) is the first mass, stirring and dissolving, adjusting the pH of the solution to 7-8, heating to 45-55 ° C, stirring and passing through inert Gas for the first time; add the second mass of reducing agent, the third mass of oxidant, and the fourth mass of xanthan gum, keep the temperature of 45-55 ° C, stir and feed inert gas, and continue for the second time to obtain Graft modified xanthan gum.

Description

technical field [0001] The invention relates to the field of chemistry, and more specifically, relates to graft modified xanthan gum, a preparation method thereof, and an application in high-temperature microfoam drilling fluid. Background technique [0002] Drilling in depleted reservoirs presents many challenges as conventional oil and gas reserves dwindle. In recent years, a near-balanced drilling technology using microbubble drilling fluid has effectively solved the problems of differential pressure sticking, severe leakage, and reservoir damage in the drilling of depleted oil and gas reservoirs and other low-pressure areas. Microbubble drilling fluid is a kind of gas drilling fluid containing microbubbles with a particle size of 10-100 μm, which is prepared by high-speed stirring of surfactants and biopolymers. The technology mainly has the following advantages: (1) It has extremely high low-shear viscosity, which is beneficial to carry cuttings and clean the wellbore;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/58C09K8/38
CPCC08F251/00C09K8/38C08F220/06C08F220/56
Inventor 朱文茜郑秀华
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)